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1. Phase measurement for driven spin oscillations in a storage ring

Author

N. Hempelmann, V. Hejny, J. Pretz, H. Soltner, W. Augustyniak, Z. Bagdasarian, M. Bai, L. Barion, M. Berz, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, K. Grigoryev, D. Grzonka, G. Guidoboni, D. Heberling, J. Hetzel, F. Hinder, A. Kacharava, V. Kamerdzhiev, I. Keshelashvili, I. Koop, A. Kulikov, A. Lehrach, P. Lenisa, N. Lomidze, B. Lorentz, P. Maanen, G. Macharashvili, A. Magiera, D. Mchedlishvili, S. Mey, F. Müller, A. Nass, N. N. Nikolaev, M. Nioradze, A. Pesce, D. Prasuhn, F. Rathmann, M. Rosenthal, A. Saleev, V. Schmidt, Y. Semertzidis, Y. Senichev, V. Shmakova, A. Silenko, J. Slim, A. Stahl, R. Stassen, E. Stephenson, H. Stockhorst, H. Ströher, M. Tabidze, G. Tagliente, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Uzikov, Yu. Valdau, E. Valetov, A. Vassiliev, C. Weidemann, A. Wrońska, P. Wüstner, P. Zuprański, and M. Żurek

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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.

Published
2018
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2. Connection between zero chromaticity and long in-plane polarization lifetime in a magnetic storage ring

Author

G. Guidoboni, E. J. Stephenson, A. Wrońska, Z. Bagdasarian, J. Bsaisou, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, V. Hejny, N. Hempelmann, F. Hinder, A. Kacharava, I. Keshelashvili, P. Kulessa, P. Lenisa, A. Lehrach, B. Lorentz, P. Maanen, R. Maier, D. Mchedlishvili, S. Mey, A. Nass, A. Pesce, Y. Orlov, J. Pretz, D. Prasuhn, F. Rathmann, M. Rosenthal, A. Saleev, Y. K. Semertzidis, Y. Senichev, V. Shmakova, H. Stockhorst, H. Ströher, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Valdau, C. Weidemann, P. Wüstner, M. Żurek, and D. Zyuzin

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

In this paper, we demonstrate the connection between a magnetic storage ring with additional sextupole fields set so that the x and y chromaticities vanish and the maximizing of the lifetime of in-plane polarization (IPP) for a 0.97-GeV/c deuteron beam. The IPP magnitude was measured by continuously monitoring the down-up scattering asymmetry (sensitive to sideways polarization) in an in-beam, carbon-target polarimeter and unfolding the precession of the IPP due to the magnetic anomaly of the deuteron. The optimum operating conditions for a long IPP lifetime were made by scanning the field of the storage ring sextupole magnet families while observing the rate of IPP loss during storage of the beam. The beam was bunched and electron cooled. The IPP losses appear to arise from the change of the orbit circumference, and consequently the particle speed and spin tune, due to the transverse betatron oscillations of individual particles in the beam. The effects of these changes are canceled by an appropriate sextupole field setting.

Published
2018
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3. Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Author

A. Saleev, N. N. Nikolaev, F. Rathmann, W. Augustyniak, Z. Bagdasarian, M. Bai, L. Barion, M. Berz, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, K. Grigoryev, D. Grzonka, G. Guidoboni, D. Heberling, V. Hejny, N. Hempelmann, J. Hetzel, F. Hinder, A. Kacharava, V. Kamerdzhiev, I. Keshelashvili, I. Koop, A. Kulikov, A. Lehrach, P. Lenisa, N. Lomidze, B. Lorentz, P. Maanen, G. Macharashvili, A. Magiera, D. Mchedlishvili, S. Mey, F. Müller, A. Nass, A. Pesce, D. Prasuhn, J. Pretz, M. Rosenthal, V. Schmidt, Y. Semertzidis, Y. Senichev, V. Shmakova, A. Silenko, J. Slim, H. Soltner, A. Stahl, R. Stassen, E. Stephenson, H. Stockhorst, H. Ströher, M. Tabidze, G. Tagliente, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Uzikov, Yu. Valdau, E. Valetov, A. Vassiliev, C. Weidemann, A. Wrońska, P. Wüstner, P. Zuprański, and M. Zurek

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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 μ rad.

