Dresden 2011 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Poster

MS 3.17: Poster

Montag, 14. März 2011, 16:00–18:00, P1

Detection electronics at the Penning trap mass spectrometer PENTATRAP — •Andreas Dörr^1,2, Christine Böhm^1,2, José Crespo López-Urrutia², Sergey Eliseev², Mikhail Goncharov², Yuri Novikov⁴, Julia Repp^1,2, Christian Roux^1,2, Sven Sturm³, Stefan Ulmer^1,3, and Klaus Blaum^1,2 — ¹Physikalisches Institut, Ruprecht-Karls-Universität, 69120 Heidelberg, Germany — ²Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ³Johannes Gutenberg-Universität, Institut für Physik, 55099 Mainz, Germany — ⁴St. Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia

The "five Penning trap" mass spectrometer PENTATRAP is currently under construction at the Max-Planck-Institut für Kernphysik in Heidelberg. Measurements of masses of single stable and long lived highly charged ions with a relative uncertainty on the order of 10⁻¹¹ are aimed at. The experiment is based on the non-destructive detection of image currents the ion induces in the trap electrodes. Essential part of each detection circuit is an inductance, configured either as a copper wire coil or as a superconducting toroid, in both cases mounted in a copper housing. Since signals are small (∼fA), low-noise detection electronics is needed to obtain a sufficient signal-to-noise ratio. Therefore the first amplification stage is a cryogenic GaAs amplifier. Currently, we evaluate the possible use of a SQUID based amplifier. Furthermore, an axial frequency down converter providing a high level of sideband rejection has been set up. Further details on the detection electronics mentioned above will be presented in the poster.