Title :
PHASEFIX-correcting the tunes of the SLC arcs
Author :
Haissinski, J. ; Bambade, P. ; Brown, K.L. ; Burke, D.L. ; Fieguth, T.H. ; Hutton, A. ; Mattison, T. ; Murray, J.J. ; Phinney, N. ; Placidi, M. ; Sands, M. ; Sheppard, J.C. ; Toge, N. ; Weinstein, A.
Author_Institution :
Lab. de l´´Accel. Lineaire, Orsay, France
Abstract :
The betatron phase advance tunes are crucial parameters in the SLC (Stanford Linear Collider) arc optics because of the strong cross coupling between the x and y phase spaces, which takes place at rolled achromat boundaries. Phase measurements have been performed with an accuracy of about 0.3°/cell and, initially, substantial deviations from the design (108°) were observed. Corrections on an achromat-by-achromat basis have been performed to reduce the phase errors within less than 1°/cell. They were done by adjusting a current balance between focusing (F) and defocusing (D) magnets and by changing the horizontal relative displacements of F and D magnets using the XMOV magnet movers or with realignment work
Keywords :
beam handling equipment; beam handling techniques; linear accelerators; PHASEFIX; SLC arcs; Stanford Linear Collider; XMOV magnet movers; arc optics; betatron phase advance tunes; current balance; defocusing magnets; focusing magnets; phase measurements; rolled achromat boundaries; strong cross coupling; tune correction; Distortion measurement; Electron beams; Extraterrestrial measurements; Lattices; Linear accelerators; Magnets; Particle beams; Phase distortion; Phase measurement; Silicon compounds;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73446
