Speaker
Mr
Takeshi Ido
(Japan)
Description
The measurement of electrostatic potential fluctuations and density fluctuations using a heavy ion beam probe(HIBP) and magnetic field fluctuations using Mirnov coils clarified that the energetic-particle (EP)-driven geodesic acoustic mode (GAM) was excited in the central region of LHD plasmas. In addition, it was observed that the ion temperature measured using a neutral particle analyzer (NPA) increased during the GAM excitation. The ion-heating power through the collisionless damping of the GAM[1] can quantitatively explain the observed rate of the ion-temperature change. Thus, a new energy channel from the EPs to bulk ions through the GAM has been demonstrated for the first time.
Country or International Organization of Primary Author
Japan
Primary author
Mr
Takeshi Ido
(Japan)
