### Abstract

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.

Original language | English |
---|---|

Article number | 105003 |

Journal | Plasma Physics and Controlled Fusion |

Volume | 60 |

Issue number | 10 |

DOIs | |

Publication status | Published - Aug 22 2018 |

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### All Science Journal Classification (ASJC) codes

- Nuclear Energy and Engineering
- Condensed Matter Physics

### Cite this

*Plasma Physics and Controlled Fusion*,

*60*(10), [105003]. https://doi.org/10.1088/1361-6587/aad76d

**Distortion of fuel-ion distribution functions by Alfvén eigenmodes in a tokamak DT plasma.** / Sugiyama, S.; Matsuura, Hideaki; Ogawa, K.

Research output: Contribution to journal › Article

*Plasma Physics and Controlled Fusion*, vol. 60, no. 10, 105003. https://doi.org/10.1088/1361-6587/aad76d

}

TY - JOUR

T1 - Distortion of fuel-ion distribution functions by Alfvén eigenmodes in a tokamak DT plasma

AU - Sugiyama, S.

AU - Matsuura, Hideaki

AU - Ogawa, K.

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.

UR - http://www.scopus.com/inward/record.url?scp=85053369584&partnerID=8YFLogxK

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U2 - 10.1088/1361-6587/aad76d

DO - 10.1088/1361-6587/aad76d

M3 - Article

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 10

M1 - 105003

ER -