Producing high quality LTCC sensors for ITER in-vessel magnetic diagnostics

Adaikkan, Manikandan; Ma, Y.; Walach, U.; Bochard, Marc; Bechtold, Franz; Vayakis, G.; Walsh, Michael J.; Lino, Maria Paz Casas; Counsell, G.

doi:10.1016/j.fusengdes.2022.113316

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…That would in fact improve the control capabilities of long-lasting discharges of BPXs and DEMOs [4,5]. During the last four decades, significant investments lead to the development of materials and components, and in particular of inductive magnetic sensors [9][10][11][12][13][14][15][16][17][18][19][20][21][50][51][52][53][54][55], capable to withstand the particularly harsh environment present at in-vessel locations. Specifically, the current state of art for in-vessel radiation-hard magnetic field measurement is represented by the LTCC (low temperature cofired ceramic [56]) pick-up coil technology developed for ITER [17,18,54,55].…”

Section: High Performance Hybrid Magnetic Sensorsmentioning

confidence: 99%

Long term operation of the radiation-hard Hall probes system and the path toward a high performance hybrid magnetic field sensor

Quercia

Pironti²,

Bolshakova³

et al. 2022

Nucl. Fusion

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The paper reports a systematic assessment of the Radiation-hard Hall Probes (RHP) magnetic diagnostic system of the JET tokamak, which is based on InSb semiconductor thin ﬁlms, and describes the path that lead to the proposal of an innovative magnetic probe concept. A relevant account of RHP operation during the recent Deuterium-Tritium experimental campaign (DTE2) is also provided, showing correct operation under ITER-like intense neutron ﬂux. The period considered for the systematic assessment of the RHP system ranges from October 2009 to March 2021, during which the machine produced more than 19000 pulses. The RHP system consists of six three-dimensional Hall probes, which have built-in recalibration capability, thanks to the presence of microsolenoids that produce a local known ﬁeld during a tailored automatic pre-pulse calibration sequence, that can also be initiated manually. During pulses, the microsolenoids can also be used as inductive sensors as their signals are recorded as well. Moreover, the system provides temperature measurements at the location of the probes, which are continuously recorded too. The assessment demonstrates accurate long-term operation of the RHP system. All the diagnostic channels reliably provide pre-pulse calibration data and pulse signals and the original sensitivities of the Hall sensors are preserved. Integration considerations and a data fusion analysis lead to the proposal of a high performance, compact, broadband, hybrid ﬁeld probe, consisting of the combination of an inductive coil and a Hall sensor, to be manufactured by means of the coil technology developed for ITER or an alternative concept with improved radiation-hardness. The hybrid probe is expected to deliver the advantages of both inductive and Hall sensing technologies, essentially in the same package size of a single ITER magnetic discrete probe. In particular, it would solve the problem of the drift of the integrator for long lasting burning plasma discharges. The signals produced by the coil and the Hall sensor, processed by means of a Luenberger-Kalman observer, provide a magnetic ﬁeld measurement which is non-drifting and low-noise. For these reasons, the hybrid probe has been proposed as the potential primary magnetic diagnostic sensor for future burning plasma experiments and demonstration fusion power plants.

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Section: High Performance Hybrid Magnetic Sensorsmentioning

confidence: 99%

Long term operation of the radiation-hard Hall probes system and the path toward a high performance hybrid magnetic field sensor

Quercia

Pironti²,

Bolshakova³

et al. 2022

Nucl. Fusion

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High-Field Optical Cesium Magnetometer for Magnetic Resonance Imaging

Stærkind,

Jensen,

Müller

et al. 2024

PRX Quantum

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We present a novel high-field optical quantum magnetometer based on saturated absorption spectroscopy on the extreme angular-momentum states of the cesium D2 line. With key features including continuous readout, high sampling rate, and sensitivity and accuracy in the ppm range, it represents a competitive alternative to conventional techniques for measuring magnetic fields of several teslas. The prototype has four small separate field probes, and all support electronics and optics are fitted into a single 19-inch rack to make it compact, mobile, and robust. The field probes are fiber coupled and made from nonmetallic components, allowing them to be easily and safely positioned inside a 7 T MRI scanner. We demonstrate the capabilities of this magnetometer by measuring two different MRI sequences, and we show how it can be used to reveal imperfections in the gradient coil system, to highlight the potential applications in medical MRI. We propose the term EXAAQ (EXtreme Angular-momentum Absorption-spectroscopy Quantum) magnetometry, for this novel method. Published by the American Physical Society 2024

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