Journal article

Publication year: 2007

Pages: 479-484

Journal: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

Volume number: 258

Issue number: 2

ISSN: 0168-583X

DOI Link: https://doi.org/10.1016/j.nimb.2007.01.291

Publisher: Elsevier

Abstract: 
The extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell were measured and chemical processes occurring during extraction of the stopped ions were investigated. The measurements were performed using Rn-219 recoil ions from the alpha-decay of a calibrated point-like Ra-223 ion source. The extraction time was measured to be shorter than 10 ms at a helium gas pressure in the gas cell of 40 mbar. Thus, nuclides with half-lives on the order of a few milliseconds are accessible for the various precision experiments planned at SHIPTRAP. Extraction efficiencies of up to 30% were obtained at a helium pressure of 50 mbar. The estimated total efficiency of the gas cell, derived from the product of calculated stopping and measured extraction efficiency, amounts to about 10%. Factors limiting the efficiency are quantitatively understood. Under standard operating conditions, ion molecule reactions in the gas cell do not seem to limit the efficiency of the gas cell significantly. (c) 2007 Elsevier B.V. All rights reserved.

Harvard Citation style: Eliseev, S., Block, M., Chaudhuri, A., Di, Z., Habs, D., Herfurth, F., et al. (2007) Extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 258(2), pp. 479-484. https://doi.org/10.1016/j.nimb.2007.01.291

APA Citation style: Eliseev, S., Block, M., Chaudhuri, A., Di, Z., Habs, D., Herfurth, F., Kluge, H., Neumayr, J., Plass, W., Rauth, C., Thirolf, P., Vorobjev, G., & Wang, Z. (2007). Extraction efficiency and extraction time of the SHIPTRAP gas-filled stopping cell. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 258(2), 479-484. https://doi.org/10.1016/j.nimb.2007.01.291