Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster - Instrumentation I
HK 52.24: Poster
Wednesday, March 6, 2013, 16:45–19:00, HSZ 2.OG
CALIFA at R3B: LED-based gain monitoring system and gamma-ray energy reconstruction algorithm — •Han-Bum Rhee, Lucas Lutz, Timo Bloch, Alexander Ignatov, Stoyanka Ilieva, Thorsten Kröll, and Mirko von Schmid — Technische Universität Darmstadt, Darmstadt, Germany
CALIFA is a calorimeter and spectrometer that aims to detect gamma-rays and light charged particles. It is a part of the R3B experiment at the future FAIR facility. CALIFA is a highly segmented detector surrounding the target to allow measurement of the emission angle and energy of reaction products. The CALIFA barrel consists of CsI(Tl) scintillating crystals, which are individually read out with Avalanche Photodiodes. Therefore, a gain monitoring system is needed. In this work we propose to use light signals from a pulsed LED, distributed to the detector elements via optical fibres, to monitor gain variations. Another part of the work concerns the detection of gamma-rays and the reconstruction of its initial energy. Gamma-ray typically deposits its energy in several crystals and gets Lorenz-boosted while being emitted by a relativistic ion. An algorithm to reconstruct the multiplicity and the initial energy of gamma-rays using R3BRoot simulation package is investigated.
This work is supported by BMBF (06DA9040I, 05P12RDFN8) and HIC for FAIR.