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Tytuł:
Characterisation of components of a scintillation-fiber-based compton camera
Autorzy:
Stahl, A.
Hetzel, R.
Kasper, J.
Wrońska, Aleksandra
Rusiecka, Katarzyna
Lalik, Rafał
Magiera, Andrzej
Opis:
The next awaited breakthrough in proton therapy is the inclusion of the tools for online monitoring of beam range into clinical practice. Full, three-dimensional information on the deposited dose distribution can be obtained by means of prompt gamma imaging using Compton cameras. Large gamma detection efficiency and high-rate capacity can be achieved using detectors of high granularity made of a heavy scintillator. One of the possible design options is a stack of scintillating fibers. As the overall performance of such a camera depends on the position, time and energy resolution of the fibers, we investigate those properties both experimentally in measurements with a test bench as well as via Monte Carlo simulations. The obtained results point at LYSO:Ce as the best candidate for a sensitive material of a Compton camera of the discussed type.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Comparison of readout systems for high-rate silicon photomultiplier applications
Autorzy:
Ostrzołek, Gabriel
Hetzel, R.
Magiera, Andrzej
Wong, Ming Liang
Wiebusch, M.
Urbanevych, Vitalii
Lalik, Rafał
Briggl, K.
Korcyl, Grzegorz
Kołodziej, Magdalena
Wrońska, Aleksandra
Malige, A.
Rusiecka, Katarzyna
Stahl, A.
Opis:
Recent years have shown an increased use of silicon photomultipliers (SiPM) in experiments as they are of reasonable cost, have relatively low power consumption and are easily available in a variety of form factors allowing for a large number of readout channels. At the same time, experiments are generating data at increasingly high rates requiring the use of more efficient readout systems. In this work, the dead time, efficiency, dynamic range, coincidence time resolution and energy resolution of five different readout systems at various stages of maturity are evaluated to determine the best system for acquiring data from a detector in a high rate experiment. Additional functionalities of the systems are also discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A systematic study of LYSO:Ce, LuAG:Ce and GAGG:Ce scintillating fibers properties
Autorzy:
Migdał, Wojciech
Hetzel, R.
Kasper, J.
Magiera, Andrzej
Wong, Ming Liang
Kohlhase, N.
Urbanevych, Vitalii
Lalik, Rafał
Kazemi Kozani, Majid
Kołodziej, Magdalena
Wrońska, Aleksandra
Rusiecka, Katarzyna
Rafecas, M.
Stahl, A.
Opis:
Properties of different scintillating fibers were examined and compared, as a part of the design optimization of the SiFi-CC detector, currently under development for proton therapy monitoring. Three scintillating materials were considered as candidates to constitute the active part of the detector: LYSO:Ce, LuAG:Ce and GAGG:Ce. All investigated samples had an elongated, fiber-like shape and were read out on both ends using silicon photomultipliers (SiPMs). Samples of LYSO:Ce material provided by four different manufacturers were included in the survey. Additionally, different types of optical coupling media, wrapping and coating materials were investigated. The following properties of the scintillating fibers were determined: attenuation length, position-, energy-, timing resolution and light collection. Two models were used to describe the propagation of scintillating light in the fiber and quantify the light attenuation: exponential light attenuation model (ELA) and exponential light attenuation model with light reflection (ELAR). Energy and position reconstruction were also performed using the two above methods. It was shown, that the ELAR model performs better in terms of description of the light attenuation process. However, energy and position reconstruction results are comparable for the two proposed methods. Based on the results of measurements with scintillating fibers in different configurations we concluded that LYSO:Ce fibers wrapped in Al foil (bright side facing towards the fiber) provided the best trade-off between the energy- (8.56% at 511 keV) and position (32 mm) resolutions and thus will be the optimal choice for the SiFi-CC detector. Additionally, the study of different optical coupling media showed, that the silicone pads coupling ensures good stability of the system performance and parameters.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement
Autorzy:
Ehrlich, C.
Abusaif, F.
Lehrach, A.
Bekman, I.
Nikolaev, N.N.
Stahl, A.
Talman, R.
Valdau, Y.
Kamerdzhiev, V.
Grigoryev, K.
Ströher, H.
Kulikov, A.
