DELPHI was one of four large detectors on the Large Electron-Positron collider (LEP). It took 7 years to design and build, and it started up in 1989. In December 2000, DELPHI stopped taking data and was dismantled to leave room for the construction of the Large Hadron Collider in the LEP tunnel.

DELPHI consisted of a central cylinder filled with subdetectors, with two end-caps. It was 10 meters in length and diameter, and weighed 3500 tons. The detector consisted of 20 subdetectors. A large superconducting magnet sat between an electromagnetic calorimeter (for tracking electrons) and a hadronic calorimeter (to detect hadrons). The magnet generated a field to deflect charged particles so their charge and momenta could be measured.

The collaboration running the detector consisted of about 550 physicists from 56 participating universities and institutes in 22 countries.

Computing Environment

DELPHI binaries are distributed via CVMFS via /cvmfs/ Several Linux distributions are supported. The binaries can be used directly from CVMFS, for example from, or via a virtual machine. The environment can also be run directly from any desktop which is both /cvmfs/ and /eos/experiment/delphi (or /eos/opendata/delphi) mounted, sourcing the environment from /cvmfs/ or /cvmfs/ (and pointing the environment variable DELPHI_DATA_ROOT to /eos/opendata/delphi if needed).

A quickstart guide and examples are available in

Please check the experiment home page for additional information,