Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions II
A 30.6: Vortrag
Donnerstag, 15. März 2012, 12:15–12:30, V47.03
Production of Be+ crystals in a cryogenic Paul trap for the sympathetic cooling of highly charged ions — •Alexander Windberger1, Maria Schwarz1, Oscar O. Versolato1, José R. Crespo López-Urrutia1, Alexander D. Gingell2, Anders K. Hansen2, Magnus A. Sørensen2, Michael Drewsen2, Piet O. Schmidt3, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2University of Aarhus, Denmark — 3Physikalisch-Technische Bundesanstalt, Braunschweig und Leibniz Universität, Hannover, Germany
Due to the deep core potential of highly charged ions (HCIs), optically active electrons involved in forbidden transitions are strongly bound. This type of electronic configuration offers various possibilities for high precision spectroscopy with applications to metrology and fundamental quantum dynamics. An efficient way of producing and trapping HCIs is the electron beam ion trap (EBIT). However, ion temperatures in the order of MK limit spectral resolution. With a new cryogenic Paul trap (CryPTEx) HCIs can be stored and laser cooled in a 4 K environment in which the rate of collisions with residual gas is strongly reduced. HCIs in CryPTEx will be sympathetically cooled with Be+ ions. To address the 313 nm cooling transition, a cw laser system has been developed. It comprises sum frequency and second harmonic generation stages of 1050 nm and 1550 nm fiber lasers. An output power at 313 nm of up to 750 mW can be reached. Furthermore, a source is under development for providing sufficient amounts of Be+ ions without disturbing the excellent cryogenic conditions inside the trap.