Poncza, V.
Aggarwal, Anjali
Pretz, J.
Slim, J.
Tagliente, G.
Tabidze, M.
Nass, A.
Pesce, A.
Hetzel, J.
Shergelashvili, D.
Keshelashvili, I.
Lomidze, N.
Kacharava, A.
Andres, A.
Rathmann, F.
Retzlaff, M.
Canale, N.
Karanth, Swathi
Laihem, K.
Dymov, S.
Lenisa, P.
Dahmen, F.
Uzikov, Y.
Wagner, T.
Ciullo, G.
Hejny, V.
Mchedlishvili, D.
Ciepal, I.
Magiera, Andrzej
Shmakova, V.
Müller, F.
Schmühl, M.
Grzonka, D.
Saleev, A.
Wrońska, Aleksandra
Kononov, A.
Stephenson, E.
Gebel, R.
Opis:
The Jülich Electric Dipole moment Investigation (JEDI) collaboration aims at a direct measurement of the Electric Dipole Moment (EDM) of protons and deuterons using a storage ring. The measurement is based on a polarization measurement. In order to reach highest accuracy, one has to know the exact trajectory through the magnets, especially the quadrupoles, to avoid the influence of magnetic fields on the polarization vector. In this paper, the development of a beam-based alignment technique is described that was developed and implemented at the COoler SYnchrotron (COSY) at Forschungszentrum Jülich. Well aligned quadrupoles permit one to absolutely calibrate the Beam Position Monitors (BPMs). The method is based on the fact that a particle beam, which does not pass through the center of a quadrupole, experiences a deflection. The precision reached by the method is approximately 40μm. Some consequences for the design of a new high precision storage ring for EDM mesasurements are discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170–380 MeV
Autorzy:
Bagdasarian, Z.
Pretz, J.
Eversmann, D.
Kulikov, A.
Stephenson, E.
Pesce, A.
Kacharava, A.
Grzonka, D.
Nikolaev, N. N.
Maanen, P.
Lorentz, B.
Magiera, Andrzej
Ciullo, G.
Schmidt, V.
Hinder, F.
Valetov, E.
Wüstner, P.
Mchedlishvili, D.
Grigoryev, K.
Shergelashvili, D.
Ciepał, Izabela
Talman, R.
Weidemann, C.
Rolando, V.
Hejny, V.
Rathmann, F.
Kamerdzhiev, V.
Wrońska, Aleksandra
Berz, M.
Ströher, H.
Hetzel, J.
Saleev, A.
Müller, F.
Rosenthal, M.
Soltner, H.
Trinkel, F.
Żurek, M.
Uzikov, Yu.
Lomidze, N.
Silenko, A.
Valdau, Yu.
Hempelmann, N.
Lehrach, A.
Macharashvili, G.
Dymov, S.
Prasuhn, D.
Slim, J.
Tabidze, M.
Shmakova, V.
Gaisser, M.
Koop, I.
Keshelashvili, I.
Lenisa, P.
Stassen, R.
Senichev, Y.
Barion, L.
Stahl, A.
Nass, A.
Gebel, R.
Tagliente, G.
Opis:
A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Jülich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring
Autorzy:
Pretz, J.
Siddique, S.
Nikolaev, N. N.
Valdau, Y.
Pesce, A.
Bekman, I.
Kacharava, A.
Kononov, A.
Laihem, K.
Grzonka, D.
Abusaif, F.
Lorentz, B.
Ciullo, G.
Magiera, Andrzej
Wüstner, P.
Mchedlishvili, D.
Grigoryev, K.
Shergelashvili, D.
Alberdi, B.
Poncza, V.
Canale, N.
Javakhishvili, O.
Hejny, V.
Rathmann, F.
Kamerdzhiev, V.
Karanth, Swathi
Wrońska, Aleksandra
Ströher, H.
Beyß, M.
Böhme, C.
Hetzel, J.
Müller, F.
Breitkreutz, B.
Saleev, A.
Soltner, H.
Żurek, M.
Lomidze, N.
Shankar, R.
Silenko, A.
Melnikov, A.
Andres, A.
Vitz, M.
Lehrach, A.
Macharashvili, G.
Dymov, S.
