Hannover 2010 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 8: Poster
MS 8.17: Poster
Thursday, March 11, 2010, 16:00–18:00, Lichthof
Design and Construction of an Energy Buncer for a Multiple-Reflection Time-of-Flight Isobar Separator — •Felix Lautenschläger1, Timo Dickel1, Hans Geissel1,2, Christian Jesch1, Wolfgang R. Plass1,2, Christoph Scheidenberger1,2, and Mikhail I. Yavor3 — 1Justus-Liebig-Universität Giessen — 2GSI, Darmstadt — 3Inst. for Analytical Instrum., Russian Academy of Sci., St. Petersburg
A high resolution, multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) has been developed. It can be used as an isobar separator delivering an isobarically clean beam of short-lived nuclei to connected experiments. The ions are injected into the MR-TOF-MS analyser by an ion trap system with a kinetic energy of 1.5 keV. The longitudinal spatial distribution of the ions inside the ion trap causes an energy spread of the injected ion population.
In order to efficiently recapture these ions after mass separation, it is necessary to reduce the energy spread.This is achieved by employing a homogenous electric field, in which the ions are retarded until they have almost the same kinetic energy.
Then, the field is pulsed down and the almost monenergetic ions are injected into an accumulation trap.
The energy buncher consists of two systems of ring electrodes.
The first system reduces the energy spread, while the second decelerates and focuses the ions into
the accumulation trap.
In the simulation, the average energy spread of the ions has been reduced by a factor of 13.
The design of the energy buncher, simulations and first experimental results will be shown.