Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Experimental results of the laserwire emittance scanner for LINAC4 at CERN
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CERN LINAC4 激光线发射扫描仪的实验结果

DOI:
10.1016/j.nima.2016.02.018
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发表时间:
2016
期刊:
Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子:
--
通讯作者:
Hofmann T
Hofmann T
中科院分区:
--
文献类型:
--
作者:
Hofmann T

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在LHC注入器升级(LIU)的框架内,新的LINAC 4目前正在调试,以取代欧洲核子研究中心现有的LINAC 2质子源。预计在2016年底完成后,LINAC 4将把H−离子加速到160 MeV。为了测量H−梁的横向发射度,提出了一种基于光剥离的方法。该系统将使用脉冲激光器,通过光纤传输光,然后聚焦到H-光束上。激光光子有足够的能量分离外层电子并产生H 0/e−对。在下游偶极中,产生的H 0粒子与未剥离的H−离子分离,并使用专用检测器测量它们的分布。通过扫描聚焦的激光束穿过H−光束,可以重建H−光束的横向发射率。本文将首先讨论的概念,设计和模拟的激光发射度扫描仪,然后提出的结果从原型系统中使用的12兆电子伏的LINAC 4调试。
Within the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is currently being commissioned to replace the existing LINAC2 proton source at CERN. After the expected completion at the end of 2016, the LINAC4 will accelerate H−ions to 160 MeV. To measure the transverse emittance of the H−beam, a method based on photo-detachment is proposed. This system will operate using a pulsed laser with light delivered via an optical fibre and subsequently focused onto the H−beam. The laser photons have sufficient energy to detach the outer electron and create H0/e−pairs. In a downstream dipole, the created H0particles are separated from the unstripped H−ions and their distribution is measured with a dedicated detector. By scanning the focused laser beam across the H−beam, the transverse emittance of the H−beam can be reconstructed. This paper will first discuss the concept, design and simulations of the laser emittance scanner and then present results from a prototype system used during the 12 MeV commissioning of the LINAC4.
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