A plasma wiggler beamline for 100 TW to 10 PW lasers

Kneip, S.; Najmudin, Z.; Thomas, Alexander

doi:10.1016/j.hedp.2011.12.001

Cited by 12 publications

(7 citation statements)

References 72 publications

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“…The models for the electron energy, x-ray critical energy, and density dependence of the x-ray brightness are all consistent with the experimental data using the single fitting parameter S. Figure 5 compares our measured E c and B 0 with previous experiments. Kneip, Najmudin, and Thomas [28] calculated the following scaling laws in terms of the laser power P (in TW) for both E c (in keV) and B 0 [in photons s −1 mrad −2 mm −2 ð0.1% BWÞ −1 ]:…”

Section: Fig 2 Variation Of Electron and X-ray Beams As A Function Ofmentioning

confidence: 99%

Bright x-ray radiation from plasma bubbles in an evolving laser wakefield accelerator

Bloom

Streeter

Kneip

et al. 2020

Phys. Rev. Accel. Beams

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We show that the properties of the electron beam and bright x rays produced by a laser wakefield accelerator can be predicted if the distance over which the laser self-focuses and compresses prior to self-injection is taken into account. A model based on oscillations of the beam inside a plasma bubble shows that performance is optimized when the plasma length is matched to the laser depletion length. With a 200 TW laser pulse, this results in an x-ray beam with a median photon energy of 20 keV, > 6 × 10 8 photons above 1 keV per shot, and a peak brightness of 3 × 10 22 photons s −1 mrad −2 mm −2 ð0.1% BWÞ −1 .

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Section: Fig 2 Variation Of Electron and X-ray Beams As A Function Ofmentioning

confidence: 99%

Bright x-ray radiation from plasma bubbles in an evolving laser wakefield accelerator

Bloom

Streeter

Kneip

et al. 2020

Phys. Rev. Accel. Beams

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“…As an intense laser pulse propagates through a gas, electrons are trapped and accelerated to extremely high energies (~GeV) within a short distance (~1 cm). These electrons also oscillate and emit an extremely short (~femtosecond), bright coherent x-ray pulse in the forward direction [1] that can be used for imaging applications. Modern petawatt lasers can be constructed with a footprint as small as a standard research laboratory, thus this x-ray source has been dubbed a tabletop laser synchrotron (Fig.…”

Section: Laser Driven X-ray Sourcementioning

confidence: 99%

High-resolution Tomographic Imaging Using Coherent Hard x-rays From Compact Laser Driven Accelerators

Symes

Najmudin

Cole

et al. 2016

High-Brightness Sources and Light-Driven Interactions

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Abstract:Extremely bright coherent femtosecond x-ray pulses are generated in compact laserdriven electron accelerators. Micro-tomography obtained with the Gemini laser indicates the usefulness of these sources in research and clinical applications.OCIS codes: (140.7090) Ultrafast lasers; (170.7440) X-ray imaging. Laser driven x-ray sourceThe acceleration of electrons in gas targets is a core research activity on short pulse (<100 fs) petawatt-class (1PW=10 15 W) laser systems. As an intense laser pulse propagates through a gas, electrons are trapped and accelerated to extremely high energies (~GeV) within a short distance (~1 cm). These electrons also oscillate and emit an extremely short (~femtosecond), bright coherent x-ray pulse in the forward direction [1] that can be used for imaging applications. Modern petawatt lasers can be constructed with a footprint as small as a standard research laboratory, thus this x-ray source has been dubbed a tabletop laser synchrotron (Fig. 1). The electrons generate a broad polychromatic x-ray spectrum with a critical energy up to 50 keV (similar to a synchrotron spectrum) and a peak brightness comparable with large-scale synchrotron light sources. This provides sufficient intensity to obtain an image using a single pulse [2] and so the image acquisition rate is limited only by the repetition rate of the drive laser pulses. The increase in repetition rate of petawatt lasers to 10 Hz in the near future opens up exciting possibilities for applying these extremely bright compact sources for research, pre-clinical and clinical imaging. High resolution x-ray imagingAs shown in Fig. 1, after the laser interaction electrons are swept away using a large permanent magnet and samples are placed in the x-ray beam to obtain point-projection images on a detector placed some distance (several metres) away. The magnification can be changed by altering the position of the sample relative to the source. Because the xray source size is determined by the magnitude of oscillation of the electrons, which is of order 1 µm, the spatial resolution of the imaging is very high. It is therefore suitable for challenging biological imaging that requires resolution at the cellular level. As well as x-ray absorption imaging the spatial coherence of the source enables phase contrast imaging (PCI) by detecting the slight deflections of x-rays by refractive index gradients. The more widespread use of PCI for medical imaging is being pursued [3] because it is superior in distinguishing between soft tissues where attenuation imaging quality is poor (particularly for mammography) and also because it has the potential for a lower patient dose during a scan.

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“…Recently, dispersion relation and growth rates of the plasma wave pumped free-electron laser have been investigated by Jafari et al [27]. Other theoretical efforts were concentrated on plasma wave pumped FELs [28][29][30], however, only a few attempts were made to analyze dusty plasmas in FELs: the possibility of using dusty plasma for x-ray generation by ultra-relativistic electron beams has been investigated by Namiot and Lopaev [31]. Besides, the generation of stimulated emission from a relativistic beam by magnetized dusty plasma crystals has been proposed by Selemir and Dubinov [32], and Mehdian et al [33].…”

Section: Introductionmentioning

confidence: 99%

Low-frequency wiggler modes in the free-electron laser with a dusty magnetoplasma medium

Jafari¹

2015

Laser Phys. Lett.

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An advanced incremental scheme for generating tunable coherent radiation in a freeelectron laser has been presented: the basic concept is the use of a relativistic electron beam propagating through a magnetized dusty plasma channel where dust helicon, dust Alfven and coupled dust cyclotron-Alfven waves can play a role as a low-frequency wiggler, triggering coherent emissions. The wiggler wavelength at the sub-mm level allows one to reach the wavelength range from a few nm down to a few Å with moderately relativistic electrons of kinetic energies of a few tens/hundreds of MeV. The laser gain and the effects of beam selfelectric and self-magnetic fields on the gain have been estimated and compared with findings of the helical magnetic and electromagnetic wigglers in vacuum. To study the chaotic regions of the electron motion in the dusty plasma wave wiggler, a time independent Hamiltonian has been obtained. The Poincare surface of a section map has been used numerically to analyze the nonintegrable system where chaotic regions in phase-space emerge. This concept opens a path toward a new generation of synchrotron sources based on compact plasma structures.

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A plasma wiggler beamline for 100 TW to 10 PW lasers

Cited by 12 publications

References 72 publications

Bright x-ray radiation from plasma bubbles in an evolving laser wakefield accelerator

Bright x-ray radiation from plasma bubbles in an evolving laser wakefield accelerator

High-resolution Tomographic Imaging Using Coherent Hard x-rays From Compact Laser Driven Accelerators

Low-frequency wiggler modes in the free-electron laser with a dusty magnetoplasma medium

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