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Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 25: Precision Spectroscopy of Atoms and Ions III

A 25.4: Talk

Friday, March 12, 2010, 11:15–11:30, F 107

Application of electronic feedback to aproton stored in a cryogenic Penning trap — •Stefan Ulmer1,2,3, Klaus Blaum2,3, Holger Kracke1, Andreas Mooser1, Wolfgang Quint4, Cricia Rodegheri1, and Jochen Walz11Institut fürPhysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz — 2Max-Planck-Institut für Kernphysik, 69117Heidelberg — 3Ruprecht-Karls-Universität, 69047Heidelberg — 4GSI Darmstadt, 64291 Darmstadt

This experiment aims at the high precision measurement of the g-factor of the proton stored in a cryogenic Penning trap. The comparison of this number to the g-factor of the antiproton will give a stringent test of the CPT symmetry in the baryonic sector. Both quantities will be determined by the measurement of the particles eigenfrequencies in the Penning trap.
The axial frequency is measured with a highly sensitive superconducting detector, including an electronic feedback loop. The measured signal is fed back to the detector. Different aspects of this technique are discussed. Using positive feedback the signal to noise ratio increases. Thus, the axial frequency could be measured within 20 seconds to a relative precision of 10−7. Furthermore with the high signal to noise ratio a novel detection schematic could be applied, which allows for the simultaneous measurement of the three eigenfrequencies of the trapped particle. Using negative feedback in combination with phase sensitive detection of the particle a frequency difference of 200 mHz was resolved in a 2 s measuring cycle. This resolution is sufficient to observe the effect of proton spin quantum jumps in the axial frequency.

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