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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.
G. W. Shuy, D. Dobrott
Fusion Science and Technology | Volume 4 | Number 2 | September 1983 | Pages 252-257
Alternate Fuels | doi.org/10.13182/FST83-A22877
Articles are hosted by Taylor and Francis Online.
A conceptual tandem-mirror reactor (TMR) configuration consists of a solenoidal central-cell with its ends plugged by a combination of electrostatic and magnetic fields. The magnetic fields in the end plug also provide MHD stability. The electrostatic plugs for ions and electrons are created by combining hot electron plasmas and neutral beams for fueling and pumping. A large negative potential may be formed in the end plug to contain central cell electrons, but the central cell floating potential ϕf is driven negative as charge neutrality is maintained. Cat-d TMR plasma performance is assessed with respect to standard (positive), neutral and negative central cell potential operating modes. It is determined that the plasma. Q for a 2000 MW fusion power reactor is peaked for central cell potential ϕf near zero. This is because on one hand, the ion-loss cone is bigger for positive ϕf and the ion plug electrons must overcome larger ϕf + ϕc and hence more ECH is required to build the ion plug, and, on the other hand, the electron loss-cone is bigger for negative ϕf and synchrotron losses are severe. A zero-dimensional plasma physics model for the density and power balance of a Cat-d TMR has been developed from an existing code that models a d-t TMR operating with a positive central cell potential. The new Cat-d code models all potential operating modes and has been benchmarked.