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Discharge Characteristics of a Gas-Filled Capillary Plasma for Laser Wakefield Acceleration

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6 Author(s)
M. S. Kim ; Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology , Gwangju, Korea ; D. G. Jang ; H. S. Uhm ; S. W. Hwang
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A gas-filled capillary plasma source for potential use in conjunction with laser wakefield acceleration is developed, and its discharge characteristics are presented here. In the capillary, helium or hydrogen gas (~150 torr in pressure) is injected, and a pulsed high voltage (~25 kV) is applied for electrical discharge and plasma production. The discharge properties of the helium and hydrogen gases are compared. The plasma densities inside the capillary hole are measured with a Mach-Zehnder interferometer and are obtained separately by a simple analysis using the diffusion equation and measured current profiles.

Published in:

IEEE Transactions on Plasma Science  (Volume:39 ,  Issue: 8 )