Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.33: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Investigation of the SHIPTRAP gas cell — •Sergey Eliseev — GSI,Planckstr.1,64291 Darmstadt

The SHIPTRAP double penning trap mass-spectrometer installed behind SHIP is designed for precision mass measurements of very heavy nuclei. The key component determining the overall efficiency of the spectrometer is the gas stopping cell. The stopping and extraction efficiency as well as the extraction time of the gas cell were examined with a ²²³Ra-ion source for several pressures of the He stopping gas. The stopping efficiency at the working pressure of 40 mbar amounts to 40% and increases with the pressure. The extraction efficiency was measured to be about 25%. The extraction time was of the order of 15 ms and consistent with the calculations. The influence of the ion diffusion in the stopping gas and of the contamination of the stopping gas on the performance of the gas cell are considered. A further improvement of the gas cell, based on the results of this investigation, is planned.