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Accelerator Laboratory News

・Prof. Yoshitaka Kimura received the Order of the Sacred Treasure, Gold Rays with Neck Ribbon from Japanese Government (2016.12.14)
topics In the fall of 2016, Dr. Yoshitaka Kimura, Professor Emeritus of KEK, received the Order of the Sacred Treasure, Gold Rays with Neck Ribbon, from Japanese Government for his long term contribution in the field of education and research activities. ---more

・Prof. Yong Ho Chin Appointed to the Chair of ICFA Beam Dynamics Panel (2016.11.17)
topics Prof. Yong Ho Chin of KEK Accelerator Laboratory was appointed to the new Chair of ICFA (International Committee for Future Accelerators) Beam Dynamics Panel. This panel is one of committees under ICFA and it aims to encourage and promote international collaborations on beam dynamics studies for present and future accelerators. ---more

・The 3rd KEK Student Day held in KEK (2016.11.9)
topics The 3rd KEK Student Day was held on October 25, 2016 at KEK Tsukuba campus. This event provides an opportunity for all graduate students studying at KEK to meet once a year. KEK hosts over one hundred graduate students of various universities including those of SOKENDAI. Each student presented his/her research at oral and poster sessions, that were followed by a panel discussion session entitled "Research experiences in abroad," in which foreign students from Asian countries and Japanese students exchanged the experiences about their research and life. ---more

・Swedish delegation's visit to KEK (2016.10.17)
topics On October 5, 2016, a Swedish delegation, led by Prof. Viktor Öwall, Dean of the Faculty of Engineering, Lund University, visited the High Energy Accelerator Research Organization, KEK. The delegation also visited J-PARC on October 4, 2016. ---more

・The Prime Minister of the Republic of Slovenia visited KEK (2016.10.7)
topics On October 4, 2016, His Excellency Dr. Miro Cerar, Prime Minister of the Republic of Slovenia, and Her Excellency Ms. Simona Leskovar, Ambassador of the Republic of Slovenia to Japan, visited the High Energy Accelerator Research Organization, KEK. H. E. Dr. Cerar and his delegation were warmly welcomed by Director General (DG), Dr. Masanori Yamauchi, Executive Director Dr. Yasuhiro Okada, the KEK and Slovenian researchers working on Belle/Belle II experiments. ---more

・Visual Imaging of Radio-Frequency Cavity Breakdown (2016.10.5)
accloriginal Toward the phase 2 operation of the SuperKEKB project, the construction of the positron damping ring (DR) has entered its final stage. In 2013, we published an article on the completion of the first production version of the radio-frequency (RF) accelerating cavity for the SuperKEKB/DR. The present article introduces the results of a high-power test of the second production version of the cavity. ---more

(topics linked 2016.10.6)

・A visit from the United States Embassy of Tokyo (2015.9.16)
topics Mr. Jason P. Hyland, the Deputy Chief of Mission the United States Embassy of Tokyo visited the High Energy Accelerator Research Organization, KEK, on September 13, 2016 and met with Executive Director Dr. Yasuhiro Okada, KEK researchers and the United States researchers working on the Belle II Experiment. ---more

・KEK develops the KEK Project Implementation Plan (KEK-PIP) (2016.8.8)
topics KEK has developed the KEK Project Implementation Plan (KEK-PIP). The KEK-PIP is an implementation plan which clarifies the framework of budgeting and priority projects to advance the research programs set out in the KEK Roadmap. ---more

・The 21st meeting of the KEKB Accelerator Review Committee was held (2016.6.22)
accloriginal The 21st KEKB Accelerator Review Committee was held at Tsukuba campus from June 13 to 15. Present status of Phase 1 commissioning and status of preparation for Phase 2 and 3 were reported and discussed intensively. The committee members visited control room, ring tunnel, linac tunnel, dumping ring and QCS. ---more

・First turns and successful storage of beams in the SuperKEKB electron and positron rings (2016.3.3)
press On February 1, 2016, the High Energy Accelerator Research Organization (KEK) started test operation of the SuperKEKB electron-positron collider. This machine represents a major upgrade from the previous KEKB accelerator, and is the culmination of years of construction that started in the second half of 2010. On February 10, SuperKEKB succeeded in circulating and storing a positron beam in the positron ring, and on February 26, succeeded in circulating and storing an electron beam in the electron ring as well. ---more

・Trial operation of SuperKEKB started (2016.2.23)
topicsOn February 1st, 2016, an electron beam was successfully transferred from the linac to the entrance of the main ring of the SuperKEKB electron-positron collider at KEK. In the days that followed, a beam of positrons was also transferred to the entry point of the main ring.Trial operation requires the adjustment of more than 2000 magnets in the electron and positron rings that are situated around the 3.1 kilometer circumference of SuperKEKB. ---more

・TPS achieved the beam intensity of 520mA at NSRRC in Taiwan (2016.1.19)
accloriginal TPS (Taiwan Photon Source), a third generation light source accelerator at NSRRC (National Synchrotron Radiation Research Center), successfully achieved the beam intensity of 520 mA using a superconducting (SC) RF system of two KEKB-type SC-damped-cavities. The cavity has been developed under the close collaboration between the RF teams of KEK and NSRRC since 2010. This collaboration will be continued sharing the operation experience of both SuperKEKB and TPS, in order to establish the stable operation condition of SC-RF under the heavy beam loading. ---more
(topics linked 2016.1.20)

