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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.36: Poster
Dienstag, 9. März 2004, 13:30–15:30, Foyer
A VME module for Digital Pulse Processing — •Martin Lauer1, Vinzenz Bildstein1, Hans Boie1, Frank Köck1, Ian Lazarus2, Oliver Niedermaier1, Uttam Pal1, Heiko Scheit1, and Dirk Schwalm1 — 1MPI für Kernphysik, Heidelberg, Germany — 2Daresbury Laboratory, Warrington, UK
An algorithm to determine the energy of a γ ray from digitized preamplifier signals was implemented on a four channel VME card with 14 bit, 80 MHz digitizers and XILINX Spartan 2 [1] Field Programmable Gate Arrays (FPGA) for signal processing. In addition the firmware of the GRT4 card (Gamma-Ray Tracking 4 channel) [2] was extended by a module to trigger on the leading edge of the signal. The Moving Window Deconvolution (MWD) algorithm [3] was used, which transforms the preamplifier signal into a trapezoidal shape, the preferred shape for high-rate and high-resolution γ ray spectroscopy. The implementation also includes the digital equivalent of a baseline restorer to remove any offset from the spectra. The free XILINX WebPACK [1] software was used to generate the programming information for the FPGA from a VHSIC (Very High Speed Integrated Circuit) Hardware Description Language (VHDL) design. The pulse processing capabilities of the GRT4 module and the MWD implementation will be presented, as well as results obtained with HPGe detector signals as input to the GRT4.
[1] www.xilinx.com
[2] http://nnsa.dl.ac.uk/GRT/grt4 brochure.pdf
[3] J. Stein et al. NIM B 113 (1996) 141-145