Speaker
Description
The ITER outer vessel steady-state magnetic field sensors (OVSS) have been calibrated at Argonne National Laboratory’s 4 Tesla Magnet Facility, using a fixture and process developed by Fermilab. The OVSS consists of two bismuth Hall probe sensing layers and onboard thermocouple, designed to operate with a measurement error of 4 mT for the magnetic field up to 2.5 T at the OVSS location. To achieve this accuracy, the calibration requires metrology accuracy to 0.5 mrad, temperature measurement accuracy of 6 mK at controlled heating setpoints up to 104 degrees Celsius, and a calibrated magnetic field up to 3 T with a maximum error of 0.02 %. We will present how these requirements were achieved and the fixturing devised to allow the calibration process.
Acknowledgement:
This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. This material is based upon work supported by Strategic Partnership Projects Agreement No. FRA-2020-0005 (ITER Contract Number IO/20/CT/4300002162).
Disclaimer: This report was prepared by Fermi Research Alliance, LLC (FRA) on behalf of the U.S. Department of Energy (DOE), as an account of work sponsored by ITER Organization. Neither FRA, DOE, the U.S. Government, nor any person acting on their behalf: (1) makes any warranty or representation, express or implied, with respect to the information contained in this report; or (2) assumes any liabilities with respect to the use of, or damages resulting from the use of any information contained in the report. The views and opinions expressed herein do not necessarily reflect those of Fusion for Energy nor those of the ITER Organization.
