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

fYear

2007

fDate

25-29 June 2007

Firstpage

440

Lastpage

442

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4440238

Filename

4440238