7–11 Sept 2025
Teaching Hub 502
Europe/London timezone

Development of a wide dynamic range and high-precision ammeter for beamline instrumentation at SIRIUS

MOPMO05
8 Sept 2025, 16:00
2h
Mountford Hall, Liverpool Guild of Students

Mountford Hall, Liverpool Guild of Students

University of Liverpool
Poster Presentation MC07: Data Acquisition and Processing Platforms MOPMO

Speaker

Patricia Nallin (Brazilian Synchrotron Light Laboratory)

Description

Sirius beamlines require specialized electronic devices to monitor key parameters of the photon beam, such as position and flux, through the detection of extremely low-level electrical currents. Furthermore, experiments conducted in fly-scan mode usually demand fast, high-precision low-level current measurements. To address these requirements, the development of a wide dynamic range ammeter (from 1 pA to 10 mA) has been addressed, based on a logarithmic transimpedance amplifier, eliminating the need for scale switching and featuring high precision and fast response. The proposed device converts the input current into a logarithmic output voltage and offers two operation modes: the logarithmic ammeter and the logarithmic ratiometer, both of which are particularly useful in X-ray spectroscopy experiments. This paper considers an overview of the device as well as its preliminary characterization and results, including logarithmic conformity, bandwidth, and noise.

Funding Agency

The authors would like to thank the Brazilian Ministry of Science, Technology and Innovation for funding this project.

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Author

Vinicius Silva Oliveira (Brazilian Synchrotron Light Laboratory)

Co-authors

Bruno Oliveira (Brazilian Center for Research in Energy and Materials) Fernando Cardoso (Brazilian Synchrotron Light Laboratory) Patricia Nallin (Brazilian Synchrotron Light Laboratory)

Presentation materials

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