scholarly journals Particle-in-cell simulations of a current-free double layer

2011 ◽  
Vol 18 (6) ◽  
pp. 063502 ◽  
Author(s):  
S. D. Baalrud ◽  
T. Lafleur ◽  
R. W. Boswell ◽  
C. Charles
Keyword(s):  
Double Layer ◽  
Particle In Cell ◽  
A Current

One-dimensional particle-in-cell simulation of a current-free double layer in an expanding plasma

2005 ◽  
Vol 12 (5) ◽  
pp. 052317 ◽  
Author(s):  
Albert Meige ◽  
Rod W. Boswell ◽  
Christine Charles ◽  
Miles M. Turner
Keyword(s):  
Double Layer ◽  
One Dimensional ◽  
Particle In Cell ◽  
Cell Simulation ◽  
A Current

scholarly journals Brief Communication: The double layer in the separatrix region during magnetic reconnection

2015 ◽  
Vol 22 (2) ◽  
pp. 167-171
Author(s):  
J. Guo ◽  
B. Yu
Keyword(s):  
Electron Beam ◽  
Magnetic Reconnection ◽  
Double Layer ◽  
Particle In Cell ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Evolution Stage ◽  
Spatial Size ◽  
Electron Holes ◽  
Observation Results

Abstract. With two-dimensional (2-D) particle-in-cell (PIC) simulations we investigate the evolution of the double layer (DL) driven by magnetic reconnection. Our results show that an electron beam can be generated in the separatrix region as magnetic reconnection proceeds. This electron beam could trigger the ion-acoustic instability; as a result, a DL accompanied with electron holes (EHs) can be found during the nonlinear evolution stage of this instability. The spatial size of the DL is about 10 Debye lengths. This DL propagates along the magnetic field at a velocity of about the ion-acoustic speed, which is consistent with the observation results.

Observation of a current-limited double layer in a linear turbulent-heating device

1985 ◽  
Vol 28 (2) ◽  
pp. 703 ◽  
Author(s):  
Hiroshi Inuzuka ◽  
Yutaka Torii ◽  
Masaaki Nagatsu ◽  
Takashige Tsukishima
Keyword(s):  
Double Layer ◽  
Heating Device ◽  
Turbulent Heating ◽  
A Current

scholarly journals Effect of inside diameter of tip on proton beam produced by intense laser pulse on double-layer cone targets

2013 ◽  
Vol 31 (1) ◽  
pp. 123-127 ◽  
Author(s):  
Fengjuan Wu ◽  
Weimin Zhou ◽  
Lianqiang Shan ◽  
Zongqing Zhao ◽  
Jinqing Yu ◽  
...  
Keyword(s):  
Proton Beam ◽  
Double Layer ◽  
Intense Laser ◽  
Proton Beams ◽  
Particle In Cell ◽  
Inside Diameter ◽  
Peak Energy ◽  
Electro Magnetic ◽  
Cone Target ◽  
Beam Characteristics

AbstractThe laser-driven acceleration of proton beams from a double-layer cone target, comprised of a cone shaped high-Z material target with a low density proton layer, is investigated via two-dimensional fully relativistic electro-magnetic particle-in-cell simulations. The dependence of the inside diameter (ID) of the tip size of a double-layer cone target on proton beam characteristics is demonstrated. Our results show that the peak energy of proton beams significantly increases and the divergence angle decreases with decreasing ID size. This can be explained by the combined effects of a stronger laser field that is focused inside the cone target and a larger laser interaction area by reducing the ID size.

scholarly journals Improvement of proton beam quality by an optimized dragging field generated by the ultraintense laser interactions with a complex double-layer target

2016 ◽  
Vol 34 (3) ◽  
pp. 562-566 ◽  
Author(s):  
F. J. Wu ◽  
L. Q. Shan ◽  
W. M. Zhou ◽  
T. Duan ◽  
Y. L. Ji ◽  
...  
Keyword(s):  
Proton Beam ◽  
Double Layer ◽  
Beam Quality ◽  
Average Energy ◽  
Thin Foil ◽  
Pure Hydrogen ◽  
Carbon Ions ◽  
One Dimensional ◽  
Particle In Cell ◽  
Underdense Plasma

AbstractA scheme for the improvement of proton beam quality by the optimized dragging field from the interaction of ultraintense laser pulse with a complex double-layer target is proposed and demonstrated by one-dimensional particle-in-cell (Opic1D) simulations. The complex double-layer target consists of an overdense proton thin foil followed by a mixed hydrocarbon (CH) underdense plasma. Because of the existence of carbon ions, the dragging field in the mixed CH underdense plasma becomes stronger and flatter in the location of the proton beam than that in a pure hydrogen (H) underdense plasma. The optimized dragging field can keep trapping and accelerating protons in the mixed CH underdense target to high quality. Consequently, the energy spread of the proton beam in the mixed CH underdense plasma can be greatly reduced down to 2.6% and average energy of protons can reach to 9 GeV with circularly polarized lasers at intensities 2.74 × 1022 W/cm2.

Efficient generation of proton bunches by intense laser pulse with a double-slice-foil target

2012 ◽  
Vol 78 (4) ◽  
pp. 491-496
Author(s):  
JUN ZHENG ◽  
ZHENG-MING SHENG ◽  
JIN-LU LIU ◽  
WEI-MIN ZHOU ◽  
HAN XU ◽  
...  
Keyword(s):  
Double Layer ◽  
Laser Pulses ◽  
Intense Laser ◽  
Particle In Cell ◽  
Intense Laser Pulses ◽  
Proton Beam Energy ◽  
Direct Laser ◽  
Laser Acceleration ◽  
Foil Target ◽  
Target Design

AbstractA double-slice-foil target is proposed for the generation of quasi-monoenergetic proton bunches by intense laser pulses. In this new target structure, two symmetrical solid slices are adjoined obliquely to the front side of a plane double-layer target. Two-dimensional particle-in-cell simulations show that a large number of hot electrons are pulled out from solid slices and accelerated forward by direct laser acceleration, which lead to significant enhancement of the sheath field and the produced proton beam energy as compared with the normal plane double-layer target and some other modified targets. It appears that well-collimated proton bunches with energy larger than 200 MeV can be produced at the focused laser intensity of about 1021W/cm2 with the proposed target design.

scholarly journals Enhancement of monoenergetic proton beamsviacone substrate in high intensity laser pulse-double layer target interactions

2010 ◽  
Vol 28 (4) ◽  
pp. 585-590 ◽  
Author(s):  
Weimin Zhou ◽  
Yuqiu Gu ◽  
Wei Hong ◽  
Leifeng Cao ◽  
Zongqing Zhao ◽  
...  
Keyword(s):  
Double Layer ◽  
High Intensity ◽  
Laser Light ◽  
Surface Current ◽  
Hot Electrons ◽  
Two Dimensional ◽  
Particle In Cell ◽  
Laser Plasma Interactions ◽  
High Intensity Laser ◽  
Intensity Laser

AbstractA scheme capable of enhancing the energy of monoenergetic protons in high intensity laser-plasma interactions is proposed and demonstrated by two dimensional particle-in-cell simulations. The focusing of laser light pulse and the guiding of surface currentviathe highZmaterial cone-shaped substrate increase the temperature of hot electrons, which are responsible for the electrostatic field accelerating protons. Moreover, the sub-micron proton layer coated on the cone-shaped substrate makes the total proton beam experience the same accelerating field, thus the monochromaticity is maintained. Compared to the normal film double layer target, the energy of monoenergetic proton beams can be improved about three times.

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