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    Wyświetlanie 1-4 z 4
    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:
    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:
    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
      Wyświetlanie 1-4 z 4

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