Integration of orbit control with real-time feedback

Author

Lenkszus, F. ; Emery, L. ; Soliday, R. ; Shang, H. ; Singh, O. ; Borland, M.

Author_Institution

Argonne Nat. Lab., IL, USA

Volume

1

fYear

2003

fDate

12-16 May 2003

Firstpage

283

Abstract

The Advanced Photon Source uses two distinct control programs for orbit control and stability-a full-featured workstation-based program for orbit control (sddscontrollaw) and an EPICS-based system, the Real-Time Fast Feedback System (RTFS), to reduce orbit motion. The sddscontrollaw program has been ported to EPICS and moved from the UNIX environment to an EPICS IOC attached to the RTFS. This EPICS-based program uses the RTFS´s reflective memory to gather beam position information and write corrector power supplies, thus avoiding variable network latencies. This allows the orbit control to run at a correction rate 50 times that of the workstation implementation, which virtually eliminates orbit motion caused by insertion device gap changes. Issues raised by the integration of orbit control into the real-time feedback system and performance improvements are discussed.

Keywords

accelerator control systems; feedback; light sources; particle beam diagnostics; Advanced Photon Source; EPICS-based system; Real-Time Fast Feedback System; beam position information; corrector power supplies; orbit control integration; orbit motion elimination; real-time feedback; reflective memory; stability; variable network latencies; Clocks; Control systems; Delay; Digital signal processing; Feedback; Motion control; Optical control; Power supplies; Real time systems; Workstations;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1288902

Filename

1288902