Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: Precision Spectroscopy of Atoms and Ions I
A 3.3: Vortrag
Montag, 2. März 2009, 15:00–15:15, VMP 6 HS-B
A temperature stabilization system for the spin-flip detection in the g-factor experiment on highly-charged ions — •Anke Wagner1, Klaus Blaum1, Wolfgang Quint2, Birgit Schabinger3, and Sven Sturm3 — 1MPI für Kernphysik, D-69117 Heidelberg, Germany — 2GSI Darmstadt, D-64291 Darmstadt, Germany — 3Institut für Physik, Johannes Gutenberg-University, D-55099 Mainz, Germany
For the high-precision measurement of the magnetic moment of the electron bound in highly-charged calcium ions, the Larmor spin-precession frequency has to be measured [1]. To this end the so called continuous Stern-Gerlach-effect is employed using a magnetic bottle where the axial frequency of an ion stored in a Penning trap depends slightly on its spin orientation, which provides a possibility to detect the spin state [2]. Microwaves are used to induce a spin-flip. By scanning the microwave frequency and measuring the particular spin-flip rate, the Larmor frequency can be determined. To be able to detect the spin-flip, the axial frequency and accordingly the electrode voltage needs to be very stable. To minimize voltage changes due to temperature drifts during the g-factor measurement, a temperature stabilization for the whole setup is under construction. Therefore, a Fuzzy Logic controller was implemented. Its principle and first results, as well as the microwave setup and the spin flip detection technique will be presented.
[1] B. Schabinger et al., J. Phys. 58, 121-124 (2007)
[2] M. Vogel et al., Nucl. Inst. Meth. B 235, 7-16 (2005)