D.G. Jang

Publications (2)5.02 Total impact

• Article: Density evolution measurement of hydrogen plasma in capillary discharge by spectroscopy and interferometry methods

  D. G. Jang, M. S. Kim, I. H. Nam, H. S. Uhm, H. Suk
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  ABSTRACT: Plasma density is one of the most important parameters for laser wakefield acceleration using a gas-filled capillary waveguide. We measured the evolving hydrogen plasma densities in capillary discharge by using two different diagnostics methods at the same time, i.e., the Stark-effect-based spectroscopy and the transverse interferometry methods. It was found that there is a rather large difference between two methods and the phenomenon is explained in view of self-absorption. The correlation was obtained and the result is quite useful for capillary-plasma-based laser wakefield acceleration research.
  Applied Physics Letters 10/2011; 99(14):141502-141502-3. · 3.84 Impact Factor
• Article: Discharge Characteristics of a Gas-Filled Capillary Plasma for Laser Wakefield Acceleration

  M.S. Kim, D.G. Jang, H.S. Uhm, S.W. Hwang, I.W. Lee, H. Suk
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  ABSTRACT: 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.
  IEEE Transactions on Plasma Science 09/2011; · 1.17 Impact Factor