・KEK issues action plan for the International Linear Collider (2016.1.7)
topics Japan's High Energy Accelerator Research Organization (KEK) issued an KEK-ILC action plan for how KEK should start its preparation toward the International Linear Collider when the Ministry of Education, Culture, Sports, Science and Technology (MEXT), decides to initiate negotiations with foreign countries. ---more

・KEK and TRIUMF signed a new partnership agreement (2015.12.21)
topics On Friday, December 4, 2015, KEK and TRIUMF signed a new partnership agreement to establish mutual TRIUMF and KEK offices. A signing ceremony was held at the Canadian Embassy in Japan, in the presence of Ambassador of Canada to Japan, His Excellency Mr. Mackenzie Clugston; Ms. Susan Bincoletto, Assistant Deputy Minister, International Business Development, and Chief Trade Commissioner, Global Affairs Canada; Ms. Yayoi Komatsu, Director-General, Research Promotion Bureau of Japan's Ministry of Education, Culture, Sports, Science and Technology (MEXT). ---more

・The Indian Science and Technology Minister and the Ambassador of India visited KEK for 5 year extension of the Indian Beamline agreement (2015.11.20)
topics H.E. Dr. Harsh Vardhan, Hon'ble Union Minister for Science and Technology and Earth Science along with H.E. Smt. Deepa Gopalan Wadhwa, the Ambassador of India, Japan visited KEK on November 4, 2015. After a meeting with Dr. Masaharu Nomura, Executive Director of KEK and other executives to discuss ongoing cooperative activities in synchrotron radiation science and accelerator science, the signing ceremony for the five year extension of the Indian Beamline agreement was held in witness of Hon'ble Minister. ---more

・Pioneering BaBar and Belle joint analysis (2015.8.19)
press Almost all physical phenomena are the same for particles and their anti-particle partners - a property referred to as 'CP-symmetry'. CP violation occurs when this symmetry is broken so that nature behaves differently for particles and their anti-particle partners. CP violation has been observed in a small number of rare decays and a new case of CP violation has been reported in a first-ever joint data analysis with BaBar and Belle data. This joint analysis reveals the observation of CP violation in the two-body neutral B meson decays to neutral D meson and a light neutral meson for the first time. This analysis is the first attempt to utilize the data accumulated by two B-factories, BaBar and Belle experiments in a combined analysis that have, in the past, carried out independent measurements of CP violation in various B meson decays. To our knowledge, this is the first time competing particle physics experiments at different accelerators have combined their data in a single analysis prior to publication. ---more

・First look at antineutrino appearance from T2K (2015.7.28)
[IPNS Topics] Scientists of the T2K collaboration observe three candidate electron antineutrino events at Super-Kamiokande in the muon antineutrino beam from J-PARC ---more

・A visit from the German Embassy to Japan in Tokyo at KEK (2015.7.14)
topics Dr. Stefan Moebs, the Minister Counselor, and Dr. Andreas Kirchner, the Science Counselor, from the German Embassy to Japan in Tokyo visited the KEK high energy physics laboratory on Wednesday, June 24th, 2015 and met with Director General (D.G.) Prof. Masanori Yamauchi and German researchers working on the Belle II experiment. After a greeting from the D.G., Executive Director Prof. Yasuhiro Okada gave an overview of KEK. Prof. Christian Kiesling of the Max Planck Institute for Physics in Munich then gave the German ministers an introduction to particle physics and the Belle II experiment at KEK. ---more

・A visit from the Italian Ambassador to Japan at KEK (2015.7.1)
topics The Italian Ambassador in Tokyo, H.E. Domenico Giorgi, visited the KEK laboratory on Tuesday, June 23, and met with Director General Prof. Masanori Yamauchi. After the meeting, a Memorandum of Understanding between INFN and KEK was signed for the construction of the Belle II detector, which will be installed on the SuperKEKB accelerator. ---more

・Dr. Xudong Wang received the 2015 Encourage Prize of the Cryogenic and Superconductivity Society of Japan, CSSJ (2015.6.8)
accloriginal Dr. Xudong Wang in the KEK Accelerator Laboratory was awarded the 2015 Encourage Prize of CSSJ. The prizes is given to the researcher under 35 years old who belongs to CSSJ, and has the possibility of the remarkable contribution in the academic and technical fields of the cryogenic and superconductivity engineering, or actively presents the papers and the research talks in the journal and the conference of CSSJ. ---more

(topics linked 2015.6.11)

・Prof. E. Forest of KEK publishes a new textbook for beam dynamics (2015.4.2)
accloriginal Prof. E. Forest of KEK is publishing his new textbook "From Tracking Code to Analysis ---Generalised Courant-Snyder theory for realistic accelerator models—" for beam dynamics from Springer. ---more

・KEK Director General's Address (2015.4.1)
topicsParticle accelerator has played extremely important roles in progress of our understanding of nature, since its history started in 1930's. It has provided essential methodology to study nuclei, elementary particles, condensed matter and even life sciences. Also, role of particle accelerators is really outstanding in their industrial and medical applications. There is no doubt that progress of particle accelerators has substantially contributed to the modern science. Technologies of particle accelerators are still advancing rapidly, and drive frontier of science and applied research. ---more

・New Executive Board Members Started A Three-Year Term at KEK (2015.4.1)
press Fiscal year of KEK started on April 1, 2015, and a team of new management started their three-year term appointment this week. ---more

・The next Director of the Accelerator Laboratory determination (2014.12.25)
accloriginal On December 24, the Education and Research Council of KEK chose Seiya Yamaguchi as the next Director of the Accelerator Laboratory. ---more

