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Robust identification of multiple-input single-output system response for efficient pickup noise removal from tokamak diagnostics

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/5.0100988· OSTI ID:1895047
 [1];  [2];  [3];  [2];  [3];  [4];  [3]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, NJ (United States)
  3. MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
  4. Brigham Young University, Provo, UT (United States)
+ Show Author Affiliations
We report electromagnetic pickup noise in the tokamak environment imposes an imminent challenge for measuring weak diagnostic photocurrents in the nA range. The diagnostic signal can be contaminated by an unknown mixture of crosstalk signals from coils powered by currents in the kA range. To address this issue, an algorithm for robust identification of linear multi-input single-output (MISO) systems has been developed. The MISO model describes the dynamic relationship between measured signals from power sources and observed signals in the diagnostic and allows for a precise subtraction of the noise component. The proposed method was tested on experimental diagnostic data from the DIII-D tokamak, and it has reduced noise by up to 20 dB in the 1–20 kHz range.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698; SC0014264
OSTI ID:
1895047
Alternate ID(s):
OSTI ID: 1890765
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 93; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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