Speaker
Slavomir Entler
(Institute of Plasma Physics of the CAS)
Description
A prototype electronics for the ITER ex-vessel steady state magnetic field metallic Hall sensors based on the analog lock-in signal processing with dynamic quadrature offset cancelation was developed and tested. Testing was carried out on Bismuth Hall sensors placed in the SAMM test assembly.
The magnetic coils are used for measuring the magnetic field of the fusion reactor conventionally. However, the inductive sensors measure only the magnetic field changes. The ITER and DEMO applications need the steady-state magnetic field sensors like Hall sensors. Commercially available Hall sensors based on semiconductors have a very limited range of operating temperatures and sensitivity to radiation. Metallic Hall sensors provide temperature and radiation resistance but are much less sensitive. Therefore, the output signal of the metallic Hall sensors has to be processed by special methods allowing measurement of the signal microvolt level with the high noise and distortion immunity.
The paper describes signal processing methods, prototype electronics, and its testing. Three measuring methods are evaluated – DC signal processing, AC digital lock-in signal processing and AC analog lock-in signal processing with dynamic quadrature offset cancelation. The accuracy and linearity of the methods are compared in a magnetic field range of 0 – 0.5 T.
Co-authors
George Vayakis
(ITER Organization, Route de Vinon-sur-Verdon, 13076 St. Paul-lez-Durance, France)
Ivan Duran
(Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Praha 8, Czech Republic)
Jiri Vlcek
(Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Praha 8, Czech Republic)
Martin Kocan
(ITER Organization, Route de Vinon-sur-Verdon, 13076 St. Paul-lez-Durance, France)
Petr Sladek
(Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Praha 8, Czech Republic)
Slavomir Entler
(Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Praha 8, Czech Republic)
