A 2.5m long liquid hydrogen target for COMPASS
A 2.5m long liquid hydrogen target for COMPASS
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COMPASS 2.5m长液态氢目标
DOI：
10.1016/j.nima.2014.01.067
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
B. Vullierme
中科院分区：
文献类型：
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作者：
E. Bielert;J. Bremer;N. Doshita;R. Geyer;R. Hashimoto;N. Horikawa;S. Ishimoto;T. Iwata;K. Kondo;G.K. Mallot;H. Matsuda;T. Matsuda;Y. Miyachi;G. Nukazuka;O. Pirotte;H. Suzuki;S. Suzuki;B. Vullierme
为欧洲核子研究中心的COMPASS实验研制了一个2.5m长的液氢靶，用于通过深度虚康普顿散射（DVCS）过程研究核子自旋结构。为了识别独特的DVCS事件，需要检测产生的光子和慢质子。为了做到这一点，围绕目标的材料预算必须最小化。已经构建并测试了0.125 mm厚的Kapton®靶室和具有Mylar®窗口的1 mm厚的碳纤维真空室。最后，该目标系统在2012年底成功应用于COMPASS的DVCS试运行。本文的目的是详细介绍这种新研制的液氢靶装置。
A 2.5 m long liquid hydrogen target has been developed for the COMPASS experiment at CERN to investigate the nucleon spin structure via the Deeply Virtual Compton Scattering (DVCS) process. To recognize exclusive DVCS events, produced photons and slow protons need to be detected. In order to do so, the material budget around the target has to be minimal. A 0.125 mm thick Kapton® target cell and a 1 mm thick carbon fiber vacuum chamber with a Mylar® window have been constructed and tested. Finally, the target system was successfully employed during the DVCS pilot run in COMPASS at the end of 2012. The objective of this paper is to give a detailed description of this newly developed liquid hydrogen target apparatus.