Abstract
Fast electron localization and transport are important for tokamak current profile control schemes. The hard X-ray camera on PBX-M produces two-dimensional, time resolved tangential images of fast electron bremsstrahlung, from which a fast electron diffusion constant is calculated. Assuming a radially narrow lower hybrid power absorption profile, a momentum space absorption profile and a transport model, a model fast electron current density profile is calculated and compared to an experimentally derived profile, and the diffusion coefficient is adjusted until a good fit is found. Using this model, the authors compute an upper limit for an effective diffusion constant of D*<or=1.1 m2/sec to within a factor of two.
Published Version
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