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The Crystal Zero Degree Detector at BESIII
Univ Giessen, Phys Inst 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany..
Johannes Gutenberg Univ Mainz, Inst Nucl Phys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany..
Johannes Gutenberg Univ Mainz, Inst Nucl Phys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany..
Johannes Gutenberg Univ Mainz, Inst Nucl Phys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany..
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2017 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, C07001Article in journal (Refereed) Published
Abstract [en]

The BESIII experiment at the BEPCII electron positron collider at IHEP (Beijing) is collecting data in the charm-tau mass region. Electron positron collisions are a very well suited environment for the study of initial state radiation (ISR). However, the photons from ISR are strongly peaked towards small polar angles and are currently detected with limited efficiency. In order to increase the detection efficiency of ISR photons, we are developing small-size calorimeters to be placed in the very forward and backward regions. Each detector will consist of two 4 x 3 arrays of 1 x 1 x 14 cm(3) LYSO crystals. A 1 cm gap separating each of the two arrays will reduce the contamination from background at very low angles. The scintillation light will be collected by silicon photomultipliers (SiPMs). The expected event rate in the MHz range requires flash ADCs recording the preamplified SiPM outputs. The digitized waveforms will be analyzed in realtime yielding data reduction and pile-up detection. This high bandwidth data stream will be transmitted via optical fibers to FPGA-based hardware performing sub-event building, buffering, and event correlation with the BESIII trigger. The sub-events with a corresponding trigger will be sent to the BESIII event builder via TCP/IP. A single crystal equipped with a SiPM was instrumented as a prototype detector. Tests with radioactive sources were performed successfully.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 12, C07001
Keyword [en]
Calorimeters, Data acquisition concepts, Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-333401DOI: 10.1088/1748-0221/12/07/C07001ISI: 000406420100001OAI: oai:DiVA.org:uu-333401DiVA: diva2:1156752
Conference
International Conference on Instrumentation for Colliding Beam Physics, FEB 27-MAR 03, 2017, Budker Inst Nucl Phys, Novosibirsk, RUSSIA
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved

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Johansson, TordMarcinievski, Pawel

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