Results from the US/USSR exchange for heat load material studies of simulated tokamak disruptions

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7042997

Gahl, J M; Crawford, J F ^[1]; McDonald, J M; McGrath, R T ^[2]; Zakharov, A ^[3]; Tserevitinov, S ^[4]; Barabash, V ^[5]; Guseva, M ^[6]

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1. New Mexico Univ., Albuquerque, NM (United States)
2. Sandia National Labs., Albuquerque, NM (United States)
3. Inst. for Physical Chemistry of the Russian Academy of Sciences (USSR)
4. Kurchatov Atomic Energy Inst. (USSR)
5. Efremov Inst. (USSR)
6. Gosudarstvennyj Komitet po Ispol'zovaniy

This paper presents recent results from exchange I.2 of the US/USSR Exchange Program of Cooperation for Magnetic Confinement Fusion. Previous results from this exchange demonstrated much lower than expected ablation of graphites when the graphites were exposed to disruption like heat fluxes delivered by plasma gun sources. This lower than expected ablation has been accounted for by the vapor shielding'' effect. Vapor shielding occurs when material is ablated from the surface of the graphite target early in the plasma pulse. This ablated material then shields the surface of the target from the rest of the incoming plasma pulse. Vapor shielding has been inferred from diagnostics and ablation data at all participating laboratories, and clear evidence of the effect has been found by laser interferometry at Kurchatov (Troitsk) in the 2MK-200 machine. Recent results from Kurchatov on the 2MK-200 and MKT experiments continue to indicate that the erosion of graphite exposed to disruption like heat fluxes is much lower than expected. Work from the University of New Mexico on the PLAIDS experiment confirms earlier important work conducted on the VIKA experiment at Efremov. This is particularly interesting in that PLAIDS and VIA have very similar plasma pulse characteristics.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7042997
• Report Number(s): SAND-92-0797C; CONF-920311-22; ON: DE92018285
• Resource Relation: Conference: 10. international conference on plasma-surface interactions in controlled fusion devices, Monterey, CA (United States), 30 Mar - 3 Apr 1992
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Ma
GRAPHITE
EROSION
ITER TOKAMAK
PLASMA DISRUPTION
THERMONUCLEAR REACTOR MATERIALS
HEAT FLUX
ABLATION
ELECTRON BEAMS
INTERNATIONAL COOPERATION
LASERS
SHIELDING
SIMULATION
BEAMS
CARBON
CLOSED PLASMA DEVICES
COOPERATION
ELEMENTAL MINERALS
ELEMENTS
LEPTON BEAMS
MATERIALS
MINERALS
NONMETALS
PARTICLE BEAMS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700480* - Fusion Technology- Component Development
Materials Studies- (1992-)
700420 - Fusion Technology- Plasma-Facing Components- (1992-)