Isotope scaling of the H mode power threshold on JET
E. Righi; D.V. Bartlett; J.P. Christiansen; G.D. Conway; J.G. Cordey; L.-G. Eriksson; H.P.L. De Esch; G.M. Fishpool; C.W. Gowers; J.C.M. de Haas; P.J. Harbour; N.C. Hawkes; J. Jacquinot; T.T.C. Jones; W. Kerner; Q.A. King; C.G. Lowry; R.D. Monk; P. Nielsen; F.G. Rimini; G. Saibene; R. Sartori; B. Schunke; A.C.C. Sips; R.J. Smith; M.F. Stamp; D.F.H. Start; K. Thomsen; B.J.D. Tubbing; N. Zornig; E. Righi; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; D.V. Bartlett; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; J.P. Christiansen; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; G.D. Conway; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; J.G. Cordey; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; L.-G. Eriksson; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; H.P.L. De Esch; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; G.M. Fishpool; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; C.W. Gowers; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; J.C.M. de Haas; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; P.J. Harbour; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; N.C. Hawkes; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; J. Jacquinot; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; T.T.C. Jones; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; W. Kerner; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; Q.A. King; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; C.G. Lowry; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; R.D. Monk; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; P. Nielsen; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; F.G. Rimini; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; G. Saibene; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; R. Sartori; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; B. Schunke; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; A.C.C. Sips; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; R.J. Smith; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; M.F. Stamp; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; D.F.H. Start; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; K. Thomsen; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; B.J.D. Tubbing; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom; N. Zornig; JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom
Журнал:
Nuclear Fusion
Дата:
1999-03-01
Аннотация:
Results are presented from a series of dedicated experiments carried out on JET in tritium, DT, deuterium and hydrogen plasmas to determine the dependence of the H mode power threshold on the plasma isotopic mass. The P<sub>thr</sub> ∝ A<sub>eff</sub><sup>-1</sup> scaling is established over the whole isotopic range. This result makes it possible for a fusion reactor with a 50:50 DT mixture to access the H mode regime with about 20% less power than that needed in a DD mixture. Results on the first systematic measurements of the power necessary for the transition of the plasma to the type I ELM regime, which occurs after the transition to H mode, are also in agreement with the A<sub>eff</sub><sup>-1</sup> scaling. For a subset of discharges, measurements of T<sub>e</sub> and T<sub>i</sub> at the top of the profile pedestal have been obtained, indicating a weak influence of the isotopic mass on the critical edge temperature thought to be necessary for the H mode transition.
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