scholarly journals MEASUREMENT OF EDGE PLASMA PARAMETERS AND THEIR ELECTROSTATIC FLUCTUATIONS ON THE HT-7 SUPERCONDUCTING TOKAMAK

2001 ◽  
Vol 50 (8) ◽  
pp. 1521
Author(s):  
WANG WEN-HAO ◽  
YU CHANG-XUAN ◽  
XU YU-HONG ◽  
WEN YI-ZHI ◽  
LING BI-LI ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Parameters ◽  
Electrostatic Fluctuations ◽  
Superconducting Tokamak

The role of edge plasma parameters in H-mode density limit on the JET-ILW

2021 ◽  
Vol 61 (6) ◽  
pp. 066009
Author(s):  
H.J. Sun ◽  
R.J. Goldston ◽  
A. Huber ◽  
X.Q. Xu ◽  
J. Flanagan ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Parameters ◽  
Density Limit

Scaling study of edge plasma parameters using a multi-device database

1995 ◽  
Vol 220-222 ◽  
pp. 672-676 ◽  
Author(s):  
H.Y.W. Tsui ◽  
W.H. Miner ◽  
A.J. Wootton
Keyword(s):  
Edge Plasma ◽  
Plasma Parameters

scholarly journals ELECTROSTATIC FLUCTUATIONS AND TURBULENT TRANSPORT STUDIES IN THE HT-7 SUPERCONDUCTING TOKAMAK EDGE PLASMAS 

2001 ◽  
Vol 50 (10) ◽  
pp. 1956
Author(s):  
WANG WEN-HAO ◽  
XU YU-HONG ◽  
YU CHANG-XUAN ◽  
WEN YI-ZHI ◽  
LING BI-LI ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Transport Studies ◽  
Electrostatic Fluctuations ◽  
Tokamak Edge ◽  
Edge Plasmas ◽  
Superconducting Tokamak

A study of exhaust and edge plasma parameters in the START tokamak

1995 ◽  
Vol 220-222 ◽  
pp. 658-662 ◽  
Author(s):  
S.K. Erents ◽  
D.H.J. Goodall ◽  
J.G. Ferreira ◽  
A. Sykes ◽  
R. Martin ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Parameters

Novel advanced Gundestrup-like probe for the measurements of flows and edge plasma parameters in TEXTOR

2006 ◽  
Vol 77 (10) ◽  
pp. 10E710 ◽  
Author(s):  
P. Peleman ◽  
S. Jachmich ◽  
Y. Xu ◽  
C. Boucher ◽  
G. Van Oost ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Plasma Parameters

Radial structure of electron drift waves and anomalous transport in the edge plasma

1999 ◽  
Vol 77 (2) ◽  
pp. 113-126
Author(s):  
J LV Lewandowski
Keyword(s):  
Edge Plasma ◽  
Tokamak Plasma ◽  
Medium Size ◽  
Drift Waves ◽  
Electron Drift ◽  
Plasma Parameters ◽  
Mode Amplitude ◽  
Radial Structure ◽  
Density Scale ◽  
Toroidal Geometry

The radial structure of electron drift waves in a low-pressure tokamak plasma is presented. The ions are cold and an electrostatic approximation for the fluctuating potential is used. It is shown that the problem of the radial structure of drift waves in toroidal geometry is amenable to a two-step solution; in first approximation, the radial structure of the mode is neglected and the problem to be solved is the usual eigenmode equation along the (extended) poloidal angle; in second approximation, the mode amplitude is expanded in ascending powers of the parameter (k⊥Ln)-1/2 , where k⊥ is the magnitude of the lowest-order wavevector and Ln is the radial density scale length. It is shown that the radial structure of drift-type modes can depend strongly on the magnetic shear and the scalar magnetic curvature. Numerical calculations for plasma parameters relevant to the edge region of medium-size tokamaks are presented. PACS Nos.: 52.35Kt, 52.30Jb, and 52.35Ra

scholarly journals Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4524
Author(s):  
Codrina Ionita ◽  
Roman Schrittwieser ◽  
Guosheng Xu ◽  
Ning Yan ◽  
Huiqian Wang ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Diagnostic Tools ◽  
Medium Size ◽  
Plasma Parameters ◽  
Republic Of China ◽  
Nano Crystalline ◽  
Laboratory Plasmas ◽  
Probe Material ◽  
Harmful Effects ◽  
Subsequent Risk

Plasma probes are simple and inexpensive diagnostic tools for fast measurements of relevant plasma parameters. While in earlier times being employed mainly in relatively cold laboratory plasmas, plasma probes are now routinely used even in toroidal magnetic fusion experiments, albeit only in the edge region, i.e., the so-called scrape-off layer (SOL), where temperature and density of the plasma are lower. To further avoid overheating and other damages, in medium-size tokamak (MST) probes are inserted only momentarily by probe manipulators, with usually no more than a 0.1 s per insertion during an average MST discharge of a few seconds. However, in such hot and high-density plasmas, their usage is limited due to the strong particle fluxes onto the probes and their casing which can damage the probes by sputtering and heating and by possible chemical reactions between plasma particles and the probe material. In an attempt to make probes more resilient against these detrimental effects, we tested two graphite probe heads (i.e., probe casings with probes inserted) coated with a layer of electrically isolating ultra-nano-crystalline diamond (UNCD) in the edge plasma region of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People’s Republic of China. The probe heads, equipped with various graphite probe pins, were inserted frequently even into the deep SOL up to a distance of 15 mm inside the last closed flux surface (LCFS) in low- and high-confinement regimes (L-mode and H-mode). Here, we concentrate on results most relevant for the ability to protect the graphite probe casings by UNCD against harmful effects from the plasma. We found that the UNCD coating also prevented almost completely the sputtering of graphite from the probe casings and thereby the subsequent risk of re-deposition on the boron nitride isolations between probe pins and probe casings by a layer of conductive graphite. After numerous insertions into the SOL, first signs of detachment of the UNCD layer were noticed.

scholarly journals Edge plasma parameters affecting fast wave and slow wave intensities in scrape off layer

2020 ◽  
Author(s):  
L. Ai ◽  
L. N. Liu ◽  
C. M. Qin ◽  
X. J. Zhang ◽  
Y. P. Zhao
Keyword(s):  
Slow Wave ◽  
Edge Plasma ◽  
Fast Wave ◽  
Plasma Parameters
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