Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Ionenfallen und FT-IZR-MS, Moleküle, Cluster und Reaktionen

MS 9.4: Vortrag

Freitag, 12. März 2010, 11:30–11:45, F 428

Ion bunching properties at extremely high vacuum in the Cryogenic Trap for Fast ion beams (CTF) — •Michael Froese1, Klaus Blaum1, Florian Fellenberger1, Manfred Grieser1, Oded Heber2, Michael Lange1, Felix Laux1, Sebastian Menk1, Dmitry A. Orlov1, Roland Repnow1, Thomas Sieber1, Yoni Toker2, Robert von Hahn1, and Andreas Wolf11Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Weizman Institute of Science, Rehovot, 76100, Israel

The electrostatic Cryogenic Trap for Fast ion beams (CTF) employed the already demonstrated extremely high vacuum (room temperature equivalent pressure of 8 · 10−14 mbar or a residual gas density around 2000 cm−3) to investigate ion bunching properties. Since the main ion loss processes are dramatically reduced at these residual gas pressures, beam lifetimes of over 5 minutes were measured. Coherent ion bunches were observed for tens of seconds, demonstrating a dramatic increase from previous measurements using room-temperature electrostatic ion beam traps (EIBTs) with durations of around 100 ms. The observed decays demonstrate that a minimum charge density is required to sustain the bunch. Both N2+ and Al2 ion bunches stored at energies between 6.0 and 7.1 keV demonstrate qualitatively similar decays. These ion bunch decays in addition to a determination of the initial bunch shape using a laser probing technique will be presented. The implications of these bunch decays for using EIBTs as mass spectrometers will also be discussed.

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