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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
Edward F. Splitt, Won-Ho Choe
Fusion Science and Technology | Volume 18 | Number 2 | September 1990 | Pages 273-280
Technical Paper | Plasma Heating System | doi.org/10.13182/FST90-A29299
Articles are hosted by Taylor and Francis Online.
A Monte Carlo simulation is developed to model minority ion transport and fundamental-mode (n = 1) ion cyclotron resonance heating (ICRH) in asymmetric magnetic field geometries. A discrete event model is used to superimpose resonance-heated nonadiabatic changes in a test ion's magnetic moment on a Coulomb pitch angle scattering model. The ion drift orbit equations of motion are set in a magnetic flux coordinate system that separates fast motion along the field lines from slow motion across the lines. The effects of ICRH on minority ion transport are investigated for 3He in stellarator plasmas. The energy distribution functions of these radio-frequency (rf)-heated ions develop high-energy tails as a result of a preferential gain in velocity in the direction perpendicular to the ambient magnetic field. Estimates of neoclassical flux surface diffusion coefficients indicate that ion losses in an rf-heated stellarator plasma can be an order of magnitude larger than non-ICRH losses. This can be attributed to an rf-increased fraction of trapped ions, which results in increased neoclassical transport across the toroidal flux surfaces.
