Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 16: Cooling and Trapping V (joint session A and Q)

A 16.2: Vortrag

Donnerstag, 5. April 2001, 17:45–18:00, H104

Continuous loading of a magnetic trap — •Jörg Werner¹, Jürgen Stuhler², Piet Oliver Schmidt¹, Sven Hensler¹, Jürgen Mlynek² und Tilman Pfau¹ — ¹5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany — ²Fachbereich für Physik, Universität Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany

We have realized a scheme for continuous loading of a magnetic trap (MT) [1]. ⁵²Cr atoms are continuously captured and cooled in a magneto-optical trap (MOT). Optical pumping to a metastable state decouples atoms from the cooling light. Due to their high magnetic moment (6 µ_B), low-field seeking metastable atoms are trapped in the magnetic quadrupole field provided by the MOT. Limited by inelastic collisions between atoms in the MOT and in the MT, we load 10⁸ metastable atoms at a rate of 10⁸ atoms/s at 50-100 µK into the MT. After loading we can perform optical repumping to realize a MT of ground state chromium atoms.

[1] J. Stuhler, P. O. Schmidt, S. Hensler, J. Werner, J. Mlynek, T. Pfau, e-print archive quant-ph/0011113