Author/Authors :
Nagasaki، نويسنده , , K. and Zushi، نويسنده , , H. and Mizuuchi، نويسنده , , T. and Kondo، نويسنده , , K. and Sano، نويسنده , , F. and Besshou، نويسنده , , S. and Okada، نويسنده , , H. and Iima، نويسنده , , M. and Kobayashi، نويسنده , , S. and Sakamoto، نويسنده , , K. and Obiki، نويسنده , , T. and Kurimoto، نويسنده , , Y. and Takada، نويسنده , , H. and Nakayama، نويسنده , , T. and Sato، نويسنده , , M. and Bigelow، نويسنده , , T. and Murakami، نويسنده , , Iain M. Murray-Lyon، نويسنده , , J.، نويسنده ,
Abstract :
An edge electron cyclotron heating (ECH) experiment has been performed on the Heliotron-E helical device using 35 GHz and 53 GHz gyrotrons. Transition phenomena have been observed during the 53 GHz edge ECH. The Hα emission and the outflux to the wall dropped, and then the core electron density increased by 20%–60%. The electron stored energy seems to be improved up to 20% after the transition. This phenomenon is found to depend strongly on the edge heating power, the target plasma density and the limiter position. A possible mechanism is discussed in terms of high energy electrons produced by the edge ECH.
