Beam position feedback system for the Advanced Photon Source

Conference · Mon Nov 01 04:00:00 EST 1993

OSTI ID:10192137

Chung, Y

The Advanced Photon Source (APS) will implement both global and local beam position feedback systems to stabilize the particle and X-ray beams for the storage ring. The systems consist of 20 VME crates distributed around the ring, each running multiple digital signal processors (DSP) running at 4kHz sampling rate with a proportional, integral, and derivative (PID) control algorithm. The particle and X-ray beam position data is shared by the distributed processors through networked reflective memory. A theory of closed orbit correction using the technique of singular value decomposition (SVD) of the response matrix and simulation of its application to the APS storage ring will be discussed. This technique combines the global and local feedback systems and resolves the conflict among multiple local feedback systems due to local bump closure error. Maximum correction efficiency is achieved by feeding back the global orbit data to the local feedback systems. The effect of the eddy current induced in the relatively thick (1/2 inch) vacuum chamber by the AC corrector magnet field for local feedback systems is compensated by digital filters. Results of experiments conducted on the X-ray ring of the National Synchrotron Light Source and the SPEAR at Stanford Synchrotron Radiation Laboratory will also be presented.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10192137
• Report Number(s): ANL/ASD/CP--80717; CONF-9310204--2; ON: DE94002206
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430300
430400
ADVANCED PHOTON SOURCE
ALGORITHMS
AUXILIARIES AND COMPONENTS
BEAM MONITORS
BEAM POSITION
COMPUTERIZED CONTROL SYSTEMS
CORRECTIONS
DATA
DATA ANALYSIS
DESIGN
DIGITAL FILTERS
DISTRIBUTED DATA PROCESSING
EDDY CURRENTS
FEEDBACK
ORBIT STABILITY
PARTICLE BEAMS
STORAGE RINGS