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Proceedings Paper

Systematic Selection Of Undulator Magnets Using The Techniques Of Simulated Annealing.
Author(s): A. D. Cox; B. P. Youngman
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Paper Abstract

The problem of sorting and placement of permanent magnets in undulators is considered. First, the constraints on the electron trajectory imposed by orbital stability and optimal synchrotron radiation output are used to construct a simple 'cost function' . This function describes the deviation of the magnetic field in the device from an ideal , and is dependent upon magnet placement. The cost function is then minimized using a Simulated Annealing algorithm until the optimal arrangement of elements is found. The results of optimization of magnet placement are presented for the particular case of the SSRL Beam Line V Multiundulator 15-period device. The electron path through the device is calculated and compared with a simpler optimization strategy, and with a random (unoptimi zed) magnet arrangement. The simulated annealing optimization strategy is found to offer significant advantages - resulting in a predicted electron trajectory that is close to ideal .

Paper Details

Date Published: 5 May 1986
PDF: 7 pages
Proc. SPIE 0582, Insertion Devices for Synchrotron Sources, (5 May 1986); doi: 10.1117/12.950916
Show Author Affiliations
A. D. Cox, Stanford Synchrotron Radiation Laboratory (United States)
B. P. Youngman, Stanford Synchrotron Radiation Laboratory (United States)

Published in SPIE Proceedings Vol. 0582:
Insertion Devices for Synchrotron Sources
Ingolf E. Lindau; Roman O. Tatchyn, Editor(s)

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