TY - JOUR
T1 - Distortion of fuel-ion distribution functions by Alfvén eigenmodes in a tokamak DT plasma
AU - Sugiyama, S.
AU - Matsuura, H.
AU - Ogawa, K.
N1 - Funding Information:
The authors would like to thank Professor M Isobe, Professor M Osakabe, and Professor Y Todo for fruitful discussions and advice. We are grateful to Dr D A Spong for allowing us to use his three codes, and to Dr Y Suzuki for providing a VMEC input file for the ITER 15 MA scenario. This work was supported by JSPS, Grant-in-Aid for JSPS Fellows, 18J12685.
PY - 2018/8/22
Y1 - 2018/8/22
N2 - Fuel-ion velocity distribution functions can be distorted from a Maxwellian by Alfvén eigenmodes when the mode amplitudes are large, and the fusion reaction rate coefficient can be enhanced by the distortion. Assuming an ITER-like deuterium-tritium plasma containing an excited Alfvén eigenmode, we have investigated the modified deuteron and triton velocity distribution functions and the resulting fusion reaction rate coefficient. It is found that the non-Maxwellian components in the distribution functions form in directions parallel and antiparallel to the magnetic field lines due to the toroidal Alfvén eigenmodes or the ellipticity-induced Alfvén eigenmodes. Focusing on the effect of the distortion of the distribution functions, we discuss the dependence of the enhancement of the fusion reaction rate coefficient on the mode amplitudes and determine the threshold amplitude necessary to enhance the rate coefficient.
AB - Fuel-ion velocity distribution functions can be distorted from a Maxwellian by Alfvén eigenmodes when the mode amplitudes are large, and the fusion reaction rate coefficient can be enhanced by the distortion. Assuming an ITER-like deuterium-tritium plasma containing an excited Alfvén eigenmode, we have investigated the modified deuteron and triton velocity distribution functions and the resulting fusion reaction rate coefficient. It is found that the non-Maxwellian components in the distribution functions form in directions parallel and antiparallel to the magnetic field lines due to the toroidal Alfvén eigenmodes or the ellipticity-induced Alfvén eigenmodes. Focusing on the effect of the distortion of the distribution functions, we discuss the dependence of the enhancement of the fusion reaction rate coefficient on the mode amplitudes and determine the threshold amplitude necessary to enhance the rate coefficient.
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U2 - 10.1088/1361-6587/aad76d
DO - 10.1088/1361-6587/aad76d
M3 - Article
AN - SCOPUS:85053369584
SN - 0741-3335
VL - 60
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 10
M1 - 105003
ER -