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Thermographic reconstruction of heat load on the first wall of Wendelstein 7-X due to ECRH shine-through power
- Source :
- Nuclear Fusion, Nuclear Fusion, 2021, 61 (6), pp.066002. ⟨10.1088/1741-4326/abebea⟩, Nuclear fusion, 61 (6), Art.-Nr.: 066002
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- Electron cyclotron resonance heating (ECRH) is a powerful and flexible plasma heating technique that serves as the main heater at Wendelstein 7-X (W7-X) and will be used at ITER for start-up, heating, current drive and mitigation of plasma instabilities. In the case of poor or degraded microwave absorption, which is expected in the O2-mode heating scenario, a significant part of the beam directly hits the wall, leading to local overheating and potential damage. The ECRH shine-through power is mostly reflected onto the targets; only a small fraction is really absorbed through ohmic losses (typically 3% for graphite at 140 GHz). The ohmic losses do not only depend on the material properties and the frequency, but also on the polarization of the wave and the angle of incidence. This paper presents a thermographic analysis of ECRH experiments at W7-X, including heat load and temperature simulations of the first wall that include ECRH shine through. Two O-mode ECRH experiments with both a high temperature rise of the first wall and different angles of beam incidence on the wall’s surface are depicted. One experiment has 775 kW of power modulation (5 Hz) with mixed polarization (45% O-mode, 55% X-mode) and an EC beam angle almost normal to the first wall. The second has 550 kW of steady EC power with O-mode polarization, a shallow beam angle and increased power absorption by the material. It is shown that infrared thermography is a useful tool for measuring shine-through power and protecting wall components.
- Subjects :
- Ir thermography
[PHYS]Physics [physics]
Nuclear and High Energy Physics
Technology
Materials science
business.industry
heat flux calculation
Condensed Matter Physics
01 natural sciences
Electron Cyclotron Resonance Heating
010305 fluids & plasmas
Power (physics)
Optics
0103 physical sciences
infrared thermography
Wendelstein 7-X
Heat load
010306 general physics
business
ddc:600
Subjects
Details
- Language :
- English
- ISSN :
- 00295515 and 17414326
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion, Nuclear Fusion, 2021, 61 (6), pp.066002. ⟨10.1088/1741-4326/abebea⟩, Nuclear fusion, 61 (6), Art.-Nr.: 066002
- Accession number :
- edsair.doi.dedup.....d296e840fecfe306adacc38181e68f2f