Published
2017
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4. Phase measurement for driven spin oscillations in a storage ring

Author

S. Mey, P. Zupranski, L. Barion, M. S. Nioradze, A. Saleev, Martin Berz, D. Mchedlishvili, G. Guidoboni, E. J. Stephenson, Aleksandra Wrońska, R. Talman, Yu. N. Uzikov, H. Stockhorst, C. Weidemann, P. Wuestner, J. Slim, Dirk Heberling, D. Eversmann, P. Maanen, V. Schmidt, A. Stahl, B. Lorentz, W. Augustyniak, J. Pretz, K. Grigoryev, M. Bai, N.L. Lomidze, J. Hetzel, Alexander J. Silenko, H. Stroeher, Yu. Valdau, Nikolai N. Nikolaev, S. Dymov, D. Prasuhn, V. Hejny, Y. Semertzidis, E. Valetov, F. Mueller, Paolo Lenisa, H. Soltner, V. Shmakova, S. Chekmenev, A. Magiera, Rolf Stassen, F. Hinder, G.G. Macharashvili, G. Ciullo, G. Tagliente, A. Vassiliev, D. Grzonka, Ivan Koop, M. Gaisser, A.K. Kacharava, N. Hempelmann, Andreas Lehrach, A. Kulikov, I. Keshelashvili, M. D. Tabidze, Martin Rosenthal, Maria Zurek, F. Trinkel, Pia Thörngren Engblom, V. Kamerdzhiev, Y. Senichev, A. Nass, Frank Rathmann, Z. Bagdasarian, A. Pesce, Ralf Gebel, and Publica

Subjects
Physics, Physics and Astronomy (miscellaneous), Nuclear and High Energy Physics, Surfaces and Interfaces, Accelerator Physics (physics.acc-ph), 010308 nuclear & particles physics, Socio-culturale, FOS: Physical sciences, Polarization (waves), 01 natural sciences, 13.40.Em, 11.30.Er, 29.20.D, 29.20.dg, 29.20.db, Physical Sciences, 0103 physical sciences, lcsh:QC770-798, Fysik, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Physics - Accelerator Physics, ddc:530, Radio frequency, Atomic physics, 010306 general physics, Storage ring
Abstract

Physical review accelerators and beams 21(4), 042002 (2018). doi:10.1103/PhysRevAccelBeams.21.042002, Published by American Physical Society, College Park, MD

Published
2018
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5. Phase Locking the Spin Precession in a Storage Ring

Author

Z. Bagdasarian, A. Pesce, Martin Berz, M. Bai, D. Mchedlishvili, D. Prasuhn, Ralf Gebel, E. Valetov, Dirk Heberling, Frank Rathmann, D. Grzonka, E. J. Stephenson, M. Żurek, P. Zupranski, H. Stockhorst, V. Shmakova, Andreas Lehrach, M. D. Tabidze, L. Barion, Aleksandra Wrońska, A. Stahl, B. Lorentz, J. Hetzel, Ivan Koop, D. Eversmann, G.G. Macharashvili, A. Saleev, P. Maanen, M. Gaisser, V. Kamerdzhiev, A. Magiera, G. Guidoboni, F. Müller, W. Augustyniak, P. Wüstner, J. Pretz, F. J. Etzkorn, G. Ciullo, A. Nass, S. Mey, I. Keshelashvili, H. Ströher, A. Kulikov, Nikolai N. Nikolaev, S. Chekmenev, S. Dymov, R. Stassen, F. Trinkel, C. Weidemann, J. Slim, V. Schmidt, Yu. Valdau, A. Silenko, N.L. Lomidze, Helmut Soltner, Y. Semertzidis, Martin Rosenthal, R. Talman, Yu. N. Uzikov, Paolo Lenisa, T. Hanraths, F. Hinder, A. Vassiliev, N. Hempelmann, K. Grigoryev, V. Hejny, G. Tagliente, A.K. Kacharava, and P. Thörngren Engblom

Subjects
Accelerator Physics (physics.acc-ph), Socio-culturale, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, Beam Polarization, Sine wave, Nuclear magnetic resonance, storage rings, 0103 physical sciences, ddc:550, Accelerators, storage rings, Beam Polarization, EDM search, 010306 general physics, Physics, Spin polarization, 010308 nuclear & particles physics, Horizontal plane, Polarization (waves), Charged particle, Electric dipole moment, EDM search, Physics::Accelerator Physics, Physics - Accelerator Physics, Radio frequency, Atomic physics, Accelerators, Storage ring
Abstract

This letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/$c$ bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate ($\approx 121$ kHz) and the phase of the horizontal polarization component. Real time synchronization with a radio frequency (rf) solenoid made possible the rotation of the polarization out of the horizontal plane, yielding a demonstration of the feedback method to manipulate the polarization. In particular, the rotation rate shows a sinusoidal function of the horizontal polarization phase (relative to the rf solenoid), which was controlled to within a one standard deviation range of $\sigma = 0.21$ rad. The minimum possible adjustment was 3.7 mHz out of a revolution frequency of 753 kHz, which changes the precession rate by 26 mrad/s. Such a capability meets a requirement for the use of storage rings to look for an intrinsic electric dipole moment of charged particles.

