First neutral beam experiments on Wendelstein 7-X

Nuclear Fushion

article

Hannes Damm¹  Golo Fuchert¹  Philipp Nelde¹  Evan Scott²  Novimir Pablant³  Andreas Langenberg¹  Peter Traverso⁴  Pranay Valson¹  Uwe Hergenhahn¹  Andrea Pavone¹  Kian Rahbarnia¹  Tamara Andreeva¹  Jonathan Schilling¹  Christian Brandt¹  Ulrich Neuner¹  Henning Thomsen¹  Neha Chaudhary¹  Udo Höefel¹  Torsten Stange¹  Gavin Weir¹  Nikolai Marushchenko¹  Marcin Jakubowski¹  Adnan Ali¹  Yu Gao¹  Holger Niemann¹  Aleix Puig Sitjes¹  Ralf Koenig¹  Ralf Schroeder¹  Niek den Harder¹  Bernd Heinemann¹  Christian Hopf¹  Rudolf Riedl¹  Robert C. Wolf¹  Samuel A. Lazerson¹  Oliver Ford¹  Simppa Äkaslompolö⁵  Sergey Bozhenkov¹  Christoph Slaby¹  Lilla Vanó¹  Annabelle Spanier¹  Paul McNeely¹  Norbert Rust¹  Dirk Hartmann¹  Peter Poloskei¹  Birger Buttenschoゆ¹  Rainer Burhenn¹  Naoki Tamura⁶  Rene Bussiahn¹  Thomas Wegner¹  Michael Drevlak¹  Yuriy Turkin¹  Kunihiro Ogawa⁶  Jens Knauer¹  Kai Jakob Brunner¹  Ekkehard Pasch¹  Marc Beurskens¹ 

[1] Max-Planck-Institut für Plasmaphysik;University of Wisconsin;Princeton Plasma Physics Laboratory, 08543 Princeton;Auburn University;Aalto University;National Institute for Fusion Science

关键词: stellarator;    fast ions;    energetic particles;    neutral beam;    fusion;   

DOI  :  10.1088/1741-4326/ac121c

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In the previous divertor campaign, the Wendelstein 7-X (W7-X) device injected 3.6 MW of neutral beam heating power allowing for the achievement of densities approaching 2×10²⁰ m⁻³, and providing the first initial assessment of fast ion confinement in a drift optimized stellarator. The neutral beam injection (NBI) system on W7-X is comprised of two beam boxes with space for four radio frequency sources each. The 3.6 MW of heating reported in this work was achieved with two sources in the NI21 beam box. The effect of combined electron-cyclotron resonance heating (ECRH) and NBI was explored through a series of discharges varying both NBI and ECRH power. Discharges without ECRH saw a linear increase in the line-integrated plasma density, and strong peaking of the core density, over the discharge duration. The presence of 1 MW of ECRH power was found to be sufficient to control a continuous density rise during NBI operation. Simulations of fast ion wall loads were found to be consistent with experimental infrared camera images during operation. In general, NBI discharges were free from the presence of fast ion induced Alfvénic activity, consistent with low beam betas. These experiments provide data for future scenario development and initial assessment of fast-ion confinement in W7-X, a key topic of the project.

【 授权许可】

Unknown