・Prof. Yong Ho Chin received the 2015 APS Outstanding Referee Award (2014.12.9)
accloriginal Prof. Yong Ho Chin of KEK Accelerator Laboratory was selected as an Outstanding Referee of 2015 for the Physical Review and Physical Review Letters journals published by American Physical Society (APS). This program has started in 2008 to recognize outstanding referees who are helpful to advance and diffuse the knowledge of physics, while creating a resource for the physics community in the APS journals. About 150 scientists are selected in each year among more than world-wide 52,000 referees. ---more
(topics linked 2014.12.9)

・New International Offices of KEK and CERN (2014.11.25)
topics KEK and CERN have agreed to establish mutual offices at the respective labs: a CERN office at KEK and a KEK office at CERN, to facilitate and enhance common work on future accelerator projects and other related scientific projects of common interest. ---more

・KEK Openhouse 2014 to be held (2014.9.12)
Events KEK will be holding this year's openhouse.
The invitation is open to all the general public. Various facilities and research equipment will be on display. Lectures by leading scientists and gaming corners are prepared. ---more

・From ICFA:International committee looks toward a global future of particle physics discoveries (2014.7.25)
topicsA global strategy for particle physics is taking shape, one world region at a time. Featuring colliders that smash particles at higher energies than ever before, and gigantic experiments to study the smallest components of matter, this future will lead to breakthrough discoveries at facilities around the globe.
The International Committee for Future Accelerators (ICFA), an international body that facilitates international collaboration in the construction and use of particle accelerators for high-energy physics, has issued a statement that endorses the strategic plans for the future of high-energy physics in Europe, Asia and the United States. In parallel with efforts to globally pursue the study of neutrinos, ICFA has stated its continuing support of the International Linear Collider (ILC) and its encouragement of international studies of future circular colliders. ---more

・50 years from the Discovery of "CP-violation"
- Belle and Babar complete the Joint Book on their experimental work to prove the Kobayashi-Maskawa theory of CP-violation -
press Joint publication of Belle and BaBar has comleted last month. To celebrate this achivement, the first special editions of the book are presented to Drs. Cronin, Kobayashi and Maskawa at the conference held in London.
(Report from the Organizers of the conference, 50 YEARS OF CP VIOLATION) ---more

・Three researchers of ACCL have received Outstanding Referee Award since 2009 (2014.3.10)
accloriginal American Physical Society (APS) has started Outstanding Referee Program since 2008 to recognize scientists who have been exceptionally helpful in assessing manuscripts for publication in the APS journals. About 150 scientists are nominated in each year among more than 60,000 referees. At KEK Accelerator Laboratory (ACCL), Prof. Kazuhito Ohmi (2008), Prof. Kaoru Yokoya (2009), and Director Katsunobu Oide (2014) have been awarded so far. ---more

・Report on the Joint US-CERN-Japan-Russia Accelerator School 2013 (2013.12.9)
accloriginal The Joint US-CERN-Japan-Russia Accelerator School 2013 was held at the Fuji Institute of Education and Training which is located at the foot of Mt. Fuji, one of the world heritages, from October 23 to 31, 2013. The school welcomes more than 100 attendees from many countries of Asia, Europe and North America, and successfully completed. ---more
(topics linked 2013.12.9)

・Successful development of a 500-m-long laser-based fiducial line for high precision alignment of long-distance linear accelerators (2013.10.28)
press A research group led by Tsuyoshi Suwada, an associate professor at the High Energy Accelerator Research Organization (KEK), and Souichi Telada, a head researcher at the National Institute of Advanced Industrial Science and Technology (AIST) of Japan, has succeeded for the first time in developing a laser-based alignment system that allows a high precision alignment of a linear accelerator along a 500-m-long fiducial line. ---more

・Nobel Prize to F. Englert and P. Higgs (2013.10.21)
topicsThe Royal Swedish Academy of Science awarded the Nobel Prize in Physics to two theorists, François Englert of Université Libre de Bruxelles, Belgium, and Peter W. Higgs of the University of Edinburgh, UK, “ for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles and which was recently confirmed through the discovery of the predicted fundamental particle by the ATLAS and CMS experiments at CERN ’s Large Hadron Collider (LHC).” ---more

・Completion of the First Production Version of the Accelerating Cavity for the SuperKEKB Positron Damping Ring (2013.10.7)
accloriginal A positron damping-ring accelerator (hereinafter called the “DR”) is under construction to fulfill the requirement for the low-emittance positron-beam injection into the main ring of the SuperKEKB accelerator which is based on the nano-beam scheme. We have developed a radiofrequency (RF) accelerating cavity (hereinafter simply referred to as “the cavity”) for the DR. The cavity is an evacuated metal resonator, into which we input high-power RF waves to excite an electromagnetic mode with a high electric field to accelerate charged particles. We usually use copper to make such cavities because of its high electrical and thermal conductivities. The cavity in the present work is mainly made of high-purity oxygen-free copper (class1). In the following, we refer to this cavity as the “DR cavity.” ---more

・Successful Production of KEKB-type Superconducting Radio Frequency Modules for Taiwan Photon Source (2013.9.24)
accloriginal A new 3-GeV, 500-mA, synchrotron light source named Taiwan Photon Source (TPS) at National Synchrotron Radiation Research Centre (NSRRC) is now entering its final stage of construction with partial occupancy of accelerator components. The commissioning of a new concentric machine is scheduled for 2014 summer. ---more

・Statement from the Asian High Energy Physics Community on the International Linear Collider (2013.9.4)
topics Asia-Pacific High Energy Physics Panel (AsiaHEP) and Asian Committee for Future Accelerators (ACFA) have jointly issued a statement that the International Linear Collider (ILC) is the most promising electron positron collider to achieve the objectives of next-generation physics. ---more

・KEK Openhouse 2012 (2012.9.21)
The Openhouse was on September 2, and some 4,600 people visited.
The visitors were interested in the research activities and the facilities of KEK.

