Fast heat flux measurements in divertor region in tokamak COMPASS using ball-pen probes with sub-microsecond temporalresolution.
Project ID:GA15-10723S
Provider:Czech Science Foundation
Period:Jan 01, 2015 - Dec 31, 2017
Principal Investigator:Mgr. Jiří Adámek, Ph.D.
Co-investigators, , , , ,

Aims of the project: The investigation of the heat flux on the divertor during fast phenomena so-called ELM (periodical explosion of the plasma) is an important topic for large scale devices such tokamak JET, ASDEX Upgrade and crucial issue for the future device tokamak ITER in order to determine the life time and physical sputtering of the divertor targets. The divertor targets of ITER will be made of tungsten material. Its surface will be periodically melted and then solidify due to ELMs. This process will progressively erode the divertor targets and release the impurities to the plasma according to heat flux of each ELM. The heat flux measurements during ELM require high temporal resolution in order of microseconds. Nevertheless, such a measurements are not yet available at any devices. High quality infrared camera can provide max. 30 kHz frame rate, which is not enough to investigate precisely ELMs. Therefore, we propose to use a novel probe diagnostic, ball-pen probe, and to perform the systematic measurements in divertor on tokamak COMPASS with sub-microsecond time resolution.