Observations of visible argon line emissions and its spatial profile from Aditya-U tokamak plasma

2021 ◽  
Vol 92 (5) ◽  
pp. 053548
Author(s):  
K. Shah ◽  
J. Ghosh ◽  
G. Shukla ◽  
M. B. Chowdhuri ◽  
R. Manchanda ◽  
...  
Keyword(s):  
Tokamak Plasma ◽  
Spatial Profile ◽  
Argon Line

scholarly journals Spatial Profile of Neutral Temperature Measurement in Aditya-U Tokamak Plasmas

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 87
Author(s):  
Nandini Yadava ◽  
Joydeep Ghosh ◽  
Malay Bikas Chowdhuri ◽  
Ranjana Manchanda ◽  
Sripathi Punchithaya K ◽  
...  
Keyword(s):  
Zeeman Effect ◽  
Neutral Hydrogen ◽  
Tokamak Plasma ◽  
Tokamak Plasmas ◽  
Plasma Discharges ◽  
Spatial Profile ◽  
Temperature Estimation ◽  
Neutral Temperature ◽  
The Magnetic Field ◽  
Two Temperature

The spatial profile of neutral hydrogen temperatures in Aditya-U tokamak plasma has been estimated from the spatial profile of the Hα spectral emissions measured using a high-resolution multi-track spectrometer, having a spectral resolution of 0.023 nm at a 50 μm entrance slit width. The neutral temperature estimation from the Doppler broadened spectral line was carried out after considering the Zeeman effect due to the magnetic field present in the tokamak. To accurately obtain the temperature of the neutral hydrogen, two temperature components (warm and hot) were required to be considered. A code was developed to obtain the neutral temperature and is used to analyze two typical plasma discharges. The temperature of warm components varies between 3 and 5 eV, while hot atoms have temperatures in the range of 15–30 eV. It was observed that the chord-integrated neutral temperature increases slightly towards the plasma core region compared to the plasma edge of Aditya-U tokamak.

Resolution in the scanning tunneling microscope

1991 ◽  
Vol 49 ◽  
pp. 488-489
Author(s):  
R. J. Wilson ◽  
D. D. Chambliss ◽  
S. Chiang ◽  
V. M. Hallmark
Keyword(s):  
Scanning Tunneling Microscope ◽  
Fundamental Principle ◽  
Atomic Scale ◽  
Lateral Resolution ◽  
Scanning Tunneling ◽  
Electronic Noise ◽  
Vertical Resolution ◽  
Tunneling Microscopy ◽  
Spatial Profile ◽  
Theoretical Analyses

Scanning tunneling microscopy (STM) has been used for many atomic scale observations of metal and semiconductor surfaces. The fundamental principle of the microscope involves the tunneling of evanescent electrons through a 10Å gap between a sharp tip and a reasonably conductive sample at energies in the eV range. Lateral and vertical resolution are used to define the minimum detectable width and height of observed features. Theoretical analyses first discussed lateral resolution in idealized cases, and recent work includes more general considerations. In all cases it is concluded that lateral resolution in STM depends upon the spatial profile of electronic states of both the sample and tip at energies near the Fermi level. Vertical resolution is typically limited by mechanical and electronic noise.

Effects of nitrogen seeding in a tokamak plasma

2020 ◽  
Vol 27 (12) ◽  
pp. 122302
Author(s):  
Shrish Raj ◽  
N. Bisai ◽  
Vijay Shankar ◽  
A. Sen
Keyword(s):  
Tokamak Plasma

Transport barrier formation in a tokamak plasma

2001 ◽  
Vol 44 (3) ◽  
pp. 311-315
Author(s):  
Kseniya A Razumova
Keyword(s):  
Tokamak Plasma ◽  
Transport Barrier ◽  
Barrier Formation

Spatial Profile of Thermoelectric Effects During Peltier Pulsing in Bi and Bi/MnBi Eutectic

1986 ◽  
Vol 87 ◽  
Author(s):  
R. P. Silberstein ◽  
D. J. Larson
Keyword(s):  
Directional Solidification ◽  
Joule Heating ◽  
Current Density ◽  
Peltier Effect ◽  
Thomson Effect ◽  
Thermoelectric Effects ◽  
Spatial Profile ◽  
Thermal Transients ◽  
Solid Liquid Interface ◽  
Solid Liquid

AbstractWe have studied the spatial profile of the thermal transients that occur during and following the current pulsing associated with Peltier Interface Demarcation during directional solidification. Results for pure Bi are presented in detail and compared with corresponding results for the Bi/MnBi eutectic. Significant thermal transients occur throughout the sample that can be accounted for by the Peltier effect, the Thomson effect, and Joule heating. We have separated these effects and studied their behavior as a function of time, current density, and position with respect to the solid/liquid interface.

Convective Velocity Reversal Caused by Turbulence Transition in Tokamak Plasma

2013 ◽  
Vol 111 (26) ◽  
Author(s):  
W. L. Zhong ◽  
X. L. Zou ◽  
C. Bourdelle ◽  
S. D. Song ◽  
J. F. Artaud ◽  
...  
Keyword(s):  
Tokamak Plasma ◽  
Convective Velocity ◽  
Turbulence Transition ◽  
Velocity Reversal

XUV diagnostic line ratios for carbon-like Ca XV and a comparison with tokamak plasma observations

1992 ◽  
Vol 45 (4) ◽  
pp. 336-339 ◽  
Author(s):  
F P Keenan ◽  
K M Aggarwal ◽  
K A Berrington
Keyword(s):  
Tokamak Plasma
Sign in / Sign up

Export Citation Format

Share Document