Speakers
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose
neutrino experiment currently under construction in Jiangmen, southwest China.
Its main detector consists of a acrylic sphere of 35.4m in diameter, filled with
20kt of liquid scintillator. JUNO features a broad physics program, with the
determination of the neutrino mass ordering as the primary goal. However, this
goal can only be reached if a thorough background control of the experiment is
carried out. Especially, the use of radiopure materials is of upmost importance
to reduce neutrino-signal mimicking bismuth-polonium decays.
For the purpose of monitoring radiopurity of liquid scintillator (LS) batches
during the months-long filling of JUNO, the Online Scintillator Internal Radioactivity
Investigation System (OSIRIS) was developed. OSIRIS features a
central, watershielded 3m x 3m acrylic vessel (AV) filled with 18 tons of LS. The
AV is instrumented with an array of 76 Large Photomultiplier Tubes (LPMTs).
For the calibration of OSIRIS, two independent and partially redundant systems
are employed:A picosecond Laser Calibration System utilising sub-ns single photon
pulses is used for precise calibrations of LPMT timing and charge responses
in the spe regime. An Automated Calibration Unit (ACU) from the Daya Bay
experiment is employed for the calibration of energy and vertex reconstructions
via radioactive sources. The ACU is also hosts an LED, used for redundant
calibrations of LPMT timing and charge responses.
This poster will describe the calibration systems of OSIRIS, the expected performance
of the two systems, simulated performance of the calibration and very
first results from the commissioning of the OSIRIS detector.
| Poster prize | Yes |
|---|---|
| Given name | Tobias |
| Surname | Sterr |
| First affiliation | Eberhard Karls Universität Tübingen |
| Institutional email | Tobias-Richard.Sterr@uni-tuebingen.de |
| Gender | Male |
