Absolute calibration of GafChromic film for very high flux laser driven ion beams

Ji, Bin; Ji, Qing; Seidl, P.A.; Raftrey, David; Steinke, S.; Persaud, A.; Nakamura, Kei; Gonsalves, A. J.; Leemans, Wim; Schenkel, T.

doi:10.1063/1.5086822

Cited by 20 publications

(13 citation statements)

References 37 publications

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“…Several works carried out to study the RCF dose rate dependence confirmed that RCFs can be considered dose rate independent over a wide dose range [89,100,101]. Bin et al reported on absolute calibration measurements for HD-V2 Gafchromic™ films in extremely high dose rate, approaching 7 × 10 11 Gy/s, for laserdriven ion beams [102]. RCF radiation type and energy dependence has been deeply investigated over the last few years mainly for the RCF types used in medical dosimetry, such as Gafchromic™ EBT series and XRQA-2.…”

Section: Radiochromic Films Response To Relevant Physical Quantitiesmentioning

confidence: 98%

Radiochromic Films for the Two-Dimensional Dose Distribution Assessment

Casolaro

2021

Applied Sciences

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Radiochromic films are mainly used for two-dimensional dose verification in photon, electron, and proton therapy treatments. Moreover, the radiochromic film types available today allow their use in a wide dose range, corresponding to applications from low-medical diagnostics to high-dose beam profile measurements in charged particle medical accelerators. An in-depth knowledge of the characteristics of radiochromic films, of their operating principles, and of the dose reading techniques is of paramount importance to exploit all the features of this interesting and versatile radiation detection system. This short review focuses on these main aspects by considering the most recent works on the subject.

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Section: Radiochromic Films Response To Relevant Physical Quantitiesmentioning

confidence: 98%

Radiochromic Films for the Two-Dimensional Dose Distribution Assessment

Casolaro

2021

Applied Sciences

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“…Calibration of the films is another important issue and would require tests at a facility where the delivered dose can be accurately determined. Other groups have performed similar experiments, see for example [34] and [35]. 10 and 11 show a comparison of the beta function (which gives the beam envelope as a function of distance along the beam-line) from the beam optics design, which was performed using BeamOptics, and the beta values after each element in the BDSIM simulation.…”

Section: End Stationmentioning

confidence: 99%

Simulation of a radiobiology facility for the Centre for the Clinical Application of Particles

et al. 2019

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The Centre for the Clinical Application of Particles' Laser-hybrid Accelerator for Radiobiological Applications (LhARA) facility is being studied and requires simulation of novel accelerator components (such as the Gabor lens capture system), detector simulation and simulation of the ion beam interaction with cells. The first stage of LhARA will provide protons up to 15 MeV for in vitro studies. The second stage of LhARA will use a fixed-field accelerator to increase the energy of the particles to allow in vivo studies with protons and in vitro studies with heavier ions.BDSIM, a Geant4 based accelerator simulation tool, has been used to perform particle tracking simulations to verify the beam optics design done by BeamOptics and these show good agreement. Design parameters were defined based on an EPOCH simulation of the laser source and a series of mono-energetic input beams were generated from this by BDSIM. The tracking results show the large angular spread of the input beam (0.2 rad) can

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“…After exposure, the pieces of film were digitized with an Epson V850 Pro flatbed scanner with 600dpi resolution. The raw RCF signal was first converted to optical density (OD=−log 10 (Exposed Signal/Unexposed Signal)) and then to deposited dose [40,41] in order to retrieve the proton fluence.…”

Section: Pulse Durationmentioning

confidence: 99%

Proton beam emittance growth in multipicosecond laser-solid interactions

et al. 2019

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High intensity laser-solid interactions can accelerate high energy, low emittance proton beams via the target normal sheath acceleration (TNSA) mechanism. Such beams are useful for a number of applications, including time-resolved proton radiography for basic plasma and high energy density physics studies. In experiments using the OMEGA EP laser system, we perform the first measurements of TNSA proton beams generated by up to 100 ps, kilojoule-class laser pulses with relativistic intensities. By systematically varying the laser pulse duration, we measure degradation of the accelerated proton beam quality as the pulse length increases. Two dimensional particle-in-cell simulations and simple scaling arguments suggest that ion motion during the rise time of the longer pulses leads to extended preformed plasma expansion from the rear target surface and strong filamentary field structures which can deflect ions away from uniform trajectories and therefore lead to large emittance growth.

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Absolute calibration of GafChromic film for very high flux laser driven ion beams

Abstract: Raman spectrometer for the automated scan of large painted surfaces Review of Scientific Instruments 90, 053101 (2019);

Cited by 20 publications

References 37 publications

Radiochromic Films for the Two-Dimensional Dose Distribution Assessment

Radiochromic Films for the Two-Dimensional Dose Distribution Assessment

Simulation of a radiobiology facility for the Centre for the Clinical Application of Particles

Proton beam emittance growth in multipicosecond laser-solid interactions

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