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DTRA’s advancements in nuclear and radiological detection
A new, more complex nuclear age has begun. Echoing the tensions of the Cold War amid rapidly evolving nuclear and radiological threats, preparedness in the modern age is a contest of scientific innovation. The Research and Development Directorate (RD) at the Defense Threat Reduction Agency (DTRA) is charged with winning this contest.
C. S. Chang, Kaya Imre, Harold Weitzner, P. Colestock
Fusion Science and Technology | Volume 18 | Number 4 | December 1990 | Pages 618-624
Alpha Particles in Fusion Research | doi.org/10.13182/FST90-A29254
Articles are hosted by Taylor and Francis Online.
Control of radial alpha-particle transport by using ion cyclotron range of frequency (ICRF) waves is investigated in a large-aspect-ratio tokamak geometry. Spatially inhomogeneous ICRF wave energy with properly selected frequencies and wave numbers can induce fast convective transports of alpha particles at the speed of order valpha ∼ (PRF/nα∈0)ρp, where PRF is the ICRF wave power density, nα is the alpha-particle density, ∈0 is the alpha-particle birth energy, and ρp is the poloidal gyroradius of alpha particles at the birth energy. Application to International Thermonuclear Experimental Reactor (ITER) plasma is studied and possible antenna designs to control alpha-particle flux are discussed.
