How to Reach a Thousand-Second in-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring.

G Guidoboni, E Stephenson, S Andrianov, W Augustyniak, Z Bagdasarian, M Bai, M Baylac, W Bernreuther, S Bertelli, M Berz, J Böker, C Böhme, J Bsaisou, S Chekmenev, D Chiladze, G Ciullo, M Contalbrigo, J-M de Conto, S Dymov, R Engels, F M Esser, D Eversmann, O Felden, M Gaisser, R Gebel, H Glückler, F Goldenbaum, K Grigoryev, D Grzonka, T Hahnraths, D Heberling, V Hejny, N Hempelmann, J Hetzel, F Hinder, R Hipple, D Hölscher, A Ivanov, A Kacharava, V Kamerdzhiev, B Kamys, I Keshelashvili, A Khoukaz, I Koop, H-J Krause, S Krewald, A Kulikov, A Lehrach, P Lenisa, N Lomidze, B Lorentz, P Maanen, G Macharashvili, A Magiera, R Maier, K Makino, B Mariański, D Mchedlishvili, Ulf-G Meißner, S Mey, W Morse, F Müller, A Nass, G Natour, N Nikolaev, M Nioradze, K Nowakowski, Y Orlov, A Pesce, D Prasuhn, J Pretz, F Rathmann, J Ritman, M Rosenthal, Z Rudy, A Saleev, T Sefzick, Y Semertzidis, Y Senichev, V Shmakova, A Silenko, M Simon, J Slim, H Soltner, A Stahl, R Stassen, M Statera, H Stockhorst, H Straatmann, H Ströher, M Tabidze, R Talman, P Thörngren Engblom, F Trinkel, A Trzciński, Yu Uzikov, Yu Valdau, E Valetov, A Vassiliev, C Weidemann, C Wilkin, A Wrońska, P Wüstner, M Zakrzewska, P Zuprański, D Zyuzin

Physical Review Letters 2016 July 30

We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and the suppression of collective effects through beam current limits. This record lifetime is required for a storage ring search for an intrinsic electric dipole moment on the deuteron at a statistical sensitivity level approaching 10^{-29} e cm.

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