Radiochromic film imaging spectroscopy of laser-accelerated proton beams

Nürnberg, F.; Schollmeier, M.; Brambrink, E.; Blazˇevic, A.; Carroll, D. C.; Flippo, K.; Gautier, D. C.; Geißel, M.; Harres, K.; Hegelich, B. M.; Lundh, O.; Markey, K.; McKenna, P.; Neely, D.; Schreiber, J.; Roth, M.
March 2009
Review of Scientific Instruments;Mar2009, Vol. 80 Issue 3, p033301
Academic Journal
This article reports on an experimental method to fully reconstruct laser-accelerated proton beam parameters called radiochromic film imaging spectroscopy (RIS). RIS allows for the characterization of proton beams concerning real and virtual source size, envelope- and microdivergence, normalized transverse emittance, phase space, and proton spectrum. This technique requires particular targets and a high resolution proton detector. Therefore thin gold foils with a microgrooved rear side were manufactured and characterized. Calibrated GafChromic radiochromic film (RCF) types MD-55, HS, and HD-810 in stack configuration were used as spatial and energy resolved film detectors. The principle of the RCF imaging spectroscopy was demonstrated at four different laser systems. This can be a method to characterize a laser system with respect to its proton-acceleration capability. In addition, an algorithm to calculate the spatial and energy resolved proton distribution has been developed and tested to get a better idea of laser-accelerated proton beams and their energy deposition with respect to further applications.


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