CO2 laser imaging interferometer for high spatial resolution electron density profile measurements on LHD

2003 ◽  
Vol 74 (3) ◽  
pp. 1638-1641 ◽  
Author(s):  
T. Akiyama ◽  
K. Tanaka ◽  
L. N. Vyacheslavov ◽  
A. Sanin ◽  
T. Tokuzawa ◽  
...  
Keyword(s):  
Electron Density ◽  
Spatial Resolution ◽  
Co2 Laser ◽  
Density Profile ◽  
High Spatial Resolution ◽  
Electron Density Profile ◽  
Laser Imaging ◽  
Imaging Interferometer ◽  
Resolution Electron

scholarly journals Improvements of CO2 Laser Heterodyne Imaging Interferometer for Electron Density Profile Measurements on LHD

2007 ◽  
Vol 2 ◽  
pp. S1033-S1033 ◽  
Author(s):  
Kenji TANAKA ◽  
Clive MICHAEL ◽  
Leonid VYACHESLAVOV ◽  
Andrei SANIN ◽  
Kazuo KAWAHATA ◽  
...  
Keyword(s):  
Electron Density ◽  
Co2 Laser ◽  
Density Profile ◽  
Electron Density Profile ◽  
Imaging Interferometer ◽  
Laser Heterodyne

Precise density profile measurements by using a two color YAG/CO2 laser imaging Interferometer on LHD

2004 ◽  
Vol 75 (10) ◽  
pp. 3429-3432 ◽  
Author(s):  
K. Tanaka ◽  
A. L. Sanin ◽  
L. N. Vyacheslavov ◽  
T. Akiyama ◽  
K. Kawahata ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Density Profile ◽  
Laser Imaging ◽  
Imaging Interferometer

CO2 laser polarimeter for electron density profile measurement on the Large Helical Device

2003 ◽  
Vol 74 (5) ◽  
pp. 2695-2703 ◽  
Author(s):  
T. Akiyama ◽  
S. Tsuji-Iio ◽  
R. Shimada ◽  
K. Nakayama ◽  
S. Okajima ◽  
...  
Keyword(s):  
Electron Density ◽  
Co2 Laser ◽  
Density Profile ◽  
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
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