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  • 1. Bagdasarian, Z.
    et al.
    Stephenson, E. J.
    Thörngren Engblom, Pia
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wuestner, P.
    Measuring the polarization of a rapidly precessing deuteron beam2014In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 17, no 5, p. 052803-Article in journal (Refereed)
    Abstract [en]

    This paper describes a time-marking system that enables a measurement of the in-plane (horizontal) polarization of a 0.97-GeV/c deuteron beam circulating in the Cooler Synchrotron (COSY) at the Forschungszentrum Julich. The clock time of each polarimeter event is used to unfold the 120-kHz spin precession and assign events to bins according to the direction of the horizontal polarization. After accumulation for one or more seconds, the down-up scattering asymmetry can be calculated for each direction and matched to a sinusoidal function whose magnitude is proportional to the horizontal polarization. This requires prior knowledge of the spin tune or polarization precession rate. An initial estimate is refined by resorting the events as the spin tune is adjusted across a narrow range and searching for the maximum polarization magnitude. The result is biased toward polarization values that are too large, in part because of statistical fluctuations but also because sinusoidal fits to even random data will produce sizable magnitudes when the phase is left free to vary. An analysis procedure is described that matches the time dependence of the horizontal polarization to templates based on emittance-driven polarization loss while correcting for the positive bias. This information will be used to study ways to extend the horizontal polarization lifetime by correcting spin tune spread using ring sextupole fields and thereby to support the feasibility of searching for an intrinsic electric dipole moment using polarized beams in a storage ring. This paper is a combined effort of the Storage Ring EDM collaboration and the JEDI collaboration.

  • 2. Edgecock, T. R.
    et al.
    Caretta, O.
    Davenne, T.
    Densam, C.
    Fitton, M.
    Kelliher, D.
    Loveridge, P.
    Machida, S.
    Prior, C.
    Rogers, C.
    Rooney, M.
    Thomason, J.
    Wilcox, D.
    Wildner, E.
    Efthymiopoulos, I.
    Garoby, R.
    Gilardoni, S.
    Hansen, C.
    Benedetto, E.
    Jensen, E.
    Kosmicki, A.
    Martini, M.
    Osborne, J.
    Prior, G.
    Stora, T.
    Mendonca, T. Melo
    Vlachoudis, V.
    Waaijer, C.
    Cupial, P.
    Chance, A.
    Longhin, A.
    Payet, J.
    Zito, M.
    Baussan, E.
    Bobeth, C.
    Bouquerel, E.
    Dracos, M.
    Gaudiot, G.
    Lepers, B.
    Osswald, F.
    Poussot, P.
    Vassilopoulos, N.
    Wurtz, J.
    Zeter, V.
    Bielski, J.
    Kozien, M.
    Lacny, L.
    Skoczen, B.
    Szybinski, B.
    Ustrycka, A.
    Wroblewski, A.
    Marie-Jeanne, M.
    Balint, P.
    Fourel, C.
    Giraud, J.
    Jacob, J.
    Lamy, T.
    Latrasse, L.
    Sortais, P.
    Thuillier, T.
    Mitrofanov, S.
    Loiselet, M.
    Keutgen, Th
    Delbar, Th
    Debray, F.
    Trophine, C.
    Veys, S.
    Daversin, C.
    Zorin, V.
    Izotov, I.
    Skalyga, V.
    Burt, G.
    Dexter, A. C.
    Kravchuk, V. L.
    Marchi, T.
    Cinausero, M.
    Gramegna, F.
    De Angelis, G.
    Prete, G.
    Collazuol, G.
    Laveder, M.
    Mazzocco, M.
    Mezzetto, M.
    Signorini, C.
    Vardaci, E.
    Di Nitto, A.
    Brondi, A.
    La Rana, G.
    Migliozzi, P.
    Moro, R.
    Palladino, V.
    Gelli, N.
    Berkovits, D.
    Hass, M.
    Hirsh, T. Y.
    Schaumann, M.
    Stahl, A.
    Wehner, J.
    Bross, A.
    Kopp, J.
    Neuffer, D.
    Wands, R.
    Bayes, R.
    Laing, A.
    Soler, P.
    Agarwalla, S. K.
    Cervera Villanueva, A.
    Donini, A.
    Ghosh, T.
    Gomez Cadenas, J. J.
    Hernandez, P.
    Martin-Albo, J.
    Mena, O.
    Burguet-Castell, J.
    Agostino, L.
    Buizza-Avanzini, M.
    Marafini, M.
    Patzak, T.
    Tonazzo, A.
    Duchesneau, D.
    Mosca, L.
    Bogomilov, M.
    Karadzhov, Y.
    Matev, R.
    Tsenov, R.
    Akhmedov, E.
    Blennow, M.
    Lindner, M.
    Schwetz, T.
    Fernandez Martinez, E.
    Maltoni, M.
    Menendez, J.
    Giunti, C.
    Gonzalez Garcia, M. C.
    Salvado, J.
    Coloma, P.
    Huber, P.
    Li, T.
    Pavon, J. Lopez
    Orme, C.
    Pascoli, S.
    Meloni, D.
    Tang, J.
    Winter, W.
    Ohlsson, Tommy
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
    Zhang, He
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Scotto-Lavina, L.
    Terranova, F.
    Bonesini, M.
    Tortora, L.
    Alekou, A.
    Aslaninejad, M.
    Bontoiu, C.
    Kurup, A.
    Jenner, L. J.
    Long, K.
    Pasternak, J.
    Pozimski, J.
    Back, J. J.
    Harrison, P.
    Beard, K.
    Bogacz, A.
    Berg, J. S.
    Stratakis, D.
    Witte, H.
    Snopok, P.
    Bliss, N.
    Cordwell, M.
    Moss, A.
    Pattalwar, S.
    Apollonio, M.
    High intensity neutrino oscillation facilities in Europe2013In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 16, no 2, p. 021002-Article in journal (Refereed)
    Abstract [en]

