Z.X. Xie, M.T. Kang, Z.C. Mu
IHEP CSNS, Guangdong Province, People’s Republic of China
D.P. Jin, L. Zeng, Y.L. Zhang, P. Zhu
IHEP, Beijing, People’s Republic of China
D.Y. Wang
DNSC, Dongguan, People’s Republic of China
The bunch size of HEPS is up to micrometer level, so it is very vulnerable to external interference. FOFB(Fast Orbit Feedback) is used to counteract external interference and improve beam quality. HEPS Fofb independently developed hardware equipment, used to collect 576 BPM data, and then distributed to 192 fast corrector power supply after matrix operation and PI operation. Fofb is divided into 16 sub-sites, each sub-site uses a single circuit main board, each site processes 36 BPM data, 24 (X & Y axis) corrector power supply. Two Xilinx FPGA chips are mounted on the circuit board, one is for high-speed data processing, the other is network transmission and low-speed data processing. Because the single board processing business is very large, there are more than 15 channels of high current and low noise power supply, more than 60 channels of low jitter clock, and tens of centimeters of 10Gbps high-speed transmission path. This paper will introduce the simulation and design of power supply, clock and high-speed transmission in detail.
Studies of Beam Loss Monitors at the China Spallation Neutron Source
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T. Yang, W.L. Huang, F. Li, X.J. Nie, R.Y. Qiu, J.L. Sun, A.X. Wang, T.G. Xu, Zh.H. Xu
IHEP CSNS, Guangdong Province, People’s Republic of China
M.Y. Liu, M. Meng, J.M. Tian, L. Zeng
IHEP, Beijing, People’s Republic of China
Funding:National Natural Science Foundation of China (Grants No. 11575219, No. 11705215, and No. 11805220). Beam loss detection is essential for the machine protection and the fine tuning of the accelerator to reduce the induced radioactivity. The beam loss monitors (BLM) at the China Spallation Neutron Source (CSNS) are mainly divided into the following types: the coaxial cylindrical ionization chamber (IC) filled with Ar/N2 gas mixture, Xe, BF3 gas, and the scintillator with photomul-tipliers, among which the Ar/N2 IC is the main type. In the low-energy section of the linac (beam energy <20 MeV), the BF3 BLMs enclosed by a high-density poly-ethylene (HDPE) moderator are utilized to detect the beam losses. The Monte Carlo program FLUKA is employed to perform the relevant simulations. This paper presents the summary of the beamloss detection for the CSNS BLM system. Experimental studies and Monte Carlo simulations for beam loss monitors Tao Yang, et al. Phys. Rev. Accel. Beams 24, 032804 (2021)
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