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A design for a high performance, long pulse tokamak (HLT) is proposed. The main parameters of the machine are major radius 3.4 m, minor radius 1.2 m, elongation 2. The maximum toroidal field on axis is 8.3 T and the maximum plasma current is 20 MA. The discharge flat top length is 40 s for a plasma with 20 MA inductively driven current at a toroidal field of 8.0 T, and 500 s for a discharge with 7 MA non-inductively driven current at a field of 3.5 T. In HLT the main physics issues for a fusion reactor can be assessed: plasma physics and plasma operation in the ignited and sub-ignited regimes; burn stabilisation; behaviour of divertor components under long-pulse thermal loads; and semi-continuous operation with non-inductive current drive. The crucial element in obtaining this level of performance in a machine of medium size is the use of active cooling with liquid nitrogen for both the toroidal field coils and the central solenoid. The toroidal field coils have a pure copper conductor in a stainless steel casing. The stress in the copper does not exceed a relatively conservative limit of 180 MPa.

Additional information

Authors: TANGA A, ENEA, Centro Ricerche Energia Frascati, Roma (IT);ROCCELLA M, ENEA, Centro Ricerche Energia Frascati, Roma (IT);TUBBING B J D, JET Joint Undertaking, Abingdon, Oxon. (GB);SACK C H, JET Joint Undertaking, Abingdon, Oxon. (GB);BOSIA G, CEC Bruxelles (BE);SBORCHIA C, ANSALDO Ricerche, Genova (IT)
Bibliographic Reference: Report: RT/NUCL/90/48 EN (1991) 61 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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