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Your search keyword '"Martovetsky, N."' showing total 28 results
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28 results on '"Martovetsky, N."'

1. Selected Topics of Technical Challenges of the ITER Central Solenoid

Author

Miyoshi, Y., primary, Bruton, A., additional, Cormany, C., additional, Liao, M., additional, Mitchell, N., additional, Schild, T., additional, Barden, R., additional, Everitt, D., additional, Freudenberg, K., additional, Guilliams, V., additional, Hughes, D., additional, Martovetsky, N., additional, Rossano, G., additional, Vandergriff, D., additional, Wooley, K., additional, Khumthong, K., additional, Norausky, N., additional, Ortiz, E., additional, Sheeron, J., additional, and Smith, J., additional

Published
2024
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3. Influence of heat treatment excursion on critical current and residual resistivity ratio of ITER Nb3Sn strands

Author

Lu, J., McGuire, D. R., Hill, S., Niu, R., Chan, K., and Martovetsky, N. N.

Subjects
Condensed Matter - Superconductivity
Abstract

Heat treatment is critically important to the performance of Nb3Sn superconducting strands. For very large Nb3Sn magnet coils, such as the International Thermonuclear Experimental Reactor (ITER) Central Solenoid (CS) coils, heat treatment carries risk of temperature and time excursion, which may result in performance degradation. Therefore, it is prudent to study the effect of possible excursion on Nb3Sn performance. In this study, Nb3Sn strands used for ITER CS coils are heat treated at different temperatures for different times. Their critical current, residual resistance ratio and hysteresis losses are measured. It is found that in the range we studied, critical current and hysteresis losses do not change significantly. Residual resistance ratio, however, decreases with increasing heat treatment temperature and time. This is attributed to the diffusion of metallic elements from the plated Cr layer to the copper stabilizer. Based on a model of metallic elements diffusion, a numerical code is developed to predict residual resistance ratio as a function of heat treatment temperature and time., Comment: 9 figures

Published
2017
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4. From manufacture to assembly of the ITER central solenoid

Author

Libeyre, P., Schild, T., Bruton, A., Cormany, C., Dolgetta, N., Gaxiola, E., Jong, C., Mitchell, N., Evans, D., Levesy, B., Bedakihale, V., Garcia Sanchez, P., Mariani, A., Okugawa, R., Reiersen, W., Martovetsky, N., Everitt, D., Hughes, D., Reagan, T., Freudenberg, K., Hatfield, D., Chae, T., Vandergriff, D., Sgobba, S., Aviles, I., Decool, P., Vallet, J.C., and Nunio, F.

Published
2019
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6. Progress of ITER Central Solenoid Assembly

Author

Cormany, C., Bruton, A., Liao, M., Mitchell, N., Miyoshi, Y., Schild, T., Everitt, D., Freudenberg, K., Guilliams, V., Istomin, A., Rathbun, J., Martovetsky, N., Vandergriff, D., Wooley, K., Brun, C., Decool, P., Dao, C. Nguyen Thanh, Che, T., Jiang, T., Shao, L., Zhu, H., Potts, R., Norausky, N, and Smith, J.

Abstract

This paper describes critical assembly process qualifications, acceptance criteria, and worker training of ITER Central Solenoid Assembly. Coaxial joint assembly was qualified and trained to achieve resistance below 4.1 nOhm. The electrical insulation process was qualified to 30 kV and 15 kV under Paschen conditions. Shear pin drilling and installation within specified tolerance was achieved. Modules were lifted and positioned within 2 mm. The lessons learned, and subsequent work execution onsite within the IO facility assembly hall are also presented.

Published
2024
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9. Coupling and Hysteresis Loss Measurements on the ITER CS Module #4

Author

Breschi, M., Cavallucci, L., Bauer, P., Vostner, A., Bonifetto, R., Zappatore, A., Zanino, R., and Martovetsky, N.

Abstract

The fourth CS Module (CSM#4) of the ITER Central Solenoid was tested in November/December 2022 at the premises of General Atomics, Poway, US. During the measurement campaign, the CSM#4 was submitted to dumps of the transport current from different initial values (from 0 to 40 kA) to 0 kA. The tests were performed both in virgin conditions and after 10 slow current cycles. This work analyses the experimental dumps of the CSM#4 to determine the losses in the CICC via the measurement of the energy deposited in the supercritical helium. The losses in the magnet are presented pointing out the impact of the slow current cycles. The latter also allow one measuring the hysteresis losses of the magnet. In the previous module tests, as well as in the tests of a single layer solenoid (referred to as CS Insert), it was very difficult to retrieve reliable values of the hysteresis losses in the CS conductor. However, the knowledge of hysteresis losses is crucial for a correct heat inventory of the magnet in operation. This study reports the results of their measurement, which represents a relevant added value of the CSM#4 tests. Finally, the experimental data are compared with the results of analytical models developed for the loss computation.

