Electron radiography with different beam parameters using laser plasma accelerator

Hazra, Dibyendu; Mishra, S. R.; Moorti, A.; Chakera, J. A.

doi:10.1103/physrevaccelbeams.22.074701

Cited by 11 publications

(12 citation statements)

References 47 publications

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“…8 c & d). This suggests increasing role of wakefield towards higher density leading to a hybrid acceleration regime [66,71]. The above observations are also supported by the fact that the present experimental condition of L~λ p and P ~P c may not support strong self-modulation of the laser pulse and hence generation of strong wakefield.…”

Section: (B) 2d Pic Simulation Verification Of Acceleration Mechanismssupporting

confidence: 57%

“…Further, through detailed PIC simulations it was shown that DLA can double the energy of accelerating electrons over wakefield [67][68][69][70]. In our recent investigations also, we identified pure DLA and hybrid regime of acceleration in pure N 2 and He + N 2 mixed gas target for similar condition of L>λ p [71]. Role of DLA in laser plasma acceleration is a subject of current investigation.…”

Section: Introductionmentioning

confidence: 81%

“…~1.6 -4.3×10 18 cm -3 . In such a scenario there could be significant overlap of the laser pulse with accelerated electrons and therefore contribution of DLA mechanism of acceleration has also to be considered [30][31][32][66][67][68][69][70][71].…”

Section: Discussion: (A) Identification Of Acceleration Mechanismsmentioning

confidence: 99%

“…9 (i-iii) respectively. In all the three cases betatron oscillation of electrons is clearly seen in the laser created channel, suggesting acceleration by pure DLA mechanism [67,[69][70][71]. FIG.9.…”

Section: (B) 2d Pic Simulation Verification Of Acceleration Mechanismsmentioning

confidence: 96%

See 3 more Smart Citations

Direct laser acceleration of electrons in a high-Z gas target and the effect of threshold plasma density on electron beam generation

Hazra

Moorti

Mishra

et al. 2019

Plasma Phys. Control. Fusion

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An experimental study of laser driven electron acceleration in N 2 and N 2 -He mixed gas-jet target using laser pulses of duration ~60-70 fs is presented. Generation of relativistic electron beam with quasi-thermal spectra was observed at a threshold density of ~1.6×10 18 cm -3 in case of pure N 2 , and the threshold density was found to increase with increasing doping concentration of He.At an optimum fraction of 50% of He in N 2, generation of quasi-monoenergetic electron beams was observed at a comparatively higher threshold density of ~2×10 18 cm -3 , with an average peak energy of ~168 MeV, average energy spread of ~21%, and average total beam charge of ~220 pC. Electron acceleration could be attributed to the direct laser acceleration as well as the hybrid mechanism. Observation of an optimum fraction of He in N 2 (in turn threshold plasma density) for comparatively better quality electron beam generation could be understood in terms of the plasma density dependent variation in the dephasing rate of electrons with respect to transverse oscillating laser field. Results are also supported by the 2D PIC simulations performed using code EPOCH.

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Section: (B) 2d Pic Simulation Verification Of Acceleration Mechanismssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 81%

Section: Discussion: (A) Identification Of Acceleration Mechanismsmentioning

confidence: 99%

Section: (B) 2d Pic Simulation Verification Of Acceleration Mechanismsmentioning

confidence: 96%

See 2 more Smart Citations

Direct laser acceleration of electrons in a high-Z gas target and the effect of threshold plasma density on electron beam generation

Hazra

Moorti

Mishra

et al. 2019

Plasma Phys. Control. Fusion

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“…[ 18 ] High energy electron radiography through laser plasma acceleration with wakefield method or direct laser acceleration method at 100 MeV is attained, which has 100 μm range resolution. [ 19–21 ] But for the high energy electron radiography from laser‐driven plasma accelerators, the pointing and spectra stability of electron bunch in the previous experiment could not maintain within several shots. The stable electron beams on spectra and direction have been achieved in our experiments and used to direct imaging.…”

Section: Introductionmentioning

confidence: 99%

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Cai

et al. 2020

Physica Status Solidi (a)

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Direct imaging is a key tool for diagnostics of density transition in different material composition. Ultrafast electron bunches from 100 TW‐level laser system are attractive in future applications. Experiments for direct imaging with 100 MeV electrons are conducted using a 200 TW laser facility in Peking University. Electron bunches with energy spectra ranging from 100 to 150 MeV are achieved with a mixture gas of 0.5% nitrogen and 99.5% helium. Herein, the contrast imaging, transmission, and slit experiments are conducted and analyzed. It turns out the superiority of the hundreds of MeV electrons in thick material imaging applications. It is also anticipated that this technology can be used for ultrafast dynamic analysis with the advent of higher charge electrons in a single ultrafast bunch from laser‐driven electron accelerators.

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Basic Concepts of Radiation Biology

Baeyens,

Abrantes,

Ahire

et al. 2023

Radiobiology Textbook

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Radiation biology is the study of the effects of ionizing radiation on biological tissues and living organisms. It combines radiation physics and biology. The purpose of this chapter is to introduce the terminology and basic concepts of radiobiology to create a better understanding of the ionizing radiation interactions with a living organism. This chapter firstly describes the different types of radiation, the sources, and the radiation interactions with matter. The basic concepts of radioactivity and its applications are also included. Ionizing radiation causes significant physical and chemical modifications, which eventually lead to biological effects in the exposed tissue or organism. The physical quantities and units needed to describe the radiation are introduced here. Eventually, a broad range of biological effects of the different radiation types are addressed. This chapter concludes with a specific focus on the effects of low doses of radiation.

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Electron radiography with different beam parameters using laser plasma accelerator

Cited by 11 publications

References 47 publications

Direct laser acceleration of electrons in a high-Z gas target and the effect of threshold plasma density on electron beam generation

Direct laser acceleration of electrons in a high-Z gas target and the effect of threshold plasma density on electron beam generation

Direct Imaging with Hundreds of MeV Electron Bunches from Laser Wakefield Acceleration

Basic Concepts of Radiation Biology

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