Author: Tanio, L.Y.
Paper Title Page
WEPAB330 A Multirange Low Noise Transimpedance Amplifier for Sirius Beamlines 3447
 
  • L.Y. Tanio, F.H. Cardoso, M.M. Donatti
    LNLS, Campinas, Brazil
 
  In a typical synchrotron beamline, the interaction of photon beams with different materials generates free electric charges in devices such as ionization chambers, photodiodes, or even isolated metallic structures (e.g., blades, blocks, foils, wires). These free charges can be measured as electric current to diagnose the photon beam intensity, profile, position, or stability. Sirius, the new 3GeV fourth-generation Brazilian light source, may accommodate up to 38 beamlines, which combined will make use of hundreds of instruments to measure such low-intensity signals. This work reports on the design and test results of a transimpedance amplifier developed for low current measurements at Sirius’ beamlines. The device presents low noise, high accuracy, and good temperature stability providing 5 selectable ranges (from 500pA to 7.3mA) to measure bipolar currents achieving femtoampere resolution under certain conditions. Considering low bandwidth applications, the results suggest noise performance comparable to commercial bench instruments. Additionally, the project definitions and plans for the development of a family of low current ammeters will be discussed.  
poster icon Poster WEPAB330 [2.642 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB330  
About • paper received ※ 19 May 2021       paper accepted ※ 16 June 2021       issue date ※ 21 August 2021  
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