*web Album

・The Announcement of the Next Director of J-PARC Center (2012.6.22)
topicsWe are pleased to announce that Dr. IKEDA, Yujiro, who is one of the present J-PARC Deputy Directors, has been appointed as the next Director of J-PARC Center. This new appointment will be effective on the July 1, 2012 until March 31, 2015. ---more

・Successful High-Volume Production of Ultrahigh-Performance Magnetic Cores at J-PARC: Toward higher intensity acceleration as a sign of resurrection from the Great East Japan Earthquake of 2011 (2012.6.13)
pressThe Japan Proton Accelerator Research Complex (J-PARC), Tokai-mura, Ibaraki, resumed the development and production of large ultrahigh-performance metal magnetic cores for radio-frequency (RF) accelerating cavities,*3 which once had halted its operation due to the damage caused by the Great East Japan Earthquake of 2011, has succeeded the high-volume production of the cores after recovering from the damage. ---more

・First Beam Experiment by the Collaboration between 3 Nations: Japan, UK and USA (2011.06.23)
After 15 years of waiting the first tests of a novel Low Output Impedance (LOI) acceleration system with beam in the ISIS proton synchrotron at the Rutherford Appleton Laboratory (RAL), UK, were completed on April 17, 2011. The system was quite stable under high-intensity beam current, and the output impedance was measured to be as low as 35ohms, which is almost the design value and about 40 times lower than that in the existing acceleration systems. There is still much more work to do to make this system – or something like it – an operational part of a real synchrotron, but the initial results are very promising. This approach may point the way towards upgrades of existing accelerators and future high-intensity ones. ---more
(highlights linked 2011.06.23)

・Indication of Electron Neutrino Appearance at the T2K Experiment (2011.6.15)
pressTsukuba, Japan, June 15, 2011. The T2K experiment, whose primary purpose is to study neutrino interactions at a large distance from their source, has detected 6 electron neutrino candidate events based on the data collected before March 11, 2011. For the first time, it was possible to observe an indication that muon neutrinos are able to transform into electron neutrinos over a distance of 295 km through the quantum mechanical phenomena of neutrino flavor oscillations. ---more

・Shin-ichi Kurokawa awarded Rolf Wideröe Prize (2011.6.3)
topicsThe European Physical Society Accelerator Group announced that Shin-ichi Kurokawa, professor emeritus at KEK and vice president of Cosylab, was awarded the Rolf Wideröe Prize, which is awarded to an individual for his or her outstanding work in the particle accelerator field. ---more

・DG's Corner -Damage caused by the recent earthquake and recovery prospects- (2011.5.10)
First of all, I would like to express my deepest appreciation for the messages of concern, sympathy and encouragement that we received from all over the world since the major earthquake of March 11th. We are working to restore KEK as quickly as possible to its original condition so it can once again function as the exceptional research facility it was hitherto. Your messages do help a great deal in this difficult time.
Both the KEK-Tsukuba and KEK-Tokai (J-PARC) sites experienced tremors exceeding 6 on the Japanese seismic intensity scale, even though we are some 300 km away from the epicenter. This has caused a significant amount of damage to both facilities. ---more

・Accelerated Higher Intensity Heavy Ion Beam with New Linac System (2011.04.14)
Research Laboratory for Nuclear Reactors in Tokyo Institute of Technology had developed a multi-beam type RFQ (Radio Frequency Quadrupole) linac system accelerating several heavy ion beams in parallel in one cavity. This system has made it possible for generating high intensity heavy ion beams, never before possible such as 100 mA and more, without growing the machine scale. ---more
(highlights linked 2011.04.14)

・The Sixteenth meeting of the KEKB Accelerator Review Committee was held (2011.2.14)
The Sixteenth meeting of the KEKB Accelerator Review Committee was held on February 7-9, 2011. This was the first meeting since SuperKEKB was formally approved and funded, so the Committee has been expanded to include experts from all around the world who came to KEK to help make the project a success. ---more

*Web Album

・Japanese 9-cell SCRF cavity meets ILC specifications (2010.12.09)
Designing and fabricating an optimal accelerating cavity is not so simple. There are two important parameters scientists are looking for: the gradient of 35 megavolts per meter (MV/m) and the quality factor (Q0) of greater than 8×109. A Japanese cavity now fulfilled those requirements for the first time at a test which took place at the Superconducting radiofrequency Test Facility (STF) at KEK, adding momentum towards future mass production. ---more

(highlights linked 2010.12.09 / ILC Newsline linked 2010.12.09 )

・Japanese 9-cell SCRF cavity meets ILC specifications (2010.12.02)
topicsThe Japanese cavity achieved an important milestone. On 25 November, it fulfilled, for the first time, the production specifications for the International Linear Collider (ILC) in a vertical test conducted at KEK's Superconducting RF Test Facility (STF). The cavity, called MHI-013 is the 13th in a series of nine-cell cavities fabricated by Mitsubishi Heavy Industries Co., Ltd. It demonstrated the accelerating gradient of 31.5 megavolts per meter (MV/m) with an unloaded quality factor (Q0) over 1×1010, and 35 MV/m with Q0 over 0.8×1010. As 31.5 MV/m is the targeted operating gradient of the ILC, 35 MV/m allows ten percent margin for this operating gradient. ---more

