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Open Access Publications from the University of California

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

  • Author(s): Bin, JH
  • Ji, Q
  • Seidl, PA
  • Raftrey, D
  • Steinke, S
  • Persaud, A
  • Nakamura, K
  • Gonsalves, A
  • Leemans, WP
  • Schenkel, T
  • et al.

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We report on the calibration of GafChromic HD-v2 radiochromic film in the extremely high dose regime up to 100 kGy together with very high dose rates up to 7 × 1011 Gy/s. The absolute calibration was done with nanosecond ion bunches at the Neutralized Drift Compression Experiment II particle accelerator at Lawrence Berkeley National Laboratory (LBNL) and covers a broad dose dynamic range over three orders of magnitude. We then applied the resulting calibration curve to calibrate a laser driven ion experiment performed on the BELLA petawatt laser facility at LBNL. Here, we reconstructed the spatial and energy resolved distributions of the laser-accelerated proton beams. The resulting proton distribution is in fair agreement with the spectrum that was measured with a Thomson spectrometer in combination with a microchannel plate detector.

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