Absolute magneto-optical measurement of magnetic field on a long pulse high electrical current driven solenoid

Journal Article · Wed Dec 11 00:00:00 EST 2024 · AIP Advances

DOI:https://doi.org/10.1063/5.0233593· OSTI ID:2584605

Owens, Israel ^[1]; Ulmen, Ben ^[1]; Vigil, Kenny ^[1]; Lucero, Larry ^[1]; Lamppa, Derek ^[1]; Grabowski, Chris ^[1]

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1. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

We describe a direct absolute magneto-optical approach to measuring the magnetic field driven by long pulse width (>5 ms) and high electrical current (∼kA) in a solenoidal coil. The magnetic field and electrical current are among the most important operating parameters in lightning research and electrical power distribution and are essential to understanding the properties of the radiation output in pulsed energy accelerators as well as other research platforms. However, accurately measuring these magnetic fields and electrical currents using conventional electrical diagnostics is difficult due to the strength of ionizing radiation and electromagnetic interference. Our approach uses a fiber coupled laser beam with a rare earth element material sensing crystal that is highly resistant to electromagnetic interference, allows for absolute measurement, and does not require an external calibration. Here, we focus on device theory, operating parameters, magneto-optical results from an experiment on a high current solenoid, and comparison with a calculation of the magnetic field and reference electrical current flowing downstream of the solenoid.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003525
• OSTI ID: 2584605
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 12 Vol. 14; ISSN 2158-3226
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English