Title :
A high current shunt regulator for quadrupole magnets in PLS 2 GeV storage ring
Author :
Nam, S.H. ; Suh, J.H. ; Ha, K.M. ; Huang, J.-Y. ; Ko, I.S.
Author_Institution :
Pohang Accelerator Lab., South Korea
Abstract :
Total 144 quadrupole magnets are installed in the PLS. The magnets are connected in series with groups of two or 24. Each group is powered by a high-precision constant-current DC power supply. For the purpose of the beam based alignment of beam position monitors in the PLS, it is necessary to adjust the current of each quadrupole independently. To achieve this, a high current shunt regulator is designed. It can shunt a maximum 50 A of the quadrupole magnet current. The shunt regulator is programmable and the current amplitude can be varied linearly with a 12-bit resolution. Power transistors are used in the current shunt regulator. The operation of transistors is in linear region. The RS232C protocol is used for remote control and status report of the shunt regulator to the main control centre of the PLS. Preliminary result indicates that the calibration accuracy of the beam position monitor can be achievable in less than 10 μm
Keywords :
accelerator magnets; electron accelerators; load regulation; power supplies to apparatus; storage rings; 2 GeV; 50 A; DC power supply; PLS; RS232C protocol; beam position monitor; calibration; current amplitude; high current shunt regulator; power transistors; quadrupole magnet current; quadrupole magnets; storage ring; Accelerator magnets; Calibration; Electron beams; Laboratories; Power supplies; Power transistors; Protocols; Regulators; Storage rings; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753248
