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Title: Magnetic design of trim excitations for the Advanced Light Source storage ring sextupole

Abstract

The Advanced Light Source (ALS) storage ring sextupole is a unique multi-purpose magnet. It is designed to operate as a sextupole with three auxiliary trim modes: horizontal steering, vertical steering, and skew quadrupole. A perturbation theory for iron-dominated magnets developed by Klaus Halbach provides the basis for this design. The three trim excitations are produced by violating sextupole symmetry and are thus perturbations of the normal sextupole excitation. The magnet was designed such that all four modes are decoupled and can be excited independently. This paper discusses the use of Halbach`s perturbation theory to design the trim functions and to evaluate the primary asymmetry in the sextupole mode, namely, a gap in the return yoke to accommodate the vacuum chamber.

Authors:
 [1]
  1. Lawrence Berkeley Lab., CA (United States)
Publication Date:
OSTI Identifier:
282367
Report Number(s):
CONF-950691-
Journal ID: IEMGAQ; ISSN 0018-9464; TRN: IM9638%%165
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 4Pt1; Conference: 14. international conference on magnet technology, Tampere (Finland), 11-16 Jun 1995; Other Information: PBD: Jul 1996
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED LIGHT SOURCE; ELECTROMAGNETS; DESIGN; MULTIPOLES; MAGNETIC FIELDS; VACUUM SYSTEMS

Citation Formats

Marks, S. Magnetic design of trim excitations for the Advanced Light Source storage ring sextupole. United States: N. p., 1996. Web. doi:10.1109/20.508571.
Marks, S. Magnetic design of trim excitations for the Advanced Light Source storage ring sextupole. United States. https://doi.org/10.1109/20.508571
Marks, S. 1996. "Magnetic design of trim excitations for the Advanced Light Source storage ring sextupole". United States. https://doi.org/10.1109/20.508571.
@article{osti_282367,
title = {Magnetic design of trim excitations for the Advanced Light Source storage ring sextupole},
author = {Marks, S},
abstractNote = {The Advanced Light Source (ALS) storage ring sextupole is a unique multi-purpose magnet. It is designed to operate as a sextupole with three auxiliary trim modes: horizontal steering, vertical steering, and skew quadrupole. A perturbation theory for iron-dominated magnets developed by Klaus Halbach provides the basis for this design. The three trim excitations are produced by violating sextupole symmetry and are thus perturbations of the normal sextupole excitation. The magnet was designed such that all four modes are decoupled and can be excited independently. This paper discusses the use of Halbach`s perturbation theory to design the trim functions and to evaluate the primary asymmetry in the sextupole mode, namely, a gap in the return yoke to accommodate the vacuum chamber.},
doi = {10.1109/20.508571},
url = {https://www.osti.gov/biblio/282367}, journal = {IEEE Transactions on Magnetics},
number = 4Pt1,
volume = 32,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1996},
month = {Mon Jul 01 00:00:00 EDT 1996}
}