Speaker
Mr
Manuel Garcia-Munoz
(Germany)
Description
The impact of Edge Localized Modes (ELMs) and externally applied resonant and non-resonant Magnetic Perturbations (MPs) on fast-ion confinement / transport has been investigated in the ASDEX Upgrade, DIII-D and KSTAR tokamaks. These studies were enabled by coordinated multi-machine experiments and new diagnostic capabilities that provide detailed experimental results of the interaction between energetic particles and instabilities in particle phase-space. New findings include: bursts of fast-ion losses induced by ELMs dominate the losses in H-mode plasmas as measured by fast-ion loss detectors (FILDs) at different toroidal and poloidal positions; in low-collisionality H-modes, ELM and inter-ELM fluctuations in fast-ion losses appear often strongly connected with main ELM properties and edge flows; filamentary fast-ion losses are observed during ELMs suggesting a strong interaction between fast-ions and the instabilities concomitant to the ELM blobs and filaments; large changes in escaping-ion phase-space are observed within single ELMs; during the mitigation / suppression of type-I ELMs by externally applied MPs, the large fast-ion blobs / filaments observed during ELMs are replaced by a loss of fast-ions with a broad-band frequency and an amplitude of up to 6 times higher than the NBI prompt loss signal without MPs; a clear synergy in the overall fast-ion transport is observed between edge perturbations and internal MHD fluctuations such as Alfven Eigenmodes (AEs) and sawteeth. Measured fast-ion losses are typically on banana orbits that explore the entire pedestal / Scrape-Off-Layer (SOL). A systematic study of the observed fast-ion losses induced ELMs (mitigated and not-mitigated) and MPs as a function of the MP configuration and magnitude will be presented together with F3D-OFMC and ASCOT simulations of the MP induced fast-ion losses.
Collaboration (if applicable, e.g., International Tokamak Physics Activities)
multi-machine contribution: AUG, DIII-D and KSTAR
Country or International Organization of Primary Author
Germany
Primary author
Mr
Manuel Garcia-Munoz
(Germany)
Co-authors
Mr
B. Geiger
(IPP)
Dr
D. Pace
(General Atomics)
Dr
E. Wolfrum
(IPP)
Dr
G. D. Conway
(IPP)
Dr
G. I. Pokol
(Budapest University of Technology)
Dr
H. Park
(POSTECH)
Dr
I. G. J. Classen
(FOM Institute DIFFER)
Mr
J. Boom
(FOM Institute DIFFER)
Dr
J. Kim
(NFRI)
Dr
J. Y. Kim
(NFRI & University of Science and Technology - Daejeon)
Dr
K. Shinohara
(JAEA)
Dr
M. A. Van Zeeland
(General Atomics)
Dr
M. Maraschek
(IPP)
Mr
M. Willensdorfer
(Technische Universitaet Wien)
Ms
N. Lazanyi
(Budapest University of Technology)
Dr
N. Luhman
(University of California - Davis)
Mr
O. Asunta
(Aalto University)
Dr
R. K. Fisher
(General Atomics)
Mr
S. Akaslampolo
(Aalto University)
Dr
T. Happel
(IPP)
Dr
T. Kurki-Suonio
(Aalto University)
Dr
T. L. Rhodes
(Universiy of California - Los Angeles)
Dr
T. Lunt
(IPP)
Dr
V. Igochine
(IPP)
Dr
W. Suttrop
(IPP)
Prof.
W. W. Heidbrink
(University of California - Irvine)
Dr
X. Chen
(University of California - Irvine)
