The AD vacuum system: construction and commissioning

M. Brouet, J. Hansen, H. Klette, P. Strubin
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引用次数: 1

Abstract

CERN has built a new experimental facility, called the Antiproton Decelerator (AD), by transforming two existing machines: the "Antiproton Collector" (AC) and the "Antiproton Accumulator" (AA). To achieve adequate beam performance once the antiproton beam is decelerated to its final value of 0.1 GeV/c, it was necessary to lower the average pressure by nearly two orders of magnitude. For this purpose, a large number of additional pumps were installed and a very careful preparation was applied to a variety of special machine equipment which, in its original construction, was not designed for ultra-high vacuum operation. An important improvement in the outgassing rates was achieved through an extended, mild bake-out of tanks and vacuum vessels containing large amounts of ferrite material and multi-layer thermal insulation. This paper describes the necessary modifications of the vacuum system and in more detail the various steps taken to obtain the required pressure in the low 10/sup -10/ mbar range. It will also report on the unexpected difficulties which were encountered by re-using vacuum components that were not initially designed for bake-out.
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AD真空系统:施工及调试
欧洲核子研究中心通过改造现有的两台机器:“反质子收集器”(AC)和“反质子蓄能器”(AA),建造了一个新的实验设备,称为反质子减速机(AD)。一旦反质子束减速到最终值0.1 GeV/c,为了获得足够的束流性能,有必要将平均压力降低近两个数量级。为此,安装了大量额外的泵,并对各种特殊机器设备进行了非常仔细的准备,这些设备在其原始结构中不是为超高真空操作而设计的。通过对含有大量铁氧体材料和多层绝热材料的储罐和真空容器进行长时间、温和的烘烤,大大提高了放气速度。本文描述了真空系统的必要修改,并更详细地介绍了在低10/sup -10/ mbar范围内获得所需压力所采取的各种步骤。它还将报告重新使用最初不是为烘烤而设计的真空部件所遇到的意外困难。
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