Plasma density diagnostic for capillary-discharge based plasma channels

2015 ◽  
Vol 22 (7) ◽  
pp. 073112 ◽  
Author(s):  
J. Daniels ◽  
J. van Tilborg ◽  
A. J. Gonsalves ◽  
C. B. Schroeder ◽  
C. Benedetti ◽  
...  
Keyword(s):  
Plasma Density ◽  
Capillary Discharge ◽  
Plasma Channels

Intense laser pulse propagation in capillary discharge plasma channels

1999 ◽  
Author(s):  
R. F. Hubbard ◽  
Y. Ehrlich ◽  
D. Kaganovich ◽  
C. Cohen ◽  
C. I. Moore ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Propagation ◽  
Discharge Plasma ◽  
Capillary Discharge ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Plasma Channels

GUIDING OF HIGH LASER INTENSITIES IN LONG PLASMA CHANNELS

2007 ◽  
Vol 21 (03n04) ◽  
pp. 361-371
Author(s):  
M. LEVIN ◽  
S. EISENMANN ◽  
T. PALCHAN ◽  
A. ZIGLER ◽  
K. SUGIYAMA ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Laser Pulse ◽  
High Intensity ◽  
High Current Density ◽  
Laser System ◽  
Diagnostic Technique ◽  
Capillary Discharge ◽  
Intense Laser ◽  
Plasma Channels ◽  
Guided Propagation

Plasma channels have been widely used to guide intense laser pulses over many Rayleigh lengths. Using optimized segmented capillary discharges, we demonstrated guided propagation of ultra short (100 fs) high intensity (1016 W/cm-2, limited by the laser system) pulses over distances up to 12.6 cm and intensities above 1018W/cm2 for 1.5cm boron nitride capillary. Both radial and longitudinal density profiles of plasma channels were studied under various discharge conditions. A new diagnostic technique is presented in which the transport of a guided laser pulse at different delay times from the initiation of the discharge is sampled on a single discharge shot. Using external, 10 nsec Nd YAG laser of several tenths of milijoules to ignite polyethylene capillaries we have demonstrated channels of various length in density range of 1017 - 1019 cm -3 and up to 25% deep. The longitudinal profiles were found to be remarkably uniform in both short and long capillaries. The Boron Nitride capillary has provided a guiding medium that can withstand more than 1000 shots. Using these capillaries we have guided laser intensities above 1018W/cm2. The laser ignition of capillary discharge provided reliable almost jitter free approach. The concerns related to influence of relatively high current density flow through capillary on the injected electrons were studied extensively by us both theoretically and experimentally using a simple injection method. The method is based on the interaction of a high intensity laser pulse with a thin wire placed near capillary entrance. The influence of magnetic fields was found to be insignificant. Using this method we have studied transport of electrons though capillary discharge.

scholarly journals Beam-based characterization of plasma density in a capillary-discharge waveguide

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065217
Author(s):  
S. Romeo ◽  
M. Cesarini ◽  
A. Del Dotto ◽  
M. Ferrario ◽  
M. Galletti ◽  
...  
Keyword(s):  
Plasma Density ◽  
Capillary Discharge

laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation)

2019 ◽  
Author(s):  
Simon M. Hooker ◽  
Christopher Arran ◽  
Alexander von Boetticher ◽  
Laura Corner ◽  
George Hine ◽  
...  
Keyword(s):  
Plasma Density ◽  
Laser Guiding ◽  
Plasma Channels

Application of Capillary Discharge Technique for Deposition of Diamond-Like Carbon Thin Films (2nd Report)

2013 ◽  
Vol 133 (5) ◽  
pp. 293-299
Author(s):  
Kiyotoshi Fujii ◽  
Etsuo Fujiwara ◽  
Masayoshi Shimizu ◽  
Shozo Inoue
Keyword(s):  
Thin Films ◽  
Capillary Discharge ◽  
Diamond Like Carbon ◽  
Carbon Thin Films

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.

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