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Title: Radiation effects on rare earth permanent magnets. Master's thesis

With continuing improvements in rare earth permanent magnet (REPM) technology, applications for their use are being discovered that were previously not possible. Two such applications for permanent magnets are in focusing elements for linear accelerators and ion sources, and in insertion devices (wigglers and undulators) used to produce synchrotron radiation. However, these magnetic transport elements are subjected to high radiation levels. Consequently, there is considerable interest in the United States and abroad to discover and quantify the effects of radiation on REPMs. Using the Lawrence Livermore National Laboratory (LLNL) 100-MeV Linac, four different samples of REPM were irradiated to one to two gigarads of exposed dose from a bremsstrahlung production target in an attempt to simulate the consequences of beam spills of a high energy primary electron beam. Of the samples irradiated, Sm2Co17 proved to be the most resistant to gamma radiation. The electron transport code CYLTRAN of the Integrated Tiger Series (ITS), which is an electron and photon Monte Carlo simulation code, was used to determine the angular and energy spectra for both electrons and photons produced by the target used at the LLNL Linac.
Authors:
Publication Date:
OSTI Identifier:
6792207
Report Number(s):
AD-A-200344/0/XAB
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Research Org:
Naval Postgraduate School, Monterey, CA (USA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; COBALT; PHYSICAL RADIATION EFFECTS; PERMANENT MAGNETS; RARE EARTH ALLOYS; BREMSSTRAHLUNG; ELECTRON BEAMS; ELECTRONS; ENERGY; FOCUSING; ION SOURCES; LINEAR ACCELERATORS; MAGNETS; PHOTONS; PRODUCTION; SPECTRA; SYNCHROTRONS; ACCELERATORS; ALLOYS; BEAMS; CYCLIC ACCELERATORS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; LEPTON BEAMS; LEPTONS; MASSLESS PARTICLES; METALS; PARTICLE BEAMS; RADIATION EFFECTS; RADIATIONS; TRANSITION ELEMENTS 360106* -- Metals & Alloys-- Radiation Effects; 430300 -- Particle Accelerators-- Auxiliaries & Components