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- W48804622 abstract "AMS (Accelerator Mass Spectrometry) is a technique to measure long-lived radionuclides with an extreme abundance sensitivity (e.g. C-14/C-12 ~ 1x10^-15). At the very end of the detection beamline, a high-resolution detector providing multiple energy loss signals, can obtain sufficient information for final identification of the individual ions at energies around 1 MeV/amu. The availability of thin, amorphous and homogeneous silicon nitride foils, used as entrance window, triggered a revival of ionization chambers. The energy resolution at low energies is no longer limited by additional energy loss straggling in the window.Based on detailed investigations of recent experimental data for isobar separation of Cl-36 from S-36 and results of simulations, a new state-of-the-art gas ionization chamber comprising multiple anodes was designed and built at VERA (Vienna Environmental Research Accelerator).The flexible, easy-to-modify design of the new chamber allowed to explore the influence of different geometrical parameters on the total energy resolution. One important outcome is that the gas contribution to the energy resolution is smaller than expected by previous evaluations (140 keV vs. 170 keV with 24 MeV chlorine/sulfur ions).Measurement series with a variety of isotopes were performed to get information on the performance of the detector under realistic conditions. For the chlorine/sulfur isobars at 24 MeV an absolute energy resolution of 157 keV (0.66% relative resolution) could be reached. For beryllium/boron the resolution was 0.86% for 7.2 MeV ions. This is a significant improvement compared to the previously used compact ionization chamber (1.0% with 7.2 MeV Be/B and 0.86% with 24 MeV Cl/S).In combination with the time-of-flight system at VERA, one configuration of the detector having a large entrance window improves the detection capabilities for measurements of heavy ions, e.g. U-236 at low energies." @default.
- W48804622 created "2016-06-24" @default.
- W48804622 creator A5059645426 @default.
- W48804622 date "2013-01-01" @default.
- W48804622 modified "2023-09-24" @default.
- W48804622 title "Construction of a multi-anode ionization chamber for AMS at VERA" @default.
- W48804622 hasPublicationYear "2013" @default.
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