Measurements of electron density profile by frequency modulated continuous wave reflectometer in the T-10 tokamak using high magnetic field side probing and extraordinary mode lower cutoff

2018 ◽  
Vol 89 (9) ◽  
pp. 094708 ◽  
Author(s):  
D. A. Shelukhin ◽  
V. A. Vershkov ◽  
G. F. Subbotin ◽  
D. V. Sarychev ◽  
A. A. Petrov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Density ◽  
High Magnetic Field ◽  
Density Profile ◽  
Continuous Wave ◽  
Electron Density Profile ◽  
Lower Cutoff

Triple splitting and z-rays in polar ionograms

2015 ◽  
Vol 27 (4) ◽  
pp. 383-387 ◽  
Author(s):  
Carlo Scotto
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Group Refractive Index ◽  
Ray Trace

AbstractThe theory of propagation in a direction almost parallel to the Earth’s magnetic field is reviewed, calculating the group refractive index of the ordinary ray in the presence of electron-neutral collisions. An electron density profile is estimated from the ordinary trace and is used to compute the z-ray trace. It is shown that this reconstruction can help to identify the rare cases of z-rays from among the numerous cases of duplicate ordinary traces, due to reflection from two different directions.

Development of frequency modulated continuous wave reflectometer for electron density profile measurement on the HL-2A tokamak

2014 ◽  
Vol 85 (1) ◽  
pp. 013507 ◽  
Author(s):  
W. L. Zhong ◽  
Z. B. Shi ◽  
X. L. Huang ◽  
Z. T. Liu ◽  
W. Chen ◽  
...  
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Continuous Wave ◽  
Electron Density Profile ◽  
Profile Measurement

Estimation of the electron density profile in the D region from rocket measurement of VLF signals from a ground based transmitter

1981 ◽  
Vol 64 (11) ◽  
pp. 68-74
Author(s):  
Isamu Nagano ◽  
Masayoshi Mambo ◽  
Tetsuo Fukami ◽  
Koji Namba ◽  
Iwane Kimura
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile ◽  
Rocket Measurement ◽  
D Region

scholarly journals Radial density profile and stability of capillary discharge plasma waveguides of lengths up to 40 cm

2021 ◽  
Vol 9 ◽  
Author(s):  
M. Turner ◽  
A. J. Gonsalves ◽  
S. S. Bulanov ◽  
C. Benedetti ◽  
N. A. Bobrova ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electron Density ◽  
Density Profile ◽  
Pulse Propagation ◽  
Spot Size ◽  
Capillary Discharge ◽  
Electron Density Profile ◽  
Plasma Waveguide ◽  
Wakefield Acceleration ◽  
Plasma Wakefield

Abstract We measured the parameter reproducibility and radial electron density profile of capillary discharge waveguides with diameters of 650 $\mathrm{\mu} \mathrm{m}$ to 2 mm and lengths of 9 to 40 cm. To the best of the authors’ knowledge, 40 cm is the longest discharge capillary plasma waveguide to date. This length is important for $\ge$ 10 GeV electron energy gain in a single laser-driven plasma wakefield acceleration stage. Evaluation of waveguide parameter variations showed that their focusing strength was stable and reproducible to $<0.2$ % and their average on-axis plasma electron density to $<1$ %. These variations explain only a small fraction of laser-driven plasma wakefield acceleration electron bunch variations observed in experiments to date. Measurements of laser pulse centroid oscillations revealed that the radial channel profile rises faster than parabolic and is in excellent agreement with magnetohydrodynamic simulation results. We show that the effects of non-parabolic contributions on Gaussian pulse propagation were negligible when the pulse was approximately matched to the channel. However, they affected pulse propagation for a non-matched configuration in which the waveguide was used as a plasma telescope to change the focused laser pulse spot size.

Impurity effects on trapped electron modes in tokamak plasmas with inverted electron density profile

2021 ◽  
Vol 28 (5) ◽  
pp. 052510
Author(s):  
X. R. Zhang ◽  
J. Q. Dong ◽  
H. R. Du ◽  
J. Y. Liu ◽  
Y. Shen ◽  
...  
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile ◽  
Tokamak Plasmas ◽  
Impurity Effects ◽  
Trapped Electron

Ultrashort pulse reflectometry for electron density profile measurements

1999 ◽  
Vol 70 (1) ◽  
pp. 1038-1041 ◽  
Author(s):  
C. W. Domier ◽  
Y. Roh ◽  
N. C. Luhmann
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Ultrashort Pulse ◽  
Electron Density Profile

Improved reflectometer electron density profile measurements on DIII-D

2003 ◽  
Vol 74 (3) ◽  
pp. 1525-1529 ◽  
Author(s):  
G. Wang ◽  
L. Zeng ◽  
E. J. Doyle ◽  
T. L. Rhodes ◽  
W. A. Peebles
Keyword(s):  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile
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