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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation und Anwendungen I

HK 37.9: Vortrag

Donnerstag, 13. März 2008, 18:45–19:00, 2C

A new cryogenic gas-filled stopping chamber for SHIPTRAP — •Sergey Eliseev, Michael Block, Frank Herfurth, H.-Jürgen Kluge, and Gleb Vorobjev — GSI, Darmstadt, Germany

The SHIPTRAP facility at GSI Darmstadt is a unique Penning trap mass spectrometer designed to perform high precision mass measurements [1] on transuranium nuclides produced in fusion-evaporation reactions at the velocity filter SHIP [2].

A crucial element of SHIPTRAP is a gas-filled stopping chamber [3], which transforms a fast ion beam of a few MeV/u from SHIP into a thermally cooled ion beam. Detailed experimental investigations of the gas-filled stopping chamber [4] have revealed bottle necks, which limit the efficiency of SHIPTRAP. In order to improve the SHIPTRAP a novel cryogenic gas-filled stopping chamber has been designed and is presently under construction. The operation at liquid nitrogen temperature results in enhanced stopping and extraction performance. For example, ion losses due to ion diffusion - a significant loss process in the present room temperature chamber - will be substantially reduced. In addition, an influence of impurities on the performance of the chamber will be drastically reduced. All these modifications will allow us to increase the total efficiency of SHIPTRAP by factor of 4-5.

[1] C. Rauth, accepted to PRL

[2] S. Hofmann and G. Münzenberg, Rev. Mod. Phys.72, 733 (2000)

[3] J. B. Neumayr et al., Nucl. Instrum. and Methods B 244, 489 (2006)

[4] S. Eliseev et al., Nucl. Instrum. and Methods B 258, 479 (2007)