학술논문
First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit
Document Type
Working Paper
Author
Slim, J.; Nikolaev, N. N.; Rathmann, F.; Wirzba, A.; Nass, A.; Hejny, V.; Pretz, J.; Soltner, H.; Abusaif, F.; Aggarwal, A.; Aksentev, A.; Andres, A.; Barion, L.; Ciullo, G.; Dymov, S.; Gebel, R.; Gaisser, M.; Grigoryev, K.; Grzonka, D.; Javakhishvili, O.; Kacharava, A.; Kamerdzhiev, V.; Karanth, S.; Keshelashvili, I.; Lehrach, A.; Lenisa, P.; Lomidze, N.; Lorentz, B.; Magiera, A.; Mchedlishvili, D.; Müller, F.; Pesce, A.; Poncza, V.; Prasuhn, D.; Saleev, A.; Shmakova, V.; Ströher, H.; Tabidze, M.; Tagliente, G.; Valdau, Y.; Wagner, T.; Weidemann, C.; Wrońska, A.; Żurek, M.
Source
Subject
Language
Abstract
We investigated coherent betatron oscillations of a deuteron beam in the storage ring COSY, excited by a detuned radio-frequency Wien filter. The beam oscillations were detected by conventional beam position monitors. With the currently available apparatus, we show that oscillation amplitudes down to \SI{1}{\micro \meter} can be detected. The interpretation of the response of the stored beam to the detuned radio-frequency Wien filter is based on simulations of the beam evolution in the lattice of the ring and realistic time-dependent 3D field maps of the Wien filter. Future measurements of the electric dipole moment of protons will, however, require control of the relative position of counter-propagating beams in the sub-picometer range. Since here the stored beam can be considered as a rarefied gas of uncorrelated particles, we moreover demonstrate that the amplitudes of the zero-point (ground state) betatron oscillations of individual particles are only a factor of about 10 larger than the Heisenberg uncertainty limit. As a consequence of this, we conclude that quantum mechanics does not preclude the control of the beam centroids to sub-picometer accuracy. The smallest Lorentz force exerted on a single particle that we have been able to determine is \SI{10}{aN}.
Comment: 20 pages, 16 figures
Comment: 20 pages, 16 figures