Induction of electron injection and betatron oscillation in a plasma-waveguide-based laser wakefield accelerator by modification of waveguide structure

Ho, Yu‐Pin; Hung, T.-S.; Jhou, Jia-Ci; Qayyum, Hamza; Chen, W.-H.; Chu, Hsu-Hsin; Lin, Jiunn‐Yuan; Wang, Jyhpyng; Chen, S.-Y.

doi:10.1063/1.4817294

Cited by 6 publications

(6 citation statements)

References 40 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%

“…Precision control and manipulation of laser-plasma interaction can be achieved by using a concerted sequence of driving pulses with independently tuned pulse energies, durations, central wavelengths, and relative delays. For examples, in a laser-wakefield accelerator experiment with plasma waveguide and ramp injection, two longitudinal pulses of different durations are used to fabricate a transient plasma waveguide prior to the main driving pulse, and a transverse pulse is used to create a density down-ramp to induce electron injection [45]. Four pulses are needed in such experiments.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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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“…The density channel with a parabolic transverse density profile n(r) which is minimum on axis can also be used to guide the laser pulse. The methods to create such a channel include the igniter-heater method, [32,61] the discharge method for the gas-filled capillary [33] or ablative capillary, [62] etc. In the experiments carried out by Geddes in 2004, [32] a 1.7-mm channel was formed by two laser pulses (heater pulse, igniter 015205-4 pulse) that heat and expand the plasma on axis.…”

Section: Laser Guidingmentioning

confidence: 99%

Developments in laser wakefield accelerators: From single-stage to two-stage

Li¹,

Wang²,

Liu³

et al. 2015

Chinese Phys. B

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Laser wakefield accelerators (LWFAs) are compact accelerators which can produce femtosecond high-energy electron beams on a much smaller scale than the conventional radiofrequency accelerators. It is attributed to their high acceleration gradient which is about 3 orders of magnitude larger than the traditional ones. The past decade has witnessed the major breakthroughs and progress in developing the laser wakfield accelerators. To achieve the LWFAs suitable for applications, more and more attention has been paid to optimize the LWFAs for high-quality electron beams. A single-staged LWFA does not favor generating controllable electron beams beyond 1 GeV since electron injection and acceleration are coupled and cannot be independently controlled. Staged LWFAs provide a promising route to overcome this disadvantage by decoupling injection from acceleration and thus the electron-beam quality as well as the stability can be greatly improved. This paper provides an overview of the physical conceptions of the LWFA, as well as the major breakthroughs and progress in developing LWFAs from single-stage to two-stage LWFAs.

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“…Plasma loaded waveguide has a variety of applications, which include amplifiers [1] , oscillators [2,3] , charged particle accelerators [4,5] and high power sources of electromagnetic (EM) radiation [6−8] . These applications largely depended on the EM dispersion characteristics and interaction mechanisms of the relativistic electron beam (REB) interaction with plasma in a waveguide.…”

Section: Introductionmentioning

confidence: 99%

Effects of Boundary Current on Electromagnetic Dispersion Characteristics for a Relativistic Electron Beam

Jixiong¹,

Zeng²,

Xia³

et al. 2016

Plasma Sci. Technol.

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With betatron oscillation characteristics of the electron beam and ion channel effect taken into account, dispersion characteristics of electrostatic modes and TM modes for a relativistic electron beam guided by ion channel are studied. Dispersion relations are derived and solved numerically to investigate the dependence of the dispersion characteristics for electrostatic modes and TM modes on the betatron oscillation frequency and the ratio of the relativistic electron beam radius to the waveguide radius. The effects of the boundary current on the dispersion characteristic of the TM modes and the interaction between the betatron modes and TM modes are analyzed. When considering the boundary current, for a strong ion channel, a new low-frequency branch of the TM modes arises and the interaction frequency between the betatron modes and the TM01 modes is increased with the same parameters.

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Induction of electron injection and betatron oscillation in a plasma-waveguide-based laser wakefield accelerator by modification of waveguide structure

Cited by 6 publications

References 40 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

Developments in laser wakefield accelerators: From single-stage to two-stage

Effects of Boundary Current on Electromagnetic Dispersion Characteristics for a Relativistic Electron Beam

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