5 D Phase Space Monte-Carlo Simulation of ECRH-driven Transport of Suprathermal Electrons in Stellarators
ECRH-driven transport of suprathermal electrons is studied in stellarators using new Monte Carlo simulation technique in 5D phase space. Two different phases of the ECRH-driven transport of suprathermal electrons can be seen; one is a rapid convective phase due to the direct radial motion of trapped electrons and the other is a slower phase due to the collisional transport. The important role of the radial transport of suprathermal electrons in the broadening of the ECRH deposition profile is clarified in W7-AS. The ECRH-driven flux is also evaluated and put in relation with the "electron root" feature recently observed in W7-AS. It is found that, at low collisionalities, the ECRH-driven flux due to the suprathermal electrons can play a dominant role in the condition of ambipolarity.
Bibliographic Reference: Article: Theory of Fusion Plasmas (2000) pp. 171-184
Availability: Theory of Fusion Plasmas (Journal)
Record Number: 200012125 / Last updated on: 2000-07-12
Original language: en
Available languages: en