Digital closed orbit feedback system for the Advanced Photon Source storage ring

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1147334· OSTI ID:389611

Chung, Y; Barr, D; Decker, G; Galayda, J; Lenkszus, F; Lumpkin, A; Votaw, A J ^[1]

---

1. Accelerator Systems Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)

Closed orbit feedback for the Advanced Photon Source (APS) storage ring employs unified global and local feedback systems for stabilization of particle and photon beams based on digital signal processing. Hardware and software aspects of the system will be described. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm, application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware, including the digital signal processor (DSPs), is distributed in 20 VME crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically networked reflective memories. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 389611
• Report Number(s): CONF-9510119--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 67; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ADVANCED PHOTON SOURCE
ANL
CONTROL SYSTEMS
DATA PROCESSING
DIGITAL SYSTEMS
EQUIPMENT INTERFACES
FEEDBACK
PHOTON BEAMS
STABILIZATION
STORAGE RINGS
SYNCHROTRON RADIATION
X RADIATION