Prasuhn, D.
Slim, J.
Piccoli, A.
Tabidze, M.
Shmakova, V.
Gaisser, M.
Shurkhno, N.
Keshelashvili, I.
Aggarwal, Anjali
Lenisa, P.
Okropiridze, D.
Stassen, R.
Wagner, T.
Fröhlich, N.-O.
Wirzba, A.
Aksentev, A.
Barion, L.
Stephenson, E. J.
Nass, A.
Gebel, R.
Tagliente, G.
Opis:
This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect to a 120 kHz spin precession in the Cooler Synchrotron (COSY) storage ring. Real-time monitoring of the spin precession and the rf Wien filter signal allows the relative phase between the two to be stabilized at an arbitrary setpoint. The feedback system compensates for deviations in the relative phase by adjusting the frequency and/or phase of the rf device as needed. With this method, a variation in the phase relative to the demanded value with a standard deviation of 𝜎Δ⁢𝜑 ≈ 0.2 rad could be achieved. The system was implemented in two runs aiming at a first direct measurement of the deuteron electric dipole moment in 2018 and 2021. In addition, the difference between a single-bunch beam affected by the spin rotator and a two-bunch system in which only one bunch is exposed to the spin rotator fields is discussed. Both methods have been used during these beam times. The ability to keep the spin precession and the rf fields synchronized is crucial for future investigations of electric dipole moments of charged particles using storage rings.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Spin tune mapping as a novel tool to probe the spin dynamics in storage rings
Autorzy:
Vassiliev, A.
Augustyniak, W.
Lehrach, A.
Soltner, H.
Schmidt, V.
Nikolaev, N. N.
Stahl, A.
Guidoboni, G.
Senichev, Y.
Talman, R.
Kamerdzhiev, V.
Lorentz, B.
Bagdasarian, Z.
Mey, S.
Wüstner, P.
Grigoryev, K.
Ströher, H.
Kulikov, A.
Trinkel, F.
Gaisser, M.
Pretz, J.
Silenko, A.
Slim, J.
Tagliente, G.
Berz, M.
Valdau, Yu.
Tabidze, M.
Heberling, D.
Nass, A.
Pesce, A.
Stassen, R.
Uzikov, Yu.
Bai, M.
Hetzel, J.
Zuprański, P.
Maanen, P.
Engblom, P. Thörngren
Keshelashvili, I.
Hinder, F.
Lomidze, N.
Kacharava, A.
Prasuhn, D.
Rathmann, F.
Macharashvili, G.
Hempelmann, N.
Dymov, S.
Lenisa, P.
Barion, L.
Ciullo, G.
Hejny, V.
Chekmenev, S.
Eversmann, D.
Mchedlishvili, D.
Koop, I.
Magiera, Andrzej
Shmakova, V.
Müller, F.
Semertzidis, Y.
Valetov, E.
Grzonka, D.
Saleev, A.
Stockhorst, H.
Weidemann, C.
Wrońska, Aleksandra
Rosenthal, M.
Stephenson, E.
Zurek, M.
Gebel, R.
Opis:
Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented accuracy. The ultimate aim is to measure the electric dipole moments with a sensitivity up to 15 orders in magnitude better than the magnetic dipole moment of the stored particles. This formidable task requires an understanding of the background to the signal of the electric dipole from rotations of the spins in the spurious magnetic fields of a storage ring. One of the observables, especially sensitive to the imperfection magnetic fields in the ring is the angular orientation of stable spin axis. Up to now, the stable spin axis has never been determined experimentally, and in addition, the JEDI collaboration for the first time succeeded to quantify the background signals that stem from false rotations of the magnetic dipole moments in the horizontal and longitudinal imperfection magnetic fields of the storage ring. To this end, we developed a new method based on the spin tune response of a machine to artificially applied longitudinal magnetic fields. This novel technique, called spin tune mapping, emerges as a very powerful tool to probe the spin dynamics in storage rings. The technique was experimentally tested in 2014 using polarized deuterons stored in the cooler synchrotron COSY, and for the first time, the angular orientation of the stable spin axis at two different locations in the ring has been determined to an unprecedented accuracy of better than 2.8 $\mu$ rad.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 16

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