Stuttgart 2012 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Accelerator Mass Spectrometry and Applications I

MS 7.6: Vortrag

Donnerstag, 15. März 2012, 12:00–12:15, V57.06

Development of an ion source for volatile elements at DREAMS — •Stefan Pavetich, Shavkat Akhmadaliev, Silke Merchel, and Georg Rugel — Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Ion Beam Physics and Materials Research, Dresden, Germany

After successful measurements of 10Be, 26Al and 41Ca [1] at DREAMS (DResden Accelerator Mass Spectrometry), extensive test measurements of 36Cl started. Besides the challenge of separating the stable isobar 36S, which at DREAMS is accomplished by post-stripping and a split-anode-ionization-chamber, the problem of ion source memory must be solved [2]. To characterize this effect we use 35Cl/37Cl samples of natural composition and 35Cl-enriched samples with a 35Cl/37Cl-ratio > 100. Similar measurements at the French AMS facility ASTER [3] showed differences of 2-4% in the 35Cl/37Cl ratios of the highly enriched samples after 24 h of sputtering samples with natural isotopic ratios [3]. To minimize the long-term-memory effect, two modified designs of the original source (HVEE) were constructed at DREAMS. A more open geometry was used to improve the vacuum level, and parts of the target loading system were modified to allow the exchange of the individual cathode aperture with each target.

[1] G. Rugel, these proceedings.

[2] K.M. Wilcken et al. NIM B, 268 (2010) 748-751

[3] M. Arnold et al. The French accelerator mass spectrometry facility ASTER after 4 years: Status and recent developments on 36Cl and 129I, article submitted NIM B

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