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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.9: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Update of the High-Resolution Energy-Loss Electron Scattering Spectrometer at the S-DALINAC — •O. Burda, J. Enders, A. Lenhardt, P. von Neumann-Cosel, M. Platz, A. Richter, and S. Watzlawik — Institut für Kernphysik, Technische Universität Darmstadt, Germany

The 169 Energy-Loss Spectrometer at the S-DALINAC is used for high resolution electron scattering experiments. The spectrometer and its detector system in particular has undergone a complete redesign. The new detector system is now based on semiconductor microstrip detectors which deliver a high resolution defined only by the geometric configuration of the strip size. A new data acquisition system was developed which using highly sophisticated technologies like FPGAs, CPLDs and Embedded Systems. Here, the sequencer is synthesized in the CPLD while the memory management, discriminator and counting units make use of the FPGA. A RISK based Controller provides the interface between the FPGA, the CPLD and the data transmission path. The data transmission path itself is realized with well-known ethernet technologies and therefore allows to use standard user frontends for data processing. Browsers, for example, gives the possibility to observe the spectra online. With this setup, it is possible to carry out scattering experiments with a momentum resolution of Δ p/p=3×10−4 and event rates up to 160 kHz at a detection efficiency close to 100%.
Supported by the DFG under contract SFB 634.

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