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Particle-in-cell modeling of the nanosecond field emission driven discharge in pressurized hydrogen

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5021129· OSTI ID:1472064
 [1];  [2];  [3]
  1. The Univ. of Texas at Austin, Austin, TX (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Technion, Haifa (Israel)

The high-voltage field-emission driven nanosecond discharge in pressurized hydrogen is studied using the one-dimensional Particle-in-Cell Monte Carlo collision model. It is obtained that the main part of the field-emitted electrons becomes runaway in the thin cathode sheath. These runaway electrons propagate the entire cathode-anode gap, creating rather dense (~1012 cm–3) seeding plasma electrons. In addition, these electrons initiate a streamer propagating through this background plasma with a speed ~30% of the speed of light. Such a high streamer speed allows the self-acceleration mechanism of runaway electrons present between the streamer head and the anode to be realized. As a consequence, the energy of runaway electrons exceeds the cathode-anode gap voltage. In conclusion, the influence of the field emission switching-off time is analyzed. It is obtained that this time significantly influences the discharge dynamics.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1472064
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 123; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Demonstration of field emission driven microscale gas breakdown for pulsed voltages using in-situ optical imaging journal August 2018
Displacement current during the formation of positive streamers in atmospheric pressure air with a highly inhomogeneous electric field journal August 2018
Spatio-temporal dynamics of pulsed gas breakdown in microgaps journal January 2019
Mechanism of sub-nanosecond pulsed breakdown of pressurized nitrogen journal August 2019
Generation and registration of runaway electron beams during the breakdown of highly overvoltaged gaps filled with dense gases journal August 2018
E-beam generation in discharges initiated by voltage pulses with a rise time of 200 ns at an air pressure of 12.5–100 kPa journal March 2019

Figures / Tables (9)


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