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MS: Fachverband Massenspektrometrie
MS 7: Poster
MS 7.6: Poster
Dienstag, 3. März 2009, 16:00–18:00, VMP 9 Poster
Design of a switchable low-noise power supply — •Jochen Ketter1, Klaus Blaum2, Jens Ketelaer1, Szilard Nagy2, and Sven Sturm1 — 1Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
Triga-Trap [1] aims at mass measurements of heavy ions and neutron-rich fission products. Such on-line mass measurements using small-band and broad-band Ft-Icr in this setup, also allowing for the traditional Tof-Icr method, are particularly challenging. The voltages applied to the trap’s electrodes must be switched within the order of 100 ns for capture and optional ejection, while remaining stable with low noise during the detection of image currents. Switching requires a supply with high power output, but comparatively long idle time with constant trapping voltage does not warrant a fully-featured amplifier. The double-headed approach to the problem capitalizes on these peculiarities to design a power supply specially tailored to the needs of on-line Ft-Icr detection. An electronic switch is at the heart of the power supply. The precision output voltage in the range of ± 200 V is set by a regulator operating a push-pull stage with its own high-voltage supply. The principle of each component and first results will be presented.
[1] J. Ketelaer et al., Nucl. Instr. Meth. A, 594 (2008) 162–177