Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.107: Poster
Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max
Simplified Radio Frequency Quadrupoles with a Linear Axial Field Based on Highly Resistive Electrodes — •Arno Becker1, Timo Dickel1, Hans Geissel1,2, Martin Petrik1, Wolfgang R. Plass1,2, Christoph Scheidenberger1,2, and André Simon1 — 1II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Germany — 2GSI, Darmstadt, Germany
Radio Frequency Quadrupoles (RFQs) are used in different fields of science. In nuclear physics, RFQs are employed for highly efficient transport, storage and cooling of exotic nuclei for precision experiments. In addition to the quadrupole field, which confines the ions in the radial direction, an axial field is required for the ion transport in a buffer gas filled environment.
Generating this axial field is a technical challenge. A novel and convenient method for the creation of an axial field is based on four highly resistive plastic rods. In addition to the RF voltage for the confining quadrupole field, different DC potentials are applied to the two ends of each rod. The voltage drop along the electrodes generates a linear axial field.
This method allows for a simplified construction and a reduced number of power supplies and electrical connections. Applications include cooler quadrupoles, curved RFQs as ion guides or for beam distribution, and diagnosis modules that alternatively transmit or identify ions. The design and experimental results of such RFQ systems will be presented.