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Title: A concept for canceling the leakage field inside the stored beam chamber of a septum magnet

Here, the Advanced Photon Source is in the process of upgrading its storage ring from a double-bend to a multi-bend lattice as part of the APS Upgrade Project (APS-U). A swap-out injection scheme is planned for the APS-U to keep a constant beam current and to enable a small dynamic aperture. A novel concept that cancels out the effect of leakage field inside the stored beam chamber was introduced in the design of the septum magnet. As a result, the horizontal deflecting angle of the stored beam was reduced to below 1 µrad with a 2 mm septum thickness and 1.06 T normal injection field. The concept helped to minimize the integrated skew quadrupole field and normal sextupole fields inside stored beam chamber as well.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 886; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Beam trajectories; Injected beam; Leakage field; Magnet design; Septum magnet
OSTI Identifier:
1437276

Abliz, M., Jaski, M., Xiao, A., Jain, A., Wienands, U., Cease, H., Borland, M., Decker, G., and Kerby, J.. A concept for canceling the leakage field inside the stored beam chamber of a septum magnet. United States: N. p., Web. doi:10.1016/j.nima.2017.11.090.
Abliz, M., Jaski, M., Xiao, A., Jain, A., Wienands, U., Cease, H., Borland, M., Decker, G., & Kerby, J.. A concept for canceling the leakage field inside the stored beam chamber of a septum magnet. United States. doi:10.1016/j.nima.2017.11.090.
Abliz, M., Jaski, M., Xiao, A., Jain, A., Wienands, U., Cease, H., Borland, M., Decker, G., and Kerby, J.. 2017. "A concept for canceling the leakage field inside the stored beam chamber of a septum magnet". United States. doi:10.1016/j.nima.2017.11.090.
@article{osti_1437276,
title = {A concept for canceling the leakage field inside the stored beam chamber of a septum magnet},
author = {Abliz, M. and Jaski, M. and Xiao, A. and Jain, A. and Wienands, U. and Cease, H. and Borland, M. and Decker, G. and Kerby, J.},
abstractNote = {Here, the Advanced Photon Source is in the process of upgrading its storage ring from a double-bend to a multi-bend lattice as part of the APS Upgrade Project (APS-U). A swap-out injection scheme is planned for the APS-U to keep a constant beam current and to enable a small dynamic aperture. A novel concept that cancels out the effect of leakage field inside the stored beam chamber was introduced in the design of the septum magnet. As a result, the horizontal deflecting angle of the stored beam was reduced to below 1 µrad with a 2 mm septum thickness and 1.06 T normal injection field. The concept helped to minimize the integrated skew quadrupole field and normal sextupole fields inside stored beam chamber as well.},
doi = {10.1016/j.nima.2017.11.090},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 886,
place = {United States},
year = {2017},
month = {12}
}