Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

Electron cyclotron heating (ECH) power modulation experiments in GAMMA 10 tandem mirror have been carried out in order to generate and control the high heat flux and to make the ELM (edge localized mode) like intermittent heat load pattern for divertor simulation studies. The maximum energy density obtained by the use of present mirror antenna systems is about 0.08 MJ/m2 and is still far lower than that of ITER ELM. To achieve the generation of higher heat flux, the development of a new mirror antenna has carried out in order to concentrate the heating power on the axis. The calculated e-folding radius of power density has been improved from 63 mm for the present mirror to 40 mm for the new mirror antenna.