Radiological Safety Assessment for the Experimental Area of a Hyper-Intense Laser With Peak—power of 1pw—cetal

Florescu, Maria; Duliu, O. G.; Pantazi, Doina; Ticoş, C. M.; Sporea, D.; Vasilache, Radu A.; Ionescu, Virgil; Oane, Mihai

doi:10.1093/rpd/ncw274

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The experiments were performed using the PW class laser system from the CETAL-PW laboratory [15][16][17][18]. The 40 fs laser pulse with a diameter of about 200 mm is focused on the target at 45 • incidence angle with respect to the target normal, using an off-axis parabolic mirror with a focal length of 400 mm.…”

Section: Methodsmentioning

confidence: 99%

Advances in Spectral Distribution Assessment of Laser Accelerated Protons using Multilayer CR-39 Detectors

et al. 2019

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We show that a spectral distribution of laser-accelerated protons can be extracted by analyzing the proton track diameters observed on the front side of a second CR-39 detector arranged in a stack. The correspondence between the proton track diameter and the incident energy on the second detector is established by knowing that protons with energies only higher than 10.5 MeV can fully deposit their energy in the second CR-39 detector. The correlation between the laser-accelerated proton track diameters observed on the front side of the second CR-39 detector and the proton incident energy on the detector stack is also presented. By calculating the proton number stopped in the CR-39 stack, we find out that its dependence on the proton energy in the 1–15 MeV range presents some discontinuities at energies higher than 9 MeV. Thus, we build a calibration curve of the track diameter as a function of the proton incident energy within the 1–9 MeV range, and we infer the associated analytical function as the calculations performed indicate best results for proton spectra within the 1–9 MeV range. The calibration curve is used as a tool to ascertain the pits identified on the surfaces of both CR-39 detectors to proton tracks. The proton tracks spatial distribution analyzed by optical and atomic force microscopy is correlated with the peculiarity of the used targets.

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Section: Methodsmentioning

confidence: 99%

Advances in Spectral Distribution Assessment of Laser Accelerated Protons using Multilayer CR-39 Detectors

et al. 2019

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“…For a more complete radiological characterization of the LION experiment, computational studies of the residual induced activation, not covered in this manuscript, will also be performed. However, computational results by Florescu et al 38 show that the residual dose rate due to activation at a few cm from the surface of an aluminum-made vacuum chamber is comparable with the average natural outdoor radiation background already after three minutes of cooling time, when using 100 MeV mono-energetic protons and 10 14 protons per bunch. This result suggests that the contribution of activation to the total dose should be minimal, considering the primary source terms employed in this study.…”

Section: Discussionmentioning

confidence: 98%

Geant4 Monte Carlo simulation study of the secondary radiation fields at the laser-driven ion source LION

Tisi

Mares

Schreiber

et al. 2021

Sci Rep

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At the Center for Advanced Laser Applications (CALA), Garching, Germany, the LION (Laser-driven ION Acceleration) experiment is being commissioned, aiming at the production of laser-driven bunches of protons and light ions with multi-MeV energies and repetition frequency up to 1 Hz. A Geant4 Monte Carlo-based study of the secondary neutron and photon fields expected during LION’s different commissioning phases is presented. Goal of this study is the characterization of the secondary radiation environment present inside and outside the LION cave. Three different primary proton spectra, taken from experimental results reported in the literature and representative of three different future stages of the LION’s commissioning path are used. Together with protons, also electrons are emitted through laser-target interaction and are also responsible for the production of secondary radiation. For the electron component of the three source terms, a simplified exponential model is used. Moreover, in order to reduce the simulation complexity, a two-components simplified geometrical model of proton and electron sources is proposed. It has been found that the radiation environment inside the experimental cave is either dominated by photons or neutrons depending on the position in the room and the source term used. The higher the intensity of the source, the higher the neutron contribution to the total dose for all scored positions. Maximum neutron and photon ambient dose equivalent values normalized to 109 simulated incident primaries were calculated at the exit of the vacuum chamber, where values of about 85 nSv (109 primaries)−1 and 1.0 μSv (109 primaries)−1 were found.

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Human radiological safety assessment for petawatt laser-driven ion acceleration experiments in CLAPA-T

Zhang,

Zhao,

et al. 2024

Matter and Radiation at Extremes

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The newly built Compact Laser Plasma Accelerator–Therapy facility at Peking University will deliver 60 J/1 Hz laser pulses with 30 fs duration. Driven by this petawatt laser facility, proton beams with energy up to 200 MeV are expected to be generated for tumor therapy. During high-repetition operation, both prompt radiation and residual radiation may cause safety problems. Therefore, human radiological safety assessment before commissioning is essential. In this paper, we simulate both prompt and residual radiation using the Geant4 and FLUKA Monte Carlo codes with reasonable proton and as-produced electron beam parameters. We find that the prompt radiation can be shielded well by the concrete wall of the experimental hall, but the risk from residual radiation is nonnegligible and necessitates adequate radiation cooling. On the basis of the simulation results, we discuss the constraints imposed by radiation safety considerations on the annual working time, and we propose radiation cooling strategies for different shooting modes.

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Radiological Safety Assessment for the Experimental Area of a Hyper-Intense Laser With Peak—power of 1pw—cetal

Cited by 3 publications

References 8 publications

Advances in Spectral Distribution Assessment of Laser Accelerated Protons using Multilayer CR-39 Detectors

Advances in Spectral Distribution Assessment of Laser Accelerated Protons using Multilayer CR-39 Detectors

Geant4 Monte Carlo simulation study of the secondary radiation fields at the laser-driven ion source LION

Human radiological safety assessment for petawatt laser-driven ion acceleration experiments in CLAPA-T

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