TY - JOUR
T1 - First results from MAST
AU - Sykes, A.
AU - Akers, R.J.
AU - Appel, L.C.
AU - Arends, E.R.
AU - Carolan, P.G.
AU - Conway, N.J.
AU - Counsell, G.F.
AU - Cunningham, G.
AU - Dnestrovskij, A.
AU - Dnestrovskij, Y.N.
AU - Field, A.R.
AU - Fielding, S.J.
AU - Gryaznevich, M.P.
AU - Korsholm, Søren Bang
AU - Laird, E.
AU - Martin, R.
AU - Nightingale, M.P.S.
AU - Roach, C.M.
AU - Tournianski, M.R.
AU - Walsh, M.J.
AU - Warrick, C.D.
AU - Wilson, H.R.
AU - You, S.
PY - 2001
Y1 - 2001
N2 - MAST is one of the new generation of large, purpose-built spherical tokamaks (STs) now becoming operational, designed to investigate the properties of the ST in large, collisionless plasmas. The first six months of MAST operations have been remarkably successful. Operationally, both merging-compression and the more usual solenoid induction schemes have been demonstrated, the former providing over 400 kA of plasma current with no demand on solenoid flux. Good vacuum conditions and operational conditions, particularly after boronization in trimethylated boron, have provided plasma current of over 1 MA with central plasma temperatures (ohmic) of order I keV. The Hugill and Greenwald limits can be exceeded and H mode achieved at modest additional NBI power. Moreover, particle and energy confinement show an immediate increase at the L-H transition, unlike the case of START, where this became apparent only at the highest plasma currents. Halo currents are small, with low toroidal peaking factors, in accordance with theoretical predictions, and there is evidence of a resilience to the major disruption.
AB - MAST is one of the new generation of large, purpose-built spherical tokamaks (STs) now becoming operational, designed to investigate the properties of the ST in large, collisionless plasmas. The first six months of MAST operations have been remarkably successful. Operationally, both merging-compression and the more usual solenoid induction schemes have been demonstrated, the former providing over 400 kA of plasma current with no demand on solenoid flux. Good vacuum conditions and operational conditions, particularly after boronization in trimethylated boron, have provided plasma current of over 1 MA with central plasma temperatures (ohmic) of order I keV. The Hugill and Greenwald limits can be exceeded and H mode achieved at modest additional NBI power. Moreover, particle and energy confinement show an immediate increase at the L-H transition, unlike the case of START, where this became apparent only at the highest plasma currents. Halo currents are small, with low toroidal peaking factors, in accordance with theoretical predictions, and there is evidence of a resilience to the major disruption.
KW - Optik og sensorsystemer
U2 - 10.1088/0029-5515/41/10/310
DO - 10.1088/0029-5515/41/10/310
M3 - Journal article
SN - 0029-5515
VL - 41
SP - 1423
EP - 1433
JO - Nuclear Fusion
JF - Nuclear Fusion
IS - 10
ER -