The spherical tokamak programme at Culham
A. Sykes; the START Team; the NBI Team; the MAST Team; the Theory Team; A. Sykes; Euratom-UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, United Kingdom; the START Team; Euratom-UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, United Kingdom; the NBI Team; Euratom-UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, United Kingdom; the MAST Team; Euratom-UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, United Kingdom; the Theory Team; Euratom-UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, United Kingdom
Журнал:
Nuclear Fusion
Дата:
1999-09-01
Аннотация:
The spherical tokamak (ST) is the low aspect ratio limit of the conventional tokamak and appears to offer attractive physics properties in a simpler device. The START (Small Tight Aspect Ratio Tokamak) experiment provided the world's first demonstration of the properties of hot plasmas in an ST configuration and was operational at Culham from January 1991 to March 1998, obtaining plasma currents of up to 300 kA and pulse durations of ∼50 ms. Its successor, MAST, is nearing completion and is a purpose built, high vacuum machine designed to have a tenfold increase in plasma volume with plasma currents of up to 2 MA. Current drive and heating will be by a combination of induction-compression as on START, a high performance central solenoid, with 1.5 MW ECRH and 5 MW of NBI. The promising results from START are reviewed, and the many challenges posed for the next generation of purpose built STs (such as MAST) are described.
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