• U. Bartz, A. Bechtold, J.M. Maus, N. Mueller, A. Schempp
  IAP, Frankfurt am Main

A short RFQ prototype was built for tests of high power RFQ structures. We will study thermal effects and determine critical points of the design. Simulations with CST Microwave Studio and first measurements were done. First results and the status of the project will be presented.

• J.M. Maus, U. Bartz, R.A. Jameson, N. Mueller, A. Schempp
  IAP, Frankfurt am Main

For the development of high energy and high duty cycle RFQs accurate particle dynamic simulation tools are important optimize designs especially in high current applications. To describe the external fields in RFQs the Poisson equation has to be solved taking the boundary conditions into account. In the newly developed subroutines this is done by using a finite difference method on a grid. The results of this improvement are shown and compared to the old two term and multipol expansions.

• N. Mueller, U. Bartz, D. Ficek, P. Kolb, J.M. Maus, A. Schempp, M. Vossberg
  IAP, Frankfurt am Main

Funneling is a method to increase low energy beam currents in multiple stages. The Frankfurt Funneling Experiment is a model of such a stage. The experiment is built up of two ion sources with a electrostatic lens systems, a Two-Beam RFQ accelerator, a funneling deflector and a beam diagnostic system. The two beams are bunched and accelerated in a Two-Beam RFQ and the last parts of the RFQ electrodes achieve a 3d focus at the crossing point of the two beam axis. A funneling deflector combines the bunches to a common beam axis. The optimized ion sources are adapted to the front end bunching section. Recent funneling measurements with the one-gap and the multi-gap deflector will be presented.