scholarly journals Neutral depletion and the helicon density limit

2013 ◽  
Vol 20 (12) ◽  
pp. 123511 ◽  
Author(s):  
R. M. Magee ◽  
M. E. Galante ◽  
J. Carr ◽  
G. Lusk ◽  
D. W. McCarren ◽  
...  
Keyword(s):  
Density Limit ◽  
Neutral Depletion

Review and present status of the TEXTOR radiative improved (RI) mode

1998 ◽  
Vol 59 (4) ◽  
pp. 587-610 ◽  
Author(s):  
P. E. VANDENPLAS ◽  
A. M. MESSIAEN ◽  
J. P. H. E. ONGENA ◽  
U. SAMM ◽  
B. UNTERBERG
Keyword(s):  
Density Profile ◽  
High Power ◽  
Present Status ◽  
Particle Transport ◽  
Density Limit ◽  
Radiated Power ◽  
Edge Radiation ◽  
Intermediate Size ◽  
Power Fraction ◽  
Better Than

From 1990, the boronized TEXTOR tokamak was characterized by an improved confinement (coined the ‘I mode’) at high power that was substantially better than the L mode, but densities had to be limited to n[bar]e0/nGR[lsim ]0.5–0.6, where nGR is the Greenwald density limit. With the injection of Ne, Si or Ar in order to increase the edge radiation and provided that γ=Prad/Ptot[greater, similar]0.5, PNBI-co/Ptot[greater, similar]0.25 and n[bar]e0/nGR[greater, similar]0.75, a further improved confinement called the radiative improved mode (RI mode) was discovered in 1993 on TEXTOR, a tokamak of intermediate size, and confirmed on TEXTOR-94. The radiated power fraction γ can reach 0.9, and the radiation is nearly isotropically distributed over the torus wall. The RI mode is characterized by its ability to obtain simultaneously and stationarily high densities and high confinement. It is linked to a substantial lowering of edge ne, Te and Ti, a reduction in particle transport and a peaking of the density profile. The RI-mode confinement scales on TEXTOR as τE= (n[bar]e0/nGR)τITERH93-P and values up to n[bar]e0/nGR≈1.2 are obtained. There is no detrimental concentration of the seeded impurity at the centre of the plasma. Results of three different interpretative and modelling approaches are in agreement with the improved confinement features; the preliminary indications are that ITG turbulence is strongly reduced. The Z mode observed on ISX-B has a clear resemblance to the RI mode. The very favourable features of the RI mode justify efforts in trying to establish it on larger machines to verify if the present scaling then holds.

Thermal transport catastrophe and the tokamak edge density limit

2006 ◽  
Vol 13 (6) ◽  
pp. 062503 ◽  
Author(s):  
D. A. D’Ippolito ◽  
J. R. Myra
Keyword(s):  
Thermal Transport ◽  
Edge Density ◽  
Density Limit ◽  
Tokamak Edge

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

Coupling of internal m=1 and m=2 modes at density limit disruptions in the T-10 tokamak

1994 ◽  
Vol 34 (3) ◽  
pp. 317-336 ◽  
Author(s):  
P.V Savrukhin ◽  
E.S Lyadina ◽  
D.A Martynov ◽  
D.A Kislov ◽  
V.I Poznyak
Keyword(s):  
Density Limit

scholarly journals Correlation energy of two electrons in the high-density limit

2009 ◽  
Vol 131 (24) ◽  
pp. 241101 ◽  
Author(s):  
Pierre-François Loos ◽  
Peter M. W. Gill
Keyword(s):  
Correlation Energy ◽  
High Density ◽  
Density Limit
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