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Title: FPGA based demodulation of laser induced fluorescence in plasmas

Abstract

We present a field programmable gate array (FPGA)-based system that counts photons from laser-induced fluorescence (LIF) on a laboratory plasma. This is accomplished with FPGA-based up/down counters that demodulate the data, giving a background-subtracted LIF signal stream that is updated with a new point as each laser amplitude modulation cycle completes. We demonstrate using the FPGA to modulate a laser at 1 MHz and demodulate the resulting LIF data stream. Finally, this data stream is used to calculate an LIF-based measurement sampled at 1 MHz of a plasma ion fluctuation spectrum.

Authors:
 [1];  [1]
  1. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Iowa, Iowa City, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540118
Alternate Identifier(s):
OSTI ID: 1433754
Grant/Contract Number:  
FG02-99ER54543
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 4; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Instruments & Instrumentation; Physics

Citation Formats

Mattingly, Sean W., and Skiff, Fred. FPGA based demodulation of laser induced fluorescence in plasmas. United States: N. p., 2018. Web. doi:10.1063/1.4995971.
Mattingly, Sean W., & Skiff, Fred. FPGA based demodulation of laser induced fluorescence in plasmas. United States. doi:10.1063/1.4995971.
Mattingly, Sean W., and Skiff, Fred. Thu . "FPGA based demodulation of laser induced fluorescence in plasmas". United States. doi:10.1063/1.4995971. https://www.osti.gov/servlets/purl/1540118.
@article{osti_1540118,
title = {FPGA based demodulation of laser induced fluorescence in plasmas},
author = {Mattingly, Sean W. and Skiff, Fred},
abstractNote = {We present a field programmable gate array (FPGA)-based system that counts photons from laser-induced fluorescence (LIF) on a laboratory plasma. This is accomplished with FPGA-based up/down counters that demodulate the data, giving a background-subtracted LIF signal stream that is updated with a new point as each laser amplitude modulation cycle completes. We demonstrate using the FPGA to modulate a laser at 1 MHz and demodulate the resulting LIF data stream. Finally, this data stream is used to calculate an LIF-based measurement sampled at 1 MHz of a plasma ion fluctuation spectrum.},
doi = {10.1063/1.4995971},
journal = {Review of Scientific Instruments},
number = 4,
volume = 89,
place = {United States},
year = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: The high level system design. This shows the individual boards used in the VME data acquisition system, and their connections to the PMTs and the computer.

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