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- J. Chen, C.S. Chen, K.H. Hu, K.T. Hsu, C.H. Kuo, D. Lee, K.K. Lin
SRRC, Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
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An extension of existing multiplex BPM electronics to provide capability
for turn-by-turn beam position and phase advance measurement is
implemented. The system can be configured as turn-by-turn beam position
measurement or phase advance and coupling measurement. For turn-by-turn
mode, the system performed four consecutive measurements of four BPM
buttons. Data acquisition is synchronize with beam excitation.
Turn-by-turn beam position is reconstructed by these four independent
measurements. This system was named as pseudo-turn-by-turn beam position
monitor system (PTTBPM). Resonance excitation of the stored beam and
adopting lock-in techniques can measure betatron phase and local
coupling. Design considerations of the system and preliminary beam test
results are presented in this report.
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