J. Szerypo

Performance of the MLL-IonCatcher

The MLL-IonCatcher is a new setup for the thermalization of fusion-evaporation reaction products in highly pure helium with subsequent extraction of the stopped, singly charged ions. The setup consists of a buffer-gas stopping cell and a radio frequency quadrupole (RFQ)-based extraction system and is placed at the Tandem accelerator facility of the MLL in Garching. Test experiments were performed using the α emitter Er152 with total kinetic energies of around 180keV∕u, produced via the reaction Sb121(Cl35,4n). During the on-line measurements the number of ions entering the stopping chamber through the entrance window was determined via the detection of their specific α-decay energy. After being thermalized in the helium buffer gas at 40–140mbar the ions were guided by a combination of electric rf and dc fields towards the extraction nozzle where the ion transport was taken over by the gas flow. Subsequent to the extraction by a supersonic gas jet the ions were separated from the buffer gas and guided by t...

Penning trap for isobaric mass separation at IGISOL

Abstract A cylindrical Penning trap has been built at the ion guide isotope separator facility IGISOL of the University of Jyvaskyla. The main goal of the Penning trap application is to purify low-energy radioactive ion beams. The aim is to make isobarically pure beams. The technical description is presented.

MAFFTRAP: ion trap system for MAFF

Abstract At the future MAFF/FRM-II facility in Munich an ion trap system MAFFTRAP will be built. Its goal is to investigate the neutron-rich, in particular heavy, nuclei from thermal neutron fission and fusion of fission products with heavy target nuclei. Basic aims of these investigations are: radioactive beam cooling and purification for nuclear spectroscopy experiments, precise nuclear mass measurements and charged particle spectroscopy “in-trap”.

The Munich accelerator for fission fragments MAFF

Abstract The Munich Accelerator for Fission Fragments MAFF has been designed for the new Munich research reactor FRM-II. It will deliver several intense beams (∼3×10 11 s −1 ) of very neutron-rich fission fragments with a final energy of 30 keV (low-energy beam) or energies between 3.7 and 5.9 MeV· A (high-energy beam). Such beams are of interest for the creation of super-heavy elements by fusion reactions, nuclear spectroscopy of exotic nuclei, but they also have a potential for applications, e.g. in medicine. Presently the Munich research reactor FRM-II is ready for operation, but authorities delay the final permission to turn the reactor critical probably till the end of 2002. Only after this final permission the financing of the major parts of MAFF can start. On the other hand all major components have been designed and special components have been tested in separate setups.

A new concept for cooling low-energy ion beams

We are investigating a new concept of a buffer gas filled ion cooler built from single radio frequency (RF) ring electrodes. In such a ring electrode structure, the RF potential generates an average repelling short-range force perpendicular to the electrode surfaces. Due to the composition of single rings, the shape of the cooling channel can easily and smoothly be varied, and hence also the direction of the RF forces. As a result, the angular acceptance can be increased by a factor of two in comparison to the maximum acceptance for the present RF quadrupole coolers.

Present status of the Technological Laboratory at the LMU Munich

The Technological Laboratory of LMU is undergoing major changes. Most important of them is raising a DLC-Factory’s for diamond-like-carbon (DLC) foils production and a shutdown of the Hot-Lab Facility. Current Laboratory status and development plans are presented in this paper.