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Wyświetlanie 1-10 z 12
Tytuł:
A new beam polarimeter at COSY to search for electric dipole moments of charged particles
Autorzy:
Pretz, J.
Demary, N.
Kulikov, A.
Stephenson, E.
Pesce, A.
Kacharava, A.
Grzonka, D.
Felden, O.
Abusaif, F.
Hahnraths, T.
Ciullo, G.
Lorentz, B.
Magiera, Andrzej
Zurek, M.
Wüstner, P.
Mchedlishvili, D.
Grigoryev, K.
Shergelashvili, D.
Nikolaev, N.N.
Metreveli, Z.
Poncza, V.
Canale, N.
Javakhishvili, O.
Nioradze, M.
Hejny, V.
Rathmann, F.
Kamerdzhiev, V.
Karanth, Swathi
Wrońska, Aleksandra
Böker, J.
Ströher, H.
Saleev, A.
Müller, F.
Soltner, H.
Uzikov, Yu.
Lomidze, N.
Senichev, Yu.
Valdau, Yu.
Gagoshidze, M.
Sefzick, T.
Lehrach, A.
Macharashvili, G.
Dymov, S.
Prasuhn, D.
Slim, J.
Tabidze, M.
Shmakova, V.
Basile, S.
Keshelashvili, I.
Aggarwal, Anjali
Lenisa, P.
Wagner, T.
Barion, L.
Nass, A.
Gebel, R.
Tagliente, G.
Opis:
A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search for electric dipole moments (EDM) of charged particles such as the proton and deuteron. Its development and first use was on the Cooler Synchrotron (COSY) at the Forschungszentrum Jülich with 0.97 GeV/c polarized deuterons, a particle and energy suitable for an EDM search. The search requires a polarimeter with high efficiency, large analyzing power, and stable operating characteristics. With typical beam momenta of about 1 GeV/c, the scattering of protons or deuterons from a carbon target into forward angles becomes a nearly optimal choice of an analyzing reaction. The polarimeter described here consists of 52 LYSO detector modules, arranged in 4 symmetric blocks (up, down, left, right) for energy determination behind plastic scintillators for particle identification via energy loss. The commissioning results of the current setup demonstrate that the polarimeter is ready to be employed in a first direct measurement for an EDM on the deuteron, which is planned at COSY.
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:
First search for axionlike particles in a storage ring using a polarized deuteron beam
Autorzy:
Chang, S. P.
Park, S.
Pretz, J.
Siddique, S.
Jeong, H.
Nikolaev, N. N.
Semertzidis, Y. K.
Pesce, A.
Bekman, I.
Kacharava, A.
Valdau, Y.
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.
Karanth, Swathi
Kamerdzhiev, V.
Ströher, H.
Beyß, M.
Böhme, C.
Hetzel, J.
Müller, F.
Breitkreutz, B.
Saleev, A.
Soltner, H.
Lomidze, N.
Andres, A.
Vitz, M.
Lehrach, A.
Dymov, S.
Prasuhn, D.
Slim, J.
von Byern, C.
Gebel, R.
Shmakova, V.
Tabidze, M.
Shurkhno, N.
Keshelashvili, I.
Aggarwal, Anjali
Lenisa, P.
Stassen, R.
Wirzba, A.
Fröhlich, N.-O.
Wagner, T.
Aksentev, A.
Barion, L.
Stephenson, E. J.
Nass, A.
Wrońska, Aleksandra
Tagliente, G.
Opis:
Based on the notion that the local dark-matter field of axions or axionlike particles (ALPs) in our Galaxy induces oscillating couplings to the spins of nucleons and nuclei (via the electric dipole moment of the latter and/or the paramagnetic axion-wind effect), we establish the feasibility of a new method to search for ALPs in storage rings. Based on previous work that allows us to maintain the in-plane polarization of a stored deuteron beam for a few hundred seconds, we perform a first proof-of-principle experiment at the Cooler Synchrotron (COSY) to scan momenta near 970MeV/c. This entails a scan of the spin-precession frequency. At resonance between the spin-precession frequency of deuterons and the ALP-induced electric dipole moment (EDM) oscillation frequency, there is an accumulation of the polarization component out of the ring plane. Since the axion frequency is unknown, the momentum of the beam and, consequently, the spin-precession frequency are ramped to search for a vertical polarization change that occurs when the resonance is crossed. At COSY, four beam bunches with different polarization directions are used to make sure that no resonance is missed because of the unknown relative phase between the polarization precession and the axion or ALP field. A frequency window of 1.5 kHz width around the spin-precession frequency of 121 kHz is scanned. We describe the experimental procedure and a test of the methodology with the help of a radio-frequency Wien filter located on the COSY ring. No ALP resonance is observed. As a consequence, an upper limit of the oscillating EDM component of the deuteron as well as its axion coupling constants are provided.
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 decoherence and off-resonance behavior of radio-frequency-driven spin rotations in storage rings
Autorzy:
Keshelashvili, I.
Kamerdzhiev, V.
Laihem, K.
Breitkreutz, B.
Dymov, S.
Kononov, A.
Canale, N.
Wüstner, P.
Rathmann, F.
Wrońska, Aleksandra
Grzonka, D.
Poncza, V.
Slim, J.
Valdau, Y.
Lomidze, N.
Stassen, S.
Aggarwal, Anjali
Gaisser, M.
Bekman, I.
Mchedlishvili, D.
Magiera, Andrzej
Shurkhno, N.
Karanth, Swathi
Müller, F.
Nikolaev, N. N.
Alberdi, B.
Ciullo, G.
Wirzba, A.
Wagner, T.
Pretz, J.
Gebel, R.
Melnikov, A.
Hetzel, J.
Stephenson, E. J.
Grigoryev, K.
