Title :
Beam position monitor system for PEP-II
Author :
Smith, Stephen R. ; Aiello, G. Roberto ; Hendrickson, Linda J. ; Johnson, Ronald G. ; Mills, Mark R. ; Olsen, Jeff J.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
We describe the beam position monitor system built for PEP-II, the B-factory at SLAC. The system reports beam position for bunches of between 5×108 and 8×1010 electron charges, either singly or as continuous streams of bunches every 4.2 ns. Resolution at full charge is to be better than 10 microns in a single turn. Higher resolution is available via on-board multi-turn averaging. The position signal is processed in a 20 MHz bandwidth around 952 MHz. This bandwidth, rather broader than that typical of RF position monitors, allows good resolution for low charge single bunches. Additional novel features include stringent control of return losses in order to minimize cross-talk between nearby bunches which may contain very different charges. The digitizing electronics is multiplexed between the two PEP-II storage rings. Design, construction, and installation experience, as well as first results with beam are presented
Keywords :
electron accelerators; high energy physics instrumentation computing; nuclear electronics; particle beam diagnostics; storage rings; 20 MHz; 4.2 ns; 952 MHz; B-factory; PEP-II; SLAC; beam position monitor system; bunches; cross-talk; digitizing electronics; on-board multiturn averaging; position signal; return losses; storage ring; Band pass filters; CAMAC; Cables; Calibration; Demodulation; Frequency; Monitoring; Pollution measurement; Signal processing; Switches;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751128
