Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Precision Spectroscopy of Atoms and Ions VI
A 35.5: Vortrag
Freitag, 6. März 2009, 12:00–12:15, VMP 6 HS-B
Development of improved detection electronics for the g-factor experiment on highly-charged ions — •Sven Sturm1, Klaus Blaum2, Wolfgang Quint3, Birgit Schabinger1, and Anke Wagner2 — 1Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 3GSI Darmstadt, 64291 Darmstadt, Germany
For the high-precision measurement of the magnetic moment of the electron bound in highly-charged calcium ions [1] extremely sensitive detection electronics are needed. The cryogenic amplifier systems used in former experiments [2] was shown to limit the accessible measurement accuracy for the g-factor by raising the necessity to increase the ion temperature to ∼200 K. Therefore, a novel cryogenic ultra low noise amplifier was developed, realizing previously unmatched noise performance and detection sensitivity for the axial motion of medium-heavy ions in Penning traps. The noise performance especially in the interesting range from 100 kHz - 1 MHz and the negligible feedback even on tank circuits with very high quality factors will allow for a considerably decreased axial ion temperature and thus for an improved measurement accuracy. Exploiting the extremely low noise temperature (<1K) of the amplifier, ion temperatures far below the trap ambient temperature of 4.2 K might become accessible. The design and setup of the amplifier system will be presented and first results will be shown.
[1] M. Vogel et al., Nucl. Inst. Meth. B 235, 7 (2005)
[2] G. Werth et al., Int. J. Mass Spec. 251, 152 (2006)