Absolute response of Fuji imaging plate detectors to picosecond-electron bunches

Zeil, K. and Kraft, S. D. and Jochmann, A. and Kroll, F. and Jahr, W. and Schramm, U. and Karsch, L. and Pawelke, J. and Hidding, B. and Pretzler, G. (2010) Absolute response of Fuji imaging plate detectors to picosecond-electron bunches. Review of Scientific Instruments, 81 (1). 013307. ISSN 1089-7623

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    The characterization of the absolute number of electrons generated by laser wakefield acceleration often relies on absolutely calibrated FUJI imaging plates (IP), although their validity in the regime of extreme peak currents is untested. Here, we present an extensive study on the dependence of the sensitivity of BAS-SR and BAS-MS IP to picosecond electron bunches of varying charge of up to 60 pC, performed at the electron accelerator ELBE, making use of about three orders of magnitude of higher peak intensity than in prior studies. We demonstrate that the response of the IPs shows no saturation effect and that the BAS-SR IP sensitivity of 0.0081 photostimulated luminescence per electron number confirms surprisingly well data from previous works. However, the use of the identical readout system and handling procedures turned out to be crucial and, if unnoticed, may be an important error source.