Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Precision spectroscopy of atoms and ions IV (with A)

Q 34.1: Talk

Thursday, March 20, 2014, 10:30–10:45, BEBEL SR140/142

Highly-sensitive image-current detection systems for BASE — •Christian Smorra¹, Kurt Alan Franke^1,2, Andreas Mooser³, Hiroki Nagahama^1,4, Georg Ludwig Schneider^1,3, Klaus Blaum², Yasuyuki Matsuda⁴, Christian Ospelkaus⁵, Wolfgang Quint⁶, Jochen Walz³, Yasunori Yamazaki⁷, and Stefan Ulmer¹ — ¹RIKEN, Ulmer IRU, Japan — ²MPI-K Heidelberg, Germany — ³University of Mainz, Germany — ⁴Tokyo University, Japan — ⁵University of Hannover, Germany — ⁶GSI Darmstadt, Germany — ⁷RIKEN, APL, Japan

The BASE collaboration aims for a ppb measurement of the antiproton magnetic moment by using the so-called double Penning-trap technique. Key components for this measurement are superconducting single-particle image-current detection systems for the determination of the antiproton's motional eigenfrequencies. BASE focused on improving the state-of-the-art detection systems in order to achieve a better signal-to-noise ratio for the axial detection systems and shorter resistive cooling time constants for the cyclotron detectors. Benefits are a higher spin-state detection fidelity, shorter measurement times, faster cooling cycles and lower effective particle temperatures.

The talk gives an overview on the design and characterization of our recenty developed detection systems. Compared to previously used detectors, a factor of five higher signal-to-noise ratio was achieved and the cyclotron cooling times were significantly reduced.