| Project/Area Number |
06402015
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理学一般
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAZAKI Yasunori The University of Tokyo, College of Arts and Sciences, Professor, 教養学部, 教授 (30114903)
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| Co-Investigator(Kenkyū-buntansha) |
AZUMA Toshiyuki Univ.Tokyo, College of Arts and Sciences, Res.Ass., 教養学部, 助手 (70212529)
KOMAKI Ken-ichiro Univ.Tokyo, College of Arts and Sciences, Professor, 教養学部, 教授 (40012447)
黒木 健郎 東京大学, 科学警察研究所, 主任(研究職)
片山 一郎 東京大学, 原子核研究所, 教授 (30028237)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 1995: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1994: ¥10,400,000 (Direct Cost: ¥10,400,000)
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| Keywords | antiprotons / exotic atom / Penning trap / capture process / エキゾチック原子 / 低速反陽子 |
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| Research Abstract |
Antiproton beams of 5.9MeV/u are injected and trapped into a 2m Penning trap of 3.5T,and then electron-cooled down to a few eV.It is found that the lifetime of antiprotons in the trap does not depend very much on the outer vacuum from 10^<-9> Torr to 10^<-8> Torr, which indicates that the trapping cross section of slow antiprotons into atomic orbitals may be different from the so-called Langevin cross section, which is a good sign for experiments with gaseous targets, where powerful differential pumping systems are essential. Then extraction schemes of slow antiprotons from the trap have been studied constructing a track detector to determine the anihilation position of extracted antiprotons. In order to realize a differential pumping which amounts to five orders of difference, a differential pumping stage consisting of two turbo pumps, a sublimaion pump, and an ion pump for ultra high vacuum were prepared. Further, a large scale trajectory simulations including several Einzal lenses under varying magnetic field were performed, which proved that a reasonable transportation is possible with the above configurations. Spot sizes of extracted antiproton beams were observed employing a combination of a quartz disc and a high sensitivity CCD camera, which revealed the diameter of extracted antiprotons are about 3mm.
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