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A New Permanent Magnet Design System--World
Physics Technologies, Inc., 1105 Highland Circle, Blacksburg, VA
24060-5618; 540-953-2249
Dr. W. Peter Trower, Principal Investigator, wptinc@naxs.net
Ms. Anna W. Saunders, Business Official, wptinc@naxs.net
DOE Grant No. DE-FG02-01ER83342
Amount: $100,000
Two
large hybrid rare earth permanent magnet dipoles have been designed, built, and
are now operating in a 70 MeV racetrack microtron.
During their development, it was found that the existing rare earth
permanent magnet design techniques could be extended to quasi-sheet multipoles
to produce pure fields of a desired multipolarity in more compact magnets that
are more easily assembled and thus are less expensive.
Accordingly, two small quasi-sheet multipole quadrupoles, so-called
α-magnets, are now operating in racetrack microtron injection beam lines.
This project will use a detailed rare earth permanent magnet quasi-sheet
multipole model to design a large dipole for a 35 MeV racetrack microtron.
The model can calculate material configurations and geometrical
tolerances that will produce gap fields with desired multipolarity,
distribution, and uniformity. Phase I will develop the general quasi-sheet
multipole model and use it to study gap field distortions, gap field
variations with rare earth permanent magnet
block placement, and entrance/exit window fringe fields.
Local block re-magnetization, as well as steel plate and shimming
techniques, will be experimentally investigated.
Based on the result, bending dipole magnets for a 35 MeV racetrack
microtron will be designed.
Commercial Applications And Other Benefits as described by awardee: Compared with electromagnetic dipoles, the superior performance, smaller foot print, comparable capital costs, and smaller operating costs of large high-field quasi-sheet multipole dipoles should provide decisive advantages in fixed field industrial and research accelerators, beam transport lines, spectrometers, and medical imaging applications. Eliminating magnet coils and their power supplies reduces electrical power consumption, servicing costs, control system complexity, and space required while increasing overall reliability.