Volume recombination and opacity in Alcator C-Mod divertor plasmas
نویسندگان
چکیده
منابع مشابه
Dissipative Divertor Operation in the Alcator C-mod Tokamak Dissipative Divertor Operation in the Alcator C-mod Tokamak
The achievement of large volumetric power losses (dissipation) in the Alcator C-Mod divertor region is demonstrated in two operational modes: radiative divertor and detached divertor. During radiative divertor operation, the fraction of SOL power lost by radiation is P R/PSOL0.8 with single null plasmas, n e < 2x10 20 m-3 and I < 1 MA. These plasmas sometimes have very high recycling, with nedi...
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Early results from the Alcator C-Mod tokamak indicate that ohmic energy confinement does not obey the Neo-Alcator scaling. Instead 'Ohmic L-mode' confinement, close to ITER89-P, is obtained, which substantially exceeds Neo-Alcator under some circumstances. ICRF-heated plasmas follow the same scaling. H-modes are observed both in ohmic and ICRF heated plasmas, with confinement enhancements of ab...
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-: In 1993 there were indications that the C-Mod inner divertor was being over-loaded[3] . As a result, an inner divertor modification is being installed in C-Mod. The new design is intended to allow a change in profile of the divertor to accommodate a higher plasma triangularity , strengthen the inner vessel wall to survive 9.0 Tesla, 2.5 MA disruptions and, eliminate tile rotation. The therma...
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Alcator C-Mod operation with a single null closed divertor produces clean, Zeff <1.3 plasmas and two dissipative divertor regimes. For ;1e > 0.7x 1020 m3 the divertor plasma is highly recycling and radiative with high densities and low temperatures near the strike points. If the temperature near the target plates drops to <5 eV, this plasma detaches from the plates over most of their surfaces. ...
متن کاملHydrogen Control in Alcator C-Mod Walls and Plasmas
The control of the hydrogen fraction in D plasmas [H/(H+D)] is necessary for efficient ICRF minority heating in Alcator C-Mod. Boronizing the chamber when H/(H+D) ~10% would promptly lower H/(H+D) to ~5%. However, the reduction was transitory when the accumulated boron layer was thick (> 6 μm) and with boron nitride tiles protecting the ICRF antennas, indicating that the H buried under a new B ...
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ژورنال
عنوان ژورنال: Physics of Plasmas
سال: 1998
ISSN: 1070-664X,1089-7674
DOI: 10.1063/1.872845