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IniFial trapping process of ultra slow antiprotons

Research Project

Project/Area Number 07044067
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionThe University of Tokyo

Principal Investigator

YAMAZAKI Yasunori  The University of Tokyo, College of Arts and Sciences Professor, 教養学部, 教授 (30114903)

Co-Investigator(Kenkyū-buntansha) HOLZSCHEITER Michael  Los Alamos National Laboratory P-23 Researcher, 主任研究員
AZUMA Toshiyuki  The University of Tokyo, College of Arts and Sciences Assistant, 教養学部, 助手 (70212529)
KOMAKI Ken-ichiro  The University of Tokyo, College of Arts and Sciences, 教養学部, 教授 (40012447)
Project Period (FY) 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1995: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordsantiproton / exotic atom / capture process / Renning trap
Research Abstract

The present research project were primarily planned for two years combined with Grant-in-Aid for Scientific Research to construct a transport beamline for ultra slow antiprotons. However, the project was approved only for the first year, which makes it very difficult to keep the consistency over the whole project.
The purpose of the project has been to prepare a transport beamline for ultra slow antiprotons extracted from a Penning trap which is installed at LEAR (low energy antiproton ring) of CERN,which enables, for the first time, to investigate the initial trapping processes of antiprotons into atomic orbitals under single collision conditions.Because of the limited time, we have, in the first stage, tried to find a way of cooling trapped antiprotons efectively, and then to optimize the extraction condition of slow antiprotons from the trap. In measuring the annihilation rate of antiprotons in the trap, one can estimate the capture cross section of antiprotons into atomic orbitals of the residual gas, which has been believed to be inversely proportional to the velocity of antiprotons, i.e., the annihilation rate stays constant. However, our experiment shows that the rate increases at the beginning of the cooling, and then start to decrease, which is a clear indication that the capture cross section saturates in the low velocity region or even decreases when the velocity decreases. The present project proceeds satisfactorily without any serious problem except for some delay originating in accelerator troubles. Now we believe that we are ready to make the major part of the proposed experiment successfully for the coming fiscal year, i.e., the beamtime is allocated almost every day from April to September, the beamline is sent out to CERN,etc. It is noted however, that the proposal asking continuation of the support to visit CERN has been rejected.

Report

(1 results)
  • 1995 Final Research Report Summary
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] X.Feng.Y.Yamazaki,et al.: "Tank circuit model applied to particles in a Penning Trap" J.Appl.Phys.79. 8-13 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] X.Feng et al.: "Tank circuit model applied to particles in a Penning trap" J.Appl.Phys.79. 8-13 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary

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Published: 1995-04-01   Modified: 2016-04-21  

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