EGAS41 - Swansea University

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41 st EGAS CP 200 Gdańsk 2009 Rydberg atoms as a source of cold electrons E.P. Smakman ∗ , G. Taban, M.P. Reijnders, N. Debernardi, O.J. Luiten, E.J.D. Vredenbregt Department of Applied Physics, Eindhoven <strong>University</strong> of Technology, P.O Box 513, 5600 MB Eindhoven, Netherlands ∗ Corresponding author: e.p.smakman@student.tue.nl We recently demonstrated a new type of pulsed electron source [1] based on ultracold plasmas (UCPs), which are formed by photo-ionization of laser cooled atoms just above the ionization threshold. Here we employ similar concepts by extracting electrons from a gas of frozen nS- and nD-Rydberg atoms. The experimental setup consists of a vapor-cell magneto-optical trap (MOT) for rubidium built inside a dedicated accelerator structure [2], followed by a detector consisting of a micro-channel plate with phosphor screen. A narrow cylinder of the atoms is irradiated by a pulsed dye laser tuned to high Rydberg states, which are then field-ionized using a fast electric field pulse. The free electrons are accelerated towards the detector, and images of the electron bunch are then used to derive the source temperature using a model of the beam transport system. For S-states with n = 26..35, an electron temperature of 9±4 K is obtained, while for D-states T=36±5 K [3]. We conclude that field ionization of Rydberg atoms is an alternative way to reach source temperatures in the 10 K regime. The Rydberg states used so far correspond to beam energies up to 1.4 keV. To reach higher energies, states with lower n can be used. The setup is currently being modified in order to control the beam also at these conditions. The aim is to determine the source temperature with 14 keV electrons using Rydberg states down to n = 15. References [1] B.J. Claessens et al., Phys. Rev. Lett. 95, 164801 (2005) [2] G. Taban et al., Phys. Rev. STAB 11, 050102, (2008) [3] G. Taban et al., Phys. Rev. Lett. (2009), submitted 260
41 st EGAS CP 201 Gdańsk 2009 Gravity measurements with cold atom interferometry F. Sorrentino 1,2,∗ , A. Alberti 1 , M. de Angelis 2 , L. Cacciapuoti 3 , G. Campo 1 , A. Giorgini 1,4 , M. Prevedelli 5 , G. Rosi 1 , G.M. Tino 1 1 Dipartimento di Fisica and LENS, Università di Firenze - INFN, via Sansone 1 Polo Scientifico, I-50019 Sesto Fiorentino (Firenze) Italy 2 Istituto di Cibernetica CNR, via Campi Flegrei 34 80078 Pozzuoli (NA) Italy 3 ESA Reasearch and Scientific Support Department, ESTEC, Keperlaan 1 - P.O. Box 299, 2200 AG Noordwijk ZH, The Netherlands 4 Also at: Dipartimento di Fisica, Università di Napoli, via Cinthia, I-80126 Napoli, Italy 5 Dipartimento di Chimica Fisica ed Inorganica - Universit di Bologna, Bologna, Italy ∗ Corresponding author: sorrentino@fi.infn.it, We will present some experiments on gravity using atom interferometry. We use a Raman ligth-pulse interferometry scheme on a rubidium atomic fountain to determine the gravitational constant G. We also working to test the Newtonian gravitational law at micrometric distances using an ultracold strontium sample trapped in an optical lattice. Other experiments in progress, planned or being considered using ultracold atom devices for applications in gravity monitoring and in space will be also discribed. 261
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41 st EGAS Gdańsk 2009 Faculty of
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Lectures
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segmented dc-electrodes rf-electrod
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Fluorescence Intensity [arb.un.] 41
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Page 275 and 276: Author Index Abdel-Aty M., 72 Adamo
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EGAS41 - Swansea University

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