| アブストラクト: |
The design of Panda - X, the first liquid xenon detector for Dark Matter
Search in the JinPing lab in Szechuan Province, China is completed. A
test set up will be filled aboveground for the first time before year
end. The detector will then be installed in the underground location in
early spring. This detector will initially have a modest size of about
25 kg fiducial. Independent of the results a more thorough search with a
detector on the 1 ton scale is planned. A simple scale up of the
standard liquid xenon double phase design requires too many compromises
in the design. Besides the larger mass also a higher light collection
efficiency, lower radio-active background, lower HV, less electronic
channels and a lower maximum drift time are on the wish list for such a
detector. At reasonable cost, it is impossible to improve all this
parameters simultaneously with the same structure which was so
successful in the XENON10 and XENON100 experiments. Some R&D for a new
principle is needed. Once completed, the larger detector can be
installed in the same environment as Panda-X, since outer cryostat
vessel, the passive shield and the cryogenic system are already
prepared for the larger size. |
