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  • SUMMARY OF THE COURSE ON TOKAMAK START-UP. PROBLEMS AND SCENARIOS RELATED TO THE TRANSIENT PHASES OF A THERMONUCLEAR FUSION REACTOR, ERICE, SICILY, JULY 14-20, 1985

Abstract

While the total pulse length in the NET/FER tokamak generation (with all its consequences) should be much longer than in preceding devices (of order 1000 s), the start-up conditions will be relatively close to those obtained in the presently operating large devices. On the basis of the experience gained in JET, TFTR, and other large tokamaks, one could conclude that the plasma formation and inductive current ramp-up (including impurity control in these substages) are not likely to present serious problems when extended to the large tokamaks of the future. Non-inductive current drive is still too inefficient by at least a factor of about 5 to be of interest in the burn phase of NET/FER or the DEMO reactor. Instead, non-inductive current drive in the context of a hybrid operation scenario is considered to be useful in assisting the current initiation (to save inductive volt-seconds) and, possibly, for maintaining the current during transformer recharging (while during the burn the current is driven inductively). However, in these non-inductive current drive phases, which are necessarily operated at relatively low plasma densities, there is a high risk of plasma contamination. Then, reaching the steady burn phase implies, of course, mastering the physical and technical problems of heating, containing, and controlling the thermonuclear plasma + but these were not main topics of discussion at this course.

Additional information

Authors: KNOEPFEL H ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY), ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY)
Bibliographic Reference: FUSION TECHNOLOGY, VOL. 9 (1986), PP. 510-513
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