Orbit drift correction using correctors with ultra-high DAC resolution

Author

Bakker, R. ; B?¼rkmann, K. ; Falkenstern, F. ; Feikes, J. ; Franksen, B. ; G?¶rgen, R. ; Kuske, P. ; Lange, R. ; M?¼ller, I. ; M?¼ller, R. ; Rahn, J. ; Schneegans, T.

Author_Institution

BESSY, Berlin, Germany

Volume

2

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

1180

Abstract

At BESSY the planned continuous orbit drift correction could not go into routine operation as originally foreseen: the resolution of the 3 mrad correctors controlled by 16 bit DACs was insufficient and perturbed specific experiments unacceptably. Now a novel 2×16 bit coarse/fine type I/O board solved this problem while preserving the full dynamic range of the correctors. Permanent correction activity no more deteriorates experimental conditions. A typical orbit definition within +/- 5 μm at more than 90% of the BPMs during a day is achieved. Even large perturbations caused by e.g. decaying superconducting wave length shifter currents or residual effects of undulator operations are adequately suppressed

Keywords

beam handling techniques; digital-analogue conversion; electron accelerators; storage rings; 16 bit DAC; BESSY; correctors; orbit drift correction; superconducting wave length shifter currents; undulator; Control systems; Light sources; Lighting control; Noise measurement; Noise reduction; Power supplies; Stability; Superconducting magnets; Undulators; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.986620

Filename

986620