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A: Fachverband Atomphysik
A 9: Ultra-cold atoms, ions and BEC (with Q)
A 9.13: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Magnesium Ion Crystals at SpecTrap — •Manuel Vogel1, Zoran Andelkovic1, Gerhard Birkl2, Tobias Murböck2, Wilfried Nörtershäuser3, and Stefan Schmidt3 — 1GSI, 64291 Darmstadt — 2Institut für Angewandte Physik, TU Darmstadt, 64289 Darmstadt — 3Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt
We have investigated laser-cooled magnesium ions stored in a Penning trap. The ions are produced externally and are dynamically captured in the trap. We have combined buffer-gas cooling and laser cooling, thus reducing the ion temperatures from Mega-Kelvin to milli-Kelvin on the timescale of seconds. At this temperature, the ions adopt crystalline structures. For ion numbers of the order of a few thousand, these so-called ’mesoscopic’ ion crystals display shell structures depending on experimental parameters, which we have visualized by use of a CCD camera. We have investigated the fluorescence signal depending on laser parameters and characterized the crystal structures. This is part of the sympathetic cooling of highly-charged ions as a next step in the framework of the SpecTrap experiment at the HITRAP facility at GSI/FAIR.