Experimental investigation of L- and H-mode detachment via the divertor Thomson scattering at ASDEX Upgrade

Nuclear Fushion

article

M. Cavedon¹  B. Kurzan²  M. Bernert²  D. Brida²  R. Dux²  M. Griener²  S. Henderson³  E. Huett²  T. Nishizawa²  T. Lunt²  O. Pan²  U. Stroth²  M. Wischmeier²  E. Wolfrum²  the ASDEX Upgrade Team² 

[1] Dipartimento di Fisica ‘G. Occhialini’, Università di Milano-Bicocca;Max Planck Institute for Plasma Physics;Culham Science Centre;Physik-Department E28, Technische Universität München

关键词: divertor;    detachment;    divertor Thomson scattering;    L-mode;    H-mode;   

DOI  :  10.1088/1741-4326/ac6071

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The capabilities of the newly installed divertor Thomson Scattering (DTS) diagnostic (Kurzanet al2021J. Inst.16C09012) at ASDEX Upgrade (AUG) have been demonstrated by measuring 2D electron densitiesn _e and temperaturesT _e from attached to fully detached divertor conditions in L- and H-mode. The collected dataset is a breakthrough for divertor studies at AUG in which such measurements have been so far missing. Besides highlighting the strengths and limits of the DTS system, this work provides confirmations and new insights into detachment physics. The transition between partial and pronounced detachment correlates with a 2D redistribution of the electron density from the inner to the outer divertor in both L- and H-mode. In pronounced detachment, a strong parallel pressure gradient could be confirmed throughout the complete SOL. Finally, measurements ofn _e andT _e of a stable X-point radiator revealed local temperatures as low as 1 eV within the confined plasma, whereas the pressure is shown to be constant on closed field lines.

【 授权许可】

Unknown