Absolute charge calibration of scintillating screens for relativistic electron detection

Buck, A. and Zeil, K. and Popp, A. and Schmid, K. and Jochmann, A. and Kraft, S. D. and Hidding, B. and Kudyakov, T. and Sears, C. M.S. and Veisz, L. and Karsch, S. and Pawelke, J. and Sauerbrey, R. and Cowan, T. and Krausz, F. and Schramm, U. (2010) Absolute charge calibration of scintillating screens for relativistic electron detection. Review of Scientific Instruments, 81 (3). 033301. ISSN 1089-7623

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    Abstract

    We report on new charge calibrations and linearity tests with high-dynamic range for eight different scintillating screens typically used for the detection of relativistic electrons from laser-plasma based acceleration schemes. The absolute charge calibration was done with picosecond electron bunches at the ELBE linear accelerator in Dresden. The lower detection limit in our setup for the most sensitive scintillating screen (KODAK Biomax MS) was 10 fC/ mm 2. The screens showed a linear photon-to-charge dependency over several orders of magnitude. An onset of saturation effects starting around 10-100 pC/ mm2 was found for some of the screens. Additionally, a constant light source was employed as a luminosity reference to simplify the transfer of a one-time absolute calibration to different experimental setups.