Betatron oscillations of electrons accelerated in laser wakefields characterized by spectral x-ray analysis

Albert, F.; Shah, Rahul; Phuoc, K. Ta; Fitour, R.; Burgy, F.; Rousseau, Jean‐Philippe; Tafzi, Amar; Douillet, D.; Lefrou, T.; Rousse, A.

doi:10.1103/physreve.77.056402

Cited by 64 publications

(62 citation statements)

References 30 publications

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“…The concept of a plasma wiggler was discussed theoretically [26,31], with the first experiments subsequently being carried out to characterize the beam divergence, keV energy range, broad spectral width [27], source size [32], detailed spectral shape [33,34], betatron oscillation amplitude [35,36] and pulse duration [37,38]. Methods to influence the betatron spectrum by tuning the oscillation amplitude, at ultra-relativistic laser intensities (directlaser-acceleration) [28], with density-tailored plasmas [39] and with laser profile shaping [40] have been discussed and experimentally implemented, demonstrating good control over the betatron mechanism.…”

Section: The Plasma Bubble Wiggler E a Source Of Betatron/ Synchrotromentioning

confidence: 99%

A plasma wiggler beamline for 100 TW to 10 PW lasers

Kneip¹,

Najmudin²,

Thomas³

2012

High Energy Density Physics

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Section: The Plasma Bubble Wiggler E a Source Of Betatron/ Synchrotromentioning

confidence: 99%

A plasma wiggler beamline for 100 TW to 10 PW lasers

Kneip¹,

Najmudin²,

Thomas³

2012

High Energy Density Physics

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“…Accounting for the dependencies of the various parameters, E crit is found to scale approximately linearly with laser power and inverse plasma density [26]. The x-ray source size is determined by the average betatron oscillation radius r β , previously measured directly [27,28] and indirectly [29,30] to be as low as 1 µm. This compares favourably to commerciallyavailable microfocus tubes, which typically operate at minimum source sizes nearer 5 µm.…”

Section: Introductionmentioning

confidence: 99%

Tomography of human trabecular bone with a laser-wakefield driven x-ray source

Cole

Wood

Lopes

et al. 2015

Plasma Phys. Control. Fusion

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Abstract. A laser-wakefield driven x-ray source is used for the radiography of human bone. The betatron motion of accelerated electrons generates x-rays which are hard (critical energy E crit > 30 keV), have small source size (< 3µm) and high average brightness. The x-rays are generated from a helium gas cell which is near-instantly replenishable, and thus the average photon flux is limited by the repetition rate of the driving laser rather than the breakdown of the x-ray source. A tomograph of a human bone sample was recorded with a resolution down to 50 µm. The photon flux was sufficiently high that a radiograph could be taken with each laser shot, and the fact that x-ray beams were produced on 97% of shots minimised failed shots and facilitated full micro-computed tomography in a reasonable time scale of several hours, limited only by the laser repetition rate. The x-ray imaging beamline length (not including the laser) is shorter than that of a synchrotron source due to the high accelerating fields and small source size. Hence this interesting laboratory-based source may one day bridge the gap between small microfocus x-ray tubes and large synchrotron facilities.

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“…12 In such a laser wakefield accelerator (LWFA), electrons trapped by the wakefield would witness an ultrahigh acceleration field of 100 GV/m and simultaneously experience the transverse focusing field of the wake and emit bright highenergy x-rays through the betatron radiation mechanism. [13][14][15] The properties of betatron radiation are normally characterized by the strength parameter [14][15][16] …”

mentioning

confidence: 99%

Enhanced betatron radiation by steering a laser-driven plasma wakefield with a tilted shock front

Liu

Wang

et al. 2018

Applied Physics Letters

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We have experimentally realized a scheme to enhance betatron radiation by manipulating transverse oscillation of electrons in a laser-driven plasma wakefield with a tilted shock front (TSF). Very brilliant betatron x-rays have been produced with significant enhancement both in photon yield and peak energy but almost maintain the e-beam energy spread and charge. Particle-in-cell simulations indicate that the accelerated electron beam (e beam) can acquire a very large transverse oscillation amplitude with an increase in more than 10-fold, after being steered into the deflected wakefield due to the refraction of the driving laser at the TSF. Spectral broadening of betatron radiation can be suppressed owing to the small variation in the peak energy of the low-energy-spread e beam in a plasma wiggler regime. It is demonstrated that the e-beam generation, refracting, and wiggling can act as a whole to realize the concurrence of monoenergetic e beams and bright x-rays in a compact laser-wakefield accelerator.

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Betatron oscillations of electrons accelerated in laser wakefields characterized by spectral x-ray analysis

Cited by 64 publications

References 30 publications

A plasma wiggler beamline for 100 TW to 10 PW lasers

A plasma wiggler beamline for 100 TW to 10 PW lasers

Tomography of human trabecular bone with a laser-wakefield driven x-ray source

Enhanced betatron radiation by steering a laser-driven plasma wakefield with a tilted shock front

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