Quasi-Monoenergetic Electron-Beam Generation Using a Laser Accelerator for Ultra-Short X-ray Sources

Kim, J.; Jang, Ha-Young; Yoo, Seung Hoon; Hur, Min Sup; Hwang, Ilmoon; Lim, Joonwon; Kulagin, V. V.; Suk, Hyyong; Choi, I. W.; Hafz, N.; Kim, H. T.; Hong, Kyung-Han; Yu, Tae-Jun; Sung, J. H.; Jeong, Tae Moon; Noh, Young‐Chul; Ko, Do‐Kyeong; Lee, J.

doi:10.3938/jkps.51.397

Cited by 10 publications

(3 citation statements)

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“…Sharp in this context means that the characteristic length of the transition is on the order of the plasma wavelength [17]. Up to now experimental realizations of this scheme did not produce monoenergetic electron beams and relied on a second laser beam that induces a plasma density transition via local plasma heating [18][19][20].…”

mentioning

confidence: 99%

Density-transition based electron injector for laser driven wakefield accelerators

Schmid

Buck

Sears

et al. 2010

Phys. Rev. ST Accel. Beams

266

200

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We demonstrate a laser wakefield accelerator with a novel electron injection scheme resulting in enhanced stability, reproducibility, and ease of use. In order to inject electrons into the accelerating phase of the plasma wave, a sharp downward density transition is employed. Prior to ionization by the laser pulse this transition is formed by a shock front induced by a knife edge inserted into a supersonic gas jet. With laser pulses of 8 fs duration and with only 65 mJ energy on target, the accelerator produces a monoenergetic electron beam with tunable energy between 15 and 25 MeV and on average 3.3 pC charge per electron bunch. The shock-front injector is a simple and powerful new tool to enhance the reproducibility of laser-driven electron accelerators, is easily adapted to different laser parameters, and should therefore allow scaling to the energy range of several hundred MeV.

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mentioning

confidence: 99%

Density-transition based electron injector for laser driven wakefield accelerators

Schmid

Buck

Sears

et al. 2010

Phys. Rev. ST Accel. Beams

266

200

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“…Many studies on the density transition scheme were conducted theoretically [31][32][33][34][35][36] and experimentally. [37][38][39][40] In the density transition scheme, the scale length (L s ), which is the distance between the high-and low-density regions, and the density transition ratio are very important parameters for the generation of a high-quality electron bunch. Recently, the scale length and transition ratio effect on the generation of high-quality electron bunches have been investigated through simulation studies.…”

Section: Introductionmentioning

confidence: 99%

Parameter Study on Radiation Therapy with Laser-Accelerated Electrons Using a Sharp Density Transition Scheme

Yoo¹,

Kim²,

Min³

et al. 2011

Jpn. J. Appl. Phys.

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A parameter study of radiation therapy with laser-accelerated electrons using a sharp density transition scheme was performed via computer simulations. Through particle-in-cell (PIC) simulations, a study of the optimum conditions for the generation of a monoenergetic electron beam was conducted. The beam quality can be controlled by adjusting the laser focal spot size. The charge of the electron bunch is related to the area of the phase mixing region. An electron bunch with the maximum charge was produced in the maximum area of the mixing region in a specific focal spot case. The energy spread of the electron bunch increases with increasing focal spot size owing to the nonlocalized acceleration phase of the wakefield in the larger focal spot case. The transverse bunch size decreases with increasing focal spot size from the narrower transverse size of the ion cavity in the larger focal spot. The dosimetric properties of these very-high-energy electron beams were calculated using Monte Carlo simulations.

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“…[10][11][12][13][14][15] In addition, experimental scheme for sharp density transition using parabolic plasma channel in the LWFA was proposed by Kim et al 16) and some LWFA experiments were performed. 17,18) However, to observe optimum conditions of the trapping and the acceleration in LWFA by sharp density transition, more detailed investigation including plasma profile with a finite scale length is needed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Scale Length and Transition Density Ratio on the Electron Trapping and Acceleration with a Sharp Density Transition in Laser Wakefield Accelerator

Yoo

Kim

et al. 2009

jjap

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In this paper, the effects of scale length and transition density ratio on the electron trapping and acceleration with a sharp density transition in laser wakefield accelerator (LWFA) have been studied using one-dimensional particle-in-cell (PIC) simulations. Simulation results show that the number of accelerated electrons depends on the plasma density in the high density region and the scale length of the density transition region. For the detailed investigation of the dynamical features of the electron trapping and acceleration, spatiotemporal patterns of the laser wake wave are also used. Throughout this work, the optimum condition for the electron acceleration could be found in the relevant parameter space of the scale length and the transition density ratio. #

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Quasi-Monoenergetic Electron-Beam Generation Using a Laser Accelerator for Ultra-Short X-ray Sources

Cited by 10 publications

References 1 publication

Density-transition based electron injector for laser driven wakefield accelerators

Density-transition based electron injector for laser driven wakefield accelerators

Parameter Study on Radiation Therapy with Laser-Accelerated Electrons Using a Sharp Density Transition Scheme

Effects of Scale Length and Transition Density Ratio on the Electron Trapping and Acceleration with a Sharp Density Transition in Laser Wakefield Accelerator

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