Initial results from the rebuilt EXTRAP T2R RFP device

QC 20100524 QC 20120206
The EXTRAP T2R thin shell reversed-field pinch (RFP) device has recently resumed operation after a major rebuild including the replacement of the graphite armour with molybdenum limiters, a fourfold increase of the shell time constant, and the replacement of the helical coil used for the toroidal field with a conventional solenoid-type coil. Wall-conditioning using hydrogen glow discharge cleaning was instrumental for successful RFP operation. Carbon was permanently removed from the walls during the first week of operation. The initial results from RFP operation with relatively low plasma currents in the range I-p = 70-100 kA are reported. RFP discharges are sustained for more than three shell times. Significant improvements in plasma parameters are observed, compared to operation before the rebuild. There is a substantial reduction in the carbon impurity level. The electron density behaviour is more shot-to-shot reproducible. The typical density is n(e) = 0.5-1 x 10(19) m(-3). Monitors of H-alpha line radiation indicate that the plasma wall interaction is more toroidally symmetric and that there is less transient gas release from the wall. The minimum loop voltage is in the range V-t = 28-35 V, corresponding to a reduction by a factor of two to three compared to the value before the rebuild.

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
REVERSED-FIELD PINCH
RESISTIVE-SHELL
TOROIDAL PINCH
FLUCTUATIONS
WALL
Atomic and molecular physics
Atom- och molekylfysik

Bergsåker, HenricKTH,Alfvénlaboratoriet,Fusion Plasma Physics(Swepub:kth)u1ebt1m5 (författare)
Cecconello, MarcoKTH,Alfvénlaboratoriet,Fusion Plasma Physics(Swepub:kth)u1hwqk6o (författare)
Drake, James RobertKTH,Alfvénlaboratoriet,Fusion Plasma Physics(Swepub:kth)u1ci9ir2 (författare)
Gravestijn, RobertKTH,Fysik,Atomic and Molecular Physics(Swepub:kth)u12dk43n (författare)
Hedqvist, AndersKTH,Fysik,Atomic and Molecular Physics(Swepub:kth)u1kiq1ip (författare)
Malmberg, Jenny A.KTH,Alfvénlaboratoriet(Swepub:kth)u1hp3n7y (författare)
KTHAlfvénlaboratoriet (creator_code:org_t)

Ingår i:Plasma Physics and Controlled FusionBRISTOL. ENGLAND : IOP PUBLISHING LTD43:11, s. 1457-14700741-33351361-6587

Av författaren/redakt...: Brunsell, Per; Bergsåker, Henri ...; Cecconello, Marc ...; Drake, James Rob ...; Gravestijn, Robe ...; Hedqvist, Anders; visa fler...; Malmberg, Jenny ...; visa färre...

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