Speaker
Description
Cryogenic Current Comparators (CCC) with SQUID readout are used at GSI Darmstadt and the future FAIR facility for non-invasive measurements of low-intensity ion beams. The current resolution of the device depends strongly on the magnetic and electric disturbances from the surrounding environment, which also vary over time. This work systematically investigates the signal characteristics to enable methods for the targeted suppression of periodic disturbance components.
The CCC is equipped with two inversely connected SQUID sensors that detect the same physical signal. Measurements with defined excitations are analyzed in terms of amplitude, phase, coherence, and temporal stability. Useful signals appear in both SQUIDs with nearly identical amplitude and a 180° phase shift, whereas the periodic disturbances show different phases and amplitudes. Since intervals without beam signal occur between measurements, disturbances can be separately recorded and modeled in these periods.
Our analysis investigates methods that use phase- and amplitude-based combinations of both channels to selectively compensate variable disturbances, significantly improving the signal-to-interference ratio (SIR) and the reliable detection of weak beam-induced signals under real conditions. Our general approach as well as first results of our filtering schemes are presented in this contribution.
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