Generation of quasi-monoenergetic electron beams with small normalized divergences angle from a 2 TW laser facility

Li, D Z; Yan, Wenchao; Chen, L M; Huang, Kai; Ma, Y.; Jing, Zhao; Zhang, L; Hafz, N.; Wang, Weimin; L, J; Li, Y T; Wei, Zhiyi; Gao, Jie; Sheng, Zheng-Ming; Zhang, J

doi:10.1364/oe.22.012836

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…One regime was obtained for the laser pulse duration of ∼200 fs, and plasma density in the range of 3.6-4×10 19 -1.1×10 20 cm −3 , as described above. Another regime of electron acceleration was observed at the comparatively lower laser pulse duration of ∼55 fs, where the generation of QM electron beams of peak energy ∼30 MeV with almost 100% reproducibility (similar to our earlier observation [23] and various other reports [16][17][18][19][20][21][22][23]) was observed, and this could be attributed to the SM-LWFA mechanism. Figure 6 shows a typical QM electron beam spectrum recorded at the laser pulse duration of ∼55 fs during the same experimental run.…”

Section: Discussionsupporting

confidence: 90%

“…A laser pulse of short duration, such that L=cτλ p is used, where L is laser pulse length, c is speed of light, τ is FWHM (full width at half maximum) pulse duration, and λ p is plasma wavelength. However, the generation of QM electron beams of a few tens of MeV energies have also been demonstrated by the self-modulated laser wakefield acceleration (SM-LWFA) [16][17][18][19][20][21][22][23] regime at comparatively higher plasma densities (L?λ p ) , by using laser pulses as long as 90 fs, and it was suggested that small laser pulselets that formed due to the self-modulation of the laser pulse could create bubble regime conditions [16]. Earlier reported experiments with comparatively longer laser pulses (a few hundreds of fs to ps) also generated relativistic electron beams through SM-LWFA but with a broad continuous spectrum [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Betatron resonance electron acceleration and generation of relativistic electron beams using 200 fs Ti:sapphire laser pulses

Hazra

Moorti

Rao

et al. 2018

Plasma Phys. Control. Fusion

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Generation of collimated, quasi-monoenergetic electron beams (peak energy ~17-22MeV, divergence ~10mrad, energy spread ~20%) by interaction of Ti:sapphire laser pulse of 200fs duration, focussed to an intensity of ~ 2.1×10 18 W/cm 2 ,with an under-dense (density~3.6×10 19 to ~1.1×10 20 cm -3 ) He gas-jet plasma was observed. Two stages of selffocusing of the laser pulse in the plasma were observed. Two groups of accelerated electrons were also observed associated with these stages of the channeling and is attributed to the betatron resonance acceleration mechanism. This is supported by 2D PIC simulations performed using code EPOCH and a detailed theoretical analysis which shows that present experimental conditions are more favorable for betatron resonance acceleration and generation of collimated, quasi-thermal/quasi-monoenergetic electron beams.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Betatron resonance electron acceleration and generation of relativistic electron beams using 200 fs Ti:sapphire laser pulses

Hazra

Moorti

Rao

et al. 2018

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

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“…For 118 (30) TW pulses, the focused peak intensity and the corresponding normalized vector potential a 0 were 8.7 × 10 18 (2.6 × 10 18 ) W/cm 2 and 2.1 (1.1), respectively. The density of the laser-produced plasma from both nozzles (4 mm and 1 cm) was probed by interferometery and forward Raman scattering (FRS) diagnostics in previous experiments and comparted with hydrodynamic calculations of the gas density 38 39 40 . The nozzle was positioned below the laser spot at a vertical height of 2 mm and the gas valve was triggered 4.5 ms (which is the time it takes for the gas density to reach maximum at nozzle exit) before arrival of the laser pulse.…”

Section: Methodsmentioning

confidence: 99%

Demonstration of self-truncated ionization injection for GeV electron beams

Mirzaie

Zeng

et al. 2015

Sci Rep

Self Cite

118

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Ionization-induced injection mechanism was introduced in 2010 to reduce the laser intensity threshold for controllable electron trapping in laser wakefield accelerators (LWFA). However, usually it generates electron beams with continuous energy spectra. Subsequently, a dual-stage target separating the injection and acceleration processes was regarded as essential to achieve narrow energy-spread electron beams by ionization injection. Recently, we numerically proposed a self-truncation scenario of the ionization injection process based upon overshooting of the laser-focusing in plasma which can reduce the electron injection length down to a few hundred micrometers, leading to accelerated beams with extremely low energy-spread in a single-stage. Here, using 100 TW-class laser pulses we report experimental observations of this injection scenario in centimeter-long plasma leading to the generation of narrow energy-spread GeV electron beams, demonstrating its robustness and scalability. Compared with the self-injection and dual-stage schemes, the self-truncated ionization injection generates higher-quality electron beams at lower intensities and densities, and is therefore promising for practical applications.

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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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Generation of quasi-monoenergetic electron beams with small normalized divergences angle from a 2 TW laser facility

Cited by 7 publications

References 27 publications

Betatron resonance electron acceleration and generation of relativistic electron beams using 200 fs Ti:sapphire laser pulses

Betatron resonance electron acceleration and generation of relativistic electron beams using 200 fs Ti:sapphire laser pulses

Demonstration of self-truncated ionization injection for GeV electron beams

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

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