Performance assessment of plasma current measurement at JET using fibre optics current sensor

Gusarov, Andrei; Leysen, W.; Beaumont, P.; Wuilpart, Marc; Dandu, PrasadaRaju; Boboc, A.; Croft, D.; Bekris, N.; Batistoni, P.; Contributors, Jet

doi:10.1016/j.fusengdes.2021.112228

Cited by 8 publications

(12 citation statements)

References 9 publications

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“…Two FOCS systems are installed on JET [165] to assess their performance in presence of multi-MA range currents and high neutron flux, from ∼10 10 cm −2 s −1 in D operations to ∼10 12 cm −2 s −1 in DT on the external surface of the vacuum vessel, comparable with that expected in ITER [166]. During 2020 JET operation, measurements were carried out, comparing two FOCS systems.…”

Section: Tests Of Fibre Optic Current Sensor For Itermentioning

confidence: 99%

Overview of JET results for optimising ITER operation

et al. 2022

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The JET 2019-2020 scientific and technological programme exploited the results of years of concerted scientific and engineering work, including the ITER-like wall (ILW: Be wall and W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major Neutral Beam Injection (NBI) upgrade providing record power in 2019-2020, and tested the technical & procedural preparation for safe operation with tritium. Research along three complementary axes yielded a wealth of new results. Firstly, the JET plasma programme delivered scenarios suitable for high fusion power and alpha particle physics in the coming D-T campaign (DTE2), with record sustained neutron rates, as well as plasmas for clarifying the impact of isotope mass on plasma core, edge and plasma-wall interactions, and for ITER pre-fusion power operation. The efficacy of the newly installed Shattered Pellet Injector for mitigating disruption forces and runaway electrons was demonstrated. Secondly, research on the consequences of long-term exposure to JET-ILW plasma was completed, with emphasis on wall damage and fuel retention, and with analyses of wall materials and dust particles that will help validate assumptions and codes for design & operation of ITER and DEMO. Thirdly, the nuclear technology programme aiming to deliver maximum technological return from operations in D, T and D-T benefited from the highest D-D neutron yield in years, securing results for validating radiation transport and activation codes, and nuclear data for ITER.

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Section: Tests Of Fibre Optic Current Sensor For Itermentioning

confidence: 99%

Overview of JET results for optimising ITER operation

et al. 2022

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“…According to (7) and (11), the relationship between the length of PMF and electric current sensing fiber can be given by…”

Section: Relationship Between the Length Of Pmf And Sensing Fibermentioning

confidence: 99%

“…Where L SF and L P MF represent the lengths of the electric current sensing fiber and PMF, respectively, as defined in (7).…”

Section: Relationship Between the Length Of Pmf And Sensing Fibermentioning

confidence: 99%

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Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Zhang

Chen

et al. 2022

IEEE Photonics J.

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We present a method to simultaneously measure the temperature and electric current, which can be applied for the all-fiber optic current sensor (AFOCS) temperature compensation. The Faraday rotation mirror is introduced as the temperature sensing unit based on the all-fiber dual-modulation optic current sensor. The temperature and electric current could be distinguished by the sequence of pulse light received by the photodetector. The working principle of temperature and electric current sensing are analyzed by modeling and simulation. The experiments are designed to confirm the temperature compensation scheme. The relative error of AFOCS decreases from 14% to 2% by temperature compensation, which meets the requirements of micro-current fiber sensing.

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“…AFOCS has many advantages, such as excellent insulation characteristics, simultaneous measurement of AC and DC, flexible sensor diameter, and digital output [2]. It has gradually replaced electromagnetic current transformers in the fields of pulsed current measurement [3], ultra-high voltage electrical network [4], and plasma current measurement [5]. The AFOCS is essential and will play a critical role in the smart grid [6].…”

Section: Introductionmentioning

confidence: 99%

Research on the Dual Modulation of All-Fiber Optic Current Sensor

Zhang

Chen

2022

Sensors

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Acousto-optic modulator (AOM) and electro-optical modulator (EOM) are applied to realize the all-fiber current sensor with a pulsed light source. The pulsed light is realized by amplitude modulation with AOM. The reflected interferometer current sensor is constructed by the mirror and phase modulation with EOM to improve the anti-interference ability. A correlation demodulation algorithm is applied for data processing. The influence of the modulation frequency and duty cycle of AOM on the optical system is determined by modeling and experiment. The duty cycle is the main factor affecting the normalized scale factor of the system. The modulation frequency mainly affects the output amplitude of the correlation demodulation and the system signal-to-noise ratio. The frequency multiplication factor links AOM and EOM, primarily affecting the ratio error. When the frequency multiplication factor is equal to the duty cycle of AOM and it is an integer multiple of 0.1, the ratio error of the system is less than 1.8% and the sensitivity and the resolution of AFOCS are 0.01063 mV/mA and 3 mA, respectively. The measurement range of AFOCS is from 11 mA to 196.62 A, which is excellent enough to meet the practical requirements for microcurrent measurement.

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Performance assessment of plasma current measurement at JET using fibre optics current sensor

Cited by 8 publications

References 9 publications

Overview of JET results for optimising ITER operation

Overview of JET results for optimising ITER operation

Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Research on the Dual Modulation of All-Fiber Optic Current Sensor

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