Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.23: Poster
Tuesday, March 9, 2004, 13:30–15:30, Foyer
Measurements on a focusing drift tube cavity — •Kai-Uwe Kuehnel1, Carsten Peter Welsch2, and Alwin Schempp1 — 1IAP Frankfurt — 2MPI-K Heidelberg
The efficiency of RFQs decreases at higher particle energies. The DTL structures used in this energy regions have a defocusing influence on the beam. To achieve a focusing effect, fingers with quadrupole symmetry were added to the drift tubes. Driven by the same power supply as the drift tubes, the fingers do not need an additional power source or feedthrough. The beam dynamics have been calculated with PARMTEQ and the rf properties have been examined using Microwave Studio. A compact spiral loaded cavity with four accelerating gaps has been built for light ions with an energy of 2 MeV/u. The overall length of the cavity is 0.36 m with a cell length of 61 mm. The design frequency is 160 MHz. The results of the low level measurements as well as bead pertubation measurements are shown.