Ströher, H.
Prasuhn, D.
Kacharava, A.
Lorentz, B.
Tabidze, M.
Barion, L.
Andres, A.
Fröhlich, N.-O.
Soltner, H.
Macharashvili, G.
Abusaif, F.
Böhme, C.
Lenisa, P.
Saleev, A.
Javakhishvili, O.
Siddique, S.
Żurek, M.
Vitz, M.
Shmakova, V.
Hejny, V.
Aksentev, A.
Tagliente, G.
Silenko, A.
Nass, A.
Beyß, M.
Lehrach, A.
Shergelashvili, D.
Pesce, A.
Opis:
High-frequency driven resonant spin rotators are routinely used as standard instruments in polarization experiments in particle and nuclear physics. Maintaining the continuous exact parametric spin resonance condition of the equality of the spin rotator and the spin precession frequency during operation is one of the challenges. We present a detailed analytical description of the effects of detuning the exact spin resonance on the precessing vertical and in-plane components of the polarization. An important part of the formalism presented here is the consideration of experimentally relevant spin decoherence effects. Within the developed formalism, we address the impact of feedback via pilot-bunch-based comagnetometry on continuous spin flips and on the related interpretation of charged-particle electric dipole moment searches using storage rings. We propose a spin-flip-based tomography of the longitudinal profile of polarization in a bunch, which is important for the evaluation of the polarization-dependent luminosity in collider experiments. We emphasize the potential importance of the previously unexplored phase of the horizontal polarization of the envelope as an indicator of the stability of radio-frequency-driven spin rotations in storage rings and as a testing ground for spin decoherence mechanisms.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Proof-of-principle demonstration of a pilot bunch comagnetometer in a stored beam
Autorzy:
Pretz, J.
Siddique, S.
Valdau, Y.
Pesce, A.
Bekman, I.
Kacharava, A.
Kononov, A.
Laihem, K.
Grzonka, D.
Nikolaev, N. N.
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.
Stephenson, E. J.
Beyß, M.
Saleev, A.
Böhme, C.
Hetzel, J.
Soltner, H.
Breitkreutz, B.
Müller, F.
Żurek, M.
Lomidze, N.
Silenko, A.
Melnikov, A.
Andres, A.
Vitz, M.
Lehrach, A.
Macharashvili, G.
Dymov, S.
Prasuhn, D.
Slim, J.
Tabidze, M.
Shmakova, V.
Gaisser, M.
Shurkhno, N.
Lenisa, P.
Aggarwal, Anjali
Keshelashvili, I.
Stassen, R.
Wagner, T.
Fröhlich, N.-O.
Wirzba, A.
Aksentev, A.
Barion, L.
Nass, A.
Gebel, R.
Tagliente, G.
Opis:
In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin precessions of the orbiting particles. Time-dependent variations of the magnetic fields of ring elements lead to unwanted variations of the spin-precession frequency. We report here on a solution to this problem by shielding (or masking) one of the bunches stored in the ring from the high-frequency fields of the spin rotator, so that the masked pilot bunch acts as a comagnetometer for the other signal bunch, tracking fluctuations in the ring on a time scale of about one second. While the new method was developed primarily for searches of electric dipole moments of charged particles, it may have far-reaching implications for future spin physics facilities, such as the EIC and NICA.
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
Tytuł:
Phase measurement for driven spin oscillations in a storage ring
Autorzy:
Bagdasarian, Z.
Pretz, J.
Eversmann, D.
Kulikov, A.
Stephenson, E.
Pesce, A.
Kacharava, A.
Mey, S.
Grzonka, D.
Nikolaev, N. N.
Maanen, P.
Semertzidis, Y.
Shamkova, V.
Lorentz, B.
Siltner, H.
Ciullo, G.
Magiera, Andrzej
Schmidt, V.
Hinder, F.
Valetov, E.
Mchedlishvili, D.
Grigoryev, K.
Vassiliev, A.
Talman, R.
Nioradze, M.
Weidemann, C.
Hejny, V.
Rathmann, F.
Kamerdzhiev, V.
Wrońska, Aleksandra
Stroher, H.
Berz, M.
Chekmenev, S.
Stockhorst, H.
Engblom, P. Thorngren
Guidoboni, G.
Hetzel, J.
Muller, F.
Rosenthal, M.
Saleev, A.
Trinkel, F.
Uzikov, Yu.
Wustner, P.
Żurek, M.
Lomidze, N.
Silenko, A.
Valdau, Yu.
Hempelmann, N.
Lehrach, A.
Heberling, D.
Dymov, S.
Macharashvili, G.
Slim, J.
Tabidze, M.
Gaisser, M.
Koop, I.
Zuprański, P.
Keshelashvili, I.
Lenisa, P.
Stassen, R.
Augustyniak, W.
Senichev, Y.
Bai, M.
Prashun, D.
Barion, L.
Stahl, A.
Nass, A.
Gebel, R.
Tagliente, G.
Opis:
This paper reports the first simultaneous measurement of the horizontal and vertical components of the polarization vector in a storage ring under the influence of a radio frequency (rf) solenoid. The experiments were performed at the Cooler Synchrotron COSY in Jülich using a vector polarized, bunched 0.97 GeV/c deuteron beam. Using the new spin feedback system, we set the initial phase difference between the solenoid field and the precession of the polarization vector to a predefined value. The feedback system was then switched off, allowing the phase difference to change over time, and the solenoid was switched on to rotate the polarization vector. We observed an oscillation of the vertical polarization component and the phase difference. The oscillations can be described using an analytical model. The results of this experiment also apply to other rf devices with horizontal magnetic fields, such as Wien filters. The precise manipulation of particle spins in storage rings is a prerequisite for measuring the electric dipole moment (EDM) of charged particles.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 12

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