Effect of Resonant Magnetic Perturbation Field on Energetic Ion Behavior in the Large Helical Device

OGAWA Kunihiro
BOZHENKOV Sergey A.
ÄKÄSLOMPOLO Simppa
ISOBE Mitsutaka
NUGA Hideo
SEKI Ryosuke
KAMIO Shuji
FUJIWARA Yutaka
NISHITANI Takeo
OSAKABE Masaki
The LHD Experiment Group

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Publication date

October 2019

DOI

10.1585/pfr.14.1202159

Publisher

Japan Society of Plasma Science and Nuclear Fusion Research

Journal

Plasma and Fusion Research

Abstract

A study of the resonant magnetic perturbation (RMP) effect on transit beam ion behavior is performed using the total neutron emission rate (Sn) measurement of the deuterium plasma in the Large Helical Device. We conducted no RMP field, one-half RMP field, and full RMP field discharges and compared Sn that reflects the global beam ion confinement information. It is determined that owing to the RMP field, Sn decreased by approximately 15 - 30%. Numerical calculations based on the classical confinement of beam ions were performed to investigate the bulk plasma parameter effect on Sn. The calculated Sn shows that the degradation of Sn by RMP is mainly caused by the degradation of the electron temperature owing to island formation which results ...