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HK: Fachverband Hadronen und Kerne

HK 84: Accelerators and Instrumentation I

HK 84.6: Vortrag

Freitag, 20. März 2009, 12:15–12:30, H-ZO 80

Commissioning of the PHOS detector at ALICE/LHC — •Øystein Djuvsland — Department of Physics and Technolgy, University of Bergen, Norway

The Photon Spectrometer (PHOS) is an homogeneous electro-magnetic calorimeter designed to detect and measure the energy of neutral particles produced in hadron (p-p and Pb-Pb) collisions at the LHC accelerator. To distinguish photons from the different processes and measure the spectra an excellent energy resolution and high statistics are required. An extensive commissioning process to calibrate and tune the performance of the detector has been undertaken to fulfil these requirements. The first PHOS module was installed ready for data taking for the start up of LHC in the fall of 2008, and for the restart a total of 3 modules will be installed and commissioned. Calibration and equalisation of the gains of the Avalanche Photo Diodes (APDs) used for detection of scintillating light is especially important to acquire the desired energy resolution. One of the possible methods to achieve this before first collisions is to take advantage of the known energy deposits of muons produced in cosmic events.

Experiences and results from the commissioning of the first PHOS module will be presented.