Published
2017

6. The connection between zero chromaticity and long in-plane polarization lifetime in a magnetic storage ring

Author

M. Gaisser, V. Shmakova, B. Lorentz, A. Nass, G. Guidoboni, S. Mey, D. Zyuzin, Frank Rathmann, R. Maier, E. J. Stephenson, A.K. Kacharava, F. Trinkel, Aleksandra Wrońska, P. Wüstner, D. Mchedlishvili, J. Bsaisou, G. Ciullo, M. Żurek, Y. Senichev, Paolo Lenisa, F. Hinder, Yuri F. Orlov, S. Dymov, Martin Rosenthal, N. Hempelmann, H. Stockhorst, P. Thörngren Engblom, D. Eversmann, P. Maanen, A. Saleev, Z. Bagdasarian, A. Pesce, Ralf Gebel, D. Prasuhn, P. Kulessa, J. Pretz, V. Hejny, H. Ströher, I. Keshelashvili, Y. Semertzidis, Andreas Lehrach, C. Weidemann, Yu. Valdau, S. Chekmenev, and R. Talman

Subjects
Physics and Astronomy (miscellaneous), Nuclear and High Energy Physics, Surfaces and Interfaces, Accelerator Physics (physics.acc-ph), Physics - Instrumentation and Detectors, Socio-culturale, FOS: Physical sciences, Ring (chemistry), 01 natural sciences, law.invention, law, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, Chromaticity, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Zero (complex analysis), Magnetic storage, Instrumentation and Detectors (physics.ins-det), Polarization (waves), Connection (mathematics), In plane, lcsh:QC770-798, Physics::Accelerator Physics, Physics - Accelerator Physics, Atomic physics
Abstract

In this paper, we demonstrate the connection between a magnetic storage ring with additional sextupole fields set so that the x and y chromaticities vanish and the maximizing of the lifetime of in-plane polarization (IPP) for a 0.97-GeV/c deuteron beam. The IPP magnitude was measured by continuously monitoring the down-up scattering asymmetry (sensitive to sideways polarization) in an in-beam, carbon-target polarimeter and unfolding the precession of the IPP due to the magnetic anomaly of the deuteron. The optimum operating conditions for a long IPP lifetime were made by scanning the field of the storage ring sextupole magnet families while observing the rate of IPP loss during storage of the beam. The beam was bunched and electron cooled. The IPP losses appear to arise from the change of the orbit circumference, and consequently the particle speed and spin tune, due to the transverse betatron oscillations of individual particles in the beam. The effects of these changes are canceled by an appropriate sextupole field setting., Comment: 18 pages, 18 figures, prepared for Phys. Rev. Accel. Beams

Published
2017
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7. Electromagnetic Simulation and Design of a Novel Waveguide RF Wien Filter for Electric Dipole Moment Measurements of Protons and Deuterons

Author

F. Trinkel, Dirk Heberling, Ralf Gebel, J. Slim, Andreas Lehrach, D. Hölscher, Jörg Wolters, Frank Rathmann, Helmut Soltner, S. Mey, L. Reifferscheidt, A. Nass, F. Hinder, B. Lorentz, H. Straatmann, and Publica

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Proton, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, law.invention, Nuclear physics, law, Electric field, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Wien filter, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Synchrotron, Charged particle, Computational physics, Dipole, Electric dipole moment, Waveguide
Abstract

The conventional Wien filter is a device with orthogonal static magnetic and electric fields, often used for velocity separation of charged particles. Here we describe the electromagnetic design calculations for a novel waveguide RF Wien filter that will be employed to solely manipulate the spins of protons or deuterons at frequencies of about 0.1 to 2 MHz at the COoler SYnchrotron COSY at J\"ulich. The device will be used in a future experiment that aims at measuring the proton and deuteron electric dipole moments, which are expected to be very small. Their determination, however, would have a huge impact on our understanding of the universe., Comment: 10 pages, 10 figures, 4 tables

Published
2016

8. New method for a continuous determination of the spin tune in storage rings and implications for precision experiments

