Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Precision spectroscopy of atoms and ions I (with Q)

A 1.1: Vortrag

Montag, 23. März 2015, 11:30–11:45, C/HSW

The Detection System of the ALPHATRAP Experiment — •Andreas Weigel, Robert Wolf, Sven Sturm, and Klaus Blaum — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The Penning-trap experiment ALPHATRAP is currently being set up at the Max-Planck-Institut für Kernphysik in Heidelberg. It is the follow-up to the Mainz g-factor experiment, which has recently succeeded in the most stringent test of quantum electrodynamics in the regime of strong fields on hydrogen-like 28Si13+ at the level of 10−11. ALPHATRAP aims for g-factor measurements on even heavier highly charged ions up to 208Pb81+, with simultaneously improved accuracy. This shall further contribute to the exploration of the limits of bound-state quantum electrodynamics.
The determination of the g-factor is based on the non-destructive determination of the electron spin state inside a magnetic bottle via the continuous Stern-Gerlach effect. For this purpose the ion eigenfrequencies have to be measured via the detection of image currents, which the ion induces into the trap electrodes. These currents are typically on the order of a few femto-Ampère. Therefore, special highly sensitive detection electronics consisting of superconducting tank circuits with extremely high Q-factors followed by ultra-low noise cryogenic amplifiers will be used. This shall allow for a higher signal-to-noise ratio resulting in an increased measurement precision. The ALPHATRAP detection system and electronics design will be presented.

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DPG-Physik > DPG-Verhandlungen > 2015 > Heidelberg