Fiber-Optic Current Sensor Concept for the T-15MD Tokamak.
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| Title: | Fiber-Optic Current Sensor Concept for the T-15MD Tokamak. |
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| Authors: | Sarancha, G. A.1,2 (AUTHOR) sarancha.ga@phystech.edu, Drozd, A. S.1,3 (AUTHOR) drozd_as@nrcki.ru, Kudashev, M. S.3 (AUTHOR) motkudashev@gmail.com, Sergeev, D. S.1 (AUTHOR) sergeev_ds@nrcki.ru |
| Source: | Physics of Atomic Nuclei. 2025 Suppl 1, Vol. 88, pS21-S28. 8p. |
| Subjects: | Tokamaks, Plasma diagnostics, Reliability in engineering, Interferometers, Faraday effect, Optical fiber detectors, Magnetooptics |
| Abstract: | Classic methods for plasma current measurement in tokamaks based on Faraday's law of induction (Rogowski coil) or the Hall effect (Hall sensor) have a number of disadvantages that can be most acute in fusion reactor steady-state operating regimes (strong stray fields, operation in a long pulse with a constant plasma current). To ensure reliability of the measurements, the use of current sensors based on other physical principles may be required. Such a sensor is a fiber-optic current sensor (FOCS) based on the magneto-optic effect (Faraday effect). An analysis of international experience in FOCS application for plasma current measurements (JET, EAST, Tore-Supra tokamaks, etc.) was carried out in this work. Based on analysis, the concept of an improved FOCS measurement scheme for the T-15MD tokamak was proposed. The proposed FOCS reflective (double-pass) circuit, operating on the interferometer principle with probing at an intermediate frequency, will make it possible to carry out measurements over the entire designed range of plasma currents (up to 2 MA) with an error of 0.5 kA and a time resolution of 100 μs. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Classic methods for plasma current measurement in tokamaks based on Faraday's law of induction (Rogowski coil) or the Hall effect (Hall sensor) have a number of disadvantages that can be most acute in fusion reactor steady-state operating regimes (strong stray fields, operation in a long pulse with a constant plasma current). To ensure reliability of the measurements, the use of current sensors based on other physical principles may be required. Such a sensor is a fiber-optic current sensor (FOCS) based on the magneto-optic effect (Faraday effect). An analysis of international experience in FOCS application for plasma current measurements (JET, EAST, Tore-Supra tokamaks, etc.) was carried out in this work. Based on analysis, the concept of an improved FOCS measurement scheme for the T-15MD tokamak was proposed. The proposed FOCS reflective (double-pass) circuit, operating on the interferometer principle with probing at an intermediate frequency, will make it possible to carry out measurements over the entire designed range of plasma currents (up to 2 MA) with an error of 0.5 kA and a time resolution of 100 μs. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10637788 |
| DOI: | 10.1134/S1063778825130101 |
