Köln 2004 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 2: Nuclear Structure/Spectroscopy I
HK 2.9: Vortrag
Montag, 8. März 2004, 18:30–18:45, A
An RF ring electrode cooler for intense low-energy ion beams — •S. Heinz1, D. Habs1, S. Hegewisch1, A. Nieminen2, and J. Szerypo1 — 1Ludwig-Maximilians-Universität München — 2University of Jyväskylä, Finland
The phase space cooling of low-energy ion beams can be performed by frictional forces while the ions are interacting with the atoms of a buffer gas. During the cooling process the ions have to be confined in transverse direction by an oscillating electric field. A conventional method for ion confinement is the application of Radio Frequency Quadrupoles (RFQ) which generate a harmonic pseudo potential and operate in the typical pressure range of 0.01 - 0.1 mbar. We are investigating another concept for ion confinement where the RFQ structure is replaced by a stack of Radio Frequency ring electrodes with varying inner diameters (RF funnel). Other than with RFQs the potential created by the RF funnel is box shaped. First experimental investigations with beam currents up to 20 nA showed a very promising transmission characteristics which revealed the applicability of the RF funnel as high-current cooler.