Title :
Beam-based offset calibration of the PLS BPM
Author :
Huang, J.-Y. ; Jung, D.H. ; Kim, K.H. ; Nam, S.H. ; Yoon, M. ; Ko, I.S.
Author_Institution :
Accel. Lab., Pohang Inst. of Sci. & Technol., South Korea
Abstract :
There are 108 beam position monitors in the PLS for the orbit measurement and closed orbit correction. As the BPM pickup electrodes are assembled directly on the 10 m-long vacuum chamber, calibration of the electrical center of BPMs have been done with the external RF transmission-reflection method. Since the closed orbit distortion is still larger than 500 μm RMS, we are developing the beam-based calibration method for the BPMs in PLS to improve the accuracy of the absolute position reading. In this report we present the method of beam-based calibration of BPMs and its experimental results
Keywords :
X-ray production; accelerator RF systems; calibration; electron accelerators; particle beam diagnostics; position measurement; storage rings; 10 m; PLS BPM; Pohang Light Source; absolute position reading; beam position monitors; beam-based offset calibration; closed orbit correction; closed orbit distortion; electron storage ring; external RF transmission-reflection method; orbit measurement; pickup electrodes; synchrotron light source; vacuum chamber; Calibration; Circuit testing; Distortion measurement; Electric variables measurement; Electrodes; Extraterrestrial measurements; Laboratories; Magnetic field measurement; Magnets; Storage rings;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751123
