Performance and painting scheme considerations for the CSNS injection

Huang, Ming-Yang; Xu, Shouyan; Deng, Changdong; Wang, Sheng

doi:10.1088/1748-0221/19/05/T05009

Performance and painting scheme considerations for the CSNS injection

May 13, 2024

19 pages

Published in:

JINST 19 (2024) 05, T05009

Published: May 13, 2024

DOI:

10.1088/1748-0221/19/05/T05009

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Abstract: (IOP)

The accelerator complex of China Spallation Neutron Source(CSNS) consists of an 80 MeV H

^{-}

Linac and a 1.6 GeV protonrapid cycling synchrotron (RCS). The beam injection is one of themost important issues for the CSNS accelerator complex. In thispaper, the injection methods have been comprehensively studied,including phase space painting and H

^{-}

stripping. By using thedesign scheme of the anti-correlated painting, the beam power hassuccessfully reached 50 kW. However, some difficulties have beenfound in the higher power beam commissioning. In order to solvethese key problems, flexibility in the CSNS design has beenexploited to implement the correlated painting by using the risingcurrent curve of the pulse power supply. The effectiveness of thenew method has been verified in the simulation and beamcommissioning. By using the new method, the beam power on the targethas successfully risen to the design value. Secondly, according tothe CSNS beam commissioning experience, based on the present designof the injection system, a new idea is proposed to perform bothcorrelated and anti-correlated painting in the CSNS. By adopting anadditional vertical shift bump generated by four additionalalternating current (AC) magnets in the injection region, the localorbit can be manipulated to meet the requirement of correlatedpainting. The new method can not only perform the correlatedpainting, but also optimize the anti-correlated painting. Thesimulation study shows that the new method works well, and bothcorrelated and anti-correlated painting methods are well performed.

Accelerator Subsystems and Technologies
Accelerator modelling and simulations (multi-particle dynamics, single-particle dynamics)
Beam dynamics

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