Author

V. Hejny, H. Glückler, S. Chekmenev, Susanna Bertelli, Martin Berz, D. Mchedlishvili, Serge Andrianov, B. Lorentz, K. Grigoryev, Y. Semertzidis, G. Natour, B. Mariański, G.G. Macharashvili, K. Nowakowski, M. Zakrzewska, M. Contalbrigo, I. Keshelashvili, Paolo Lenisa, R. Talman, Frank Rathmann, E. Valetov, M. S. Nioradze, M. Statera, S. Dymov, A. Trzciński, D. Chiladze, Hans-Joachim Krause, J. Ritman, Andreas Lehrach, A. Saleev, Nikolai N. Nikolaev, H. Stockhorst, D. Hölscher, F. Hinder, V. Shmakova, S. Mey, C. Hanhart, C. Weidemann, J. Slim, A. Vassiliev, Ivan Koop, A. Khoukaz, Frank Goldenbaum, P. Zupranski, M. Bai, D. Eversmann, P. Maanen, M. D. Tabidze, M. Gaisser, N. Hempelmann, N.L. Lomidze, Alexander J. Silenko, A. Magiera, H. Straatmann, Dirk Heberling, R. Engels, D. Prasuhn, Andreas Nogga, W. Augustyniak, Z. Bagdasarian, J. Pretz, J. de Vries, A. Pesce, S. Krewald, D. Zyuzin, F. Trinkel, Ralf Gebel, A. Nass, Andrew Ivanov, G. Guidoboni, V. Kamerdzhiev, Kyoko Makino, Zbigniew Rudy, Colin Wilkin, Yu. Valdau, Ulf-G. Meißner, B. Kamys, P. Wüstner, Y. Senichev, Y. u. Uzikov, F.M. Esser, Andreas Wirzba, E. J. Stephenson, Aleksandra Wrońska, Olaf Felden, A.K. Kacharava, Rolf Stassen, G. Ciullo, P. Thörngren Engblom, R. Hipple, Rudolf Maier, J. Bsaisou, J. Hetzel, Achim Stahl, H. Soltner, H. Ströher, A. I. Kulikov, Werner Bernreuther, D. Grzonka, and Martin Rosenthal

Subjects
Accelerator Physics (physics.acc-ph), time reversal, Cyclotron, FOS: Physical sciences, General Physics and Astronomy, Socio-culturale, Electron, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Economica, law, 0103 physical sciences, ddc:550, Nuclear Experiment (nucl-ex), 010306 general physics, and other discrete symmetries, 11.30.Er Charge conjugation, Nuclear Experiment, Spin-½, Accelerator physics, Physics, Spin polarization, 010308 nuclear & particles physics, Charged particle, Dipole, parity, 29.20.dg Cyclotrons, 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries,13.40.Em Electric and magnetic moments, 13.40.Em Electric and magnetic moments, Physics - Accelerator Physics, Atomic physics, 29.20.dg Cyclotrons, Storage ring
Abstract

A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune - defined as the number of spin precessions per turn - is given by $\nu_s = \gamma G$ (gamma is the Lorentz factor, $G$ the magnetic anomaly). For 970 MeV/c deuterons coherently precessing with a frequency of ~120 kHz in the Cooler Synchrotron COSY, the spin tune is deduced from the up-down asymmetry of deuteron carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order $10^{-8}$, and to $1 \cdot 10^{-10}$ for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics: controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring., Comment: 6 pages, 6 figures

Published
2015

9. Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170–380 MeV

Author

Martin Rosenthal, M. D. Tabidze, Helmut Soltner, G.G. Macharashvili, R. Talman, Izabela Ciepał, Y. Senichev, Yu. N. Uzikov, Z. Bagdasarian, A. Pesce, P. Wüstner, M. Żurek, Rolf Stassen, D. Shergelashvili, G. Ciullo, H. Ströher, A. Stahl, Ralf Gebel, A. Kulikov, C. Weidemann, J. Slim, Ivan Koop, J. Hetzel, Paolo Lenisa, M. Gaisser, V. Schmidt, Frank Rathmann, D. Grzonka, A. Magiera, F. Hinder, S. Dymov, V. Shmakova, N.L. Lomidze, I. Keshelashvili, F. Müller, F. Trinkel, N. Hempelmann, Alexander J. Silenko, D. Eversmann, P. Maanen, Andreas Lehrach, Yu. Valdau, L. Barion, K. Grigoryev, A. Nass, V. Kamerdzhiev, Aleksandra Wrońska, B. Lorentz, J. Pretz, E. J. Stephenson, E. Valetov, Nikolai N. Nikolaev, Martin Berz, D. Mchedlishvili, V. Hejny, G. Tagliente, A.K. Kacharava, V. Rolando, D. Prasuhn, and A. Saleev

Subjects
Nuclear and High Energy Physics, Nuclear Theory, Polarimetry, FOS: Physical sciences, Socio-culturale, Storage RIngs, Electric Dipole Moment, Polarized Beams, Kinetic energy, 01 natural sciences, High Energy Physics - Experiment, law.invention, Nuclear physics, High Energy Physics - Experiment (hep-ex), PE2_1, law, 0103 physical sciences, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Absolute scale, PE2_3, Physics, Range (particle radiation), 010308 nuclear & particles physics, Scattering, Synchrotron, Electric dipole moment, Physics::Accelerator Physics, Beam (structure)
Abstract

The European physical journal / A 56(8), 211 (2020). doi:10.1140/epja/s10050-020-00215-8, Published by Springer, Berlin ; Heidelberg

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