Enchancement of EBT ring parameters during ion cyclotron heating

Significant enhancement of the relativistic electron ring parameters during ion cyclotron heating (ICH) on EBT-S has been observed. Even with moderate ICH power absorbed by the plasma (less than or equal to 10 kW), the ring temperature increased by as much as 40%, and the ring density doubled. The ICH power was applied to a single one-third turn antenna located midway between two toroidal field magnet coils; however, under certain conditions, the rings were enhanced all around the torus. (At the same time, the core plasma ion energy was strongly increased, with little effect on other core parameters). The mechanism responsible for the ring enhancement is not understood