title: Compact setup for the production of (87)Rb |F = 2, m = + 2〉 Bose-Einstein condensates in a hybrid trap.
abstract: We present a compact experimental apparatus for Bose-Einstein condensation of (87)Rb in the |F  =  2, mF = + 2〉 state. A pre-cooled atomic beam of (87)Rb is obtained by using an unbalanced magneto-optical trap, allowing controlled transfer of trapped atoms from the first vacuum chamber to the science chamber. Here, atoms are transferred to a hybrid trap, as produced by overlapping a magnetic quadrupole trap with a far-detuned optical trap with crossed beam configuration, where forced radiofrequency evaporation is realized. The final evaporation leading to Bose-Einstein condensation is then performed by exponentially lowering the optical trap depth. Control and stabilization systems of the optical trap beams are discussed in detail. The setup reliably produces a pure condensate in the |F = 2, mF = + 2〉 state in 50 s, which includes 33 s loading of the science magneto-optical trap and 17 s forced evaporation.
authors: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors: Raffaele
authors: R
authors: Nolli
authors: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors: Michela
authors: M
authors: Venturelli
authors: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors: Luca
authors: L
authors: Marmugi
authors: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors: Arne
authors: A
authors: Wickenbrock
authors: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors: Ferruccio
authors: F
authors: Renzoni