Evaluating vacuum phototriodes designed for the PANDA electromagnetic calorimeter
2014 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 763, 36-43 p.Article in journal (Refereed) Published
In this work properties of a vacuum phototriode (VPT) and preamplifier unit designed for the electromagnetic calorimeter of the PANDA experiment being built at FAIR are investigated. With the use of lead tungstate and lanthanium bromide scintillators the VPT properties are studied at low photon energies, from tens of key in the lanthanium bromide measurements and between 10 MeV and 60 MeV in the lead tungstate measurements. At these energies the noise of the VPT unit can be expected to influence its performance significantly. It is shown that the noise contribution to the measured energy resolution, under optimal conditions, is consistent with a fluctuation of (one standard deviation) approximately 200 electrons at the VPT anode. For a lead tungstate crystal this is equivalent to a noise of 1.2 MeV. For lanthanium bromide this makes it possible to use VPTs for gamma ray spectroscopy above a few hundreds of keV without noticeable effects on the energy resolution compared to measurements with a standard photomultiplier. (C) 2014 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
2014. Vol. 763, 36-43 p.
Vacuum phototriodes, Lead tungstate, Electromagnetic calorimeter, PANDA, Tagged photons, Lanthanium bromide
IdentifiersURN: urn:nbn:se:uu:diva-235610DOI: 10.1016/j.nima.2014.05.083ISI: 000341986200006OAI: oai:DiVA.org:uu-235610DiVA: diva2:762701