Adjustable Permanent Quadrupoles Using Rotating Magnet Material Rods for the Next Linear Collider

Conference · Mon Sep 24 04:00:00 EDT 2001

OSTI ID:786649

Volk, James T ^[1]

---

1. Fermilab

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 132 Tesla, with a maximum gradient of 135 Tesla per meter, an adjustment range of +0-20% and effective lengths from 324 mm to 972 mm. The magnetic center must remain stable to within 1 micrometer during the 20% adjustment. In an effort to reduce estimated costs and increase reliability, several designs using hybrid permanent magnets have been developed. All magnets have iron poles and use either Samarium Cobalt or Neodymium Iron to provide the magnetic fields. Two prototypes use rotating rods containing permanent magnetic material to vary the gradient. Gradient changes of 20% and center shifts of less than 20 microns have been measured. These data are compared to an equivalent electromagnet prototype.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 786649
• Report Number(s): FERMILAB-Conf-01/257-E
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
DESIGN
ELECTROMAGNETS
LINEAR ACCELERATORS
LINEAR COLLIDERS
MAGNETIC MATERIALS
PERFORMANCE
PERMANENT MAGNETS
QUADRUPOLES