A TLD-based ten channel system for the spectrometry of bremsstrahlung generated by laser-matter interaction

Horst, Felix; Fehrenbacher, G.; Radon, T.; Kozlova, E.; Rosmej, O.; Czarnecki, Damian; Schrenk, Oliver; Breckow, Joachim; Zink, Klemens

doi:10.1016/j.nima.2015.02.010

Cited by 10 publications

(14 citation statements)

References 17 publications

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“…The saturated IP signal in the case of the laser irradiation of foams (sh. 31,34,38,44), which was regularly detected in the IP-region with electron energies below 1 MeV, is probably caused by a strongly increased amount of laser accelerated electrons with E>6-8 MeV. These electrons having a large stopping range, penetrated directly the 5 mm thick front iron-wall of the electron spectrometer and were deflected by magnetic field in accordance with their final energy.…”

Section: Electron Spectramentioning

confidence: 96%

“…A thermo-luminescence dosimetry (TLD)-based ten channel system was used for the spectrometry of the hard bremsstrahlung caused by MeV electrons interacting with a 17 mm thick Fe-flange that separated the evacuated target chamber from the environment. Ten TLD-cards were placed inside a shielding cylinder with a collimator window between the absorbers, which are manufactured from lower to higher Z materials of different thickness [38]. The incident x-rays penetrate different absorbers and cause a corresponding TLD-signal (dose) in all ten cannels.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…27), and onto 300 and 500 μm thick CHO-foam targets (sh. 31,34,38,44) pre-ionized by the nspulse are presented in figure 4. The signals measured by the electron spectrometer ES1 placed 18°to the laser pulse propagation direction are shown on the left side of figure 4 and those measured by ES2 under 44°on the right side of figure 4.…”

Section: Electron Spectramentioning

confidence: 99%

“…A rather poor dispersion of the end-on IP, where signals from electrons with energies between 12 and 100 MeV are accumulated, still allowed for the registration of the pronounced effect of the effective laser energy coupling into electrons in NCD-plasmas and their acceleration up to tens of MeVs (see raw electron spectra measured by ES1 end-on IP for shots 31,34,38,44). Data from the absolute calibration of the image plates for relativistic electrons with energies up to 10 MeV and the dependence of the absolute signal on the electron angle of incidence onto the IP [41,42] were used to evaluate the number of electrons in different energy ranges.…”

Section: Electron Spectramentioning

confidence: 99%

“…The bremsstrahlung radiation (BS) was produced by MeV electrons passing through a 17 mm thick steel flange, located at a distance of 868 mm from the target in the laser pulse direction. An absolute calibrated tenchannel TLD-spectrometer [38] based on the method of thermo-luminescence dosimetry was used as a measurement tool for the bremsstrahlung. The ten TLD-cards were placed between absorbers inside a shielding cylinder with a collimator window.…”

Section: Measurements Of the Tld-doses Caused By Bremsstrahlung Radiamentioning

confidence: 99%

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Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays

et al. 2019

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Experiments were performed to study electron acceleration by intense sub-picosecond laser pulses propagating in sub-mm long plasmas of near critical electron density (NCD). Low density foam layers of 300-500 μm thickness were used as targets. In foams, the NCD-plasma was produced by a mechanism of super-sonic ionization when a well-defined separate ns-pulse was sent onto the foamtarget forerunning the relativistic main pulse. The application of sub-mm thick low density foam layers provided a substantial increase of the electron acceleration path in a NCD-plasma compared to the case of freely expanding plasmas created in the interaction of the ns-laser pulse with solid foils. The performed experiments on the electron heating by a 100 J, 750 fs short laser pulse of 2-5×10 19 W cm −2 intensity demonstrated that the effective temperature of supra-thermal electrons increased from 1.5-2 MeV in the case of the relativistic laser interaction with a metallic foil at high laser contrast up to 13 MeV for the laser shots onto the pre-ionized foam. The observed tendency towards a strong increase of the mean electron energy and the number of ultra-relativistic laseraccelerated electrons is reinforced by the results of gamma-yield measurements that showed a 1000fold increase of the measured doses. The experiment was supported by 3D-PIC and FLUKA simulations, which considered the laser parameters and the geometry of the experimental set-up. Both, measurements and simulations showed a high directionality of the acceleration process, since the strongest increase in the electron energy, charge and corresponding gamma-yield was observed close to the direction of the laser pulse propagation. The charge of super-ponderomotive electrons with energy above 30 MeV reached a very high value of 78 nC.

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Section: Electron Spectramentioning

confidence: 96%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Electron Spectramentioning

confidence: 99%

Section: Electron Spectramentioning

confidence: 99%

Section: Measurements Of the Tld-doses Caused By Bremsstrahlung Radiamentioning

confidence: 99%

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Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays

et al. 2019

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Making spectral shape measurements in inverse Compton scattering a tool for advanced diagnostic applications

Krämer

Jochmann

Budde³

et al. 2018

Sci Rep

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Interaction of relativistic electron beams with high power lasers can both serve as a secondary light source and as a novel diagnostic tool for various beam parameters. For both applications, it is important to understand the dynamics of the inverse Compton scattering mechanism and the dependence of the scattered light’s spectral properties on the interacting laser and electron beam parameters. Measurements are easily misinterpreted due to the complex interplay of the interaction parameters. Here we report the potential of inverse Compton scattering as an advanced diagnostic tool by investigating two of the most influential interaction parameters, namely the laser intensity and the electron beam emittance. Established scaling laws for the spectral bandwidth and redshift of the mean scattered photon energy are refined. This allows for a quantitatively well matching prediction of the spectral shape. Driving the interaction to a nonlinear regime, we spectrally resolve the rise of higher harmonic radiation with increasing laser intensity. Unprecedented agreement with 3D radiation simulations is found, showing the good control and characterization of the interaction. The findings advance the interpretation of inverse Compton scattering measurements into a diagnostic tool for electron beams from laser plasma acceleration.

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Compact spectroscopy of keV to MeV X-rays from a laser wakefield accelerator

Hannasch

García

Laberge

et al. 2021

Sci Rep

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We reconstruct spectra of secondary X-rays from a tunable 250–350 MeV laser wakefield electron accelerator from single-shot X-ray depth-energy measurements in a compact (7.5 × 7.5 × 15 cm), modular X-ray calorimeter made of alternating layers of absorbing materials and imaging plates. X-rays range from few-keV betatron to few-MeV inverse Compton to > 100 MeV bremsstrahlung emission, and are characterized both individually and in mixtures. Geant4 simulations of energy deposition of single-energy X-rays in the stack generate an energy-vs-depth response matrix for a given stack configuration. An iterative reconstruction algorithm based on analytic models of betatron, inverse Compton and bremsstrahlung photon energy distributions then unfolds X-ray spectra, typically within a minute. We discuss uncertainties, limitations and extensions of both measurement and reconstruction methods.

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A TLD-based ten channel system for the spectrometry of bremsstrahlung generated by laser-matter interaction

Cited by 10 publications

References 17 publications

Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays

Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays

Making spectral shape measurements in inverse Compton scattering a tool for advanced diagnostic applications

Compact spectroscopy of keV to MeV X-rays from a laser wakefield accelerator

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