L-H transition studies in tritium and deuterium–tritium campaigns at JET with Be wall and W divertor

Nuclear Fushion

article

J. Hall¹  A. Ho²  L.D. Horton³  L. Horvath³  P. Jacquet³  I. Jepu³  E. Joffrin⁵  A. Kappatou⁶  D.L. Keeling³  D.B. King³  V.G. Kiptily³  K.K. Kirov³  D. Kos³  E. Kowalska-Strzęciwilk⁷  M. Lennholm³  E. Lerche³  E. Litherland-Smith³  A. Loarte^1,10  B. Lomanowski^1,11  P.J. Lomas³  C.F. Maggi³  J. Mailloux³  M.J. Mantsinen^1,12  M. Maslov³  A.G. Meigs³  I. Monakhov³  R.B. Morales³  A.H. Nielsen^1,13  D. Nina^1,14  C. Noble³  E. Pawelec^1,15  M. Poradzinski³  G. Pucella^1,16  P. Puglia³  D. Réfy^1,17  J. Juul Rasmussen^1,13  E.R. Solano^1,18  G. Birkenmeier^1,19  C. Silva^1,14  E. Delabie^1,11  J.C. Hillesheim³  A. Baciero^1,18  I. Balboa³  M. Baruzzo^2,20  A. Boboc³  M. Brix³  J. Bernardo³  C. Bourdelle⁵  I.S. Carvalho^1,14  P. Carvalho^1,14  C.D. Challis³  M. Chernyshova⁷  A. Chomiczewska⁷  R. Coelho^1,14  I. Coffey^2,21  T. Craciunescu⁴  E. de la Cal^1,18  E. de la Luna^1,18  R. Dumont⁵  P. Dumortier⁹  M. Fontana³  J.M. Fontdecaba^1,18  L. Frassinetti^2,22  D. Gallart^2,23  J. Garcia⁵  C. Giroud³  W. Gromelski⁷  R.B. Henriques^1,14  E. Righi⁸  F.G. Rimini³  T. Robinson³  M. Sertoli³  S.A. Silburn³  G. Sips⁸  P. Sirén³  Ž. Štancar³  H.J. Sun³  G. Szepesi³  D. Taylor³  E. Tholerus³  B. Thomas³  G. Verdoolaege¹  P. Vincenzi^2,20  B. Viola³  N. Vianello^2,20  T. Wilson³ 

[1] Department of Applied Physics, Ghent University;FOM Institute DIFFER;UKAEA, Culham Science Centre;The National Institute for Laser;CEA;Max-Planck-Institut für Plasmaphysik;Institute of Plasma Physics and Laser Microfusion;European Commission;Laboratory for Plasma Physics LPP-ERM/KMS;ITER Organization;Oak Ridge National Laboratory;ICREA and Barcelona Supercomputing Center;Department of Physics, Technical University of Denmark;Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa;Institute of Physics, University of Opole;Nuclear Fusion and Safety Department;Centre for Energy Research;Laboratorio Nacional de Fusión;Physik-Department E28, Technische Universität München;Consorzio RFX ,(CNR, ENEA, INFN, Università di Padova;Astrophysics Research Centre, Queen’s University;Fusion Plasma Physics, EECS, KTH Royal Institute of Technology;Barcelona Supercomputing Center;Slovenian Fusion Association ,(SFA), Jozef Stefan Institute;Institute for Plasma Science and Technology

关键词: L-H transition;    power threshold;    tokamaks;    Tritium;    DT;    JET-ILW;    isotope;   

DOI  :  10.1088/1741-4326/acee12

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The recent deuterium–tritium campaign in JET-ILW (DTE2) has provided a unique opportunity to study the isotope dependence of the L-H power threshold in an ITER-like wall environment (Be wall and W divertor). Here we present results from dedicated L-H transition experiments at JET-ILW, documenting the power threshold in tritium and deuterium–tritium plasmas, comparing them with the matching deuterium and hydrogen datasets. From earlier experiments in JET-ILW it is known that as plasma isotopic composition changes from deuterium, through varying deuterium/hydrogen concentrations, to pure hydrogen, the value of the line averaged density at which the threshold is minimum, {bar n_{{ext{e}},{ext{min}}}} , increases, leading us to expect that {bar n_{{ext{e}},{ext{min}}}} (T) < {bar n_{{ext{e}},{ext{min}}}} (DT) < {bar n_{{ext{e}},{ext{min}}}} (D) < {bar n_{{ext{e}},{ext{min}}}} (H). The new power threshold data confirms these expectations in most cases, with the corresponding ordering of the minimum power thresholds. We present a comparison of this data to power threshold scalings, used for extrapolation to future devices such as ITER and DEMO.

【 授权许可】

Unknown