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

Journal Article · 20 December 2017 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2017.11.090 · OSTI ID:1437276

Abliz, M. ^[1]; Jaski, M. ^[1]; Xiao, A. ^[1]; Jain, A. ^[1]; Wienands, U. ^[1]; Cease, H. ^[1]; Borland, M. ^[1]; Decker, G. ^[1]; Kerby, J. ^[1]

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1. Argonne National Lab. (ANL), Argonne, IL (United States)

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1437276
• Alternate ID(s): OSTI ID: 1582939
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 886, Issue C; ISSN 0168-9002
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English