Energy Analyser for Hot Ion Density Profile Measurements in GDT

2005 ◽  
Vol 47 (1T) ◽  
pp. 315-317 ◽  
Author(s):  
S. V. Murakhtin ◽  
V. V. Prikhodko
Keyword(s):  
Density Profile ◽  
Ion Density

scholarly journals Effect of self focusing on the prolongation of laser produced plasma channel

2009 ◽  
Vol 27 (1) ◽  
pp. 33-39 ◽  
Author(s):  
U. Verma ◽  
A.K. Sharma
Keyword(s):  
Theoretical Model ◽  
Time Delay ◽  
Laser Pulse ◽  
Density Profile ◽  
Plasma Channel ◽  
Ion Density ◽  
Pulse Technique ◽  
Recombination Time ◽  
Self Focusing ◽  
Gaseous Plasma

AbstractA theoretical model for the prolongation of lifetime of a gaseous plasma channel formed by two pulse technique at laser intensities below the tunnel ionization threshold is developed. The first laser pulse ionizes the gas completely on the axis and partially off the axis, causing self-defocusing of the pulse. After the passage of the pulse, the plasma expands radially, creating an atom/ion density profile with a minimum on the axis. Partial recombination also sets in. As the second pulse arrives, after a time delay of less than the recombination time (~ns), the electrons get heated, and the recombination rate is slowed down. The second pulse self focuses, enhancing the heating rate and lengthening the lifetime of the plasma channel.

Calibrating ion density profile measurements in ion thruster beam plasma

2016 ◽  
Vol 87 (11) ◽  
pp. 113502 ◽  
Author(s):  
Zun Zhang ◽  
Haibin Tang ◽  
Junxue Ren ◽  
Zhe Zhang ◽  
Joseph Wang
Keyword(s):  
Density Profile ◽  
Ion Density ◽  
Ion Thruster ◽  
Beam Plasma

scholarly journals Evaluation of focusing characteristics of spherical plasma focus diode

1998 ◽  
Vol 16 (1) ◽  
pp. 177-183
Author(s):  
Kazuo Imanari ◽  
Takeru Bingo ◽  
Kozue Sasaki ◽  
Weihua Jiang ◽  
Katsumi Masugata ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Density Profile ◽  
Plasma Focus ◽  
Ion Beam ◽  
Large Fraction ◽  
Initial Energy ◽  
Pinhole Camera ◽  
Ion Density ◽  
Rutherford Scattering ◽  
Spherical Plasma

Experiments and the associated simulations for the evaluation of the focusibility of spherical Plasma focus diode (SPFD) were carried out. To evaluate the ion beam focusibility, two types of time-integrated Rutherford scattering pinhole camera were used: angle-integrated and angle-resolved type. From the former method, the ion beam has been found to focus in a cylindrical area with 4.5mmφ × 6.0 mm. The ion density profile shows a peak at 2.5 mm downstream from the geometric focusing point. From the latter method, it is found that a large fraction of the ion beam is produced from the downstream region of the diode. In simulations, the influence of an initial ion thermal energy was evaluated on the ion beam focusibility. When the initial energy is 20 eV, the ion beam focused in a cylindrical area of 0.4 mmφ × 2.4 mm. The experimental focusing parameters seem to be much worse than those evaluated numerically presumably due to the aiming error of ion beam.

scholarly journals Measurement of Absolute Carbon Ion Density Profile Based on CXRS Diagnostic on HL-2A Tokamak

2020 ◽  
Vol 15 (0) ◽  
pp. 2402055-2402055
Author(s):  
Liang LIU ◽  
Deliang YU ◽  
Xiaoxue HE ◽  
Yanling WEI ◽  
Dong LI ◽  
...  
Keyword(s):  
Density Profile ◽  
Ion Density ◽  
Carbon Ion

Ion density profile across a shock in a partially ionized gas

AIAA Journal ◽  
1970 ◽  
Vol 8 (2) ◽  
pp. 372-373
Author(s):  
G. KAMIMOTO ◽  
M. NISHIDA
Keyword(s):  
Density Profile ◽  
Ionized Gas ◽  
Ion Density ◽  
Partially Ionized

scholarly journals Plasma density over Svalbard during the ISBJØRN campaign

2000 ◽  
Vol 18 (2) ◽  
pp. 209-214 ◽  
Author(s):  
C. M. Hall ◽  
A. P. van Eyken ◽  
K. R. Svenes
Keyword(s):  
Density Profile ◽  
Polar Ionosphere ◽  
Reliable Operation ◽  
Density Profiles ◽  
Ion Density ◽  
Instruments And Techniques ◽  
Similar Density ◽  
Positive Ion

Abstract. In 1997, reliable operation of the EISCAT Svalbard Radar (ESR) was achieved and a rocket launching facility at Ny Ålesund on Svalbard (79°N, 12°E) (SVALRAK) was established. On 20 November, 1977, the first instrumented payload was launched from SVALRAK. Although the payload configuration had been flown many times previously from Andøya Rocket Range on the Norwegian mainland, this presented an unprecedented in situ determination of positive ion density over Svalbard. Simultaneously, ESR measured similar density profiles but in a higher altitude regime. We have combined the ESR measurements with ionosonde data to establish a calibration and subsequently combined the ground-based and in situ determined profiles to give a composite positive ion density profile from the mesosphere to the thermosphere.Key words: Ionosphere (polar ionosphere; instruments and techniques)

First Vertical Ion Density Profile in Jupiter’s Auroral Atmosphere: Direct Observations Using the Keck II Telescope

2008 ◽  
Vol 677 (1) ◽  
pp. 790-797 ◽  
Author(s):  
M. B. Lystrup ◽  
S. Miller ◽  
N. Dello Russo ◽  
R. J. Vervack, Jr. ◽  
T. Stallard
Keyword(s):  
Density Profile ◽  
Ion Density ◽  
Direct Observations
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