The transfer line design for the HEPS project
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ORIGINAL PAPER
The transfer line design for the HEPS project Yuanyuan Guo1,2
· Yuanyuan Wei1,2 · Yuemei Peng1,2 · Gang Xu1,2
Received: 1 June 2020 / Revised: 15 September 2020 / Accepted: 16 September 2020 / Published online: 11 October 2020 © Institute of High Energy Physics, Chinese Academy of Sciences 2020
Abstract Purpose The high energy photon source (HEPS), a 6-GeV synchrotron radiation facility with ultralow emittance, is under construction in China. Three transfer lines are designed for HEPS. One low-energy transfer line is used to deliver the 500 MeV beam provided by the linac to the booster. Two high-energy transfer lines are used to connect the booster and the storage ring to realize beam accumulation in the booster at 6 GeV. Method The design of the transfer lines is closely related to the layout and optics design of the storage ring, booster and linac. Based on the physics design of the storage ring, booster and linac, the design of the transfer lines has been adjusted. Results and conclusion In this paper, the considerations and design of the latest lattice of transfer lines are described. The design satisfies the requirements of the high efficiency transmission and injection. Keywords HEPS · Transfer lines · Optics · Error study
Introduction The high-energy photon source (HEPS), a kilometer-scale ultralow emittance storage ring light source with the energy of 6 GeV, is under construction in China [1]. It consists of a 500-MeV linac, a 500-MeV low-energy transfer line, a full energy booster ramping the beam energy from 500 MeV to 6 GeV, two 6-GeV high-energy transfer lines, a 6-GeV storage ring and synchrotron radiation beamlines. Figure 1 shows the layout of the HEPS. The low-energy transfer line (named LB) delivers the 500MeV beam from the linac to the booster. It is defined between the exit of the linac and the booster low-energy injection point which is located at the exit of the low-energy injection Lambertson. For HEPS, two transfer lines are designed to connect the booster and storage ring. One is BTS that transports the beam from the booster to the storage ring and it is defined between the entrance of the booster extraction Lambertson and the entrance of the quadrupole downstream of the storage ring injection kicker; and the other is STB that transports the
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Yuanyuan Guo [email protected]
1
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
2
University of Chinese Academy of Sciences, Beijing, China
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beam from the storage ring to the booster and it is defined between the exit of the quadrupole upstream of the storage ring extraction kicker and the exit of the booster high-energy injection Lambertson. Such special design, i.e., BTS and STB, is related to the injection scheme of the storage ring. On-axis transverse injection scheme is adopted for the storage ring. This scheme requires that the bunch charge from the injector should not be less than 14.4 nC when the storage ring operates in th
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