Radiation Dose Measurements for High-Intensity Laser Interactions With Solid Targets at Slac

Liang, T.; Bauer, J. M.; Cimeno, M.; Ferrari, A.; Galtier, E.; Lee, H. J.; Liu, J.; Nagler, Bob; Prinz, A.; Rokni, S.H.; Tran, Henry; Woods, Mike

doi:10.1093/rpd/ncv505

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…Previous studies show that there were far more photons than other particles outside the target chamber. Some researchers measured the fluence of different kinds of particles and found the fluence of photons was about three orders of magnitude higher than that of neutrons (Liang et al 2016; Yang et al 2017b). By simulating the energy deposited by different particles in the detector, it could be found that at the same energy and the same fluence per area, photons could deposit more energy inside the diamond detector, and each photon can deposit 1 to 5 times as much energy as the neutron deposits.…”

Section: Methodsmentioning

confidence: 99%

“…It was found that almost all the active dosimeters available in the market, including ionization chambers, could not work properly in the radiation field with such an extremely high dose rate. The output values of active detectors were much smaller than that of passive detectors such as thermoluminescence dosimeter (TLD) detectors, which were considered to be accurate (Liang et al 2016). In 2016, Yang and colleagues measured the photon dose generated by an “XG-III” laser device using TLD detectors, optically stimulated luminescence (OSL) detectors, and 451P ionization chambers, and the results indicated that the ionization chambers underestimate the surrounding dose by one to two orders of magnitude compared to the TLD and OSL detectors (Yang et al 2017a; Yang 2018).…”

Section: Introductionmentioning

confidence: 99%

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An Active Dose Measurement Device for Ultra-short, Ultra-intense Laser Facilities

et al. 2022

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Ultra-short, ultra-intense laser facilities could produce ultra-intense pulsed radiation fields. Currently, only passive detectors are fit for dose measurement in this circumstance. Since the laser device could generate a dose up to tens of mSv outside the chamber in tens of picoseconds, resulting in a high instantaneous dose rate of ~107 Sv s−1, it is necessary to perform real-time dose measurement to ensure the safety of nearby workers. Due to fast response and excellent radiation resistance, a diamond-based dose measurement device was designed and developed, and its dose-rate response and its feasibility for such occasions were characterized. The measurement results showed that the detector had a good dose-rate linearity in the range of 3.39 mGy h−1 to 10.58 Gy h−1 for an x-ray source with energy of 39 keV to 208 keV. No saturation phenomenon was observed, and the experimental results were consistent with the results obtained from Monte Carlo simulation. The charge collection efficiency was about 80%. Experimental measurements and simulations with this dose measurement device were carried out based on the “SG-II” laser device. The experimental and simulation results preliminarily verified the feasibility of using the diamond detector to measure the dose generated by ultra-short, ultra-intense laser devices. The results provided valuable information for the follow-up real-time dose measurement work of ultra-short, ultra-intense laser devices.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Active Dose Measurement Device for Ultra-short, Ultra-intense Laser Facilities

et al. 2022

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“…Here we try to scale up the radiation doses obtained at TW to sub-PW regime using the dependency between hot electron temperature and the laser intensity. According to the studies on 2014 SLAC-MEC experiments using 25 TW laser [108,109], the hot electron temperature T h was proportional to the square-root of laser intensity. In a 40 TW laser experiment at HI Jena, the hot plasma in Ti bulk was created and the x-ray spectra were studied [110].…”

Section: Appendix B Possible Noise Sourcesmentioning

confidence: 99%

Axion-like particle generation in laser-plasma interaction

Huang¹,

Shen²,

Bu³

et al. 2022

Phys. Scr.

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The hypothetical axion and axion-like particles, feebly coupled with photon, have not yet been found in any experiment. With the improvement of laser technique, much stronger quasi-static electric and magnetic fields can be created in laboratory using laser-plasma interaction and help the search of axion. In this article, we discuss the feasibility of ALPs exploration using planarly or cylindrically symmetric laser-plasma fields as the background and an x-ray free-electron laser as the probe. Compared to the fields by large magnets, the laser-plasma fields provide much stronger but shorter interaction. Both the probe and the background fields are polarized such that the existence of ALPs in the corresponding parameter space will cause polarization rotation of the probe, which can be detected with high accuracy. Besides, a structured field in the plasma creates a tunable transverse profile for the interaction and improves the signal-noise ratio via phase-matching mechanism. The ALP mass discussed in this article ranges from 10−3 eV to 1 keV. Some simple schemes and estimations on ALP production and polarization rotation of probe photon are given, which reveals the possibility of future laser-plasma ALP source in laboratory.

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“…In the past years, multiple experiments have been carried out on several laser facilities, like Omega EP [20], LLNL-Titan [34], Vulcan [35,36], Texas [37] SLAC's MEC [38], XGIII [39] and Trident [40] for bremsstrahlung radiation investigation. The characteristics were also investigated by means of particle-in-cell (PIC) simulations [23,24,31,41].…”

Section: Introductionmentioning

confidence: 99%

Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction

Ren¹,

Wu²,

Hoffmann³

et al. 2019

Plasma Phys. Control. Fusion

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Fast electron transport as well as bremsstrahlung emissions induced by relativistic intense laser solid interactions are investigated with a newly developed particle-in-cell (PIC) simulation code. This PIC code is capable of simulating intense laser-solid interactions by taking into account many coupled physical processes, like laser-plasma interaction, ionization dynamics, collisional dynamics, electron transport and photon emission. The target effects can be distinguished according to their intrinsic atomic properties. In this work, aluminium, copper, and gold targets with different thickness are considered. It is shown that with the fixed laser intensity of 10 20 W cm −2 , the angular distribution of bremsstrahlung emission, significantly depends on target material and target thickness. For low Z material, the electrons and the emitted photons tend to be collimated along the laser propagation direction. For high Z material, the angular distribution is broader, which is attributed to the self-generated resistive magnetic field-induced electron momentum divergence. Moreover, the simulation result shows that for Al target, the total emission energy increases with decreasing target thickness, because electron refluxing induces considerable backward emission. Comparatively, for Au target, the electron refluxing effect on the total emission energy can be ignored, because the backward emission is somewhat buried within the broad distribution.

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Radiation Dose Measurements for High-Intensity Laser Interactions With Solid Targets at Slac

Cited by 10 publications

References 20 publications

An Active Dose Measurement Device for Ultra-short, Ultra-intense Laser Facilities

An Active Dose Measurement Device for Ultra-short, Ultra-intense Laser Facilities

Axion-like particle generation in laser-plasma interaction

Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction

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