Published
2024
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10. Start of the ITER Central Solenoid Assembly

Author

Schild, T., primary, Bruton, A., additional, Cormany, C., additional, Gauthier, F., additional, Jong, C., additional, Liao, M., additional, Mitchell, N., additional, Mariani, A., additional, Miyoshi, Y., additional, Martovetsky, N., additional, Everitt, D., additional, Freudenberg, K., additional, Vandergriff, D., additional, Hughes, D., additional, Rossano, G., additional, Smith, J., additional, Potts, R., additional, Stephens, A., additional, Decool, P., additional, and Nguyen Thanh Dao, C., additional

Published
2022
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11. AC Losses in the Second Module of the ITER Central Solenoid

Author

Breschi, M., primary, Cavallucci, L., additional, Bauer, P., additional, Gauthier, F., additional, Bonifetto, R., additional, Zappatore, A., additional, Zanino, R., additional, Martovetsky, N., additional, Khumthong, K., additional, Ortiz, E., additional, and Sheeron, J., additional

Published
2022
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14. Overview of verification tests on AC loss, contact resistance and mechanical properties of ITER conductors with transverse loading up to 30 000 cycles

Author

Yagotintsev, K A, primary, Wessel, W A J, additional, Vostner, A, additional, Devred, A, additional, Bessette, D, additional, Mitchell, N, additional, Nabara, Y, additional, Boutboul, T, additional, Tronza, V, additional, Park, S-H, additional, Yu, W, additional, Martovetsky, N, additional, and Nijhuis, A, additional

Published
2019
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16. Electrical insulation testing for ITER fusion tokamak

Author

Gaxiola, E., primary, Evans, D., additional, Laquiere, J., additional, Laurenti, A., additional, Libeyre, P., additional, Lyraud, C., additional, Piccin, R., additional, Rinaudo, G., additional, Simon, F., additional, Vollmann, T., additional, Martovetsky, N., additional, Niu, E., additional, Langeslag, S., additional, Sgobba, S., additional, Khumthong, K., additional, Norausky, N., additional, Smith, J., additional, Wei, J., additional, Wu, H., additional, and Yu, X., additional

Published
2017
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18. Starting Manufacture of the ITER Central Solenoid

Author

Libeyre, P., primary, Cormany, C., additional, Dolgetta, N., additional, Gaxiola, E., additional, Jong, C., additional, Lyraud, C., additional, Mitchell, N., additional, Journeaux, J. Y., additional, Vollmann, T., additional, Evans, D., additional, Sgobba, S., additional, Langeslag, S., additional, Reiersen, W., additional, Martovetsky, N., additional, Everitt, D., additional, Hatfield, D., additional, Rosenblad, P., additional, Litherland, S., additional, Freudenberg, K., additional, Myatt, L., additional, Smith, J., additional, Brazelton, C., additional, Abbott, R., additional, Daubert, J., additional, Rackers, K., additional, and Nentwich, T., additional

Published
2016
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19. Manufacture and Quality Control of Insert Coil with Real ITER TF Conductor

Author

Ozeki, H., primary, Isono, T., additional, Uno, Y., additional, Kawano, K., additional, Kawasaki, T., additional, Ebisawa, N., additional, Okuno, K., additional, Kido, S., additional, Semba, T., additional, Suzuki, Y., additional, Ichimura, T., additional, Inoue, S., additional, Kuchiishi, Y., additional, Hasegawa, H., additional, Smirnov, A., additional, and Martovetsky, N., additional

Published
2016
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21. Fabrication Process Qualification of TF Insert Coil Using Real ITER TF Conductor

Author

Ozeki, H., primary, Isono, T., additional, Kawano, K., additional, Saito, T., additional, Kawasaki, T., additional, Nishino, K., additional, Okuno, K., additional, Kido, S., additional, Semba, T., additional, Suzuki, Y., additional, Ichimura, T., additional, Inoue, S., additional, Kuchiishi, Y., additional, Hasegawa, H., additional, Smirnov, A., additional, and Martovetsky, N., additional

Published
2015
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22. Status of design and manufacturing of the ITER Central Solenoid and Correction Coils

Author

Libeyre, P., primary, Rosenblad, P., additional, Cole, M., additional, Freudenberg, K., additional, Liu, Sheng, additional, Smith, J., additional, Wei, Jing, additional, Wang, Lin, additional, Yu, Xiaowu, additional, Dong, Xiaoyu, additional, Xin, Jijun, additional, Cormany, C., additional, Li, Chao, additional, Zheng, Wangwang, additional, Fang, Chao, additional, Dolgetta, N., additional, Gaxiola, E., additional, Jong, C., additional, Lyraud, C., additional, Reiersen, W., additional, Everitt, D., additional, and Martovetsky, N., additional

Published
2015
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26. AC Losses in the First ITER CS Module Tests: Experimental Results and Comparison to Analytical Models

Author

P. Bauer, Florent Gauthier, Andrea Zappatore, Marco Breschi, Lorenzo Cavallucci, Nicolai Martovetsky, Roberto Zanino, Pier Luigi Ribani, Roberto Bonifetto, Breschi M., Cavallucci L., Ribani P.L., Bonifetto R., Zappatore A., Zanino R., Gauthier F., Bauer P., and Martovetsky N.

