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Understanding tungsten erosion during inter/intra-ELM periods in He-dominated JET-ILW plasmasHuber, A., fizik ...Tungsten erosion was quantified during inter/intra-ELM periods in He-dominated JET-ILW plasmas by optical emission spectroscopy. The intra-ELM tungsten sputtering in helium plasmas, which dominates ... the total W source, prevails by a factor of about 4 over inter-ELM sputtering in the investigated ELM frequency range from 90 Hz–120 Hz. He ions are mainly responsible for the W erosion during the ELMs in He plasmas. The strong in/out asymmetry of the ELM-induced W erosion is observed in He plasmas even at high ELM frequencies beyond 100 Hz. In Ohmic/L-mode plasmas and during the H-mode inter-ELM plasma phases both He2+ and Be2+ ionic species are major contributors to the W erosion. Their contribution depends on the electron temperature in the divertor: for Te > 15 eV both species cause significant W sputtering, for Te < 15 eV, Be2+ ions are solely responsible for the W erosion. Tungsten erosion during in both inter and intra-ELM periods in He-dominated plasmas are significantly larger than in deuterium plasmas. It is 15–25 times larger during the inter-ELM phase and in L-mode discharges at Te = 25–30 eV. On the other hand, the ELM-induced W source is by a factor of 3 larger than in D plasmas.Source: Physica scripta. - ISSN 0031-8949 (Vol. 96, Art. 124046, 2021, 12 str.)Type of material - article, component partPublish date - 2021Language - englishCOBISS.SI-ID - 96702723
Author
Huber, A., fizik |
Brezinšek, Sebastijan |
Huber, V. |
Solano, E. R. |
Sergienko, G. |
Borodkina, I. |
Aleiferis, S. |
Meigs, A. |
Tskhakaya, David |
Čufar, Aljaž |
Drenik, Aleksander, 1979- |
Kodeli, Ivan Aleksander |
Kos, Bor, 1989- |
Lengar, Igor |
Snoj, Luka, 1981-
Topics
jedrska fizika |
fizika plazme
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Huber, A., fizik | ![]() |
Brezinšek, Sebastijan | ![]() |
Huber, V. | ![]() |
Solano, E. R. | ![]() |
Sergienko, G. | ![]() |
Borodkina, I. | ![]() |
Aleiferis, S. | ![]() |
Meigs, A. | ![]() |
Tskhakaya, David | ![]() |
Čufar, Aljaž | 36329 |
Drenik, Aleksander, 1979- | 26476 |
Kodeli, Ivan Aleksander | 03943 |
Kos, Bor, 1989- | 38202 |
Lengar, Igor | 19167 |
Snoj, Luka, 1981- | 27819 |
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