Hannover 2013 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 8: Poster
MS 8.13: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
Simulation, Design and Measurements of an RF Carpet for the Cryogenic Stopping Cell for the the Super-FRS — •Samuel Ayet San Andrés1, Timo Dickel1,2, Peter Dendooven3, Hans Geissel1,2, Wolfgang R. Plass1,2, Sivaji Purushothaman1, Pascal Reiter2, Christoph Scheidenberger1,2, Frans Schreuder3, and Daniel Schäfer2 — 1GSI Helmholtzzentrum für Schwerionenforschung GmbH — 2Justus-Liebig-Universität Giessen — 3Kernfysisch Versneller Instituut (KVI)
In order to provide radioactive ions almost at rest from a high energy beam to different precision experiments, the ions need to be stopped and thermalized. This can be achieved using a cryogenic gas-filled stopping cell where the ions are slowed down to almost at rest and extracted. A RFQ beam line can be used to transmit the extracted ions to a multiple-reflection time-of-flight mass spectrometer.
To extract the stopped ions from the stopping cell we generate with the RF Carpet RF fields to repel the ions and don't let them impinge on the RF Carpet and DC fields in order to focus the ions towards the extraction hole. Also the gas flow through the exit hole will pull the ions along the extraction hole. Simulations were made to determine the operation frequency of the system needed to extract the ions of the desired mass. The electronics of the RF Carpet were designed for the desired operation frequency, trying to dissipate as less heat as possible. In this poster, simulations of ion motion in the stopping cell, the electronic design of the RF Carpet and firsts measurements will be presented.