Variable gradient permanent-magnet quadrupole lenses

Conference · Sun Jan 01 00:00:00 EST 1989

DOI:https://doi.org/10.1109/PAC.1989.73174· OSTI ID:6276533

O'Shea, P G; Zaugg, T J; Maggs, R G; Schafstall, P; Dyson, J E

Rare earth (RE) permanent-magnet quadrupoles (PMQs) have been used for many applications in particle accelerators. They have the advantage over electromagnets of being lightweight and reliable. One difficulty associated with PMQs is that the quadrupole gradient is not easily adjusted. Over a certain range, the magnetization of RE magnets is a reversible function of temperature. We have developed a scheme to use this property to make variable gradient PMQs. The field gradient changes required for tuning are typically on the order of a few percent. For many RE magnets, this requires temperature changes of a few tens of degrees centigrade and is accomplished by actively heating or cooling the quadrupoles. 8 refs., 7 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6276533
• Report Number(s): LA-UR-89-886; CONF-890335-41; ON: DE89009386
• Resource Relation: Conference: 13. particle accelerator conference, Chicago, IL, USA, 20 Mar 1989; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BEAM OPTICS
ELECTROMAGNETIC LENSES
DESIGN
PERMANENT MAGNETS
QUADRUPOLAR CONFIGURATIONS
TEMPERATURE DEPENDENCE
CLOSED CONFIGURATIONS
LENSES
MAGNETIC FIELD CONFIGURATIONS
MAGNETS
MULTIPOLAR CONFIGURATIONS
430300* - Particle Accelerators- Auxiliaries & Components
430200 - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics