IPAC2016 - List of Authors (Lee, S.W.)

Paper	Title	Page
WEPMY014	Feasibility Study of a Laser-Driven High Energy Electron Acceleration in a Long Up-Ramp Density	2576
	M. Kim, J. Kim, S.W. Lee, I.H. Nam, H. Suk GIST, Gwangju, Republic of Korea
	Laser-driven wakefield acceleration (LWFA) has received much attention as it can produce GeV-level high-energy electrons in cm-scale distance. However, the accelerated electron energies are still limited by several factors, especially by the dephasing problem that is caused by different velocities between the plasma wake wave and the accelerated electron beam. In order to increase the acceleration length restricted by the dephasing problem, we developed a gas-cell with density-tapering, which is realized by applying different gas pressures into two gas inlets in the gas cell. In this way, the gas density and gradient can be easily controlled in the gas cell. We used the density-tapered gas-cell for laser wakefield acceleration experiments in our laboratory with a 20 TW/40 fs Ti:sapphire laser system*. The results show that the electron energy can be significantly enhanced (about twice) with the tapered density gas-cell, compared with a uniform density conventional gas-cell. In this presentation, we show the experimental results and comparison with two-dimensional (2-D) particle-in-cell (PIC) simulation results. W. P. Leemans et al. Phy. Rev. Lett. 113, 245002 (2014). M. S. Kim et al. Appl. Phy. Lett. 102, 204103 (2013). * I. H. Nam et al. Curr. Appl. Phy. 15, 468 (2015).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY014
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Paper

Title

Page

Feasibility Study of a Laser-Driven High Energy Electron Acceleration in a Long Up-Ramp Density

2576

M. Kim, J. Kim, S.W. Lee, I.H. Nam, H. Suk
GIST, Gwangju, Republic of Korea

Laser-driven wakefield acceleration (LWFA) has received much attention as it can produce GeV-level high-energy electrons in cm-scale distance*. However, the accelerated electron energies are still limited by several factors, especially by the dephasing problem that is caused by different velocities between the plasma wake wave and the accelerated electron beam. In order to increase the acceleration length restricted by the dephasing problem**, we developed a gas-cell with density-tapering, which is realized by applying different gas pressures into two gas inlets in the gas cell. In this way, the gas density and gradient can be easily controlled in the gas cell. We used the density-tapered gas-cell for laser wakefield acceleration experiments in our laboratory with a 20 TW/40 fs Ti:sapphire laser system***. The results show that the electron energy can be significantly enhanced (about twice) with the tapered density gas-cell, compared with a uniform density conventional gas-cell. In this presentation, we show the experimental results and comparison with two-dimensional (2-D) particle-in-cell (PIC) simulation results.
* W. P. Leemans et al. Phy. Rev. Lett. 113, 245002 (2014).
** M. S. Kim et al. Appl. Phy. Lett. 102, 204103 (2013).
*** I. H. Nam et al. Curr. Appl. Phy. 15, 468 (2015).

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY014

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)