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
Between mid 09/2022 and end 12/2022, I was on-site at JUNO in China to actively take part in the commissioning of OSIRIS. My main focus during that time was the Automated Calibration Unit (ACU) of OSIRIS, where I worked on control software development and mechanical tasks around the commissioning of the ACU. I also worked on other topics, such as mechanical tests for device holding structures, dust level measurements or the construction of a small-scale cleaning facility for OSIRIS.

My travel was 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

  • Upcoming: DPG Spring Meeting (Dresden, March 2023)
    Parallel talk: Calibration of the JUNO pre-detector OSIRIS
  • German JUNO Research Unit meeting (Mainz, Germany, 2022)
    Talk: Status of the OSIRIS LPMT integration
  • 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) -- Verifikation der akustischen Positionierung der Autonomen Pinger-Einheiten des EnEx-RANGE-Projektes in Gletschereis

  • B.Sc. in Physics (RWTH Aachen University) -- Zur Bestimmung der akustischen Dämpfung von Ultraschall in Wasser im Frequenzbereich 100 − 800 kHz für die Vorfelderkundung des EnEx-RANGE-Projektes