München 2006 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 59: Instrumentation und Anwendungen

HK 59.7: Talk

Friday, March 24, 2006, 15:45–16:00, H

The performance of the MLL-IonCatcher* — •J.B. Neumayr, D. Habs, S. Heinz, V.S. Kolhinen, M. Sewtz, J. Szerypo, and P.G. Thirolf — Ludwig-Maximilians-Universität München

The new MLL-IonCatcher set-up is designed for the thermalisation of fusion-evaporation reaction products in highly pure helium with subsequent extraction as singly-charged ions and is located at the accelerator laboratory of the MLL in Garching. The set-up consists of a buffer-gas stopping cell and an RFQ-based extraction system and was tested on-line using the α-emitting reaction product ¹⁵²Er (E_tot≈180 keV/u). During the measurements the number of ions entering the stopping chamber through the entrance window was determined via the detection of their specific α-decay energy. Inside the gas cell they were thermalised in helium buffer gas at 40-140 mbar. Then they were guided by a combination of electric RF- and DC-fields towards the extraction nozzle where the transport was taken over by the gas flow through the nozzle. After the extraction via a supersonic gas jet the ions were separated from the buffer gas and guided by the extraction RFQ towards a Si detector for the determination of the specific α-decay energy. Depending on the electric field strength and the buffer-gas pressure an overall efficiency (stopping and extraction) of 10-16% (for 90-100 mbar) has been achieved. ^* Supported by GSI F&E under contract LM/HA2 and EU (IONCATCHER) under contract HPRI-CT-2001-50022