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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.108: Poster
Thursday, March 19, 2009, 14:00–16:00, Audi-Max
Design, Construction and Commissioning of an RF Trap System for a Multiple-Reflection Time-of-Flight Isobar Separator and Mass Spectrometer — •Christian Jesch1, Timo Dickel1, Wolfgang R. Plaß1,2, Arno Becker1, Ulrich Czok1, Hans Geissel1,2, Martin Petrick1, and Christoph Scheidenberger1,2 — 1Justus-Liebig-Universität Gießen — 2GSI, Darmstadt
A multiple-reflection time-of-flight isobar separator and mass spectrometer (MR-TOF-MS) has been developed, which can be used for isobar separation, broadband mass spectrometry and high-accuracy mass measurement of very short lived nuclei with half-lives on the order of milliseconds. The start of the time-of-flight measurement in the MR-TOF-MS is given by the injection of ions from an RF trap. The performance of the mass spectrometer is significantly determined by the characteristics of the injected ion population.
The newly developed injection trap system provides cooled ion bunches of low emittance. It consists of three stages for fast ion cooling, while avoiding collisional losses during ion ejection. A fast-switching square wave RF source was developed. It allows to switch off the RF during ejection in order to reduce mass selective ion energies. The system was set up and commisioned. Time-of-flight peak widths of < 5 ns have been measured, enabling a mass resolving power of the MR-TOF-MS of 105 after a flight time of 1 ms. Cooling times of down to 1 ms and a high transmission efficiency have been achieved. The design of the trap system and first experimental results will be presented.