scholarly journals Impurity Transport in Reversed Shear and ELMy H-Mode Plasmas of JT-60U

1999 ◽  
Vol 75 (8) ◽  
pp. 952-966 ◽  
Author(s):  
Hidenobu TAKENAGA ◽  
Akira SAKASAI ◽  
Yoshihiko KOIDE ◽  
Yoshiteru SAKAMOTO ◽  
Hirotaka KUBO ◽  
...  
Keyword(s):  
Impurity Transport ◽  
Reversed Shear

Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Germán Vogel ◽  
Hongming Zhang ◽  
Yongcai Shen ◽  
Shuyu Dai ◽  
Youwen Sun ◽  
...  
Keyword(s):  
Inner Core ◽  
Extreme Ultraviolet ◽  
Transport Coefficients ◽  
Three Dimensional ◽  
Line Emission ◽  
Core Region ◽  
Emission Mitigation ◽  
One Dimensional ◽  
Impurity Transport ◽  
Transport Code

Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range in radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study the effects of resonant magnetic perturbations (RMPs) on core impurity accumulation at EAST. The amount of impurity line emission mitigation by RMPs appears to be correlated with the ion Z for lithium, carbon, iron and tungsten monitored, i.e. stronger suppression of accumulation for heavier ions. The targeted effect on the most detrimental high-Z impurities suggests a possible advantage using RMPs for impurity control. Profiles of transport coefficients are calculated with the STRAHL one-dimensional impurity transport code, keeping $\nu /D$ fixed and using the measured spatial profiles of $\textrm{F}{\textrm{e}^{20 + }}$ , $\textrm{F}{\textrm{e}^{21 + }}$ and $\textrm{F}{\textrm{e}^{22 + }}$ to disentangle the transport coefficients. The iron diffusion coefficient ${D_{\textrm{Fe}}}$ increases from $1.0- 2.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ to $1.5- 3.0\;{\textrm{m}^2}\;{\textrm{s}^{ - 1}}$ from the core region to the edge region $(\rho \gt 0.5)$ after the onset of RMPs. Meanwhile, an inward pinch of iron convective velocity ${\nu _{\textrm{Fe}}}$ decreases in magnitude in the inner core region and increases significantly in the outer confined region, simultaneously contributing to preserving centrally peaked $\textrm{Fe}$ profiles and exhausting the impurities. The ${D_{\textrm{Fe}}}$ and ${\nu _{\textrm{Fe}}}$ variations lead to reduced impurity contents in the plasma. The three-dimensional edge impurity transport code EMC3-EIRENE was also applied for a case of RMP-mitigated high-Z accumulation at EAST and compared to that of low-Z carbon. The exhaust of ${\textrm{C}^{6 + }}$ toward the scrape-off layer accompanying an overall suppression of heavier ${\textrm{W}^{30 + }}$ is observed when using RMPs.

Influence of trapped energetic ions on low-frequency magnetohydrodynamic instabilities with reversed shear profile

2021 ◽  
Vol 28 (1) ◽  
pp. 012104
Author(s):  
Baofeng Gao ◽  
Huishan Cai ◽  
Feng Wang ◽  
Xiang Gao ◽  
Yuanxi Wan
Keyword(s):  
Low Frequency ◽  
Energetic Ions ◽  
Reversed Shear

scholarly journals Trace impurity transport in multi-species plasmas with large particle fluxes

2021 ◽  
pp. 127284
Author(s):  
E. Litvinova Mitra ◽  
E.J. Kolmes ◽  
I.E. Ochs ◽  
M.E. Mlodik ◽  
T. Rubin ◽  
...  
Keyword(s):  
Large Particle ◽  
Trace Impurity ◽  
Impurity Transport ◽  
Particle Fluxes

Study of a compact reversed shear Tokamak reactor

1998 ◽  
Vol 41 (1-4) ◽  
pp. 511-517 ◽  
Author(s):  
K Okano ◽  
Y Asaoka ◽  
R Hiwatari ◽  
N Inoue ◽  
Y Murakami ◽  
...  
Keyword(s):  
Tokamak Reactor ◽  
Reversed Shear

Influence of Neutral-Beam Injection on Impurity Transport in the ISX-BTokamak

1981 ◽  
Vol 47 (9) ◽  
pp. 649-652 ◽  
Author(s):  
R. C. Isler ◽  
L. E. Murray ◽  
S. Kasai ◽  
D. E. Arnurius ◽  
S. C. Bates ◽  
...  
Keyword(s):  
Neutral Beam Injection ◽  
Neutral Beam ◽  
Beam Injection ◽  
Impurity Transport

Method to deduce local impurity transport quantities from the evolution of tomographically reconstructed bolometer signals during tracer injection at TJ-II

2004 ◽  
Vol 75 (10) ◽  
pp. 4231-4233 ◽  
Author(s):  
B. Zurro ◽  
M. A. Ochando ◽  
A. Baciero ◽  
K. J. McCarthy ◽  
F. Medina ◽  
...  
Keyword(s):  
Tracer Injection ◽  
Impurity Transport

Effects of Convective Solute and Impurity Transport in Protein Crystal Growth

1998 ◽  
Vol 102 (26) ◽  
pp. 5208-5216 ◽  
Author(s):  
Peter G. Vekilov ◽  
Bill R. Thomas ◽  
Franz Rosenberger
Keyword(s):  
Crystal Growth ◽  
Protein Crystal ◽  
Impurity Transport ◽  
Protein Crystal Growth
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