Fast imaging of edge localized mode structure and dynamics in DIII-D

2008 ◽  
Vol 15 (3) ◽  
pp. 032504 ◽  
Author(s):  
J. H. Yu ◽  
J. A. Boedo ◽  
E. M. Hollmann ◽  
R. A. Moyer ◽  
D. L. Rudakov ◽  
...  
Keyword(s):  
Fast Imaging ◽  
Mode Structure ◽  
Structure And Dynamics ◽  
Edge Localized Mode ◽  
Localized Mode

scholarly journals Structure and dynamical steady state of the peeling mode in edge-localized mode-free, high-confinement tokamak plasmas

2021 ◽  
Author(s):  
Kensaku Kamiya ◽  
Kimitaka Itoh ◽  
Nobuyuki Aiba ◽  
Naoyuki Oyama ◽  
Mitsuru Honda ◽  
...  
Keyword(s):  
Steady State ◽  
Direct Evidence ◽  
Limit Cycle Oscillation ◽  
Tokamak Plasmas ◽  
Mode Structure ◽  
Laboratory Plasma ◽  
Edge Localized Mode ◽  
Edge Localized Modes ◽  
Localized Mode ◽  
Cycle Oscillation

Abstract Explosive dynamical events in controlled-nuclear-fusion devices (known as edge-localized modes) display many similarities to solar-flare events on the sun, revealing a new connection between laboratory plasma physics and astronomy. However, to date there has been no direct evidence for the peeling mode structure, due to the lack of decisive diagnostics. Here we report the first evidence for the structure and dynamical steady state of a peeling mode for low-n edge-harmonic oscillations (EHOs) in the quiescent H-mode. EHOs are dominated by the fundamental mode (1fEHO) at both the low- and high-field sides. 1fEHO edge perturbations are confirmed to have kink parity and exhibit the frozen-in-condition predicted by a linear stability analysis. The envelope signal of the 1fEHO mode exhibits repeated cycles of growth and damping to the order of a few hundred Hz associated with small changes in an edge gradient, and results are quantitatively consistent with a limit-cycle-oscillation model.

scholarly journals Relationship of edge localized mode burst times with divertor flux loop signal phase in JET

2014 ◽  
Vol 21 (6) ◽  
pp. 062302 ◽  
Author(s):  
S. C. Chapman ◽  
R. O. Dendy ◽  
T. N. Todd ◽  
N. W. Watkins ◽  
A. J. Webster ◽  
...  
Keyword(s):  
Signal Phase ◽  
Edge Localized Mode ◽  
Localized Mode ◽  
Relationship Of

scholarly journals Edge-localized mode dynamics and transport in the scrape-off layer of the DIII-D tokamak

2005 ◽  
Vol 12 (7) ◽  
pp. 072516 ◽  
Author(s):  
J. A. Boedo ◽  
D. L. Rudakov ◽  
E. Hollmann ◽  
D. S. Gray ◽  
K. H. Burrell ◽  
...  
Keyword(s):  
Edge Localized Mode ◽  
Localized Mode

Physical design of a new set of high poloidal mode number coils in the EAST tokamak

2022 ◽  
Author(s):  
Liang Liao ◽  
Yunfeng Liang ◽  
Shaocheng Liu ◽  
Huaxiang Zhang ◽  
Xiang Ji ◽  
...  
Keyword(s):  
Magnetic Topology ◽  
Magnetic Perturbation ◽  
Perturbation Field ◽  
Low Field ◽  
Flexible Working ◽  
Magnetic Spectrum ◽  
Edge Localized Mode ◽  
Field Edge ◽  
Localized Mode ◽  
Spectrum Characteristic

Abstract An external resonant magnetic perturbation (RMP) field, an effective method to mitigate or suppress the edge localized mode (ELM), has been planned to be applied on the ELM control issue in ITER. A new set of magnetic perturbation coils, named as high m coils, has been developed for the EAST tokamak. The magnetic perturbation field of the high m coils is localized in the midplane of the low field side (LFS), with a spectrum characteristic of high m and wide n, where m and n are the poloidal and toroidal mode numbers, respectively. The high m coils generates a strong localized perturbation field. Edge magnetic topology under the application of high m coils should have either a small or no stochastic region. With the combination of the high m coils and the current RMP coils, flexible working scenarios of the magnetic perturbation field are available, which is beneficial for ELM control exploration on EAST. Numerical simulations have been carried out to characterize the high m coil system, including the magnetic spectrum and magnetic topology, which shows a great flexibility of magnetic perturbation variation as a tool to investigate the interaction between ELM and external magnetic perturbation.

Direct evidence of E × B flow changes at the onset of resonant magnetic perturbation-driven edge-localized mode crash suppression

2019 ◽  
Vol 59 (6) ◽  
pp. 066033 ◽  
Author(s):  
Jaehyun Lee ◽  
Y.M. Jeon ◽  
Y. In ◽  
G.Y. Park ◽  
G.S. Yun ◽  
...  
Keyword(s):  
Direct Evidence ◽  
Magnetic Perturbation ◽  
Edge Localized Mode ◽  
Localized Mode ◽  
Flow Changes

Density pump-out compensation during type-I edge localized mode control experiments withn= 1 perturbation fields on JET

2011 ◽  
Vol 53 (8) ◽  
pp. 085009 ◽  
Author(s):  
S Saarelma ◽  
A Alfier ◽  
Y Liang ◽  
L Frassinetti ◽  
M Beurskens ◽  
...  
Keyword(s):  
Type I ◽  
Mode Control ◽  
Edge Localized Mode ◽  
Localized Mode

Reduced Heat Transport between Edge-Localized-Mode Bursts at Low Collisionality and Small Poloidal Larmor Radius

2005 ◽  
Vol 95 (3) ◽  
Author(s):  
H. Urano ◽  
T. Takizuka ◽  
Y. Kamada ◽  
N. Oyama ◽  
H. Takenaga ◽  
...  
Keyword(s):  
Heat Transport ◽  
Larmor Radius ◽  
Edge Localized Mode ◽  
Localized Mode
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