Cornelius Vollbrecht M.Sc.

Cornelius Vollbrecht M.Sc.
  • PhD student, joined September 2019
  • Thesis Title: Hardware development and data analysis for the JUNO and OSIRIS detectors

Contact:
  • Phone (Jülich): +49 2461 61 4735
  • Phone (Aachen): +49 241 80 27328
  • E-mail: m.vollbrecht_AT_fz-juelich.de

Work - The OSIRIS detector

I am working on both hardware and software topics around the OSIRIS detector, a subdetector of the JUNO experiment. The main goal of OSIRIS is to evaluate the radiopurity of the JUNO liquid scintillator during the months-long filling phase of JUNO. Furthermore, OSIRIS will be used to detect air leaks and malfunctions in the liquid scintillator purification process.

Between 09/2019 and 01/2020, I have supported the Aachen hardware group with the production of the intelligent PMT system. During that time, I worked on the following topics:
  • Development and construction of a cleaning facility for OSIRIS parts from Germany
  • Design and simulation of holding structures for the iPMT system
  • Potting / glueing support for the iPMT system
  • Support of the iPMT production in 2021
Since 01/2022, I have been focusing on the calibration of the OSIRIS detector and the analysis of its data. My tasks involve:
  • Development of OSIRIS calibration and device control software
  • Simulation and analysis of OSIRIS data
  • Preparations for the OSIRIS commissioning phase in autumn 2022
Since mid of September 2022, I have been on-site at JUNO in China to actively take part in the commissioning of OSIRIS. I will stay at JUNO for about 3.5 months. Travelling with two other German experts, my main focus during that time is the calibration of OSIRIS. For that purpose, I will perform hardware-focused tasks such as calibrations of the calibration device mechanics or the installation of calibration sources inside the device. A more software-focused time period follows after that, during which I will perform dedicated calibration runs of the whole detector. The recorded data will then be analysed to learn as much as possible about the detector performance.
My travel is supported by the DAAD (Deutscher Akademischer Austauschdienst), which approved a PhD research scholarship for the time in China. For more information, please have a look at Awards.

Outreach

  • Foschungszentum Jülich: Tag der Neugier 2022
    Neutrinos - Rätselhafte Geisterteilchen
  • RWTH Aachen: Tag der Physik 2021
    JUNO & OSIRIS (for both Aachen and Jülich workgroups)

Awards

    PhD research scholarship for stays abroad with 3.5 months duration, granted by Deutscher Akademischer Austauschdienst (DAAD)

Selected events

  • The 20th JUNO collaboration meeting (Virtual, China, 2022)
    Parallel talk: Update on ACU calibration
  • Low Radioactivity Techniques Conference LRT 2022 (Rapid City, South Dakota, United States, 2022)
    Talk: OSIRIS: The Online Scintillator Internal Radioactivity Investigation System of JUNO
  • The International Conference on Neutrino Physics and Astrophysics (Virtual, Republic of Korea, 2022)
    Poster: OSIRIS: The Online Scintillator Internal Radioactivity Investigation System of JUNO
  • JUNO DFG meeting (Jülich, Germany, 2020)
    Parallel talk: OSIRIS calibration
  • DPG Spring Meeting (Virtual / Heidelberg, Germany, 2022)
    Parallel talk: Calibration of the JUNO pre-detector OSIRIS
  • The 19th JUNO collaboration meeting (Virtual, 2022)
    Parallel talk: OSIRIS cleaning report
  • JUNO European Meeting (Aachen, 2021)
    Parallel talk: Status update iPMT production & cleaning
  • European Physics Society Conference on High Energy Physics EPS-HEP (Virtual / Hamburg, Germany, 2021)
    Poster: OSIRIS – An online scintillator radiopurity monitor for the JUNO experiment
  • The 18th JUNO collaboration meeting (Virtual, China, 2021)
    Parallel talk: Cleaning for OSIRIS
  • JUNO European Meeting (Virtual, 2021)
    Parallel talk: Waveform reconstruction with the iPMT system of OSIRIS
  • DPG Spring Meeting (Virtual / Dortmund, Germany, 2021)
    Parallel talk: Cleaning for OSIRIS - Introduction to a cleaning facility on ultra pure water basis
  • The 17th JUNO collaboration meeting (Virtual, China, 2021)
    Parallel talk: Cleaning for OSIRIS - Status update on cleaning preparations in Aachen
  • JUNO DFG meeting (Jülich, Germany, 2020)
    Parallel talk: Cleaning for OSIRIS - Status update on cleaning preparations in Aachen
  • The 16th JUNO collaboration meeting (Virtual, China, 2020)
    Parallel talk: Cleaning of components in Aachen
  • The 15th JUNO collaboration meeting (Nanning, China, 2020)
    Parallel talk: Update iPMT-mechanics review

Selected Publications

Education

  • M.Sc. in Physics
    RWTH Aachen University
    Master Thesis: Verifikation der akustischen Positionierung der Autonomen Pinger-Einheiten des EnEx-RANGE-Projektes in Gletschereis
  • B.Sc. in Physics
    RWTH Aachen University
    Bachelor Thesis: Zur Bestimmung der akustischen Dämpfung von Ultraschall in Wasser im Frequenzbereich 100 − 800 kHz für die Vorfelderkundung des EnEx-RANGE-Projektes