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Simulations of a hydrogen-filled capillary discharge waveguide
N A Bobrova1, A A Esaulov, J-I Sakai
1Institute for Theoretical and Experimental Physics, Bol'shaya Cheremushkinskaya Street 25, 117259 Moscow, Russia.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 22, 2002
Summary
This study models gas-filled capillary discharge waveguides for high-intensity laser pulses. Simulations match experimental data, revealing distinct discharge stages driven by plasma pressure, not magnetic pressure.
Area of Science:
- Plasma physics
- High-intensity laser-matter interactions
- Magnetohydrodynamics
Background:
- Gas-filled capillary discharge waveguides are crucial for guiding high-intensity laser pulses.
- Understanding discharge dynamics is essential for optimizing laser propagation.
- Previous experimental work provides data for validating simulation models.
Purpose of the Study:
- To investigate the discharge dynamics of a gas-filled capillary discharge waveguide using a 1D dissipative magnetohydrodynamics code.
- To compare simulation results with experimental measurements of electron density profiles.
- To identify and characterize the different stages of the capillary discharge evolution.
Main Methods:
- Utilized a one-dimensional dissipative magnetohydrodynamics (MHD) code.
- Performed simulations under conditions matching a specific experimental study (Spence et al., 2001).
- Developed a simple analytical model for the final discharge stage.
Main Results:
- Simulations showed good agreement with experimental electron density profiles.
- The discharge evolution differs significantly from Z-pinch capillary discharges due to higher plasma pressure.
- Three distinct discharge stages were identified, with the final stage governed by ohmic heating and electron heat conduction.
Conclusions:
- The 1D MHD code accurately models gas-filled capillary discharge waveguides.
- Plasma pressure dominance dictates unique discharge dynamics compared to Z-pinch devices.
- The final discharge stage can be effectively modeled by balancing heating and cooling mechanisms.