Galatyuk, T.

Kardan, B.

Korcyl, G.

König, W.

Linev, S.

Neiser, A.

Ott, P.

Otte, P.

Petukhov, O.

Pietraszko, J.

Ramos, P.

Rost, A.

Svoboda, O.

Thomas, A.

Tlusty, P.

Traxler, M.

GSI Repository

Test of the HADES Electromagnetic Calorimeter modules on photon beam∗O. Svoboda†1, T. Galatyuk2, B. Kardan3, G. Korcyl4, W. Ko¨nig5, A. Neiser6, S. Linev5, P. Ott6, P.Otte6, O. Petukhov7, J. Pietraszko5, P. Ramos1, A. Rost2, A. Thomas6, P. Tlusty´1, and M. Traxler51Nuclear Physics Institute of ASCR, Rez; 2TU Darmstadt, Darmstadt; 3Goethe-Universita¨t, Frankfurt; 4SmoluchowskiInstitute of Physics, Jagiellonian University of Krako´w, Poland; 5GSI, Darmstadt; 6Institut fu¨r Kernphysik, JohannesGutenberg-Universita¨t Mainz, Germany; 7Institute for Nuclear Research, Moscow, RussiaDevelopment of the electromagnetic calorimeter(ECAL) for the HADES experiment is coming to itsfinal stage. A dedicated measurement using secondarygamma beam from MAMI facility at Johannes GutenbergUniversita¨t Mainz was employed to verify the selectedtechnical solutions.The ECAL will allow the HADES experiment to mea-sure data on neutral meson production in heavy ion colli-sions in the energy range of 2-10 AGeV with the beam ofthe future accelerator SIS100@FAIR. The detector is a leadglass calorimeter read out by photomultipliers connected toa novel electronic. A detailed description of the ECAL canbe found in [1, 2].Beam tests of single ECAL modules were performedto measure energy resolution, test the two new front-endboards (“Cracow” and PaDiWa AMPS) and measure detec-tor response on beam inclined with respect to the moduleaxis.The tagger detector from MAMI was used to select eightdifferent gamma energies ranging from 81 up to 1399 MeV(eight different triggers were used). Modules were exposedto collimated gamma beam of approx. 6 mm diameter at a5 kHz load. The CAEN DT5742 and GSI made MA8000shaper was used as a referential read out system to be ableto compare with the two tested front-end boards. Storedpulse shapes were compared with the pulses measured us-ing cosmic muons and LED monitoring system, see figure1. Results measured with PaDiWa AMPS front-end boardcan be found in [3].Energy resolution was studied to be able to decide whichsize of photomultiplier is the most suitable in terms of interms of the price-performance ratio. Resolution of mod-ules with a photomultiplier with 1” diameter seems to besignificantly worse than that one with 1.5” and 3” diameter,see figure 2. These measurements are in a good agreementwith the measurements done with the two new front-endboards.Measurements with inclined modules confirmed the re-sults of our simulations, namely that we are able with agood precission to detect particles hitting more than onemodule or placed close to module border.∗Work supported by GSI, HIC for FAIR, EMMI and Czech MSMTLG 120007, GACR 13-067595 and AS CR M100481202 grants† svoboda@ujf.cas.czFigure 1: Pulse shapes induced by photons with energy of1399 MeV, cosmic muons passing the full module lengthand by light from a LED diode.Figure 2: Energy resolution of ECAL modules with dif-ferent PMTs. Numbers behind the PMT type show energyresolution at 1 GeV.AcknowledgementsAuthors are grateful to the staff of the MAMI facility inMainz for providing excellent beam conditions.References[1] A. Kugler et al., “Electromagnetic calorimeter for HADESexperiment”, Proceedings of the 14th ICATPP Conference,vol. 8 (2013)[2] P. Tlusty et al., “Development of the HADES Electromag-netic Calorimeter”, GSI Scientific Report 2012 (2013) 37[3] M. Traxler et al., “A Precise Multi-Channel QDC FEE uti-lizing FPGAs as Discriminators and Delay Elements Basedon the TRB3 as TDC and Readout Platform”, GSI ScientificReport 2013NQM-HADES-12 GSI SCIENTIFIC REPORT 201312 doi:10.15120/GR-2014-1-NQM-HADES-12

Test of the HADES Electromagnetic Calorimeter modules on photon beam

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Test of the HADES Electromagnetic Calorimeter modules on photon beam

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