The Edinburgh particle identification detector

The Particle Identification detector for the Crystal Ball at MAMI

The Edinburgh Nuclear Physics group led the development of the particle-ID (PID) detector for use with the Crystal Ball at MAMI-C and its smaller prototype employed with experiments at MAMI-B. The project involved collaborators from University of Glasgow and George Washington University in the USA. The new detector was susccessfully commissioned in 2007 and met the design specification to cleanly separate protons, charged pions and electrons from uncharged events in the Crystal Ball. The device is central to the majority of the future proposals with the Crystal Ball at MAMI and its calibration and maintanance is a responsibility of our group. We are currently carrying out GEANT4 simulations and beam tests to establish the use of the detector in identifying mesons containing strange quarks, which forms the thesis project of an Edinburgh student. A modified version of the detector and its electronics will be employed in the future to extend the capabilities of the Edinburgh Recoil Polarimeter.


The latest details on the new PID can be found in the conference talk below:

  • D Watts, Crystal Ball collaboration meeting, Basel (2006) [pdf],

Information on PID-I can be found in the conference talk below:

  • E Downie, Crystal Ball collaboration meeting, Giessen (2005) [pdf]

PID during construction
GEANT4 image of the PID detector inside the Crystal Ball
The PID being mounted in the wire chamber apparatus with nervous onlookers!
The PID detector in place in the wire chamber system of the Crystal Ball