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T: Fachverband Teilchenphysik

T 63: Detector Systems II

T 63.3: Vortrag

Mittwoch, 17. März 2021, 16:30–16:45, Tm

The intelligent PMTs for OSIRIS — Feng Gao¹, Achim Stahl¹, •Jochen Steinmann¹, Cornelius Vollbrecht^1,2, and Christian Wysotzki¹ — ¹RWTH Aachen University - Physics Institute III B, Aachen, Germany — ²Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2, Jülich, Germany

The Online Scintillator Internal Radioactivity Investigation System (OSIRIS) allows an on the fly radiopurity measurement of the scintillator during filling of the JUNO detector. It consists of a 20 ton liquid scintillator target monitored by 76 intelligent photomultiplier tubes (iPMTs).

In the novel approach of the iPMT, all electronics required for the PMT operation are directly attached to its back. It includes an FPGA for control of the PMT and processing of the data. This reduces analog signal cable length to the absolute minimum and creates a very scalable system.

Each iPMT is connected via a single standard CAT5 Ethernet cable to the backend, where the cable is splitted into a synchronisation signal and the Ethernet part. The Ethernet wires are connected to a Power over Ethernet switch to supply the whole iPMT and integrate it into the DAQ and slow-control network.

This talk presents the concept of the iPMT and its realisation within OSIRIS.