Title :
An FPGA-based bunch-to-bunch feedback system at the Advanced Photon Source
Author :
Yao, C.-Y. ; Norum, E. ; DiMonte, N.
Author_Institution :
Argonne Nat. Lab., Argonne
Abstract :
The advanced photon source storage ring has several bunch fill patterns for user operation. The hybrids fill pattern consists of a single bunch with a charge of 16 mA and a bunch train of 56 bunches. Both horizontal and vertical instabilities are observed. Currently chromaticity correction is the only method available to overcome the instability. Beam lifetime and injection efficiency suffer because of high sextupole currents. A bunch-to-bunch feedback system is designed to overcome beam instability and reduce the required chromaticity correction. The feedback system is based on an FPGA DSP processor. The signal filtering algorithm is based on the time-domain-least-square (TDLF) method developed at SPring-8. We have just completed the integration of the system. We report the system design and some test results.
Keywords :
field programmable gate arrays; particle beam bunching; particle beam injection; particle beam stability; signal processing equipment; storage rings; Advanced Photon Source; DSP processor; FPGA-based bunch-to-bunch feedback system; beam injection efficiency; beam instability; beam lifetime; bunch fill patterns; chromaticity correction; sextupole currents; signal filtering algorithm; storage ring; time-domain-least-square method; Damping; Delay; Digital signal processing; Drives; Feedback; RF signals; Signal processing; Storage rings; Stripline; Strontium;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440238
