scholarly journals Behavior of the particle transport coefficients near the density limit in MTX

1993 ◽  
Author(s):  
Michael Martin Marinak
Keyword(s):  
Particle Transport ◽  
Transport Coefficients ◽  
Density Limit

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.

scholarly journals Edge shear flows and particle transport near the density limit of the HL-2A tokamak

2017 ◽  
Vol 58 (1) ◽  
pp. 016041 ◽  
Author(s):  
R. Hong ◽  
G.R. Tynan ◽  
P.H. Diamond ◽  
L. Nie ◽  
D. Guo ◽  
...  
Keyword(s):  
Particle Transport ◽  
Shear Flows ◽  
Density Limit

Determination of particle transport coefficients in ASDEX by gas modulation

1992 ◽  
Vol 32 (2) ◽  
pp. 217-237 ◽  
Author(s):  
K.W Gentle ◽  
O Gehre ◽  
K Krieger
Keyword(s):  
Particle Transport ◽  
Transport Coefficients

scholarly journals Evidence of a thermo-diffusion pinch on particle transport in FTU discharges close to density limit

2017 ◽  
Vol 12 ◽  
pp. 622-626
Author(s):  
O. Tudisco ◽  
C. Meineri ◽  
G. Apruzzese ◽  
O. D’Arcangelo ◽  
E. Giovannozzi ◽  
...  
Keyword(s):  
Particle Transport ◽  
Density Limit

Enhanced particle transport events approaching the density limit of the J-TEXT tokamak

2021 ◽  
Author(s):  
Ting Long ◽  
Patrick H Diamond ◽  
Rui Ke ◽  
Lin Nie ◽  
Min Xu ◽  
...  
Keyword(s):  
Particle Transport ◽  
Density Limit

Measurement of electron particle transport coefficients in different operational modes of DIII-D

1998 ◽  
Vol 38 (4) ◽  
pp. 485-494 ◽  
Author(s):  
D.R Baker ◽  
M.R Wade ◽  
G.L Jackson ◽  
R Maingi ◽  
R.E Stockdale ◽  
...  
Keyword(s):  
Particle Transport ◽  
Transport Coefficients ◽  
Operational Modes

Measurements of particle transport coefficients using supersonic molecular beam injection modulation on EAST

2019 ◽  
Vol 26 (5) ◽  
pp. 052515
Author(s):  
S. X. Wang ◽  
H. Q. Liu ◽  
Y. X. Jie ◽  
E. H. Wang ◽  
L. Zeng ◽  
...  
Keyword(s):  
Particle Transport ◽  
Molecular Beam ◽  
Transport Coefficients ◽  
Supersonic Molecular Beam ◽  
Beam Injection

Measurements of the electron source distribution and particle transport coefficients in JET

1993 ◽  
Vol 35 (5) ◽  
pp. 585-594 ◽  
Author(s):  
J O'Rourke ◽  
C Gowers ◽  
G J Kramer ◽  
P D Morgan ◽  
R Simonini ◽  
...  
Keyword(s):  
Particle Transport ◽  
Transport Coefficients ◽  
Electron Source ◽  
Source Distribution
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