Short-bunch extraction in a rapid cycling synchrotron

Short bunch beams of high intensity are required by many applications, and they are usually obtained by using bunch compression before the extraction in relatively slow cycling synchrotrons or accumulator rings. In this article, short bunch extraction by the bunch compression method is proposed to a...

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Main Authors: Ye Zou, Jingyu Tang, Jinfang Chen, Xiao Li, Hong Sun
Format: Article
Language:English
Published: American Physical Society 2014-06-01
Series:Physical Review Special Topics. Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevSTAB.17.060101
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spelling doaj-49694eb811d54e7ba4d77eb3a1fdc46e2020-11-25T02:40:09ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022014-06-0117606010110.1103/PhysRevSTAB.17.060101Short-bunch extraction in a rapid cycling synchrotronYe ZouJingyu TangJinfang ChenXiao LiHong SunShort bunch beams of high intensity are required by many applications, and they are usually obtained by using bunch compression before the extraction in relatively slow cycling synchrotrons or accumulator rings. In this article, short bunch extraction by the bunch compression method is proposed to apply to a rapid cycling synchrotron (RCS) where the time duration is very limited to exploit the bunch compression process. The method is practically applied in the RCS of the China Spallation Neutron Source (CSNS) to obtain short-bunch beams for white neutron applications. Different short-bunch extraction scenarios have been studied, from keeping full beam power to reduced beam powers. A special desynchronization method is designed to solve the problem of slow acceleration during the bunch rotation process when the magnetic field is still ramping up. The space charge effect and beam loading effect during the bunch compression have also been taken into account in this high-intensity RCS. Multiparticle simulations have been carried out to show the effectiveness of the method with the input of the CSNS RCS. With a sacrifice of about two-thirds of the beam power, the rms bunch length of the extracted beam can be reduced to about one-ninth of the one in the nominal operation mode.http://doi.org/10.1103/PhysRevSTAB.17.060101
collection DOAJ
language English
format Article
sources DOAJ
author Ye Zou
Jingyu Tang
Jinfang Chen
Xiao Li
Hong Sun
spellingShingle Ye Zou
Jingyu Tang
Jinfang Chen
Xiao Li
Hong Sun
Short-bunch extraction in a rapid cycling synchrotron
Physical Review Special Topics. Accelerators and Beams
author_facet Ye Zou
Jingyu Tang
Jinfang Chen
Xiao Li
Hong Sun
author_sort Ye Zou
title Short-bunch extraction in a rapid cycling synchrotron
title_short Short-bunch extraction in a rapid cycling synchrotron
title_full Short-bunch extraction in a rapid cycling synchrotron
title_fullStr Short-bunch extraction in a rapid cycling synchrotron
title_full_unstemmed Short-bunch extraction in a rapid cycling synchrotron
title_sort short-bunch extraction in a rapid cycling synchrotron
publisher American Physical Society
series Physical Review Special Topics. Accelerators and Beams
issn 1098-4402
publishDate 2014-06-01
description Short bunch beams of high intensity are required by many applications, and they are usually obtained by using bunch compression before the extraction in relatively slow cycling synchrotrons or accumulator rings. In this article, short bunch extraction by the bunch compression method is proposed to apply to a rapid cycling synchrotron (RCS) where the time duration is very limited to exploit the bunch compression process. The method is practically applied in the RCS of the China Spallation Neutron Source (CSNS) to obtain short-bunch beams for white neutron applications. Different short-bunch extraction scenarios have been studied, from keeping full beam power to reduced beam powers. A special desynchronization method is designed to solve the problem of slow acceleration during the bunch rotation process when the magnetic field is still ramping up. The space charge effect and beam loading effect during the bunch compression have also been taken into account in this high-intensity RCS. Multiparticle simulations have been carried out to show the effectiveness of the method with the input of the CSNS RCS. With a sacrifice of about two-thirds of the beam power, the rms bunch length of the extracted beam can be reduced to about one-ninth of the one in the nominal operation mode.
url http://doi.org/10.1103/PhysRevSTAB.17.060101
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AT jingyutang shortbunchextractioninarapidcyclingsynchrotron
AT jinfangchen shortbunchextractioninarapidcyclingsynchrotron
AT xiaoli shortbunchextractioninarapidcyclingsynchrotron
AT hongsun shortbunchextractioninarapidcyclingsynchrotron
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