Upgrading a high-throughput spectrometer for high-frequency (<400 kHz) measurements

T. Nishizawa, M. D. Nornberg, D. J. Den Hartog, D. Craig

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The upgraded spectrometer used for charge exchange recombination spectroscopy on the Madison Symmetric Torus resolves emission fluctuations up to 400 kHz. The transimpedance amplifier's cutoff frequency was increased based upon simulations comparing the change in the measured photon counts for time-dynamic signals. We modeled each signal-processing stage of the diagnostic and scanned the filtering frequency to quantify the uncertainty in the photon counting rate. This modeling showed that uncertainties can be calculated based on assuming each amplification stage is a Poisson process and by calibrating the photon counting rate with a DC light source to address additional variation.

Original languageEnglish
Article number11E530
JournalReview of Scientific Instruments
Issue number11
Publication statusPublished - Nov 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation


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