Outgassing measurement of an LHC collimator and estimation for the NEG performances

被引：5

作者：

Kamiya, Junichiro ^{[1
,2
]}

Baglin, Vincent ^{[2
]}

Bregliozzi, Giuseppe ^{[2
]}

Jimenez, Jose Miguel ^{[2
]}

机构：

[1] J PARC Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan

[2] CERN, CH-1211 Geneva 23, Switzerland

来源：

VACUUM | 2011年 / 85卷 / 12期

关键词：

Outgassing rate; NEG coatings; Particle accelerators; Collimators; LHC; NONEVAPORABLE GETTER FILMS;

D O I：

10.1016/j.vacuum.2011.03.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The outgassing rate of the collimators in the Large Hadron Collider (LHC) at CERN has an important role for the life-time of the Non-Evaporable Getter (NEC), and an accurate analysis allows the definition of future activities, like NEC vacuum activation. For these reasons, both, total outgassing rate and gas composition of a secondary collimator have been measured in the laboratory. The outgassing rate decreases by about two orders of magnitude by after bake-out and moreover, repeated bake-out further reduced the outgassing rate. The gas transmission through the NEC coated beam pipes and the resulting pressure distributions near the collimator were also measured in a dedicated setup. It is found that the main gas component after just 2 m of NEC coated beam pipe is CH(4) due to the extreme pumping speed of NEC for the other gases. Large amount of outgassing for H(2) and carbon related molecules are released when moving the collimator jaws. It is found that the NEC is very effective even in such case with large gas load. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1178 / 1181

页数：4

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