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 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.

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 Calculation on 2 cm ECRIT Thrust Regulation Based on 3D PIC Numerical Simulation Method

2020 ◽  
Vol 38 (4) ◽  
pp. 733-739
Author(s):  
Zhan Hu ◽  
Juan Yang ◽  
Maolin Chen ◽  
Daren Yu ◽  
Ximing Zhu
Keyword(s):  
Electron Cyclotron Resonance ◽  
Simulation Method ◽  
Grid Structure ◽  
Ion Density ◽  
Ion Thruster ◽  
Voltage Range ◽  
Wide Range ◽  
Focusing Property ◽  
Pic Method ◽  
Thrust Performance

Drag-free control is the key technology for space gravitational wave detection, which will be completed by miniature thruster. 2 cm Electron Cyclotron Resonance Ion Thruster (ECRIT) may be used for the drag-free control. Therefore, the 3D PIC method is used to estimate the thrust regulation of 2 cm ECRIT through simulating the property of ion extracting from the double-grid system. Through analyzing the thrust performance and grid focusing property under different grid apertures, the better grid structure is selected for the subsequent calculation. On this basis, the influence of grid voltage and the ion density on the performance of the thruster is analyzed. The result shows that reducing grid aperture can reduce the thrust, but it also affects the focusing property of the grid. Changing the ion density can adjust the thrust in a wide range. At given grid structure and ion density, there is a suitable grid accelerating voltage range to ensure the best ion focus characteristics. Considering the thrust performance and focusing characteristics, the grid structure with screen and accelerating grid aperture in 0.6 mm and 0.34 mm is selected. When the ion density is 1×1 017, 0.7×1 017, 0.4×1 017 and 0.2×1 017 m-3, the thrust can range from 5.05 to 141.44 μN through adjusting the grid accelerating voltage. This study can provide information for analyzing the possibility of the thruster application.

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

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
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