Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Precision Mass Spectrometry and Fundamental Applications I
MS 1.4: Vortrag
Montag, 6. März 2017, 15:45–16:00, RW 2
HF switches for high-precision experiments including ultra cold ions — •Sven Junck1, Fabian Heisse2,3, Florian Köhler - Langes2, and Sven Sturm2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, D - 55099 Mainz — 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D - 69117 Heidelberg — 3GSI-Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt
A new generation of Penning trap experiments, aiming for high-precision QED tests in extremely strong fields, a new approach to determine the fine-structure constant and most precise measurements of the atomic masses of the proton as well as the neutron, are currently commissioned. The central measurement routine will be based on the phase-sensitive measurement technique PnA [1]. Tapping its full potential by working at the lowest accessible temperatures, resonators for detection and cooling need to be tuned and detuned in a fast and reliable way. Such tuning requires cryogenic switches for various capacities that feature negligible noise in either open or closed state. Because this is not the fact for commonly used semiconductor switches a new kind of switch has been designed which is based on the principle of bistable relays. The design’s status and its applicability to improve the phase-sensitive image charge detection technique will be discussed.
[1] Sturm, S., A. Wagner, B. Schabinger, and K. Blaum: ’Phase-Sensitive Cyclotron Frequency Measurements at Ultralow Energies’. Phys. Rev. Lett. (14 2011), vol. 107: p. 143003.