Initial results from the rebuilt EXTRAP T2R RFP device

• Published in: Plasma physics and controlled fusion Vol. 43; no. 11; pp. 1457 - 1470
• Main Authors: Brunsell, P R, Bergsåker, H, Cecconello, M, Drake, J R, Gravestijn, R M, Malmberg, A Hedqvist\ad{2 }and J-A
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.11.2001; Institute of Physics
• Subjects: Astron, cusp, and other magnetic traps; Atom- och molekylfysik; Atomic and molecular physics; Electric discharges; Exact sciences and technology; Field-reversed configurations, rotamaks, astrons, ion rings, magnetized target fusion, and cusps; FLUCTUATIONS; Fysik; Glow; corona; Magnetic confinement and equilibrium; NATURAL SCIENCES; NATURVETENSKAP; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; RESISTIVE-SHELL; REVERSED-FIELD PINCH; TOROIDAL PINCH; WALL; Plasma confinement; Plasma simulation; MHD model; Discharge current; Toroidal field divertors; Reversed field configuration; Theoretical study; Plasma-wall interactions; Reverse-field pinch; Molybdenum; Glow discharges
• ISSN: 0741-3335; 1361-6587; 1361-6587
• DOI: 10.1088/0741-3335/43/11/303

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.