TY - CONF AU - Aksentyev, A.E. AU - Senichev, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Simulation of the Guide Field Flipping Procedure for the Frequency Domain Method J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The spin vector of a particle injected into a perfectly aligned storage ring precesses about the vertically-orientated guide field. In the presence of an Electric Dipole Moment (EDM), the spin precession axis acquires a proportional radial component. However, in an imperfect ring, rotational magnet misalignments induce a radial component to the spin precession axis, related to the Magnetic Dipole Moment (MDM). In the Frequency Domain Method, [*] this additional precession is dealt with by consecutively injecting the beam in opposite directions, and constructing the EDM estimator as the sum of the clockwise and counter-clockwise vertical plane precession frequencies. Since the radial MDM component changes sign when the magnetic field direction is reversed, it cancels in the sum, leaving only the EDM effect. In order to reproduce the guide field magnitude with precision sufficient for the cancellation of the MDM effect, we propose to calibrate the guide field via the horizontal plane precession frequency. In the present work we describe the algorithm of the field flipping procedure, and do a numerical simulation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 858 EP - 860 KW - GUI KW - lattice KW - simulation KW - sextupole KW - dipole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS010 UR - http://jacow.org/ipac2019/papers/mopts010.pdf ER - TY - CONF AU - Aksentyev, A.E. AU - Senichev, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Spin Motion Perturbation Effect on the EDM Statistic in the Frequency Domain Method J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The spin precession axis of a particle involved in betatron motion precesses about the invariant spin axis defined on the closed orbit (CO). This precession can be observed in polarization data as a rapid, small-amplitude oscillation on top of the major effect oscillation caused by the precession of spin about the CO axis. The frequency of this latter oscillation is used in the Frequency Domain (FD) methodology as the EDM observable. [*] It is estimated by fitting polarimetry data by a sine function; the rapid oscillations, therefore, constitute a model specification error. This model error might introduce a bias into the frequency estimate. In the present work we investigate the effect of the spin precession axis motion on measurement data and fit quality, and conclude that it is not only insignificant (with regard to data perturbation) compared to spin tune variation, but is also controllable via the application of a Spin Wheel. PB - JACoW Publishing CP - Geneva, Switzerland SP - 861 EP - 863 KW - betatron KW - polarization KW - dipole KW - storage-ring KW - lattice DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS011 UR - http://jacow.org/ipac2019/papers/mopts011.pdf ER - TY - CONF AU - Aksentyev, A.E. AU - Senichev, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Spin Decoherence in the Frozen Spin Storage Ring Method of Search for a Particle EDM J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Spin coherence refers to a measure of preservation of polarization in an initially polarized beam. The spin vector of a particle injected into a storage ring starts to precess about the vertical magnetic field vector in accordance with the Thomas-BMT equation. The precession frequency is dependent on the equilibrium-level energy, which differs across the beam particles. This does not pose a problem when the initial polarization is vertical; however, the Frozen Spin Storage Ring EDM search method [*] requires beam polarization along the momentum vector, i.e., in the horizontal plane. In the present work we analyze the source of decoherence, and investigate the way it can be suppressed in the horizontal plane in a perfectly aligned ring by means of sextupole fields. We also consider the case of an imperfect ring: transference of decoherence into the vertical plane induced by vertical plane spin precession, and the effect of sextupole fields. PB - JACoW Publishing CP - Geneva, Switzerland SP - 864 EP - 866 KW - sextupole KW - storage-ring KW - lattice KW - simulation KW - betatron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS012 UR - http://jacow.org/ipac2019/papers/mopts012.pdf ER - TY - CONF AU - Lal, S. AU - Chen, Y. AU - Paramonov, V.V. AU - Qian, H.J. AU - Shaker, H. AU - Shu, G. AU - Stephan, F. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - RF Design Studies of a 1.3 GHz Normal Conducting CW Buncher for European X-FEL J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A CW upgrade of European XFEL is under consideration, and CW electron injector is under R&D at DESY. One of the injector solutions is the LCLS-II like injector based on a normal conducting CW gun and buncher. RF design of a 1.3 GHz normal conducting buncher structure with accelerating voltage of ~ 400 kV, for such a CW injector is carried out at DESY Zeuthen site. The buncher structures with different geometrical shapes and numbers of cells are studied. The designs are optimized to have higher shunt impedance, higher mode separation and lower thermal power density for CW operation. Multipacting analysis and beam dynamics simulations are also presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3109 EP - 3111 KW - multipactoring KW - simulation KW - impedance KW - coupling KW - cavity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS012 UR - http://jacow.org/ipac2019/papers/wepts012.pdf ER - TY - CONF AU - Syresin, E. AU - Agapov, N.N. AU - Alfeev, A.V. AU - Andreev, V. AU - Baldin, A.A. AU - Bazanov, A.M. AU - Belov, A. AU - Brovko, O.I. AU - Bugaev, V.V. AU - Butenko, A.V. AU - Donets, D.E. AU - Donets, E.D. AU - Donets, E.E. AU - Eliseev, A.V. AU - Fimushkin, V.V. AU - Golovenskiy, B.V. AU - Gorbachev, E.V. AU - Govorov, A. AU - Ivanov, E.V. AU - Karpinsky, V. AU - Kekelidze, V. AU - Khodzhibagiyan, H.G. AU - Kirichenko, A. AU - Kobets, V.V. AU - Kostromin, S.A. AU - Kovalenko, A.D. AU - Kozlov, O.S. AU - Levterov, K.A. AU - Lyuosev, D.A. AU - Martynov, A.A. AU - Meshkov, I.N. AU - Mikhailov, V.A. AU - Monchinsky, V.A. AU - Nesterov, A. AU - Osipenkov, A.L. AU - Philippov, A.V. AU - Ponkin, D.O. AU - Romanov, S. AU - Rukojatkin, P.A. AU - Shevchenko, K.V. AU - Shirikov, I.V. AU - Shurygin, A.A. AU - Sidorin, A.O. AU - Slepnev, V. AU - Smirnov, A.V. AU - Trubnikov, G.V. AU - Tuzikov, A. AU - Vasilishin, B. AU - Volkov, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - NUCLOTRON Development for NICA Acceleration Complex J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Nuclotron is the basic facility of JINR used to generate beams of protons, polarized deuterons and protons, and multi charged ions in the energy range of up to 5.6 GeV/n. Polarized deuteron and proton beams were obtained at the intensity of 2×10⁹ ppp and 108 ppp, respectively. The injection with RF adiabatic capture was used in two last Nuclotron runs where C⁶⁺, Xe⁴²⁺, Kr²⁶⁺ and Ar¹⁶⁺ ion beams were accelerated. The resonant stochastic extraction (RF knockout technique) was realized. The complex is now used for fixed target experiments with extracted beams and experiments with an internal target. In the near future, the Nuclotron will be the main synchrotron of the NICA collider facility being constructed at JINR. The installation in the Nuclotron of beam injection system from the Booster and of the fast extraction system in the Collider are required for its operation in the NICA complex. In the frame of the Nuclotron injection chain upgrade, a new light ion linac (LILac) for protons and ions will be built. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3396 EP - 3398 KW - acceleration KW - proton KW - extraction KW - injection KW - target DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THXXPLM1 UR - http://jacow.org/ipac2019/papers/thxxplm1.pdf ER -