Performance of the MLL-IonCatcher
- Department fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, Am Coulombwall 1, 85748 Garching (Germany)
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 {alpha} emitter {sup 152}Er with total kinetic energies of around 180 keV/u, produced via the reaction {sup 121}Sb({sup 35}Cl,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 {alpha}-decay energy. After being thermalized in the helium buffer gas at 40-140 mbar 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 the extraction RFQ towards a Si detector, where the specific {alpha}-decay energy was detected. Depending on the electric field strength and the pressure of the buffer gas an overall efficiency including stopping and extraction between 10% and 16% has been achieved.
- OSTI ID:
- 20853305
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 77; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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