Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Poster 1

MS 9.5: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal

Development of an efficient high-current ion source for Accelerator Mass Spectrometry — Felipe Lipp Bregolin¹, •Hans Hofsäss¹, Georg Rugel², Shavkat Akhmadaliev², Silke Merchel², and Jenny Feige³ — ¹Georg-August-Universität Göttingen — ²Helmholtz-Zentrum Dresden-Rossendorf — ³Technische Universität Berlin

A new high-current negative ion source for Accelerator Mass Spectrometry (AMS) is being built to quantify the ratios of long-lived cosmogenic radionuclides in micrometeorites, which are of great astrophysical interest. Measuring these extremely small ratios is at the technological limits of present AMS systems. The new source is designed specifically to provide a higher AMS detection sensitivity by having an optimal ion-optics design, incorporating new concepts for the construction and operation of the Cs ionizer, optimized Cs ion beam currents and Cs vapor transport. The operation with higher cathode, extraction and pre-acceleration voltages than usual is possible. Moreover, its design is modular providing ease of access and simplifying maintenance while having better mechanical stability at the same time. Several operational parameters can be controlled and measured during operation to achieve a higher ion source performance. Detailed ion-optics simulations of the ion source are compared with test measurements, and the design optimized based on its results. 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.