Subjects
AC Losses, Cable in Conduit Conductors, Central Solenoid, ITER project, Cable in Conduit Conductor, Materials science, Nuclear engineering, Solenoid, Cryogenics, Superconducting magnet, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, AC Losse, Stack (abstract data type), Electromagnetic coil, Magnet, 0103 physical sciences, Electrical and Electronic Engineering, 010306 general physics, Electrical conductor, Circuit breaker
Abstract

The ITER Central Solenoid (CS) will be manufactured by assembling a stack of six modules, which are under fabrication by the US ITER organization and its subcontractors. The tests of the first CS Module have been performed at the premises of the General Atomics (GA) facility in Poway (US), in order to check compliance to the ITER requirements. Among other tests, the magnet was submitted to exponential dumps of the transport current from different initial values (10, 15, 20, 22.5, 25, 35, 40 kA) down to 0 kA. These tests are aimed at conducting DC breaker commissioning of the test facility and were used to measure the AC losses in the coil during electrodynamic transients. This paper presents the results of these measurements, along with a comparison with analytical computations of the losses in the magnet.

Published
2021

27. Modeling the ITER CS AC Losses Based on the CS Insert Analysis

Author

Marco Breschi, Roberto Bonifetto, Nicolai Martovetsky, Alberto Brighenti, Roberto Zanino, Laura Savoldi, Marco Bianchi, Bonifetto R., Bianchi M., Breschi M., Brighenti A., Martovetsky N., Savoldi L., and Zanino R.

Subjects
Materials science, Nuclear engineering, fusion magnets, Solenoid, thermal-hydraulic, ITER CS, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Thermal hydraulics, cable in conduit conductors, ITER, 0103 physical sciences, Mass flow rate, thermal-hydraulics, Electrical and Electronic Engineering, 010306 general physics, Multiphysics modeling, cable in conduit conductor, Coupling, Insert (composites), fusion magnet, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Conductor, Coolant, AC loss modeling, Electromagnetic coil
Abstract

The cable-in-conduit conductor that will be used for the manufacturing of the ITER central solenoid (CS) modules has undergone a long series of qualification tests: the latest was performed in 2015 at QST, Naka, Japan, on the central solenoid insert (CSI) coil. In this work, the AC losses dataset collected during the CSI test campaign is interpreted using a lumped-parameter model for the coupling and hysteresis losses. The model is first benchmarked against the results of the THELMA code and then, after the implementation in the 4C thermal-hydraulic code, successfully validated against experimental data from tests performed on the CSI. With the validated AC loss model, the predictive analysis of the performance of the ITER CS is then carried out using again the 4C code, both in nominal conditions and with a reduced coolant mass flow rate in the most loaded pancake; it is shown that the minimum temperature margin required by the design is always satisfied, for both virgin (1 K) and cycled (1.5 K) conductor.

Published
2019

28. Characterization of the ITER CS conductor and projection to the ITER CS performance

Author

Roberto Bonifetto, Yoshihiro Nabara, Roberto Zanino, Denis Bessette, Marco Breschi, Nicolai Martovetsky, Arnaud Devred, Pierluigi Bruzzone, Takaaki Isono, L. Zani, Laura Savoldi, Martovetsky, N., Isono, T., Bessette, D., Devred, A., Nabara, Y., Zanino, R., Savoldi, L., Bonifetto, R., Bruzzone, P., Breschi, M., and Zani, L.

Subjects
Nuclear engineering, Performance, Strain measurement, Solenoid, Superconducting magnet, 01 natural sciences, 010305 fluids & plasmas, Degradation, Nuclear magnetic resonance, 0103 physical sciences, Superconducting magnets, General Materials Science, 010306 general physics, Projection (set theory), Civil and Structural Engineering, Physics, Mechanical Engineering, Superconducting magnets, Voltage measurement, Strain measurement, Degradation, Performance, Voltage measurement, Characterization (materials science), Conductor, Nuclear Energy and Engineering, Electromagnetic coil, Materials Science (all)
Abstract

The ITER Central Solenoid (CS) is one of the critical elements of the machine. The CS conductor went through an intense optimization and qualification program, which included characterization of the strands, a conductor straight short sample testing in the SULTAN facility at the Swiss Plasma Center (SPC), Villigen, Switzerland, and a single-layer CS Insert coil recently tested in the Central Solenoid Model Coil (CSMC) facility in QST-Naka, Japan. We obtained valuable data in a wide range of the parameters (current, magnetic field, temperature, and strain), which allowed a credible characterization of the CS conductor in different conditions. Using this characterization, we will make a projection to the performance of the CS in the ITER reference scenario.

Published
2017

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