Experimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X

TitleExperimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X
Publication TypeJournal Article
Year of Publication2022
AuthorsT.S. Pedersen, I. Abramovic, P. Agostinetti, A Torres, S. Akaslompolo, A Belloso, P. Aleynikov, K. Aleynikova, M.J. Pueschel, MR de Baar, M. Alhashimi, A. Ali, N. Allen, A. Alonso, G. Anda, T. Andreeva, C. Angioni, A. Arkhipov, A. Arnold, W. Asad, E. Ascasibar, M.H. Aumeunier, K. Avramidis, E. Aymerich, S.G. Baek, J. Baehner, A. Baillod, M. Balden, J. Baldzuhn, S. Ballinger, M. Banduch, S. Bannmann, B A. Navarro, T. Barbui, C. Beidler, C. Belafdil, A. Bencze, A. Benndorf, M. Beurskens, C. Biedermann, O. Biletskyi, B. Blackwell, M. Blatzheim, T. Bluhm, D. Bockenhoff, G. Bongiovi, M. Borchardt, D. Borodin, J. Boscary, H.S. Bosch, T. Bosmann, B. Böswirth, L. Bottger, A. Bottino, S. Bozhenkov, R. Brakel, C. Brandt, S. Brezinsek, J. Hawke, D. Moseev, M. Schneider, P. Schneider, T. Szepesi, E. Wang, H. Wang, et al., H. Zohm, S. Zoletnik, L. Zsuga
JournalNuclear Fusion
Volume62
Issue4
Pagination042022
Abstract

We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been maintained for tens of seconds. Pellet fueling allows for plasma phases with reduced ion-temperature-gradient turbulence, and during such phases, the overall confinement is so good (energy confinement times often exceeding 200 ms) that the attained density and temperature profiles would not have been possible in less optimized devices, since they would have had neoclassical transport losses exceeding the heating applied in W7-X. This provides proof that the reduction of neoclassical transport through magnetic field optimization is successful. W7-X plasmas generally show good impurity screening and high plasma purity, but there is evidence of longer impurity confinement times during turbulence-suppressed phases.

DOI10.1088/1741-4326/ac2cf5
Division

FP

Department

PMT

PID

77129c7d0f4c8ed6594e7e3ae46dd8c8

Alternate TitleNucl. Fusion
LabelOA

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