Beam measurement of the high frequency impedance sources with long bunches in the CERN Super Proton Synchrotron

被引：3
作者：
Lasheen, A. [1 ,2 ]
Argyropoulos, T. [1 ]
Bohl, T. [1 ]
Muller, J. F. Esteban [1 ]
Timko, H. [1 ]
Shaposhnikova, E. [1 ]
机构：
[1] CERN, CH-1211 Geneva, Switzerland
[2] Univ Paris 11, F-91400 Orsay, France
来源：
PHYSICAL REVIEW ACCELERATORS AND BEAMS | 2018年 / 21卷 / 03期
关键词：
D O I：
10.1103/PhysRevAccelBeams.21.034401
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Microwave instability in the Super Proton Synchrotron (SPS) at CERN is one of the main limitations to reach the requirements for the High Luminosity-LHC project (increased beam intensity by a factor 2). To identify the impedance source responsible of the instability, beam measurements were carried out to probe the SPS impedance. The method presented in this paper relies on measurements of the unstable spectra of single bunches, injected in the SPS with the rf voltage switched off. The modulation of the bunch profile gives information about the main impedance sources driving microwave instability, and is compared to particle simulations using the SPS impedance model to identify the most important contributions. This allowed us to identify the vacuum flanges as the main impedance source for microwave instability in the SPS, and to evaluate possible missing impedance sources.
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页数：13
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