Beam position monitor data acquisition for the Advanced Photon Source

F.R. Lenkszus, E. Kahana, A.J. Votaw, G.A. Decker, Youngjoo Chung, D.J. Ciarlette, R.J. Laird
Proceedings of International Conference on Particle Accelerators  
This paper describes the Beam Position Monitor (BPM) data acquisition scheme for the Advanced Photon Source (APS) storage ring. The storage ring contains 360 beam position monitors distributed around its 1104-meter circumference. The beam position monitor data acquisition system is capable of making turn-by-turn measurements of all BPMs simultaneously. It is VXI-based with each VXI crate containing the electronics for 9 BPMs. The VXI Local Bus is used to provide sustained data transfer rates of
more » ... a transfer rates of up to 13 mega-transfers per second to a scanner module. The system provides single-bunch tracking, bunch-to-bunch measurements, fast digital-averaged positions, beam position history buffering, and synchronized multi-turn measurements. Data is accessible to the control system VME crates via an MXI bus. Dedicated high-speed ports are provided to supply position data to beam orbit feedback systems. 4. Measure position at each BPM on each turn ( 3.6 microseconds for the storage ring). 5. Provide averaged beam position for higher accuracy. 6. Provide a beam history for each BPM . Major design goals included: 1. Minimize front panel connections by using available VXI backplane lines.
doi:10.1109/pac.1993.309140 fatcat:oqavfabblfe2jpcwd6jcugi3lu