Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Precision Mass Spectrometry and Fundamental Applications II
MS 5.3: Vortrag
Dienstag, 13. März 2012, 14:45–15:00, V57.06
Status of THe-Trap — •Jochen Ketter1, Tommi Eronen1, Martin Höcker1, Sebastian Streubel1, Robert S. Van Dyck Jr.2, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Department of Physics, University of Washington, Seattle, WA 98195-1560, USA
Originally developed at the University of Washington and relocated to the Max-Planck-Institut für Kernphysik in 2008, the Penning-trap spectrometer THe-Trap [1] is specially tailored for a 3H/3He mass-ratio measurement, from which the Q-value of the beta-decay of 3H to 3He can be derived. Improving the current best value [2] by at least an order of magnitude will provide an important independent test parameter for the determination of the electron-antineutrino’s mass by the Karlsruhe Tritium Neutrino Experiment (KATRIN) [3]. However, Penning-trap mass spectrometry has to be pushed to its limits in a dedicated experiment for a sufficiently accurate mass-ratio measurement with a relative uncertainty of 10−11. Unlike the closed-envelope, single-trap predecessor, the new spectrometer features an external ion source, owing to the radioactive nature of tritium, and two traps in order to speed up the measurement cycle. While the double-trap technique holds great promise, it also calls for more intricate procedures, such as ion transfer. Details about the recent progress of the experiment will be given.
[1] C. Diehl et al., Hyperfine Interactions (2011) 199:291–300
[2] Sz. Nagy et al., Europhys. Lett., 74 (3), pp. 404–410 (2006)
[3] E. W. Otten et al., Int. J. Mass Spectrom. 251 (2006) 173–178