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Title: Adjustable Permanent Quadrupoles for the Next Linear Collider

Abstract

The proposed Next Linear Collider (NLC) will require over 1400 adjustable quadrupoles between the main linacs' accelerator structures. These 12.7 mm bore quadrupoles will have a range of integrated strength from 0.6 to 138 Tesla, with a maximum gradient of 141 Tesla per meter, an adjustment range of +0 to -20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micron during the 20% adjustment. In an effort to reduce costs and increase reliability, several designs using hybrid permanent magnets have been developed. Four different prototypes have been built. All magnets have iron poles and use Samarium Cobalt to provide the magnetic fields. Two use rotating permanent magnetic material to vary the gradient, one uses a sliding shunt to vary the gradient and the fourth uses counter rotating magnets. Preliminary data on gradient strength, temperature stability, and magnetic center position stability are presented. These data are compared to an equivalent electromagnetic prototype.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
798862
Report Number(s):
SLAC-PUB-8859
TRN: US0205045
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 2 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; COBALT; IRON; LINEAR ACCELERATORS; LINEAR COLLIDERS; MAGNETIC FIELDS; MAGNETIC MATERIALS; MAGNETS; PERMANENT MAGNETS; QUADRUPOLES; SAMARIUM; STABILITY

Citation Formats

Spencer, Cherrill M. Adjustable Permanent Quadrupoles for the Next Linear Collider. United States: N. p., 2001. Web. doi:10.2172/798862.
Spencer, Cherrill M. Adjustable Permanent Quadrupoles for the Next Linear Collider. United States. doi:10.2172/798862.
Spencer, Cherrill M. Tue . "Adjustable Permanent Quadrupoles for the Next Linear Collider". United States. doi:10.2172/798862. https://www.osti.gov/servlets/purl/798862.
@article{osti_798862,
title = {Adjustable Permanent Quadrupoles for the Next Linear Collider},
author = {Spencer, Cherrill M},
abstractNote = {The proposed Next Linear Collider (NLC) will require over 1400 adjustable quadrupoles between the main linacs' accelerator structures. These 12.7 mm bore quadrupoles will have a range of integrated strength from 0.6 to 138 Tesla, with a maximum gradient of 141 Tesla per meter, an adjustment range of +0 to -20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micron during the 20% adjustment. In an effort to reduce costs and increase reliability, several designs using hybrid permanent magnets have been developed. Four different prototypes have been built. All magnets have iron poles and use Samarium Cobalt to provide the magnetic fields. Two use rotating permanent magnetic material to vary the gradient, one uses a sliding shunt to vary the gradient and the fourth uses counter rotating magnets. Preliminary data on gradient strength, temperature stability, and magnetic center position stability are presented. These data are compared to an equivalent electromagnetic prototype.},
doi = {10.2172/798862},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {10}
}

Technical Report:

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