Title :
False BPM Readings Affecting Orbit Feedback
Author :
Kang, H.S. ; Lee, E.H. ; Ha, K.M. ; Suh, J.H. ; Lee, W.W. ; Chun, M.H. ; Kim, Y.C. ; Huang, J.-Y. ; Lee, T.Y. ; Choi, J.
Author_Institution :
Pohang Accelerator Laboratory, Pohang 790-784, Korea, hskang@postech.ac.kr
Abstract :
A slow global orbit feedback (SOFB) is routinely operating in the usual user service operation at PLS. The orbit feedback uses 22 correctors in each plane which have 20-bit capability for the vertical plane and 16-bit capability for the horizontal plane, and the feedback speed is 4 seconds. The orbit stability in RMS was maintained below 1 µ m in both planes for one hour and 3 µ m for a 12-hour operation. The BPM chamber movement due to the change of synchrotron radiation heat load mainly limits the SOFB performance. The intensity dependence of BPM electronics is well compensated by a look-up table of BPM.
Keywords :
Electron beams; Feedback; Laboratories; Lattices; Linear particle accelerator; Power supplies; Radio frequency; Stability; Synchrotron radiation; Table lookup;
Conference_Titel :
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Print_ISBN :
0-7803-8859-3
DOI :
10.1109/PAC.2005.1590585
