Experience with measuring magnetic moments of permanent magnet blocks at Lawrence Berkeley Laboratory

Author

Nelson, D.H. ; Barale, P.J. ; Green, M.I. ; Van Dyke, D.A.

Author_Institution

Lawrence Berkeley Lab., California Univ., CA, USA

Volume

24

Issue

2

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

1098

Lastpage

1101

Abstract

Since May 1985, the Magnetic Measurements Engineering Group at Lawrence Berkeley Laboratory (LBL) has measured and sorted a total of 3834 permanent-magnet blocks. These magnetic blocks have been used in the construction of various successful accelerator beam-line elements including dipoles, quadrupoles, and wigglers. The authors report on observed variations in magnetic moments among blocks supplied by five manufacturers, describe the operational capabilities (accuracy, precision, and resolution) of the LBL Magnetic-moment Measurement and Sorting System (MMSS), cite the results of comparative calibrations by permanent-magnet manufacturers and other national laboratories, and suggest criteria for automating the MMSS for measuring the large number of permanent-magnet blocks required for the insertion devices for the projected LBL 1-2-GeV Synchrotron Radiation Source.

Keywords

particle accelerator accessories; permanent magnets; 1 to 2 GeV; Lawrence Berkeley Laboratory; Synchrotron Radiation Source; accelerator beam-line elements; accuracy; comparative calibrations; dipoles; insertion devices; magnetic moments; operational capabilities; permanent magnet blocks; precision; quadrupoles; resolution; wigglers; Accelerator magnets; Calibration; Laboratories; Magnetic devices; Magnetic moments; Magnetic variables measurement; Manufacturing automation; Permanent magnets; Sorting; Undulators;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.11421

Filename

11421