The Frankfurt Funneling Experiment
Funneling is a technique to multiply beam currents of rf-accelerators in several stages at low energies to prevent problems with space charge. The Frankfurt Funneling Experiment is a prototype of such a stage. Two beams are accelerated in a Two-Beam RFQ and combined to one beam axis with a funneling deflector. The last part of the RFQ electrodes of our Two-Beam RFQ has been replaced to achieve a 3d focus of both beams at the beam crossing point behind the RFQ in the center of the deflector. A new designed multi cell funneling deflector and first results of the new experimental set-up will be presented.
DEVELOPMENT OF NEW ION SOURCES FOR THE FRANKFURT FUNNELING EXP RIMENT*
DEVELOPMENT OF NEW ION SOURCES FOR THE FRANKFURT FUNNELING EXP RIMENT* N. Mueller, U.Bartz, P. Kolb, A. Schempp, Institut für Angwandte Physik, Goethe Universitaet, Max-von-Laue Str. 1, D-60438 Frankfurt, Germany Abstract Funneling is a method to increase beam currents in several stages. The Frankfurt Funneling Experiment is a prototype of such a stage. The experimental setup consists of two ion sources with electrostatic lens systems, a TwoBeam 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 newly optimized ion sources are adapted to the front end bunching section. First results and measurements will be presented.
Rf driven multicusp ion source for pulsed or steady-state ion beam production
Abstract An rf driven multicusp source has been operated in both cw and pulsed mode to generate H + and various types of positive ion beams. For inert gas plasmas such as He, Ne, Ar, Kr and Xe, the extractable current density is higher than 1 A/cm 2 . When diatomic gases, such as H 2 , N 2 and O 2 are used for the discharge, the extracted beam contains almost pure atomic ions. Thus, simple accelerator or plasma processing systems can be constructed without the use of mass analyzing magnets. The same source has also been used to produce steady-state beams of metallic ions.