Design, fabrication and calibration of a cryogenic search-coil array for harmonic analysis of quadrupole magnets

Author

Green, M.I. ; Barale, P.J. ; Hassenzahl, W.V. ; Nelson, D.H. ; Neill, J. W O ; Schafer, R.V. ; Taylor, C.E.

Author_Institution

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

Volume

24

Issue

2

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

954

Lastpage

957

Abstract

A cryogenic search-coil array was fabricated for harmonic error analysis of Superconducting Super Collider model quadrupoles. The coil consists of three triplet of coils: the center-coil triplet is 10-cm long, and the end coil triplets are 70-cm long. Design objectives are a high bucking ratio for the dipole and quadrupole signals and utility at cryogenic operating currents (-6 kA) with sufficient sensitivity for use at room-temperature currents ( approximately 10 A). Individual coils were measured mechanically to +or-5 mu m, and their magnetic areas measured to 0.05%. A computer program was developed to predict the quadrupole and dipole bucking ratios from the mechanical and magnetic measurements. The calibration procedure and accuracy of the array are specified. Results of measurements of SSC model quadrupoles are also presented.

Keywords

beam handling equipment; calibration; cryogenics; storage rings; superconducting magnets; Superconducting Super Collider; accuracy; bucking ratio; calibration procedure; computer program; cryogenic search-coil array; design; fabrication; harmonic error analysis; magnetic areas; model quadrupoles; quadrupole magnets; sensitivity; triplet of coils; Area measurement; Calibration; Cryogenics; Current measurement; Error analysis; Fabrication; Harmonic analysis; Mechanical variables measurement; Superconducting coils; Superconducting magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.11385

Filename

11385