Improved spectral data unfolding for radiochromic film imaging spectroscopy of laser-accelerated proton beams
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
An improved method to unfold the space-resolved proton energy distribution function of laser-accelerated proton beams using a layered, radiochromic film (RCF) detector stack has been developed. The method takes into account the reduced RCF response near the Bragg peak due to a high linear energy transfer (LET). This LET dependence of the active RCF layer has been measured, and published data have been re-interpreted to find a nonlinear saturation scaling of the RCF response with stopping power. Accounting for the LET effect increased the integrated particle yield by 25% after data unfolding. An iterative, analytical, space-resolved deconvolution of the RCF response functions from the measured dose was developed that does not rely on fitting. After the particle number unfold, three-dimensional interpolation is performed to determine the spatial proton beam distribution for proton energies in-between the RCF data points. Here, image morphing has been implemented as a novel interpolation method that takes into account the energy-dependent, changing beam topology.
- OSTI ID:
- 22254926
- Journal Information:
- Review of Scientific Instruments, Vol. 85, Issue 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
SU-E-T-665: Radiochromic Film Quenching Effect Reduction for Proton Beam Dosimetry
Radiochromic film imaging spectroscopy of laser-accelerated proton beams