Demonstration of the ultrafast nature of laser produced betatron radiation

Phuoc, K. Ta; Fitour, R.; Tafzi, Amar; Garl, T.; Artemiev, Nikolay A.; Shah, Rahul; Albert, F.; Boschetto, D.; Rousse, A.; Kim, D.-E.; Pukhov, A.; Seredov, V.; Kostyukov, I. Yu.

doi:10.1063/1.2754624

Cited by 72 publications

(59 citation statements)

References 27 publications

(23 reference statements)

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“…Synchrotron radiation from an LWFA was demonstrated experimentally and has been intensely studied by Rousse and co-workers [95,[101][102][103][104]. The time duration of LWFA synchrotron x-rays was found to be as short as 100 fs.…”

Section: Coulomb In a Very Short Time Duration ( Plasma Period ∼ 10 Fmentioning

confidence: 94%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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Section: Coulomb In a Very Short Time Duration ( Plasma Period ∼ 10 Fmentioning

confidence: 94%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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“…Because of the fields resulting from charge separation, electrons trapped in this 'bubble' are longitudinally accelerated up to relativistic energies and, if off axis, undergo oscillations, inducing radiation emission with a broadband synchrotron-like energy spectrum (hence the betatron -or tron -appellation) (figure 4). This process has been widely studied at LOA [6]. Using a 30 TW laser focused onto a helium gas jet (at density close to 10 19 /cm 3 ), A. Rousse and co-workers succeeded in accelerating electrons up to 200 MeV and producing a rather collimated (∼ 20 mrad) and brief (estimated to be less than 100 fs) tron source with more than 10 8 photons above E th (405 eV for nitrogen and 870 eV for neon: figure 5).…”

Section: Description Of the Betatron Pump Sourcementioning

confidence: 99%

Inner-shell photo-ionisation x-ray lasing

Jacquemot

Ribière

Rousse

et al. 2011

UVX 2010 - 10e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Abstract. In this paper, we study the possibility to produce femtosecond monochromatic coherent ("x-ray laser") pulses in the keV range from inner-shell photo-ionisation of a gaseous medium by a laser-driven betatron pump source. A collisional-radiative model and a radiative transfer post-processor have been built to determine the lasing plasma kinetics, assess the local gain coefficient along the K transition in the ASE regime, and finally compute the x-ray laser intensity at saturation, to infer the key parameters for an experimental demonstration.

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“…Several schemes have been proposed and/or demonstrated to generate an ultrashort keV xray pulse: the relativistic Doppler shift of a backscattered laser pulse by a relativistic electron beam Hartemann, 1998;Esarey et al, 1993a;Chung et al, 2009), the harmonic frequency upshift of a laser pulse by relativistic nonlinear motion of electrons (Vachaspati, 1962;Brown & Kibble, 1964;Esarey et al,, 1992;Chen et al, 1998Chen et al, , 2000Ueshima et al, 1999;Kaplan & Shkolnikov, 2002;Banerjee et al, 2002;Lee et al, 2003aLee et al, , 2003bLee et al, , 2005Lee et al, , 2008Phuoc et al, 2003;Kim et al, 2009), high order harmonic generation in the interaction of intense laser pulse with solids (Linde et al, 1995(Linde et al, , 1996Norreys et al, 1996;Lichters et al, 1996;Tarasevitch et al, 2000) and x-ray laser using inner shell atomic transitions (Kim et al, 1999(Kim et al, , 2001. Ultrafast high-intensity X-rays can be generated from the interaction of high intensity femtosecond laser via Compton backscattering (Hartemann et al, 2005), relativistic nonlinear Thomson scattering (Ueshima et al, 1999;Kaplan & Shkolnikov 2002;Banerjee et al, 2002) and laser-produced betatron radiation (Phuoc et al, 2007). In synchrotron facilities, electron bunch slicing method has been adopted for experiments (Schoenlein, 2000;Beaud et al, 2007).…”

Section: Introductionmentioning

confidence: 99%