Variable Permanent Magnet Quadrupole

Journal Article · Wed May 23 00:00:00 EDT 2007 · IEEE Trans.Appl.Supercond.16:224, 2006

OSTI ID:907959

Mihara, T; Iwashita, Y; Kumada, M; Spencer, C M

A permanent magnet quadrupole (PMQ) is one of the candidates for the final focus lens in a linear collider. An over 120 T/m strong variable permanent magnet quadrupole is achieved by the introduction of saturated iron and a 'double ring structure'. A fabricated PMQ achieved 24 T integrated gradient with 20 mm bore diameter, 100 mm magnet diameter and 20 cm pole length. The strength of the PMQ is adjustable in 1.4 T steps, due to its 'double ring structure': the PMQ is split into two nested rings; the outer ring is sliced along the beam line into four parts and is rotated to change the strength. This paper describes the variable PMQ from fabrication to recent adjustments.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 907959
• Report Number(s): SLAC-PUB-12504; TRN: US0703604
• Journal Information: IEEE Trans.Appl.Supercond.16:224, 2006, Vol. 16, Issue 224
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
FABRICATION
IRON
LINEAR COLLIDERS
MAGNETS
PERMANENT MAGNETS
QUADRUPOLES
Accelerators
ACCPHY