Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Precision Mass Spectrometry and Fundamental Applications II
MS 5.7: Vortrag
Dienstag, 13. März 2012, 15:45–16:00, V57.06
Detection electronics at the Penning-trap mass spectrometer PENTATRAP — •Andreas Dörr1,2, Christine Böhm1,2,3, Sergey Eliseev2, Mikhail Goncharov2, Julia Repp1,2, Christian Roux1,2, Sven Sturm2,4, Stefan Ulmer5, and Klaus Blaum1,2 — 1Fakultät für Physik und Astronomie, Ruprecht-Karls-Universität, 69120 Heidelberg, Germany — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 3ExtreMe Matter Institute EMMI, Helmholtz Gemeinschaft, 64291 Darmstadt, Germany — 4Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 5Atomic Physics Laboratory, RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan
The five Penning-trap mass spectrometer PENTATRAP is currently being built 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 for. 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 a cryogenic high-Q inductance, configured either as a copper wire coil or as a superconducting toroid, in both cases mounted in a copper housing. The following amplification stages consist of cryogenic GaAs FET amplifiers, which provide high input impedances and have low input-related noise densities. With these cryogenic detection systems, the tiny image currents (∼fA) induced by a single ion become detectable. The current status of the detection electronics as well as future perspectives will be presented in the talk.