Hannover 2016 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Spectrometry and Fundamental Applications I

MS 1.5: Vortrag

Montag, 29. Februar 2016, 12:15–12:30, f128

Image charge shift simulations for THe-Trap — •Marc Schuh, Martin Höcker, Jochen Ketter, Tom Segal, Sebastian Streubel, Sven Sturm, and Klaus Blaum — Max-Planck-Institut für Kernphysik, 69117 Heidelberg

Tritum-Helium-Trap (THe-Trap) is a precision Penning-trap mass spectrometer [1] at the Max-Planck-Institut für Kernphysik in Heidelberg. While the main goal is to measure the tritium/helium-3 mass ratio with a relative uncertainty of 10 parts per trillion (ppt), the experiment is not limited to the measurement of mass doublets.
In 2014 we reported a measurement of the mass ratio of carbon-12 to oxygen-16 with an uncertainty of 120 ppt, limited by uncertainties of systematic shifts [1]. A later measurement decreased this uncertainty significantly (to be published). One significant systematic shift for the measurements of non mass doublets is caused by image charges on the trap electrodes, which are created by the ion present in the trap. It is possible to simulate this effect reliably by extensive finite element simulations performed with Comsol Multiphysics. The results are in excellent agreement with experimental values [2]. The simulations have been extended to the Mainz g-factor Penning-trap [3], where, where an image charge shift measurement is in progress. In this talk the concept of the simulation and its results are presented.

[1] S. Streubel et al., Appl. Phys. B, doi:10.1007/s00340-013-5669-x

[2] R.S. Van Dyck Jr., International journal of mass spectrometry (2006), doi:10.1016/j.ijms.2006.01.038

[3] S. Sturm et al., Phys. Rev. A 87, doi:10.1103/PhysRevA.87.030501