Calculation of prompt loss and toroidal field ripple loss under neutral beam injection on EAST

Neutral beam injection is a major auxiliary heating method in the EAST experimental campaign. This paper gives detailed calculations of beam loss with different plasma equilibria using the guiding center code ORBIT and NUBEAM/TRANSP. Increasing plasma current can dramatically lower the beam ion prompt loss and ripple loss. Countercurrent beam injection gives a much larger prompt loss fraction than co-injection, and ripple-induced collisionless stochastic diffusion is the dominant loss channel.

[1]  L. Lao,et al.  Kinetic equilibrium reconstruction on EAST tokamak , 2013 .

[2]  R. White,et al.  Perturbative study of energetic particle redistribution by Alfvén eigenmodes in ITER , 2012 .

[3]  W. Heidbrink,et al.  Phenomenology of energetic-ion loss from the DIII-D tokamak , 2010 .

[4]  Wang Jinfang,et al.  Simulation on Heating and Current Drive Using Neutral Beam Injection with Variable Injection Angle on EAST , 2010 .

[5]  吴斌,et al.  Simulation on Heating and Current Drive Using Neutral Beam Injection with Variable Injection Angle on EAST , 2010 .

[6]  T. Takizuka,et al.  Numerical analysis of the effect of fast-ion losses on plasma rotation in a tokamak with toroidal field ripple , 2008 .

[7]  W. Suttrop,et al.  Effect of radial electric field and ripple on edge neutral beam ion distribution in ASDEX Upgrade , 2008 .

[8]  E. Strumberger,et al.  Fast particle losses due to NTMs and magnetic field ripple , 2007 .

[9]  Roscoe White,et al.  The Theory of Toroidally Confined Plasmas: Revised Second Edition , 2006 .

[10]  G. Bateman,et al.  The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library , 2004 .

[11]  R. Budny,et al.  Simulations of alpha particle ripple loss from the International Thermonuclear Experimental Reactor , 1996 .

[12]  R. Budny,et al.  Collisional stochastic ripple diffusion of alpha particles and beam ions on TFTR , 1995 .

[13]  T. Nishitani,et al.  Fast ion losses due to toroidal field ripple in JT-60U , 1994 .

[14]  R. White,et al.  Study of stochastic toroidal field ripple losses of charged fusion products at the midplane of TFTR , 1993 .

[15]  Robert J. Goldston,et al.  Theory of mode-induced beam-particle loss in tokamaks , 1983 .

[16]  R. White,et al.  Confinement of high energy trapped particles in tokamaks , 1981 .

[17]  A. Boozer.  Enhanced transport in tokamaks due to toroidal ripple , 1980 .