Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 70: Instrumentation XX
HK 70.2: Vortrag
Freitag, 18. März 2016, 14:30–14:45, S1/01 A3
Low Energy Proton Detector Using APDs for the PENeLOPE Experiment — •Dominic Gaisbauer1, Joachim Hartmann1, Igor Konorov1, Stephan Paul1, Rüdiger Picker2, Wolfgang Schreyer1, Dominik Steffen3, Rainer Stoepler1, and Christian Tietze1 — 1Technische Universität München, Garching, Germany — 2TRIUMF, Vancouver, Canada — 3CERN, Geneva, Switzerland
PENeLOPE is a neutron lifetime measurement at the Technische Universität München aiming to achieve a precision of 0.1 s. The detector for PENeLOPE consists of about 1250 Avalanche Photodiodes (APDs) with a total active area of 1225 cm2. The detector and electronics will be operated at a high electrostatic potential of -30 kV, and a magnetic field of 0.6 T. This includes shaper, preamplifier, ADC and FPGA stage. In addition the APDs will be cooled to 77 K. The 1250 APDs are divided into 14 groups of 96 channels, including spares. Each group is processed by one FPGA card which reads out the 12-bit ADCs with 1 MSps. A new firmware was developed for the detector including a self-triggering readout with continuous pedestal calculation and configurable signal detection. The data transmission and configuration is done via the Switched Enabeling Protocol (SEP). It is a time-division multiplexing low layer protocol which provides determined latency for time critical messages, IPBus, and JTAG interfaces. The network has a n:1 topology and thereby reduces the number of optical links.