| Autor: |
Dietrich Habs, Z. Wang, G. Vorobjev, J. B. Neumayr, Hans-Jürgen Kluge, Michael Block, P. G. Thirolf, Wolfgang R. Plaß, A. Chaudhuri, F. Herfurth, C. Rauth, Z. Di, Sergey Eliseev |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 258:479-484 |
| ISSN: |
0168-583X |
| Popis: |
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 219Rn recoil ions from the α-decay of a calibrated point-like 223Ra 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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