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  • 1.
    Makonyi, Karoly
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Wölbing, Dirk
    Stockholm University, Faculty of Science, Department of Physics.
    Technical design report for the (P)over-barANDA Barrel DIRC detector2019In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 46, no 4, article id 045001Article in journal (Refereed)
    Abstract [en]

    The (P) over bar ANDA (anti-Proton ANnihiliation at DArmstadt) experiment will be one of the four flagship experiments at the new international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. (P) over bar ANDA will address fundamental questions of hadron physics and quantum chromodynamics using high-intensity cooled antiproton beams with momenta between 1.5 and 15 GeV/c and a design luminosity of up to 2 x 10(32) cm(-2) S-1. Excellent particle identification (PID) is crucial to the success of the (P) over bar ANDA physics program. Hadronic PID in the barrel region of the target spectrometer will be performed by a fast and compact Cherenkov counter using the detection of internally reflected Cherenkov light (DIRC) technology. It is designed to cover the polar angle range from 22 degrees to 140 degrees and will provide at least 3 standard deviations (s.d.) pi/K separation up to 3.5 GeV/c, matching the expected upper limit of the final state kaon momentum distribution from simulation. This documents describes the technical design and the expected performance of the (P) over bar ANDA Barrel DIRC detector. The design is based on the successful BaBar DIRC with several key improvements. The performance and system cost were optimized in detailed detector simulations and validated with full system prototypes using particle beams at GSI and CERN. The final design meets or exceeds the PID goal of clean pi/K separation with at least 3 s.d. over the entire phase space of charged kaons in the Barrel DIRC.

  • 2.
    Makonyi, Karoly
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Wölbing, Dirk
    Stockholm University, Faculty of Science, Department of Physics.
    Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR2016In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 10, article id 325Article in journal (Refereed)
    Abstract [en]

    Simulation results for future measurements of electromagnetic proton form factors at PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel (p) over barp -> e(+)e(-) is studied on the basis of two different but consistent procedures. The suppression of the main background channel, i.e. (p) over barp -> pi(+)pi(-), is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance.

  • 3.
    Makonyi, Karoly
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Wölbing, Dirk
    Stockholm University, Faculty of Science, Department of Physics. Stockholm Univ, Stockholm, Sweden.
    Feasibility study for the measurement of pi N transition distribution amplitudes at (P)over-barANDA in (P)over-barp -> J/psi pi(0)2017In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 95, no 3, article id 032003Article in journal (Refereed)
    Abstract [en]

    The exclusive charmonium production process in (P) over barp annihilation with an associated pi 0 meson (p) over barp -> J/psi pi(0) is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the J/psi -> e(+) e(-) decay channel with the AntiProton ANnihilation at DArmstadt ((P) over bar ANDA) experiment is investigated. Simulations on signal reconstruction efficiency as well as the background rejection from various sources including the (P) over barp -> pi(+)pi(-)pi(0) and (p) over barp -> J/psi pi(0)pi(0) reactions are performed with PANDAROOT, the simulation and analysis software framework of the (P) over bar ANDA experiment. It is shown that the measurement can be done at (P) over bar ANDA with significant constraining power under the assumption of an integrated luminosity attainable in four to five months of data taking at the maximum design luminosity.

  • 4.
    Makonyi, Karoly
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Wölbing, Dirk
    Stockholm University, Faculty of Science, Department of Physics.
    Study of doubly strange systems using stored antiprotons2016In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 954, p. 323-340Article in journal (Refereed)
    Abstract [en]

    Bound nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena. Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems which contain two or even more units of strangeness at the PANDA experiment at FAIR. For the first time, high resolution gamma-spectroscopy of doubly strange Lambda Lambda-hypernuclei will be performed, thus complementing measurements of ground state decays of Lambda Lambda-hypernuclei at J-PARC or possible decays of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Xi(-) -atoms will be feasible and even the production of Omega(-) -atoms will be within reach. The latter might open the door to the vertical bar S vertical bar = 3 world in strangeness nuclear physics, by the study of the hadronic Omega(-) -nucleus interaction. For the first time it will be possible to study the behavior of Xi(+) in nuclear systems under well controlled conditions.

  • 5.
    Makonyi, Karolyn
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Wölbing, Dirk
    Stockholm University, Faculty of Science, Department of Physics.
    Precision resonance energy scans with the PANDA experiment at FAIR: Sensitivity study for width and line shape measurements of the X(3872)2019In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 55, no 3, article id 42Article in journal (Refereed)
    Abstract [en]

    This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like X(3872) state discussed to be exotic, and for a larger parameter space of various assumed signal cross-sections, input widths and luminosity combinations. PANDA is the only experiment that will be able to perform precision resonance energy scans of such narrow states with quantum numbers of spin and parities that differ from JPC=1--.

  • 6.
    Preston, Markus
    Stockholm University, Faculty of Science, Department of Physics.
    Single event upsets: measurements and modelling of proton- and neutron-induced errors in a 28 nm SRAM-based FPGA2018Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Single event upsets are radiation-induced errors affecting electronic devices, which can cause corruption of processed data. The electromagnetic calorimeter of the PANDA experiment — a hadron-physics experiment currently under development — will employ Xilinx Kintex-7 field-programmable gate arrays (FPGAs) in its readout electronics. During operation of the experiment, the FPGAs will be exposed to a high flux of radiation. Single-event upsets caused by protons and neutrons in the configuration memory of the FPGA have been studied through experiments and theoretical modelling. The device was irradiated with protons and neutrons of energies up to 184 MeV, and the corresponding single event upset cross sections were determined. In order to describe the energy-dependence of the cross sections, and to predict the error rates during operation of PANDA, a Monte Carlo model of energy-deposition mechanisms in silicon has been developed. The model predictions agree well with the experimental data for both protons and neutrons. Using the developed model, the mean time between failures due to neutrons during initial operation of PANDA is estimated to be 180 ± 40 hours per FPGA.

  • 7.
    Preston, Markus
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Calén, Hans
    Johansson, Tord
    Makónyi, Karoly
    Marciniewski, Pawel
    Kavatsyuk, Myroslav
    Schakel, Peter
    Measurements and Simulations of Single-Event Upsets in a 28-nm FPGA2017In: PoS - Proceedings of Science, ISSN 1824-8039, E-ISSN 1824-8039, Vol. 313Article in journal (Refereed)
    Abstract [en]

    Single-event upsets in the configuration memory of the 28-nm Xilinx Kintex-7 FPGA, used in the PANDA electromagnetic calorimeter, have been studied. Results from neutron and proton irradiations at energies up to 184 MeV are presented and compared with previous experimental results. In order to gain information about the energy-dependence of the single-event upset cross section, a GEANT4-based Monte Carlo simulation of upset mechanisms in nanometric silicon volumes has been developed. The results from this model are shown to agree with the experimental data for both neutrons and protons. Knowledge about the energy dependence of the cross section and of the particle flux at the location of the front-end modules in PANDA enables better estimates of the mean time between failures in the electromagnetic calorimeter. At PANDA, a total neutron flux of 1·102 cm−2 s−1 at the location of the front-end modules is expected at the lowest antiproton beam momentum and a luminosity of 1·1031 cm−2 s−1, leading to a predicted Mean Time Between Failures of 47 ± 10 hours per FPGA in the electromagnetic calorimeter.

1 - 7 of 7
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