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

Technical Report · Mon Dec 06 00:00:00 EST 2004

DOI:https://doi.org/10.2172/839805· OSTI ID:839805

Mihara, T ^[1]

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1. SLAC

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.

• Research Organization: Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
• Sponsoring Organization: SC
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 839805
• Report Number(s): SLAC-PUB-10877
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
LINEAR COLLIDERS
MAGNETS
PERMANENT MAGNETS
QUADRUPOLES
TORQUE