・Start operation of the Small Electron Linear Accelerator for calibration of the Fluorescence Detector of the Telescope Array experiment (2010.10.14)
The Telescope Array ( TA ) experiment is a ultra-high energy cosmic rays ( UHECRs ) observation which is established in the desert area about 200 km far from Salt Lake City in Utah state, north U.S. We began the observation in April 2008. The UHECRs are the highest primary cosmic rays which have energy more than 1018 eV. However, we do not understand any fundamental features, for example the chemical composition, their generation and acceleration mechanism, and the theoretical flux limit ( GZK-cutoff ). ---more

(highlights linked 2010.10.21)

・IPAC10 Special Lectures to Commemorate the 120th Anniversary of the Birth of Yoshio Nishina 〜From TRISTAN to B-Factory〜 (2010.10.07)
TRISTAN was the first Japanese electron-positron collider, and built in 1981-1986. The collision energy attained was 64GeV, then the highest in the world. National Laboratory for High Energy Physics(KEK) was founded in 1971 as the first national laboratory for inter-university research, and a 12GeV proton synchrotron was built in 1971-1974 as its major research facility(KEK-PS). It must be noted that the KEK-PS energy was initially proposed to be 40Gev and compelled to lower to 12GeV to cope with the government's budget cut to a quarter of the initial demand( about 30BYen). Intriguing is that the 40GeV PS plan was realized as J-PARC after almost 40 years, though the machine design was considerably different each other. ---more

・The 26th OHO seminar on high-energy accelerator held at KEK (2010.10.05)
topics31 August -3 September, the OHO'10 seminar was held at KEK with 45 scientists and engineers form institutes, universities and industries. The purpose of OHO seminar is to develop and deepen the interest for the accelerator science of younger generations in both academia and industries. OHO seminar has been held once a year since 1984. ---more

・NSRRC adopted KEKB-type superconducting cavity for Taiwan Photon Source project (2010.9.30)
topicsNational Synchrotron Radiation Research Center (NSRRC) in Taiwan chose the KEKB-type superconducting cavity to be installed into the synchrotron storage ring of the Taiwan Photon Source (TPS), the third generation synchrotron light source currently under construction right next to the site of existing accelerator, Taiwan Light Source (TLS). Mitsubishi Heavy Industries, Japan, received the order to fabricate three cavities scheduled to be delivered to NSRRC in 2012. ---more
by courtesy of NSRRC

・The first Baseline Assessment Workshop for the ILC held at KEK (2010.9.30)
topics7-10 September, the first baseline assessment workshops (BAW-1) took place at KEK with 63 scientists and engineers from around the world. ---more

・Cast your vote for top Particle Physics Photowalk photograph (2010.9.28)
topicsOn August 7, more than 200 photographers had the rare opportunity to go behind the scenes at five laboratories in Asia, Europe and North America, as part of the first Global Particle Physics Photowalk. Thousands of photographs were submitted to the laboratories for local and global competitions. The laboratories have made their choices, each nominating three photographs for global competition. Now it’s your turn -- starting today, you may vote for up to three of your favorite photographs as part of the “people’s choice” global photowalk competition.

・KEK Openhouse 2010 (2010.9.6)
The Openhouse was on September 5, and some 3,300 people visited.
The visitors were interested in the research activities and the facilities of KEK.

*Web Album

origin In KEK Tsukuba campus, the four storage rings are operated for various user experiment. KEKB electron/positron ring (3 km circumference) is utilized for the high energy physics research. PF (187 m circumference) and PF-AR (377 m circumference) rings are the powerfull devices for the material and life science researches. KEK injector linac is a 600-m-long linear accelerator, and provides the electron and positron beams of different energy for the four independent rings. ---more

・Summer Challenge programme for young intelligence (2010.09.03)
About 90 students from all parts of Japan gathered at the Summer Challenge programme held at KEK, Tsukuba from 21 to 29 August 2010. Starting in 2007, this programme intended for junior students who are interested in high-energy physics was the fourth in the series this year. ---more

・The first global Particle Physics Photo Walk held at 5 world's particle physics labs (2010.09.03)
topics KEK took 40 photographers behind the scenes. On August 7, photographers, both amateurs and professionals visited, explored and took photos of KEK's facilities, accelerators, detectors, people and any objects interested them. They took part in the first global Particle Physics Photowalk took place on this same day around the world at five physics laboratories in five countries: CERN (Switzerland), DESY (Germany), Fermilab (USA), TRIUMF (Canada) and KEK. ---more

・The fifth POSIPOL workshop held at KEK (2010.06.10)
topics The POSIPOL 2010 workshop was held from 31 May to 2 June at KEK. It was the fifth in the POSIPOL series of workshops dealing with the physics aspects, the design issues, and the open questions concerning a polarized positron source in the framework of the next-generation electron-positron colliders such as the ILC or the Compact Linear Collider Study CLIC. ---more

・1st International Particle Accelerator Conference held in Kyoto (2010.06.10)
topics From 23 to 28 May, hundreds of accelerator experts took part in the world's first International Particle Accelerator Conference IPAC'10, a merger of three accelerator conferences: PAC in North America, EPAC in Europe, and APAC in Asia. Nearly 1,300 researchers, engineers, students, and industry experts from around the world were joined to discuss all aspects of accelerator science. "With the success of the IPAC'10, we can declare a real start of new series of international conference, IPAC," said Dr. Shin-ichi Kurokawa, a Professor Emeritus of KEK and the honorary chairman of IPAC'10. "The next IPAC in Asia will be held in 2013 in Shanghai. Now, I am confident that it is possible to hold world-level international conference in Asian countries, attracting more than 1,000 participants", Kurokawa said. ---more

