Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Precision Mass Spectrometry and Fundamental Applications
MS 4.4: Vortrag
Dienstag, 15. März 2011, 11:45–12:00, GÖR 229
Minimization of environmental influences for precision mass measurements in THe-Trap — •Sebastian Streubel1, Christoph Diehl1, Martin Höcker1, Jochen Ketter1, David B. Pinegar1, Marius Tremer1, Robert S. Van Dyck Jr.2, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Department of Physics, University of Washington, Seattle, WA 98195-1560, USA
THe-Trap is a double-Penning trap mass spectrometer dedicated to measure the mass ratio of 3H to 3He with an uncertainty of 10−11 and below. This would allow an independent measurement of the tritium Q-value, which is of relevance for the determination of the electron antineutrino mass by the KArlsruhe TRItium Neutrino Experiment (KATRIN). A control of the environmental influences is important to achieve the desired precision. Due to a temperature dependent magnetic susceptibility of the surrounding materials, the pressure and the level of the liquid helium around the traps are stabilized. With the same purpose the ambient temperature in the room is regulated. A pair of Helmholtz coils is used to minimize external fluctuations of the geomagnetic field. The remaining field fluctuation will be measured by a stored single C4+ Ion.
The stabilization systems as well as their performances will be presented.