Calculations of alpha particle loss for reversed magnetic shear in the Tokamak Fusion Test Reactor

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872519· OSTI ID:544855

Redi, M H; White, R B; Batha, S H; Levinton, F M; McCune, D C ^[1]

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1. Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08540 (United States)

Hamiltonian coordinate, guiding center code calculations of the toroidal field ripple loss of alpha particles from a reversed shear plasma in the Tokamak Fusion Test Reactor (TFTR) [Fusion Technol. {bold 21}, 1324 (1992)] predict 40{percent} total alpha losses and 20{percent} ripple diffusion losses. This is about double the loss rate of a comparable non-reversed magnetic shear plasma. High central q is found to increase alpha ripple losses as well as first orbit losses of alphas in the reversed shear simulations. Alpha ripple transport on TFTR affects ions within r/a=0.5, not at the plasma edge. The entire plasma is above threshold for stochastic ripple loss of alpha particles at birth energy in the reversed shear case simulated, so that all trapped 3.5 MeV alphas are lost stochastically or through prompt losses. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 544855
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
DIFFUSION
ENERGY LOSSES
PARTICLE LOSSES
PLASMA SIMULATION
SHEAR
STOCHASTIC PROCESSES
TFTR TOKAMAK
TOKAMAK DEVICES