Magnetic Probe Construction using Thick-Film Technology
Authors: H. Takahashi, S. Sakakibara, Y. Kubota, and H. Yamada
Date of PPPL Report: May 2001
Published in: Rev. Sci. Instrum. 72 (August 2001) 3249-3259.
Thick-film technology has been successfully adapted for the design and fabrication of magnetic probes of a new type suitable for use in the simultaneous ultra-high vacuum and high-temperature environment of a nuclear fusion device. The maximum usable temperature is expected to be around 900 degrees C. This new probe has a specific sensitivity (coupling area per unit volume) an order of magnitude higher than a conventional coil. The new probe in one implementation is capable of simultaneously measuring magnetic field in three orthogonal directions about a single spatial point and in two frequency ranges. Low-frequency coils have a measured coupling area of 296-323 cm2 and a frequency response of about 300 kHz. High-frequency coils have a design coupling area of 12-15 cm2.