Enhancement of injection and acceleration of electrons in a laser wakefield accelerator by using an argon-doped hydrogen gas jet and optically preformed plasma waveguide

Ho, Yu‐Pin; Hung, T.-S.; Yen, C.-P.; Chen, Shouyuan; Chu, Hsu-Hsin; Lin, Jiunn‐Yuan; Wang, Jyhpyng; Chou, M.-C.

doi:10.1063/1.3596438

Cited by 15 publications

(6 citation statements)

References 45 publications

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“…The distributed pumping system is fault tolerant and allows synthesis of optimized pump beam profile. This laser system has been used for precision control of laser-plasma interaction, including electron injection and acceleration with a laserwakefield accelerator in an optically preformed plasma waveguide [68], optical-field-ionization collisional-excitation extreme-UV lasing in an optically preformed plasma waveguide [69], fabrication of structured plasma waveguide for periodic laser-plasma interaction [70], and control of electron injection and betatron oscillation in a laserwakefield accelerator [45]. These experiments have benefited from the quality and stability of this laser facility and demonstrated its capability for applications in high-field physics.…”

Section: Discussionmentioning

confidence: 99%

A 110-TW multiple-beam laser system with a 5-TW wavelength-tunable auxiliary beam for versatile control of laser-plasma interaction

et al. 2014

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A Ti:sapphire laser system has been constructed with two synchronized main beams of 110 TW and 13 TW, and a 5-TW wavelength-tunable synchronized auxiliary beam for versatile control of laser-plasma interaction. The first main beam provides 3.3-J, 30-fs, 810-nm pulses, and the second 450-mJ, 34-fs, 805-nm pulses. The auxiliary beam comes from amplified spectral windows selected from a supercontinuum of high spatial coherence and provides 38-fs pulses with tunable wavelengths (870-920 nm). The two main beams can be focused down to M 2 = 1.2 and 1.1, with 77 and 81 % energy enclosed in the focal spots, respectively. The energy fluctuations are 1.1 and 1.8 %, and the pointing fluctuations are 4.5 and 4.8 lrad, respectively. By using a preamplifier and saturable absorber before the pulse stretcher to suppress amplified spontaneous emission, the temporal contrast of the 110-TW main beam reaches 4 Â 10 À10 at the -100-ps timescale. Even though the auxiliary beam is generated from a highly nonlinear process, by confining the supercontinuum generation in a single self-trapping filament, a spatial coherence close to the main beams can be achieved. It can be focused down to M 2 = 1.3, with 72 % energy enclosed in the focal spot. The energy fluctuation is 2.6 %, and the pointing fluctuation is 4.7 lrad. The versatility of synchronized multiple-beams with tunable wavelengths, good energy and pointing stability, and the spatiotemporal quality of the laser system has been essential to our experiments in high-harmonic generation, extreme-UV lasers, and laser-wakefield accelerators in which precision control of laser-plasma interaction is facilitated by a concerted sequence of driving pulses.

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Section: Discussionmentioning

confidence: 99%

A 110-TW multiple-beam laser system with a 5-TW wavelength-tunable auxiliary beam for versatile control of laser-plasma interaction

et al. 2014

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“…Higher average current, better control and stability, and more robust system designs would all serve to improve the practicality of applications of accelerator-driven Xray sources. Laser-plasma accelerators have also been improved by recent innovations in experimental diagnostics [81] and plasma target designs [78,[82][83][84][85][86]. Both of these research areas continue to be of active interest.…”

Section: Laser Wakefield Electron Acceleratorsmentioning

confidence: 99%

All-laser-driven Thomson X-ray sources

Umstadter

2015

Contemporary Physics

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We discuss the development of a new generation of accelerator-based hard X-ray sources driven exclusively by laser light. High-intensity laser pulses serve the dual roles: first, accelerating electrons by laser-driven plasma wakefields, and second, generating X-rays by inverse Compton scattering. Such all-laser-driven X-rays have recently been demonstrated to be energetic, tunable, relatively narrow in bandwidth, short pulsed and well collimated. Such characteristics, especially from a compact source, are highly advantageous for numerous advanced X-ray applications-in metrology, biomedicine, materials, ultrafast phenomena, radiology and fundamental physics.

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“…In some previous LWFA experiments, argon mixed with other gas were used to realize the ionization injection 44 , it was also used alone as a target. 45,46 In the present experiment the argon gas jet stagnation pressure was in range 0.5 to 10 bars.…”

Section: Argon Gasmentioning

confidence: 99%

Enhanced electron yield from laser-driven wakefield acceleration in high-Z gas jets

Mirzaie

Hafz

et al. 2015

Review of Scientific Instruments

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An investigation of the electron beam yield (charge) form helium, nitrogen, and neon gas jet plasmas in a typical laser-plasma wakefield acceleration experiment is carried out. The charge measurement is made by imaging the electron beam intensity profile on a fluorescent screen into a charge coupled device which was cross-calibrated with an integrated current transformer. The dependence of electron beam charge on the laser and plasma conditions for the aforementioned gases are studied. We found that laser-driven wakefield acceleration in low Z-gas jet targets usually generates high-quality and well-collimated electron beams with modest yields at the level of 10-100 pC. On the other hand, filamentary electron beams which are observed from high-Z gases at higher densities reached much higher yields. Evidences for cluster formation were clearly observed in the nitrogen gas jet target, where we received the highest electron beam charge of ∼1.7 nC. Those intense electron beams will be beneficial for the applications on the generation of bright X-rays, gamma rays radiations, and energetic positrons via the bremsstrahlung or inverse-scattering processes.

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Enhancement of injection and acceleration of electrons in a laser wakefield accelerator by using an argon-doped hydrogen gas jet and optically preformed plasma waveguide

Cited by 15 publications

References 45 publications

A 110-TW multiple-beam laser system with a 5-TW wavelength-tunable auxiliary beam for versatile control of laser-plasma interaction

A 110-TW multiple-beam laser system with a 5-TW wavelength-tunable auxiliary beam for versatile control of laser-plasma interaction

All-laser-driven Thomson X-ray sources

Enhanced electron yield from laser-driven wakefield acceleration in high-Z gas jets

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