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A: Fachverband Atomphysik

A 6: Precision spectroscopy of atoms and ions II

A 6.1: Vortrag

Montag, 14. März 2011, 16:30–16:45, BAR 205

Status of the HITRAP cooler Penning trap. — •Svetlana Fedotova¹, Nikolaas Brantjes¹, Frank Herfurth¹, Nikita Kotovskiy¹, Claude Krantz², Giancarlo Maero³, Wolfgang Quint¹, Mouwafak Shaaban¹, Alexey Sokolov¹, and Jochen Steinmann¹ — ¹GSI Helmholtzzentrum für Schwerionenforshung, Darmstadt — ²Heidelberg University — ³University of Milano

HITRAP is a facility at GSI, Darmstadt for decelerating, cooling and storing of heavy, highly-charged ions. Bunches of up to 10⁵ ions at 6 keV/u, as heavy as U92+, will be injected into the Penning trap for cooling first with electrons and then resistively. Extracted from the trap at low-energy, either quasi-continuous or bunched, ions will be delivered to high-precision atomic physics experiments. The trap is installed into the cold bore of a cryogen-free, 6 T superconducting magnet. Extensive cool down tests provided that the trap electrodes temperature reaches about 10 K which is the temperature the ions are cooled to using resistive cooling. Bunches of 10¹⁰ electrons can be injected into the trap from an electron source installed downstream. The electrostatic potentials of the trap electrodes will be arranged to form a nested trap in order to allow capture both, ions and electrons, simultaneously inside the trap. The sequence of the different processes: electron injection, ion capture in flight, electron and resistive cooling, controlled ejection - requires a sophisticated control system and extensive simulations. The most recent simulations investigate, for instance, the conditions under which the energy spread can be kept low during continuous ejection.