Title :
Detector solenoid compensation in the PEP-II B-factory
Author :
Nosochkov, Y. ; Cai, Y. ; Irwin, J. ; Sullivan, M. ; Forest, E.
Author_Institution :
Stanford Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
The PEP-II experimental detector includes a strong 1.5 T solenoid field in the interaction region (IR). With the fringe fields, the solenoid extends over a range of 6 m. Additional complications are that (1) it is displaced longitudinally from the interaction point (IP) by about 40 cm, (2) neither beam is parallel to the solenoid axis, and (3) the solenoid overlaps a dipole and a quadrupole on either side of the IP. In each half IR the correction system includes a set of skew quadrupoles, dipole correctors and normal quadrupoles to independently compensate the coupling, orbit perturbation, dispersion and focusing effect produced by the solenoid. The correction schemes for the Low Energy Ring (LER) and for the High Energy Ring (HER) are described, and the impact on the dynamic aperture is evaluated
Keywords :
accelerator magnets; colliding beam accelerators; electromagnets; electron accelerators; electron beam focusing; particle beam diagnostics; particle detectors; solenoids; storage rings; 1.5 T; HER; High Energy Ring; LER; Low Energy Ring; PEP-II B-factory; PEP-II experimental detector; correction schemes; coupling compensation; detector solenoid compensation; dipole correctors; dispersion; dynamic aperture; focusing effect; fringe fields; interaction point; interaction region; normal quadrupoles; orbit perturbation; skew quadrupoles; solenoid field; Dispersion; Infrared detectors; Laboratories; Lenses; Linear accelerators; Magnets; Optical coupling; Orbital calculations; Particle beams; Solenoids;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.504727
