This JRA concentrates on the development of particle identification solutions using the Detection of Internally Reflected Cherenkov light (DIRC) principle.
The following tasks are focused:

  • to develop new photon detection system.
  • to contribute to the construction and lead the commissioning of the DIRC for WASA at COSY.

Description of work and role of partners

Task 1. New photon detection devices (Participating institutions: FAU, GSI, UGlasgow, IJS, JLU)

Thorough development work signifies that major enhancements in the performance and lifetime of current photon detection devices considered for DIRC counters are necessary to exploit the full potential of this detector technology for the upcoming experiments in hadron physics. Members of this Consortium, in collaboration with an industrial partner, have identified a number of solutions to enhance the performance to the desired level. The work is divided into three stages.
Stage one of the work will be to determine what MCP and photocathode combination will provide the best overall lifetime. We plan to test four combinations of photocathode material and variations of micro-channel plate constructions to identify the most promising solutions. In parallel we will be exploring new geometries customized for the use in DIRC counters, including readout patterns. Stage one is expected to take two years to complete. This stage will be followed by one year of testing and evaluation using the Glasgow cosmic test setup and the available Cherenkov prototypes. In stage three of the work we will compare a diamond dynode PMT against the performance of the established MCP PMT. This work, partly funded by other sources, will compare lifetime, response time, jitter and gain. In year one phase three will then run alongside phase one to decide whether the square tube should use the diamond dynode or MCPs.
This task is led by the University of Glasgow. Testing will involve strong expertise from the groups and the Universities of Erlangen and Giessen as well as the Jozef Stefan Institute Ljubljana. This tasks will also involve close collaboration with an industrial partner from the U.K. (Photek). Photek is a specialist SME manufacturer of vacuum detectors and camera systems for photon and particle detection. It manufactures image intensifiers, photomultiplier tubes, streak tubes plus a range of associated electronics and camera systems. The company is expert in large area image intensifiers, ultra-fast PMTs, UV detection and advanced photon counting camera systems. Currently Photek serves the following markets: Physics (high energy, particle, nuclear), defence industries, physical chemistry, bioluminescence, space science, material and biological inspection.

Task 2. DIRC for WASA at COSY (Participating institutions: FZJ, JLU, FAU, UU)

This task concentrates on the installation of the full DIRC detector for WASA at COSY. One quarter of this detector will be built as a prototype before this activity commences. For this prototype the treatment of dispersion effects will be a core issue in the first year of the grant period. The second part will be the integration of a full DIRC detector into the existing WASA detector system and the commissioning of the detector in beam. The work will draw on previous experience gathered in DIRCs and funding from external sources.
This task is led by the Justus-Liebig University of Giessen. The group at the University of Giessen will also contribute the dispersion correction method and analysis software and expertise. FZJ will provide the local infrastructure. The group at the University of Erlangen will operate the photon detections system while the group at the University of Uppsala leads the integration into the data acquisition system.

The HadronPhysics3 project is supported by the European Union
under the 7th Framework Capacities Programme in the area of Research Infrastructures (RI).