・High Field Gradient RF System for J-PARC and Upgrade (2010.06.07)
origin We, KEK, cooperate with the Japan Atomic Energy Agency (JAEA) and developed a high field gradient RF system for a proton accelerator. This system is now under operation for J-PARC. The acceleration system is the “heart” of an accelerator and it is quite important because it determines the performance of the accelerator. A newly developed accelerating system using a Magnetic Alloy enables three improvements which are not available by older type systems. These are a higher field gradient than that of classic ones, mixing of multi-harmonic RF and high accuracy of the system below a few nano-seconds. We are also developing the system further by improving the magnetic material. This way, we expect to increase the beam intensity and improve the performance of the accelerator complex. ---more

・The 15th KEKB Accelerator Review Committee was held (2010.02.18)
origin The Fifteenth KEKB Accelerator Review Committee meeting was held on February 15-17, 2010. Appendix A shows the present membership of the Committee. The Committee was as always impressed by the high standard of the talks, both the technical content and the presentations themselves.

・1st Joint Asian Accelerator Workshop held in China(2010.01.18)
22-23 December, the Joint Asian Accelerator Workshop (JAAWS) was held at the Institute of High Energy physics (IHEP), in Beijing, China, as the first step for establishing a new initiative to promote stronger and more effective collaboration on R&D works in accelerator science and its application. The directors and leading scientists from core laboratories in five Asian countries - China, India, Japan, Korea and Russia - have gathered at a kickoff workshop to seek for possible future collaborations. ---more

・KEKB/Belle integrated luminosity reached 1000 fb-1(2009.12.18)
AT KEKB B-Factory, the total integrated luminosity accumulated by the Belle detector reached 1000 fb-1 on November 29th 2009, which was the initial goal of the KEKB project.

The Belle detector was installed in the KEKB accelerator in May 1999. This new record has been accomplished ten and a half years after the installation. The accumulation of 1000 fb-1 has been achieved for the first time in the world, while KEKB has been being operated with the world highest peak luminosity. The figure shows the history of the integrated luminosity at KEKB/Belle. It may seem that the accumulation has been achieved relatively smoothly. In reality, however, this has been done with various efforts such as those for increasing beam currents by overcoming a number of vacuum troubles and those for suppressing the effects of the electron clouds by installing solenoid coils all around the positron ring. To accumulate the integrated luminosity at a higher rate, it is important to lower the frequency of machine troubles and to keep the beams stably without beam aborts, in addition to raising the peak luminosity. In this sense, the achievement of this record is the fruits of the efforts of all members who have been concerned with KEKB including the staff of the facility division or the injector.
(KEK webtopics )

・Openhouse 2009 (2009.9.9)
The Openhouse was on September 6, and some 3,900 people visited.
The visitors were interested in the research activities and the facilities of KEK.

[Click image for larger view 752KB]

・Using Crab Cavities, KEKB Breaks Luminosity World Record (Current operation summary) (2009.6.18)
 Peak Luminosity2.1083 x 1034 cm-2 s-1 (2009.6.17 17:12)
 Daily Integrated Luminosity 1.4794 /fb (2009.6.14)

・Proton beam reaches neutrino target at J-PARC (2009.4.23)
At 19:09 on April 23, J-PARC has reached a new milestone with successful extraction of proton beam to a neutrino target.
The proton beam accelerated to 30 GeV in the J-PARC Main Ring was extracted and transported through the beam line which has 14 superconducting dipoles and then hit on the neutrino target.
This achievement denotes the start of challenge to send high-power neutrino beams to the Super-Kamiokande detector which locates 295 km west from the J-PARC cite for long baseline neutrino oscillation experiment.(J-PARC)

・Protons are successfully accelerated and transported to J-PARC Hadron Experimental Hall
A new milestone was set by the 50 GeV Synchrotron, which is the 3rd and the last stage of the accelerators of the Japan Proton Accelerator Research Complex (J-PARC), on January 27, 2009. Protons were accelerated up to 30 billion electron-volts (30 GeV), then successfully extracted to Hadron Experimental Hall in Nuclear and Particle Physics Facility and transported to the beam dump. (2009.1.28)

・ATF2 for R&D of nano-meter electron beam has been started(2009.1.9)
A new beamline for R&D toward nano-meter electron beam has started operation at KEK's Accelerator Test Facility - ATF.

dotKEK held the 13th Open Lecture (2008.10.18,25)
On October 18 and 25, KEK held the 13th Open Lecture at University of Tsukuba in Tsukuba Science City.

dotThe symposium "Starting up the world's most powerful accelerators:LHC and J-PARC" held in Tokyo (2008.09.29)

dotOHO'08 Accelerator Seminar held at KEK (September 2-5, 2008) (2008.09.09)

dotThe OHO Accelerator Seminar series have been held at KEK since 1984, aiming to train young scientists and encourage researchers from private companies to understand accelerator science. This year the seminar focused on ......  


dot Ms. Tanuja DIXIT of the accelerator science major was given the Best Studnet Poster Prize with European Particle Accelerator Conference 2008(EPAC'08) held in Genoa in Italy until June 23rd - June 27th. (08.07.08)

