an Introduction to Mebt For JKJ and Its Upgrade Design

WANG Sheng; FU Shi-Nian; Taiko Kato

Chinese Physics C> 2005, Vol. 29> Issue(11) : 1086-1090

an Introduction to Mebt For JKJ and Its Upgrade Design

Institute of High Energy Physics,CAS,Beijing 100049,China2 KEK,High Energy Accelerator Research Organization,1-1 Oho,Tsukuba-shi,Ibaraki-ken 305-0801,Japan

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Abstract：
The medium-energy beam-transport line (MEBT) plays an important role in reducing the beam loss in the Japan Proton Accelerator Research Complex (J-PARC). A MEBT was designed and constructed,with good beam matching and lower beam loss. A brief introduction to the MEBT and its beam test results are given. To further reduce the beam loss during the transient time of the chopper,a medium-energy beamtransport line with an anti-chopper has been designed. It accomplishes three tasks: matching the beam from the RFQ to the acceptance of the DTL, chopping the beam to produce gaps for injection into the rapid cycling ring which follows the linac, and returning the partially deflected beam back to the acceptance of the DTL. An RF chopper and an anti-chopper have been adopted in the beam line, and the optimization of the design of the chopper cavity is discussed. Details of the beam dynamics analysis are given.

References

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. Yamazaki Y. Design Issues for High-Intensity, High En-ergy Proton Accelerators. Proc. of 1996 Inter. Linac Conf.Geneva, 1996, 262. Fu S, Kato T. Nucl. Instrum. Methods, 2001, A457: 423—4373. Fu S, Kato T. Nucl. Instrum. Methods, 2000, A440: 296—3064. WANG S et al. Beam Commissioning of the J-PARC LinacMedium Energy Beam Transport at KEK-II. Proceeding ofthe 28th Japan Linac Meeting. WP-53, July, 2003, Tokai,Japan5. Staples J, Oshatz D et al. Design of the SNS MEBT.LINAC’2000. Monterey, MOD18, August, 2000

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WANG Sheng, FU Shi-Nian and Taiko Kato. an Introduction to Mebt For JKJ and Its Upgrade Design[J]. Chinese Physics C, 2005, 29(11): 1086-1090.

WANG Sheng, FU Shi-Nian and Taiko Kato. an Introduction to Mebt For JKJ and Its Upgrade Design[J]. Chinese Physics C, 2005, 29(11): 1086-1090. shu

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Received: 2005-05-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

an Introduction to Mebt For JKJ and Its Upgrade Design

Corresponding author: WANG Sheng,

Institute of High Energy Physics,CAS,Beijing 100049,China2 KEK,High Energy Accelerator Research Organization,1-1 Oho,Tsukuba-shi,Ibaraki-ken 305-0801,Japan

Received Date: 2005-05-16
Accepted Date: 1900-01-01
Available Online: 2005-11-05

Abstract: The medium-energy beam-transport line (MEBT) plays an important role in reducing the beam loss in the Japan Proton Accelerator Research Complex (J-PARC). A MEBT was designed and constructed,with good beam matching and lower beam loss. A brief introduction to the MEBT and its beam test results are given. To further reduce the beam loss during the transient time of the chopper,a medium-energy beamtransport line with an anti-chopper has been designed. It accomplishes three tasks: matching the beam from the RFQ to the acceptance of the DTL, chopping the beam to produce gaps for injection into the rapid cycling ring which follows the linac, and returning the partially deflected beam back to the acceptance of the DTL. An RF chopper and an anti-chopper have been adopted in the beam line, and the optimization of the design of the chopper cavity is discussed. Details of the beam dynamics analysis are given.