A novel method of hit time and hit position reconstruction in scintillator detectors is described. The method is based on comparison of detector signals with results stored in a library of ...synchronized model signals registered for a set of well-defined positions of scintillation points. The hit position is reconstructed as the one corresponding to the signal from the library which is most similar to the measurement signal. The time of the interaction is determined as a relative time between the measured signal and the most similar one in the library. A degree of similarity of measured and model signals is defined as the distance between points representing the measurement- and model-signal in the multi-dimensional measurement space. Novelty of the method lies also in the proposed way of synchronization of model signals enabling direct determination of the difference between time-of-flights (TOF) of annihilation quanta from the annihilation point to the detectors. The introduced method was validated using experimental data obtained by means of the double strip prototype of the J-PET detector and 22Na sodium isotope as a source of annihilation gamma quanta. The detector was built out from plastic scintillator strips with dimensions of 5mm×19mm×300mm, optically connected at both sides to photomultipliers, from which signals were sampled by means of the Serial Data Analyzer. Using the introduced method, the spatial and TOF resolution of about 1.3cm (σ) and 125ps (σ) were established, respectively.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
We review the current understanding of time-like virtual photon emission from QCD matter. The phenomenology of dilepton emission is discussed and basic theoretical concepts are introduced. The ...experimental findings are presented, grouped into production of lepton pairs in elementary processes, production off cold nuclear matter and emission from heavy-ion collisions. The review emphasizes the role of dilepton emission as tool for studying exotic phases of QCD matter. Open questions and a route to probe the QCD phase diagram with dileptons are outlined.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Development of Forward Tracker Malige, A; Korcyl, G; Lalik, R ...
Journal of physics. Conference series,
10/2020, Volume:
1667, Issue:
1
Journal Article
Peer reviewed
Open access
The High Acceptence DiElectron Spectrometer has experienced many years of successful operation which revealed high capability of measuring resonance production in proton-proton and pion-proton ...reactions. Since many of the production channels that are crucial for the understanding of the resonance production are highly anisotropic, that a large part of the signal would be located in the most forward and backward phase space regions, a new opportunity to an upgrade to the detector for improving the phase-space acceptance in this region has been proposed. The Forward Tracker (FT) will cover the polar angle in the detector system between 0°and 6.5°, which significantly will increase the detection acceptance. The FT is in construction with the synergy with PANDA Central Tracker, and is realized by groups from Jagellionian University, FZ Jülich and LIP Coimbra. The development of the new and faster readout electronics (DAQ) to cope with higher data rates, track reconstruction and the results from the beam time at Forschungszentrum Jülich are discussed.
Large-scale physics experiments running at high interaction rates place a high demand on the data acquisition system (DAQ) responsible for transporting the data from the detector to the storage. The ...antiProton ANihilation at DArmstadt (PANDA) at the facility for anti-proton and ion research (FAIR) is one such experiment of the future that will not use fixed hardware triggers; instead, the event selection is based on real-time feature extraction, filtering, and high-level correlations. A firmware framework for such real-time data processing has been developed and tested with hardware setup for a PANDA Forward Tracker (FT) prototype. The solution is applicable for other detector subsystems based on the so-called Trigger Readout Board (TRB) data read-out system.
In this article it is presented an FPGA based Multi-Voltage Threshold (MVT) system which allows of sampling fast signals (1–2 ns rising and falling edge) in both voltage and time domain. It is ...possible to achieve a precision of time measurement of 20 ps RMS and reconstruct charge of signals, using a simple approach, with deviation from real value smaller than 10%. Utilization of the differential inputs of an FPGA chip as comparators together with an implementation of a TDC inside an FPGA allowed us to achieve a compact multi-channel system characterized by low power consumption and low production costs. This paper describes realization and functioning of the system comprising 192-channel TDC board and a four mezzanine cards which split incoming signals and discriminate them. The boards have been used to validate a newly developed Time-of-Flight Positron Emission Tomography system based on plastic scintillators. The achieved full system time resolution of σ(TOF) ≈68 ps is by factor of two better with respect to the current TOF-PET systems.
HADES is a high acceptance di-electron spectrometer operating at SIS18, GSI, Germany aimed at study of hadron-proton, hadron-nucleus and nucleus-nucleus collisions at 1-4 AGeV beam energies. The new ...electromagnetic calorimeter (ECal) was added to the experimental setup in order to measure γ-quanta and thus extend its capabilities in study of π0-, η-mesons, production of neutral hyperons and to improve electron-to-hadron separation for the partcles with momenta p > 300 MeV/c. The first data taking with the ECal detector was carried out in March 2019 when Ag+Ag collisions at 1.23 AGeV and 1.58 AGeV beam energies were studied. The methods of reconstruction of the γγ invariant mass spectra from these data are discussed. The analysis includes several steps: calibration of each module of the ECal detector, identification of γ-quanta, reconstruction of γγ invariant mass spectra and subtraction of combinatorial background. The obtained results show experimental capabilities of the new detector and, after efficiency corrections, will allow to normalize yields of other particles.
A complete, general solution for collecting and processing data from gaseous tracking detectors in high-rate applications has been developed. The readout chain consists of front-end modules equipped ...with PASTTREC ASIC chips and trigger readout boards version 3 (TRBv3) as a readout platform. The platform is accompanied by dedicated control, monitoring, and data quality assessment software. The entire system has been evaluated with a tracking system based on straw detectors in laboratory and in-beam experiments. In this paper, we present key elements of the system as well as results of various tests. The measured PASTTREC operation characteristics and the TRBv3 specification used for the readout allow us to adapt and to integrate it to the existing HADES spectrometer and the PANDA detector, an experiment under construction, both located at the FAIR facility in Darmstadt.
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