1MR: Successful injection of 3GeV proton beam, RF captured and extraction

At 22:27 of May 22nd 2008, the 3 GeV proton beams from the RCS (3GeV proton synchrotron) were successfully injected into the Main Ring (50GeV proton synchrotron). The beam was captured by RF and extracted to the beam dump after 1000 turns. The day after, the beam storage time was extended up to 1 second. It is the major milestone for the J-PARC. The next step is to accelerate beams to 30GeV (Phase I) and to extract beams to the experimental holes, which will start in the end of this year. (by nh 2008.5.27)

1Prof. Ohmi is recognized as one of the Outstanding Referees of Physical Review (08.03.27)

titleAccident of J-PARC Hadron Experimental Facilitytitle

・Restarted the user operation at MLF of J-PARC (2014.2.24)

・The cause of the malfunction of the EQ magnets for the slow extraction system of the 50-GeV synchrotron in J-PARC pdf (2013.11.27)

・External Expert Panel Meetings : Summary of the Report from the Working Group (2013.10.18)

・The 3rd External Expert Panel Meeting to Review the Radioactive Material Leak Accident to Review the Radioactive Material Leak Accident at the Hadron Experimental Facility of J-PARC at KKR Hotel Tokyo on 20 June 2013 Appendix 2-2 pdf (2013.9.4)

・Outline of the 3rd report on the radioactive material leak at the Hadron Experimental Facility of the Japan Proton Accelerator Research Complex (J-PARC) pdf (2013.9.4)

・3rd Accelerator Facility Accident Report to Nuclear Regulation Authority (2013.8.20)

・Minutes (Summary) and appendixes of the 2st External Expert Panel Meeting to Review the Radioactive Material Leak Accident at the Hadron Experimental Facility of the J-PARC (2013.8.8)

・1st External Expert Meeting Report (2013.8.2)

・Message from Director of J-PARC Center (2013.8.1)

・Minutes of the 1st External Expert Panel Meeting to Review the Radioactive Material Leak Accident at the Hadron Experimental Facility of the J-PARC (Summary) pdf (2013.7.17)

・A summary page on the leakage accident at the Hadron Experimental Facility of J-PARC is opened link (2013.7.8)

・2nd Accelerator Facility Accident Report to Nuclear Regulation Authority (2013.7.8)

・On a delay in suspending the operation of the accelerator complex and a delay in turning off the ventilation fans at the Hadron Experimental Hall in association with the radioactive material leak accident at the Hadron Experimental Facility of J-PARC pdf(2013.7.2)

・Results of the individual dose measurements from the Radioactive Material Release Accident at the Hadron Experimental Facility (HEF) pdf(2013.6.27)

・On submission of "the 2nd report on the leak accident of radioactive material at the Hadron Experimental Facility, the Japan Proton Accelerator Research Complex (J-PARC) " and "the accident / failure report" pdf(2013.6.21)

・On the establishment of an External Expert Panel to review the leak accident of radioactive material at the J-PARC Hadron Experimental Facility pdf(2013.6.20)

・Radiation Production Facility Accident Report (posted 5/31, updated 6/4) (2013.5.31)

・A summary of the accident at the Hadron Experimental Facility on May 23 2013 pdf (2013.5.31)

・Message from the Division Head (2013.5.28)

・Accident at J-PARC Hadron Experimental Facility (2013.5.27)

・Message from the Director of J-PARC Center to Users (2013.5.27)

・Message from the Director of J-PARC Center to Users (2013.5.27)

・Accident at J-PARC Hadron Experimental Facility (2013.5.27)

dotJ-PARC News - June 2016 (Issue #134) Aug. 26, 2016
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dotJ-PARC News - Dec. 2015 (Issue #128) Jan. 18, 2016
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dotJ-PARC News - July 2015 (Issue #123) Aug. 11, 2014
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dotJ-PARC News - May. 2015 (Issue #121) June 17, 2015
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dotJ-PARC News - Feb. 2015 (Issue #118) Mar. 18, 2015
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dotJ-PARC News - Dec. 2014 (Issue #116) Jan. 19, 2015
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dotJ-PARC News - June 2014 (Issue #110) July 28, 2014
dotJ-PARC News - May 2014 (Issue #109) June 25, 2014
dotJ-PARC News - Apr. 2014 (Issue #108) May 28, 2014
dotJ-PARC News - Mar. 2014 (Issue #107) Apr. 23, 2014
dotJ-PARC News - Feb. 2014 (Issue #106) Mar. 27, 2014
dotJ-PARC News - Jan. 2014 (Issue #105) Feb. 26, 2014
dotJ-PARC News - Dec. 2013 (Issue #104) Jan. 30, 2014
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dotJ-PARC News - Aug. 2013 (Issue #100) Sep. 19 2013
dotJ-PARC News - Jul. 2013 (Issue #99) Aug. 8, 2013
dotJ-PARC News - Jun.2013 (Issue #98) Jul. 9, 2013
dotJ-PARC News (Special Issue) Jun. 19, 2013
dotJ-PARC News - Apr. 2013 (Issue #97) May 14, 2013
dotJ-PARC News - Mar. 2013 (Issue #96) Apr. 12, 2013
dotJ-PARC News - Feb. 2013 (Issue #95) Mar. 22, 2013
dotJ-PARC News - Jan. 2013 (Issue #94) Feb. 21, 2013
dotJ-PARC News - Aug. 2012 (Issue #93) Jan. 22, 2013
dotJ-PARC News - Nov. 2012 (Issue #92) Dec. 18, 2012
dotJ-PARC News - Oct. 2012 (Issue #91) Nov. 30, 2012
dotJ-PARC News - Sep. 2012 (Issue #90) oct. 23, 2012
dotJ-PARC News - Aug. 2012 (Issue #89) Sep. 21, 2012
dotJ-PARC News - Jul. 2012 (Issue #88) Aug. 9, 2012
dotJ-PARC News - Jun. 2012 (Issue #87) June 24, 2012

