Comment on ‘‘Current‐density profiles for a Ga+ion microprobe and their lithographic implications’’ [Appl. Phys. Lett.51, 1960 (1987)]

1988 ◽  
Vol 52 (24) ◽  
pp. 2089-2089 ◽  
Author(s):  
R. L. Kubena ◽  
J. W. Ward
Keyword(s):  
Current Density ◽  
Ion Microprobe ◽  
Density Profiles

Current Density Profiles of Surface Mounted and Recessed Electrodes for Neural Prostheses

1987 ◽  
Vol BME-34 (11) ◽  
pp. 864-875 ◽  
Author(s):  
Jay T. Rubinstein ◽  
Francis A. Spelman ◽  
Mani Soma ◽  
Michael F. Suesserman
Keyword(s):  
Current Density ◽  
Neural Prostheses ◽  
Density Profiles

Electrostatic and Electrodynamic Field Analyses of 33kV Line Insulators

2006 ◽  
Vol 7 (3) ◽  
Author(s):  
Ibrahim A. Metwally ◽  
Md Abdus Salam ◽  
Ali Al-Maqrashi ◽  
Saif AR Sumry ◽  
Saif SH Al-Harthy
Keyword(s):  
Electric Field ◽  
Current Density ◽  
High Current Density ◽  
Experimental Tests ◽  
Finite Element Models ◽  
High Current ◽  
Density Profiles ◽  
Fully Integrated ◽  
Software Modules ◽  
Simulation Results

Electrostatic and electrodynamic field analyses of 33kV line insulators were introduced to compare the electric-field and the current density profiles of commonly used line insulators in Oman; namely, silicone rubber (SiR) and porcelain line post insulators, and porcelain cap and pin insulator string. SLIM software package was used for such simulation, which is a fully integrated collection of software modules that provides facilities for the generation and solution of electromagnetic finite element models. The simulation results reveal that for the electrostatic simulation under pollution conditions, SiR and porcelain line-post insulators give maximum values of the electric field of 360kV/m and 1700kV/m, respectively. The latter value exceeds the recommended electric field level of 500kV/m. For the electrodynamic simulation under pollution conditions, the electric field and the current density are much higher for porcelain insulator compared to those of SiR insulator. The simulation of four cap-pin standard insulator string reveals that there is high electric field (1250kV/m) at the cap-insulator gap which can cause high current density for polluted case. Finally, the trend of the simulation results has been verified by experimental tests, which has been conducted on different 33kV line insulators having different designs and materials.

Study of 2D Residual Current Density Profiles of BSCCO and YBCO HTS Tapes by Means of 3D Hall Probe System

2016 ◽  
Vol 26 (3) ◽  
pp. 1-5 ◽  
Author(s):  
Mohamed Tallouli ◽  
Jian Sun ◽  
Oleg Shyshkin ◽  
Makoto Hamabe ◽  
Hirofumi Watanabe ◽  
...  
Keyword(s):  
Current Density ◽  
Residual Current ◽  
Hall Probe ◽  
Density Profiles ◽  
Probe System

Reconstruction of critical current density profiles from AC loss measurements

1998 ◽  
Vol 310 (1-4) ◽  
pp. 173-176 ◽  
Author(s):  
A.A. Kordyuk ◽  
V.V. Nemoshkalenko ◽  
R.V. Viznichenko ◽  
W. Gawalek
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ac Loss ◽  
Density Profiles

scholarly journals Plasma Stability in a Tokamak with Reactor Technologies Taking into Account the Pressure Pedestal

2021 ◽  
Vol 47 (11) ◽  
pp. 1119-1127
Author(s):  
S. Yu. Medvedev ◽  
A. A. Martynov ◽  
S. V. Konovalov ◽  
V. M. Leonov ◽  
V. E. Lukash ◽  
...  
Keyword(s):  
Current Density ◽  
Stability Limit ◽  
High Plasma ◽  
Quasi Equilibrium ◽  
Plasma Stability ◽  
Density Profiles ◽  
Edge Localized Modes ◽  
Operating Limits ◽  
Plasma Torus ◽  
The Stability

Abstract Studying stationary regimes with high plasma confinement in a tokamak with reactor technologies (TRT) [1] involves calculating the plasma stability taking into account the influence of the current density profiles and pressure gradient in the pedestal near the boundary. At the same time, the operating limits should be determined by the parameters of the pedestal, which, in particular, are set by the stability limit of the peeling–ballooning modes that trigger the peripheral disruption of edge localized modes (ELM). Using simulation of the quasi-equilibrium evolution of the plasma by the ASTRA and DINA codes, as well as a simulator of magnetohydrodynamic (MHD) modes localized at the boundary of the plasma torus based on the KINX code, stability calculations are performed for different plasma scenarios in the TRT with varying plasma density and temperature profiles, as well as the corresponding bootstrap current density in the pedestal region. At the same time, experimental scalings for the width of the pedestal are used. The obtained pressure values are below the limits for an ITER-like plasma due to the lower triangularity and higher aspect ratio of TRT plasma. For the same reason, the reversal of magnetic field shear in the pedestal occurs at a lower current density, which causes the instability of modes with low toroidal wave numbers and reduces the effect of diamagnetic stabilization.

scholarly journals MHD Instabilities in Tokamak Plasmas with Hollow Current Density Profiles

2013 ◽  
Vol 8 (0) ◽  
pp. 1403156-1403156
Author(s):  
Goshi YAMADA ◽  
Yuji NAKAMURA ◽  
Katsumi KONDO
Keyword(s):  
Current Density ◽  
Tokamak Plasmas ◽  
Density Profiles ◽  
Mhd Instabilities
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