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

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6 Author(s)
Kim, M.S. ; Grad. Program of Photonics & Appl. Phys., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea ; Jang, D.G. ; Uhm, H.S. ; Hwang, S.W.
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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.

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