The cryogenic gas stopping cell of SHIPTRAP

Droese, C.; Eliseev, Sergey; Blaum, Klaus; Block, M.; Herfurth, F.; Laatiaoui, M.; Lautenschläger, F.; Minaya Ramirez, Enrique; Schweikhard, L.; Simon, V.V.; Thirolf, P.G.

doi:10.1016/j.nimb.2014.08.004

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The cryogenic gas stopping cell of SHIPTRAP

MPG-Autoren

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Eliseev, Sergey
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Minaya Ramirez, Enrique
Helmholtz-Institut Mainz, Johannes Gutenberg-Universität;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://dx.doi.org/10.1016/j.nimb.2014.08.004
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Zitation

Droese, C., Eliseev, S., Blaum, K., Block, M., Herfurth, F., Laatiaoui, M., et al. (2014). The cryogenic gas stopping cell of SHIPTRAP. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 338, 126-138. doi:10.1016/j.nimb.2014.08.004.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0023-EC69-0

Zusammenfassung

The overall efficiency of the Penning-trap mass spectrometer SHIPTRAP at GSI Darmstadt, employed for high-precision mass measurements of exotic nuclei in the mass region above fermium, is presently mostly limited by the stopping and extraction of fusion-evaporation products in the SHIPTRAP gas cell. To overcome this limitation a second-generation gas cell with increased stopping volume was designed. In addition, its operation at cryogenic temperatures leads to a higher gas density at a given pressure and an improved cleanliness of the helium buffer gas. Here, the results of experiments with a ²¹⁹Rn recoil ion source are presented. An extraction efficiency of 74(3)% was obtained, a significant increase compared to the extraction efficiency of 30% of the present gas stopping cell operated at room temperature. The optimization of electric fields and other operating parameters at room as well as cryogenic temperatures is described in detail. Furthermore, the extraction time of ²¹⁹Rn ions was determined for several operating parameters.