First beam test of Laser Engineered Surface Structures (LESS) at cryogenic temperature in CERN SPS accelerator
First beam test of Laser Engineered Surface Structures (LESS) at cryogenic temperature in CERN SPS accelerator
复制标题
DOI：
10.1088/1742-6596/1067/8/082017
复制
发表时间：
2018-04
期刊：
影响因子：
--
通讯作者：
R. Salemme;V. Baglin;S. Calatroni;P. Chiggiato;B. Di Girolamo;E. García-Tabarés Valdivieso;B. Jenninger;L. Prever-Loiri;M. Sitko;S. Wackerow;A. Abdolvand
中科院分区：
文献类型：
--
作者：
R. Salemme;V. Baglin;S. Calatroni;P. Chiggiato;B. Di Girolamo;E. García-Tabarés Valdivieso;B. Jenninger;L. Prever-Loiri;M. Sitko;S. Wackerow;A. Abdolvand
电子云减缓是高强度正粒子加速器的基本要求，以保证低温系统中的束流稳定性和有限的热负荷。在欧洲核子研究中心（CERN）的大型强子对撞机（HL-LHC）的高亮度升级中，激光工程表面结构（LESS）正在被考虑作为一种选择，以减少面对光束的表面的二次电子产额（SEY），从而抑制电子云现象。作为这项研究的一部分，一个2.2米长的光束屏幕（BS）与LESS已在低温下进行了测试，在冷孔实验（COLDEX）设施在SPS加速器在欧洲核子研究中心。在本文中，我们描述了束屏的制造过程，所采用的激光处理技术，并讨论了我们在COLDEX确认电子云抑制的第一次观察。
Electron cloud mitigation is an essential requirement for accelerators of positive particles with high intensity beams to guarantee beam stability and limited heat load in cryogenic systems. Laser Engineered Surface Structures (LESS) are being considered, within the High Luminosity upgrade of the LHC collider at CERN (HL-LHC), as an option to reduce the Secondary Electron Yield (SEY) of the surfaces facing the beam, thus suppressing the electron cloud phenomenon. As part of this study, a 2.2 m long Beam Screen (BS) with LESS has been tested at cryogenic temperature in the COLD bore EXperiment (COLDEX) facility in the SPS accelerator at CERN. In this paper, we describe the manufacturing procedure of the beam screen, the employed laser treatment technique and discuss our first observations in COLDEX confirming electron cloud suppression.