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Power deposition on a tungsten leading edge in a DIII-D He plasma
- Source :
- Nuclear Materials and Energy, Vol 19, Iss, Pp 94-100 (2019)
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The 2016 DIII-D DiMES tungsten (W) leading edge experiment in support of ITER studied heat loads in helium (He) plasmas with ELMs and compound ELMs (C-ELMs). The regime was close to the threshold for L-mode to H-mode transitions. In shots with ECH, C-ELMs produced in H-L back-transitions dominated the transient particle exhaust. Their duration (10–20 ms) was much longer than regular ELMs, and their heat loads higher by 2–3 times. The C-ELMS reduced the plasma density significantly, and some triggered (automated) gas puffing. This regime, with high particle and heat exhaust, may have relevance for He plasmas in ITER's start-up phase. Regular ELMs occurred during neutral beam (NB) powered shots. This paper describes new analyses on heat loads during and between C-ELMs in ECH-powered shot 166843. The results are generally consistent with a geometric solution for the parallel heat load at the plasma edge striking the leading edge. The power in the C-ELMs is sufficient to cause a temperature rise of ∼
- Subjects :
- 010302 applied physics
Nuclear and High Energy Physics
Leading edge
Materials science
DIII-D
Materials Science (miscellaneous)
chemistry.chemical_element
Plasma
Tungsten
lcsh:TK9001-9401
01 natural sciences
010305 fluids & plasmas
Nuclear Energy and Engineering
chemistry
Phase (matter)
0103 physical sciences
lcsh:Nuclear engineering. Atomic power
Particle
Atomic physics
Helium
Beam (structure)
Subjects
Details
- ISSN :
- 23521791
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- Nuclear Materials and Energy
- Accession number :
- edsair.doi.dedup.....3bbdfc4283fd0792b99b0dd29a1d6021