Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Mass Spectrometry - Posters

MS 3.5: Poster

Dienstag, 12. März 2019, 16:30–18:15, S Fobau Physik

Development of an efficient high-current ion source for Accelerator Mass Spectrometry — •Dimitar Yordanov¹, Hans Hofsäss¹, Georg Rugel², Shavkat Akhmadaliev², Johannes von Borany², and Jenny Feige³ — ¹Georg-August-Universität Göttingen — ²Helmholtz-Zentrum Dresden-Rossendorf — ³TechnischeUniversität Berlin

A new concept for Caesium sputtering ion source is studied experimentally and theoretically regarding a development of a new high-efficient and high-current ion source for Accelerator Mass Spectrometry (AMS) to quantify the ratios of long-lived cosmogenic radionuclides in micrometeorites. The source design is modular providing ease of access and simplifying maintenance while having better mechanical stability at the same time. The results show: the geometry of the cathode and the ionizer, as well as the distance between them and the radius of the extraction hole, are factors influencing the ion-optics, the focus of the Cs beam on the sample, the sputtering of the sample and the extracted current of the ions. Moreover, for an additional increase of the sputtering process on the sample, the cathode bias is higher than usual -- up to 20 kV. The experimental results at different configurations of the source are supported by 3D model of the source for the ion-optics and the particle trajectories, as well as Child Langmuir Law is included. The authors would like to thank the Federal Ministry of Education and Research of Germany for its financial support (project 05K2016), and the HZDR's Ion Beam Center for its essential contribution to the realization of this project.