IniFial trapping process of ultra slow antiprotons

超慢反质子的初始捕获过程

基本信息

批准号：
07044067
负责人：
YAMAZAKI Yasunori
金额：
$ 1.15万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044067/
关键词：
antiproton exotic atom capture process Renning trap

项目摘要

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.

本研究项目主要计划在两年内与助学金进行了科学研究，以构建超慢抗抗原子的运输光束线。但是，该项目仅在第一年获得批准，这使得整个项目的一致性变得非常困难。该项目的目的是为从李尔（Leale Energy Antipon Ring）安装在李尔（Lear）陷阱中的超慢抗抗脂蛋白中提取的超慢抗抗脂蛋白，该cern的首次陷入了对抗群集的最初陷阱，以调查对抗议的最初陷阱。在第一阶段，有限的时间试图找到一种有效地冷却抗蛋白质的方法，然后优化陷阱中慢速抗抗脂蛋白的提取条件。在测量陷阱中抗抗原剂的an灭速率时，可以估计抗磷脂的捕获横截面为残留气体的原子轨道，据信这与抗抗脂子的速度成反比，即灭绝率保持恒定。但是，我们的实验表明，在冷却开始时的速率增加，然后开始减少，这清楚地表明，捕获横截面在低速区域中饱和，甚至在速度降低时降低。本项目令人满意地进行，没有任何严重的问题，除了源于加速器问题的延迟。现在，我们相信我们已经准备好在未来财政年度成功完成拟议实验的主要部分，即，从四月到9月，几乎每天分配了梁时，将梁线发送给CERN等。但是，注意到，提议继续访问CERN的提议已被拒绝。