UO Bulletin Board
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| #1045 |
April 12, 2019. |
 The fire in the accelerating structure assembly room.
At 9:44 p.m. on April 3rd, in KEK Tsukuba campus, the fire alarm went off at electron-positron injector linac facility (a radiation
controlled area) and the fire engine was called to the site.
The cause of the alarm was determined to be an electric pulse modulator used in microwave power source, which had suffered a
burnout. This fire did not cause any human injuries or radiation leakage.
We apologize to everyone for any concern or alarm, and sincerely express our appreciation for understanding and cooperation
we received.
The location of the fire was in the accelerating structure assembly room, which is located at the southern end of the electron-
positron injector building, and is separated by a wall from the injector linac used by SuperKEKB, the PF and the PF-AR. However,
soot from the fire entered the injector area via gaps in the wall, and was found to have coated some of the equipment in the linac.
The linac has been shut down for thorough cleaning and inspection, particularly of the electronics and high-voltage equipment,
with a target date of April 22nd to start bringing the linac components back up for testing.
Health and Safety Office, Tsukuba Campus
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