Constraints on conceptual design of diagnostics for the high magnetic field COMPASS-U tokamak with hot walls

Weinzettl, V.; Adámek, Jiřı́; Bílková, P.; Havlíček, J.; Pánek, R.; Hron, M.; Bogar, O.; Böhm, P.; Casolari, A.; Cavalier, J.; Dejarnac, R.; Dimitrova, M.; Ďuran, I.; Entler, Slavomír; Ficker, O.; Hacek, P.; Horáček, J.; Imríšek, M.; Jaulmes, F.; Kovařík, K.; Krbec, J.; Kripner, L.; Markovič, T.; Naydenkova, D.; Peterka, M.; Podolník, A.; Pova, F.; Šos, M.; Šesták, D.; Tomeš, M.; Varavin, M.; Varju, J.; Vondráček, P.; Zaja̧c, J.

doi:10.1016/j.fusengdes.2019.03.020

Cited by 21 publications

(6 citation statements)

References 38 publications

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“…The transmutation analysis indicated a high resistance Metal Hall sensors will also be a part of the diagnostics of the new COMPASS-U tokamak, which is under construction at IPP. The COMPASS-U tokamak will operate at a high magnetic field of 5 T and a first wall temperature of up to 500 • C [36].…”

Section: Discussionmentioning

confidence: 99%

Ceramic-Chromium Hall Sensors for Environments with High Temperatures and Neutron Radiation

Entler

Šobáň

Ďuran

et al. 2021

Sensors

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Ceramic-chromium Hall sensors represent a temperature and radiation resistant alternative to Hall sensors based on semiconductors. Demand for these sensors is presently motivated by the ITER and DEMO nuclear fusion projects. The developed ceramic-chromium Hall sensors were tested up to a temperature of 550 °C and a magnetic field of 14 T. The magnitude of the sensitivity of the tested sensor was 6.2 mV/A/T at 20 °C and 4.6 mV/A/T at 500 °C. The sensitivity was observed to be weakly dependent on a temperature above 240 °C with an average temperature coefficient of 0.014%/°C and independent of the magnetic field with a relative average deviation below the measurement accuracy of 0.086%. A simulation of a neutron-induced transmutation was performed to assess changes in the composition of the chromium. After 5.2 operational years of the DEMO fusion reactor, the transmuted fraction of the chromium sensitive layer was found to be 0.27% at the most exposed sensor location behind the divertor cassette with a neutron fluence of 6.08 × 1025 n/m2. The ceramic-chromium Hall sensors show the potential to be suitable magnetic sensors for environments with high temperatures and strong neutron radiation.

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Section: Discussionmentioning

confidence: 99%

Ceramic-Chromium Hall Sensors for Environments with High Temperatures and Neutron Radiation

Entler

Šobáň

Ďuran

et al. 2021

Sensors

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“…It is limited by the surface water boiling which was, by the way, just recently overcome 12 . Testing survival under those extreme conditions (mostly using liquid metal heat shield 13 ) will be one of two major goals of tokamak COMPASS-Upgrade 14 , 15 , capable of reaching 100 MW/m 16 . This is, for better imagination, comparable to the Sun surface 63 MW/m radiation.…”

Section: Thermonuclear Fusion Reduction Due To Elm-induced Tungsten D...mentioning

confidence: 99%

Novel concept suppressing plasma heat pulses in a tokamak by fast divertor sweeping

Horáček

Lukes

Adámek

et al. 2022

Sci Rep

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One of the remaining challenges in magnetic thermonuclear fusion is survival of the heat shield protecting the tokamak reactor vessel against excessive plasma heat fluxes. Unmitigated high confinement edge localized mode (ELM) is a regular heat pulse damaging the heat shield. We suggest a novel concept of magnetic sweeping of the plasma contact strike point fast and far enough in order to spread this heat pulse. We demonstrate feasibility of a dedicated copper coil in a resonant circuit, including the induced currents and power electronics. We predict the DEMO ELM properties, simulate heat conduction, 3D particles motion and magnetic fields of the plasma and coil in COMSOL Multiphysics and Matlab. The dominant system parameter is voltage, feasible 18 kV yields 1 kHz sweeping frequency, suppressing the ELM-induced surface temperature rise by a factor of 3. Multiplied by other known mitigation concepts, ELMs might be mitigated enough to ensure safe operation of DEMO.

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“…The diagnostics in COMPASS-U will be subjected to challenging constraints [3], namely, high temperature of the vacuum vessel and plasma-facing components (500 • C), high plasma density (up to 8 × 10 20 m −3 ), high heat-flux density to the metallic plasma-facing components (PFCs) above several tens of MW/m 2 , strong auxiliary plasma heating (several MW of NBI and ECRH), spatial constraints and liquid metals in the divertor. The tokamak is expected to operate with a strike-point sweeping or in a partial detachment regime to reduce the heat flux to the divertor in order to remain below the point of tungsten recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Embedded-probes diagnostics for the COMPASS upgrade tokamak: a concept

et al. 2022

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This article introduces a concept based on flush-mounted probes embedded in the limiters of the COMPASS-Upgrade tokamak. Main issues related to flush probe geometry are taken into account and discussed. Calculations of heat fluxes and the incident angle of the field lines on the different limiters using the PFCflux code are performed to support in probe arrangement optimization. Model current-voltage characteristics for a flush probe are simulated using the SPICE2 code and their dependence on the angle of incidence is studied. The results are used to predict the current to be collected by the flush probes for different magnetic fields and to examine the reliability of the proposed diagnostics. A discussion is included on the capability of the electronic system considered for the measurements.

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Constraints on conceptual design of diagnostics for the high magnetic field COMPASS-U tokamak with hot walls

Cited by 21 publications

References 38 publications

Ceramic-Chromium Hall Sensors for Environments with High Temperatures and Neutron Radiation

Ceramic-Chromium Hall Sensors for Environments with High Temperatures and Neutron Radiation

Novel concept suppressing plasma heat pulses in a tokamak by fast divertor sweeping

Embedded-probes diagnostics for the COMPASS upgrade tokamak: a concept

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