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Response of the PANDA electromagnetic calorimeter to photons with energies below 100 MeV
Stockholm University, Faculty of Science, Department of Physics. (Nuclear Physics)
2011 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

Characteristics of the electromagnetic calorimeter of PANDA (anti-Proton ANnihilations at DArmstadt), one of the key experiments at FAIR, have been measured at the tagged photon beam facility at MAX-lab for 61 energies in the range 12-63 MeV. The tested detector array consisted of 5x5 PbWO4 (lead tungstate) crystals designed for the forward end-cap. The array was cooled to -25 ºC and read out with conventional photomultiplier tubes. The measured energy resolution, σ/E, (for example 6 % at 20 MeV) shows that the current design meets the criterion of PANDA. The array is now ready to be equipped with vacuum phototriods designed for the forward end-cap.      


As a part of the experiment, characteristics of the tagging spectrometer at MAX-lab were measured. This revealed a lowered performance in terms of resolution for low energies. A discrepancy between the nominal and the measured tagged energies was also discovered. Possible explanations to these observations are presented.

Place, publisher, year, edition, pages
Stockholm University , 2011.
Keyword [en]
PANDA elecromagnetic calorimeter response PWO
National Category
Subatomic Physics
Research subject
Nuclear Physics
URN: urn:nbn:se:su:diva-59190OAI: diva2:425449
2011-05-30, 14:00 (English)
Available from: 2011-06-29 Created: 2011-06-21 Last updated: 2011-06-29Bibliographically approved

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Marcks von Würtemberg, Klas
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