    The EUROnu project has studied three possible options for future, high intensity neutrino oscillation facilities in Europe. The first is a Super Beam, in which the neutrinos come from the decay of pions created by bombarding targets with a 4 MW proton beam from the CERN High Power Superconducting Proton Linac. The far detector for this facility is the 500 kt MEMPHYS water Cherenkov, located in the Frejus tunnel. The second facility is the Neutrino Factory, in which the neutrinos come from the decay of mu(+) and mu(-) beams in a storage ring. The far detector in this case is a 100 kt magnetized iron neutrino detector at a baseline of 2000 km. The third option is a Beta Beam, in which the neutrinos come from the decay of beta emitting isotopes, in particular He-6 and Ne-18, also stored in a ring. The far detector is also the MEMPHYS detector in the Frejus tunnel. EUROnu has undertaken conceptual designs of these facilities and studied the performance of the detectors. Based on this, it has determined the physics reach of each facility, in particular for the measurement of CP violation in the lepton sector, and estimated the cost of construction. These have demonstrated that the best facility to build is the Neutrino Factory. However, if a powerful proton driver is constructed for another purpose or if the MEMPHYS detector is built for astroparticle physics, the Super Beam also becomes very attractive.

  • 3. Weidemann, Christian
    et al.
    Thörngren Engblom, Pia
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. University of Ferrara.
    Wüstner, Peter
    Toward polarized antiprotons: Machine development for spin-filtering experiments2015In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 18, no 2, article id 020101Article in journal (Refereed)
    Abstract [en]

    The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of 49.3 MeV in COSY. The implementation of a low-β insertion made it possible to achieve beam lifetimes of τb=8000s in the presence of a dense polarized hydrogen storage-cell target of areal density dt=(5.5±0.2)×1013atoms/cm2. The developed techniques can be directly applied to antiproton machines and allow the determination of the spin-dependent p¯p cross sections via spin filtering.

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