München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Instrumentation V

HK 24.1: Talk

Tuesday, March 19, 2019, 14:00–14:15, HS 11

Development of a High Rate Neutron Polarimeter — •Rouven Spreckels — Institute for Nuclear Physics in Mainz, Germany

A high rate neutron polarimeter is being developed by the A1 collaboration at the Institute for Nuclear Physics in Mainz, Germany extending their three-spectrometer apparatus at MAMI. To meet the high rate capability and timing precision requirements, the signals of the plastic scintillators are discriminated by custom-made front-end electronics based on the ultrafast multi-channel NINO ASIC in single-ended mode, encoding the signal time-over-threshold into the output signal width. Digitization is performed by TRB3 boards with multi-hit capability covering a total of 574 channels. Their FPGA-based high precision TDCs measure leading as well as trailing edges of the NINO output signals and generate triggers on configurable veto and coincidence conditions with negligible dead time and hardware resources compared with conventional ADCs or sampling ASICs. The precise time-over-threshold information allows walk corrections and background suppression by reconstructing the signal amplitudes to deduce the related energy deposits. Initial tests of the readout electronics, using the 855 MeV electron beam of MAMI, show promising results fulfilling our expectations with a timing precision of about 240 ps being constant up to about 2.5 Mcps. A full test of the whole setup in its final stage will be performed in January 2019. Preliminary results from the commissioning experiments will be discussed in March 2019 at the DPG Spring Meeting in Munich.