Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 8: Cooling and Trapping I (joint session A and Q)
A 8.6: Vortrag
Dienstag, 3. April 2001, 17:00–17:15, H104
Efficient laser cooling of a fast stored ion beam by a one-dimensional optical molasses — •U. Eisenbarth1, B. Eike1, P. Friedmann1, M. Grieser1, R. Grimm2, U. Schramm3, D. Schwalm1, and M. Weidemüller1 — 1Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany — 2Institut für Experimentalphysik, Universität Innsbruck, Austria — 3Sektion Physik, Universität München, Germany
At the Heidelberg Test Storage Ring (TSR), 9Be+ ions at 7.3 MeV (v=4% c) are laser-cooled to extreme phase-space densities. The cooling force has to overcome strong heating mechanisms in a storage ring mainly caused by intrabeam Coulomb scattering. When the thermal energy of the beam becomes comparable to the mutual Coulomb interaction of the ions, collective effects of the ion beam and Coulomb ordering phenomena are expected. To extend the limits of ion beam cooling, we have investigated laser cooling in a one-dimensional optical molasses which provides much larger cooling rates than previous cooling schemes employing only one laser beam [1,2]. The optical molasses is realized by two counterpropagating laser beams at 300 nm (fixed-frequency Argon-ion laser) and 326 nm (tunable frequency-doubled dye laser [2]). We present recent results on the ion beam dynamics employing this new cooling scheme.
[1] Miesner et al., Phys. Rev. Lett. 77, 623 (1996); Lauer et al., Phys. Rev. Lett. 81, 2052 (1998).
[2] See Poster by P. Friedmann et al.