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Title: A Superstrong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider

Abstract

A super strong permanent magnet quadrupole (PMQ) was fabricated and tested. It has an integrated strength of 28.5T with overall length of 10 cm and a 7mm bore radius. The final focus quadrupole of a linear collider needs a variable focal length. This can be obtained by slicing the magnet into pieces along the beamline direction and rotating these slices. But this technique may lead to movement of the magnetic center and introduction of a skew quadrupole component when the strength is varied. A ''double ring structure'' can ease these effects. A second prototype PMQ, containing thermal compensation materials and with a double ring structure, has been fabricated. Worm gear is selected as the mechanical rotating scheme because the double ring structure needs a large torque to rotate magnets. The structure of the second prototype PMQ is shown.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
839805
Report Number(s):
SLAC-PUB-10877
TRN: US0503407
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LINEAR COLLIDERS; MAGNETS; PERMANENT MAGNETS; QUADRUPOLES; TORQUE

Citation Formats

Mihara, T. A Superstrong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider. United States: N. p., 2004. Web. doi:10.2172/839805.
Mihara, T. A Superstrong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider. United States. doi:10.2172/839805.
Mihara, T. Mon . "A Superstrong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider". United States. doi:10.2172/839805. https://www.osti.gov/servlets/purl/839805.
@article{osti_839805,
title = {A Superstrong Adjustable Permanent Magnet for the Final Focus Quadrupole in a Linear Collider},
author = {Mihara, T.},
abstractNote = {A super strong permanent magnet quadrupole (PMQ) was fabricated and tested. It has an integrated strength of 28.5T with overall length of 10 cm and a 7mm bore radius. The final focus quadrupole of a linear collider needs a variable focal length. This can be obtained by slicing the magnet into pieces along the beamline direction and rotating these slices. But this technique may lead to movement of the magnetic center and introduction of a skew quadrupole component when the strength is varied. A ''double ring structure'' can ease these effects. A second prototype PMQ, containing thermal compensation materials and with a double ring structure, has been fabricated. Worm gear is selected as the mechanical rotating scheme because the double ring structure needs a large torque to rotate magnets. The structure of the second prototype PMQ is shown.},
doi = {10.2172/839805},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {12}
}

Technical Report:

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