L-H transition studies on DIII-D to determine H-mode access for operational scenarios in ITER

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/51/10/103020· OSTI ID:1047655

Gohil, P ^[1]; Evans, T E ^[2]; Fenstermacher, M ^[3]; Ferron, J R ^[2]; Osborne, T H ^[2]; Schmitz, O ^[4]; Scoville, J T ^[2]

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1. General Atomics
2. General Atomics, San Diego
3. Lawrence Livermore National Laboratory (LLNL)
4. Forschungszentrum Julich, Julich, Germany

A comprehensive set of L-H transition experiments has been performed on DIII-D to determine the requirements for access to H-mode plasmas in ITER's first (non-nuclear) operational phase with H and He plasmas and the second (activated) operational phase with D plasmas. The H-mode power threshold, P(TH), was evaluated for different operational configurations and auxiliary heating methods for the different main ion species. Helium plasmas have significantly higher P(TH) than deuterium plasmas at low densities for all heating schemes, but similar P(TH) as deuterium plasmas at high densities except for H-neutral beam injection-heated discharges, which are still higher. Changes in P(TH) are observed when helium concentration levels in deuterium plasmas exceed 40%. There is a strong dependence of P(TH) on the magnetic geometry in the vicinity of the divertor. The trend of decreasing P(TH) with decreasing X-point height is observed for all of the main ion species irrespective of the heating method, which appears to indicate that there is a common physics process behind this effect for all of the ion species. Helium and deuterium plasmas exhibit a significant increase in P(TH) for strong resonant magnetic perturbations. The application of a local magnetic ripple of 3% from test blanket module mock-up coils did not change P(TH) in deuterium plasmas.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1047655
• Journal Information: Nuclear Fusion, Vol. 51, Issue 10; ISSN 0029--5515
• Country of Publication: United States
• Language: English