dotJ-PARC Project Newsletter #65 Feb 15, 2017
dotJ-PARC Project Newsletter #64 Nov. 16, 2016
dotJ-PARC Project Newsletter #63 Aug. 19, 2016
dotJ-PARC Project Newsletter #62 May. 9, 2016
dotJ-PARC Project Newsletter #61 Feb 26, 2016
dotJ-PARC Project Newsletter #60 Oct. 29, 2015
dotJ-PARC Project Newsletter #59 Aug. 3, 2015
dotJ-PARC Project Newsletter Special Issue May 21, 2015
dotJ-PARC Project Newsletter #58 May 14, 2015
dotJ-PARC Project Newsletter #57 Feb. 13, 2015
dotJ-PARC Project Newsletter #56 Oct. 24, 2014
dotJ-PARC Project Newsletter #55 July 30, 2014
dotJ-PARC Project Newsletter #54 Apr. 30, 2014
dotJ-PARC Project Newsletter #53 Jan. 31, 2014
dotJ-PARC Project Newsletter Special Issue Jul. 23, 2013
dotJ-PARC Project Newsletter #52 Apr. 26, 2013
dotJ-PARC Project Newsletter #51 Jan. 30, 2013
dotJ-PARC Project Newsletter #50 Oct. 30, 2012
dotJ-PARC Project Newsletter #49 Aug. 2, 2012
dotJ-PARC Project Newsletter #48 Apr. 23, 2012
dotJ-PARC Project Newsletter #47 Jan. 26, 2012
dotJ-PARC Project Newsletter #46 Oct. 21, 2011
dotJ-PARC Project Newsletter #45 Jul. 25, 2011
dotJ-PARC Project Newsletter #44 Apr. 27, 2011
dotJ-PARC Project Newsletter #43 Jan. 25, 2011
dotJ-PARC Project Newsletter #42 Oct. 26, 2010
dotJ-PARC Project Newsletter #41 Aug 4, 2010
dotJ-PARC Project Newsletter #40 June 8, 2010
dotJ-PARC Project Newsletter #39 Mar. 1, 2010
dotJ-PARC Project Newsletter #38 Nov 17, 2009
dotJ-PARC Project Newsletter #37 Jul 23, 2009
dotJ-PARC Project Newsletter #36 May 7, 2009 Extraction of 30 GEV proton beam to hadron beam dump
dotJ-PARC Project Newsletter #35 Feb. 4, 2009 Success of 30GeV acceleration and extraction in MR---more

dotThe J-PARC 3-GeV RCS achieved a beam power of 210 kW for a period of 70 seconds at 25Hz, and 315kW-equivalent power in one-pulse operation. ...more
(19 September 2008 ) J-PARC Project Newsletter Special issue

1Birth of Pulsed Neutrons in J-PARC (J-PARC Newsletter Special Issue (Birth of neutrons)-2008/5/30-)
On May 30th, 2008. At 14:25, a shot of 3GeV protons from RCS (3 GeV synchrotron) was injected to the mercury target at MLF. http://j-parc.jp/MatLife/1stBeam/PromptReport.JPG

1J-PARC Project Newsletter #32 April, 2008

1J-PARC Project Newsletter #31 Feb., 2008

1J-PARC Special News and J-PARC Newsletter No.30 dispatch (Nov 1, 2007)

1Successful in accelerating a proton beam to the design energy of 3 GeV in the RCS at J-PARC (Oct 31, 2007)




1 News@KEKB Accl. Topics1

dotThe First T2K Neutrino Event Observed at Super-Kamiokande (2010.2.25)
Physicists from the Japanese-led multinational T2K collaboration announced today that they had made the first detection of a neutrino which had travelled all the way under Japan from their neutrino beamline at the J-PARC facility in Tokai village (about an hour north of Tokyo by train) to the gigantic Super- Kamiokande underground detector near the west coast of Japan, 295 km (185 miles) away from Tokai.  ---more

Using Crab Cavities, KEKB Breaks Luminosity World Record (Current operation summary) (2009.6.18)
 Peak Luminosity2.1083 x 1034 cm-2 s-1 (2009.6.17 17:12)
 Daily Integrated Luminosity 1.4794 /fb (2009.6.14)

1ILC News1(in Japanese)

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dot#28 - 2008/9/15 - Science Stimulates Creative Mind
dot#27 - 2008/8/15 - A life devoted to particle physics--In memory of Prof. Yoji Totsuka--
dot#26 - 2008/7/15 - Advancing international collaboration for ILC
dot#25 - 2008/6/15 - Launching a new forum for promotion of advanced accelerator technology and science
dot#24 - 2008/5/15 -Imminent startup of LHC -- World's biggest particle storage ring
dot#23 - 2008/4/15 -Polishing the beauty within - Technology base for superconducting cavities--
dot#22 - 2008/3/15 -ATF and ATF2 -- Nano ILC for Nano Beams --
dot#21 - 2008/2/15 - Prospects of science budget in US and UK.
dot#20 - 2008/1/15 - Situation of ILC-related budget in US and UK.