scholarly journals Helical modulation of the electrostatic plasma potential due to edge magnetic islands induced by resonant magnetic perturbation fields at TEXTOR

2015 ◽  
Vol 22 (10) ◽  
pp. 102516 ◽  
Author(s):  
G. Ciaccio ◽  
O. Schmitz ◽  
G. Spizzo ◽  
S. S. Abdullaev ◽  
T. E. Evans ◽  
...  
Keyword(s):  
Plasma Potential ◽  
Magnetic Islands ◽  
Magnetic Perturbation

scholarly journals Effect of large magnetic islands on screening of external magnetic perturbation fields at slow plasma flow

2017 ◽  
Vol 24 (2) ◽  
pp. 020705 ◽  
Author(s):  
L. Li ◽  
Y. Q. Liu ◽  
X. Huang ◽  
Q. Luan ◽  
F. C. Zhong
Keyword(s):  
Plasma Flow ◽  
Magnetic Islands ◽  
Magnetic Perturbation

Non-axisymmetric magneto- hydrodynamic equilibrium in the presence of internal magnetic islands and external magnetic perturbation coils

2013 ◽  
Vol 55 (12) ◽  
pp. 125009 ◽  
Author(s):  
B J Tobias ◽  
M E Austin ◽  
I G J Classen ◽  
C W Domier ◽  
N C Luhmann ◽  
...  
Keyword(s):  
Magnetic Islands ◽  
Magnetic Perturbation ◽  
Hydrodynamic Equilibrium

Magnetic Field and Geometry Effects on Finding Plasma Potential with a Cylindrical Impedance Probe

2012 ◽  
Author(s):  
David N. Walker ◽  
R. F. Fernsler ◽  
D. D. Blackwell ◽  
W. E. Amatucci
Keyword(s):  
Magnetic Field ◽  
Plasma Potential ◽  
Impedance Probe ◽  
Geometry Effects

Targeting Protective Catalase of Tumor Cells with Cold Atmospheric Plasma- Activated Medium (PAM)

2018 ◽  
Vol 18 (6) ◽  
pp. 784-804 ◽  
Author(s):  
Georg Bauer
Keyword(s):  
Control System ◽  
Singlet Oxygen ◽  
Tumor Cells ◽  
Plasma Potential ◽  
Atmospheric Plasma ◽  
Antitumor Action ◽  
Active Principle ◽  
Reaction Products ◽  
Cold Atmospheric Plasma

Background: Application of cold atmospheric plasma to medium generates “plasma-activated medium” that induces apoptosis selectively in tumor cells and that has an antitumor effect in vivo. The underlying mechanisms are not well understood. Objective: Elucidation of potential chemical interactions within plasma-activated medium and of reactions of medium components with specific target structures of tumor cells should allow to define the active principle in plasma activated medium. Methods: Established knowledge of intercellular apoptosis-inducing reactive oxygen/nitrogen species-dependent signaling and its control by membrane-associated catalase and SOD was reviewed. Model experiments using extracellular singlet oxygen were analyzed with respect to catalase inactivation and their relevance for the antitumor action of cold atmospheric plasma. Potential interactions of this tumor cell-specific control system with components of plasma-activated medium or its reaction products were discussed within the scope of the reviewed signaling principles. Results: None of the long-lived species found in plasma-activated medium, such as nitrite and H2O2, nor OCl- or .NO seemed to have the potential to interfere with catalase-dependent control of apoptosis-inducing signaling of tumor cells when acting alone. However, the combination of H2O2 and nitrite might generate peroxynitrite. The protonation of peroxnitrite to peroxynitrous acid allows for the generation of hydroxyl radicals that react with H2O2, leading to the formation of hydroperoxide radicals. These allow for singlet oxygen generation and inactivation of membrane-associated catalase through an autoamplificatory mechanism, followed by intercellular apoptosis-inducing signaling. Conclusion: Nitrite and H2O2 in plasma-activated medium establish singlet oxygen-dependent interference selectively with the control system of tumor cells.

scholarly journals Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minjun J. Choi ◽  
Lāszlo Bardōczi ◽  
Jae-Min Kwon ◽  
T. S. Hahm ◽  
Hyeon K. Park ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nonlinear Evolution ◽  
Plasma Turbulence ◽  
Magnetized Plasmas ◽  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Reconnection Site ◽  
Ambient Turbulence

AbstractMagnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the interaction between an MI and ambient turbulence can be important for the nonlinear MI evolution, but a lack of detailed experimental observations and analyses has prevented further understanding. Here, we provide comprehensive observations such as turbulence spreading into an MI and turbulence enhancement at the reconnection site, elucidating intricate effects of plasma turbulence on the nonlinear MI evolution.

scholarly journals Simulation of the loss of passing fast ions induced by magnetic islands in EAST tokamak plasmas

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025020
Author(s):  
Limin Yu ◽  
Erbing Xue ◽  
Debing Zhang ◽  
Shuyu Zheng ◽  
Xianmei Zhang ◽  
...  
Keyword(s):  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Fast Ions
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