Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session UP11: Poster Session VIII: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Whole Device Modeling, High Field Tokamaks, Tokamak Physics, DIII-D
FUND:Reconnection, Turbulence
2:00 PM - 5:00 PM
Thursday, October 20, 2022
Room: Exhibit Hall A and Online
Abstract: UP11.00008 : Improved magnetic diagnostics on General Fusion Plasma Injector 3
Presenter:
Filiberto G Braglia
(General Fusion)
Authors:
Filiberto G Braglia
(General Fusion)
Curtis Gutjahr
(General Fusion)
Stephen Bolanos
(General Fusion)
Mohamed Ahmed
(General Fusion)
The main sources of uncertainty were identified across the full diagnostic stack (sensor, data acquisition, calibration, data processing) through bench tests and simulations. The single largest source of error for most sensors was found to be temperature-dependent drifts of the DAQ gain, corrected with hardened components and software corrections based on predictive models of the system response. A robust calibration strategy was also devised to better constrain and quantify residual errors from the frequency calibration required by GF’s diagnostic setup.
The resulting improvements brought the uncertainty on Pi3's B-probes from an estimated relative error of ~15% to a measured ~5% on most sensors. No significant offsets are detected for B-probes at the same axisymmetric locations, whose measurements fall within the typical sensor’s instrumental noise (<~5 mT), confirming the accuracy of the improved sensors.
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