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| MOPR002 |
Study on the Magnetic Measurement Results of the Injection System for CSNS/RCS |
injection, septum, dipole, neutron |
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- M.Y. Huang, S. Fu, N. Huang, L. Huo, H.F. Ji, W. Kang, Y.Q. Liu, J. Peng, J. Qiu, L. Shen, S. Wang, X. Wu, S.Y. Xu, J. Zhang, G.Z. Zhou
IHEP, Beijing, People's Republic of China
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Funding: Work supported by National Natural Science Foundation of China (11205185)
A combination of the H− stripping and phase space painting method is used to accumulate a high intensity beam in the Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS). The injection system for CSNS/RCS consists of three kinds of magnets: four direct current magnets (BC1-BC4), eight alternating current magnets (BH1-BH4 and BV1-BV4), two septum magnets (ISEP1 and ISEP2). In this paper, the magnetic measurements of the injection system were introduced and the data analysis was processed. The field uniformity and magnetizing curves of these magnets were given, and then the magnetizing fitting equations were obtained.
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| TUPM5X01 |
Injection Painting Improvements in the J-PARC RCS |
injection, controls, target, feedback |
299 |
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- S. Kato, K. Horino, H. Hotchi, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, T. Takayanagi, T. Tobita, T. Ueno
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
- H. Harada
JAEA, Ibaraki-ken, Japan
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In the J-PARC 3GeV RCS, the injection painting is essential method for the reduction of the space charge force. In this method, the H− beam from Linac is arranged on the large phase space area of the ring orbit during multiple turns. To implement this method, painting magnets form the time variable beam orbit. Therefore, the precise output current control of the magnet power supply is required. Because the power supply controlled by mainly feedforward signal is operated, we developed the iterative tuning method for the optimum feedforward parameter determination. As a result, we could reduce the tracking error of the current compared to before. Furthermore, to improve the accuracy of the painting area size, we applied the output readjustment additionally. Because the current monitor value of the power supply was different from the actual magnetic field due to the delay in the circuit and the leakage field, we corrected the tracking of the current based on the measured painting area size determined by the analysis of the measured COD. As a result, we achieved the precise injection painting. This talk presents these improvement results of the injection painting in the RCS.
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Slides TUPM5X01 [4.122 MB]
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| THAM6X01 |
The Path to 1 MW: Beam Loss Control in the J-PARC 3-GeV RCS |
injection, resonance, emittance, acceleration |
480 |
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- H. Hotchi, H. Harada, S. Kato, M. Kinsho, K. Okabe, P.K. Saha, Y. Shobuda, F. Tamura, N. Tani, Y. Watanabe, K. Yamamoto, M. Yamamoto, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
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The J-PARC 3-GeV RCS started 1-MW beam test from October 2014, and successfully achieved a 1-MW beam acceleration in January 2015. The most important issues in realizing such a high power routine beam operation are control and minimization of beam loss. This talk will present the recent progress of 1-MW beam tuning, especially focusing on our approaches to beam loss issues.
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Slides THAM6X01 [1.849 MB]
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