| Project/Area Number |
03044143
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | National Laboratory for High Energy Physics |
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Principal Investigator |
MAKI Akihiro Physics Department, KEK, 物理研究部, 教授 (40044755)
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| Co-Investigator(Kenkyū-buntansha) |
THUN R. ミシカ゛ン大学, 教授
HELLER Ken Physics Department, University of Minnesota, 助教授
FIELDS Tom Physics Department, Argonne National Laboratory, 研究員
GREEN Dan Fermi National Accelerator Laboratory, 研究員
FELDMAN Gary Physics Department, Harvard University, 教授
YOSHIDA Takuo Physics department, Osaka City University, 理学部物理学教室, 助手 (30220651)
TERAMOTO Yoshiki Physics department, Osaka City University, 理学部物理学教室, 講師 (50163928)
OKUSAWA Tooru Physics department, Osaka City University, 理学部物理学教室, 助教授 (60047397)
TAKAHASHI Tamotsu Physics department, Osaka City University, 理学部物理学教室, 助教授 (20047137)
TAMURA Norio Physics Department, Okayama University, 理学部物理学教室, 助教授 (00025462)
SHINKAWA Takao Physics Department, KEK, 物理研究部, 助手 (70171064)
TERADA Susumu Physics Department, KEK, 物理研究部, 助手 (70172096)
ASANO Yuzo Institute of Applied Physics, University of Tsukuba, 物理工学系, 助教授 (80100808)
MORI Shigeki Institute of Applied Physics, University of Tsukuba, 物理工学系, 教授 (60100822)
THUN Rudi Physics Department, University of Michigan
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| Project Period (FY) |
1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Muon Chamber / Jet Chamber / Muon Trigger / SSC Experiment / EM Shower by Muon / ミュ-粒子による電磁シャワ- |
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| Research Abstract |
We have started a muon detector development program of a jet-type drift chamber of its high spatial resolution and two track separation capability. This chamber has two layers of the jet chamber with a half cell staggered. Each jet cell is physically separated from other cells and has only 3 sense wires in it. Therefore even in the case a wire is broken, only the particular single cell will become useless and all other cells can remain healthy. For the purpose of simple trigger, all set of three wires are pointing to the interaction point.
With the above basic design of the muon system, we have simulated the performances of the system using the computer codes we developed. The trigger is produced by the mean timer between the staggered pair of top and bottom cells with the additional coincidence with the scintillation counter signal. The trigger rates were carefully studied and it was found that an additional chamber which measures second coordinates needed to reduce the cosmic ray trig
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ger rate. Then that is enough in order to keep the total rate low enough for the data acquisition system for the threshold of 10 to 20 GeV. This trigger logic can not only realize the reasonable rate but also give us position information of the track within the cell with better than 1mm resolution which would be useful for later use in the higher level trigger.
Next we have carried a test experiment at the high energy muon beam at Fermilab, Illinois. The test chambers were build by the US collaborators and very similar with our jet chamber. The Japanese group participated the test experiment and analyzed the data. As the result, we found that high energy muons were often accompanied by the EM shower debris, 17% to 30% for the muon energies ranging from 50 GeV to 550 GeV. These data are very precious and were used to tune our simulation program. This enabled us to study the problem under different conditions from those under which we carried in the test experiment.
We fabricated a pair of small jet chambers and a large (8m X 3m) chamber to confirm the basic performances and to mainly study mechanical problems for the production of full size chambers, respectively. It was found that the small chambers worked as they were designed, but also found that there are some minor problems in the material and support mechanism of the cathode plates. Right now the large chamber is being modified to solve the problems. key word Detection of Muon Less
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