Beam optimization of helium injector for coupled RFQ–SFRFQ linac

The coupled RFQ–SFRFQ (CRS) cavity designed in Peking University is a new type linac that coupled radio frequency quadrupole (RFQ) and separated function radio frequency quadrupole (SFRFQ) structure into a single cavity. An upgraded helium injector for the CRS cavity consisting of a 2.45GHz permanen...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2014-08, Vol.756, p.55-61
Main Authors: Xia, W.L., Wang, Z., Lu, Y.R., Chen, J., Zhao, J., Ren, H.T., Zhu, K., Peng, S.X., Chen, J.E.
Format: Article
Language:English
Subjects:
Beam optimization
Beams (radiation)
Control system
CRS
Helium
Helium injector
Holes
Injectors
Optimization
Quadrupoles
Radio frequencies
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Summary:The coupled RFQ–SFRFQ (CRS) cavity designed in Peking University is a new type linac that coupled radio frequency quadrupole (RFQ) and separated function radio frequency quadrupole (SFRFQ) structure into a single cavity. An upgraded helium injector for the CRS cavity consisting of a 2.45GHz permanent magnet electron cyclotron resonance (ECR) ion source and a 1.16m low energy beam transport (LEBT) has been constructed and tested. The beam conditions of the injector were carefully optimized to satisfy the requirements of the CRS linac, the corresponding control system and a two-dimension scanner code CRSv1.0 were developed for optimizing the beam transmission from LEBT section to the entrance of the CRS cavity. The beam transmission efficiency has reached to approximately 87.5% as well as the optimized operating parameters were obtained by means of the scanner code.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2014.04.049