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Gusarov A, Beaumont P, Siren P. Performance Enhancement of the Polarimetric Fibre Optical Current Sensor at JET Using Polarisation Optimisation. SENSORS (BASEL, SWITZERLAND) 2024; 24:555. [PMID: 38257648 PMCID: PMC10820835 DOI: 10.3390/s24020555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/24/2024]
Abstract
To achieve optimal operation of the polarimetry-based FOCS, the light polarisation state at the input of the sensing fibre part must be close to a linear one. In the case of a FOCS deployed on a tokamak, the Joint European Torus (JET) in the present work, the long fibre optics link between the laser source and the sensing fibre modifies the polarisation in an unpredictable way, making it unclear which source polarisation state is to be set. A method for performing the necessary polarisation adjustment in a systematic way is proposed based on the FOCS analysis. The method requires performing data acquisition at two different input polarisations. Based on these measurements, the optimal laser source polarisation can be found. The method was experimentally verified using laboratory set-up and then successfully demonstrated with the FOCS installed at JET.
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Affiliation(s)
- Andrei Gusarov
- SCK CEN Belgian Nuclear Research Centre, 2400 Mol, Belgium
| | - Perry Beaumont
- The Joint European Torus (JET), Culham Centre for Fusion Energy (CCFE), Culham Science Centre, Abingdon OX14 3EB, UK; (P.B.); (P.S.)
| | - Paula Siren
- The Joint European Torus (JET), Culham Centre for Fusion Energy (CCFE), Culham Science Centre, Abingdon OX14 3EB, UK; (P.B.); (P.S.)
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Wei YQ, Wan BN, Shen B, Yang L, Ji F, Wang Y, Chen M, Liu ZJ. An alternating continuous integration system for magnetic measurements for experimental advanced superconducting tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:115101. [PMID: 37909840 DOI: 10.1063/5.0169108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 10/11/2023] [Indexed: 11/03/2023]
Abstract
Integrators are critical instruments used for magnetic measurement systems (MMSs) in tokamaks, and, currently, the Experimental Advanced Superconducting Tokamak (EAST) has over 600 deployed. However, these integrators, designed with real-time drift compensation, will not be able to support longer pulse operations in the near future due to saturation and drift. To address these issues, this paper proposes a new alternating integration system combining analog integration with drift digital rectification. This system utilizes a microcontroller unit (MCU) to control two parallel analog integrators to work alternatively, compensate their drifts based on their respective error characteristics, and assemble the two integration segments together. The designed architecture provides highly flexible capabilities in operation modes and error correction, which make the system operation and maintenance highly automated. Performance tests on the EAST experiment site show that the prototype integrator can meet the requirements of real-time plasma control for a duration of hour-level.
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Affiliation(s)
- Y Q Wei
- School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China
| | - B N Wan
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - B Shen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - L Yang
- School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China
| | - F Ji
- School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China
| | - Y Wang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - M Chen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Z J Liu
- School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China
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3
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Kim SM, Dandu P, Gusarov A, Danisi A, Vayakis G, Wuilpart M. Assessment of the Structural Vibration Effect on Plasma Current Measurement Using a Fiber Optic Current Sensor in ITER. SENSORS (BASEL, SWITZERLAND) 2023; 23:1460. [PMID: 36772496 PMCID: PMC9921135 DOI: 10.3390/s23031460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/21/2023] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
In this paper, we assess the effect of cryostat bridge vibrations on the plasma current measurement accuracy when using a fiber optic current sensor (FOCS) in ITER. The impact of vibrations on the light polarization state was first experimentally investigated using a miniaturized mock-up which represented a relevant part of the ITER FOCS structure. The set-up was then numerically simulated using the Jones matrix approach. Equivalent vibration matrices obtained from the experiment were used in the simulations to determine the effect of the vibrations on the FOCS accuracy. It is demonstrated that although the vibrations imply some changes in the polarization state, this effect can be strongly reduced when a proper low-birefringent spun optical fiber is used. The ITER requirement regarding the plasma current measurement accuracy can therefore be fulfilled.
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Affiliation(s)
- Sung-Moon Kim
- Department of Electromagnetism & Telecommunications, University of Mons, Boulevard Dolez 31, 7000 Mons, Belgium
| | - Prasadaraju Dandu
- Department of Electromagnetism & Telecommunications, University of Mons, Boulevard Dolez 31, 7000 Mons, Belgium
| | - Andrei Gusarov
- Belgium Nuclear Research Center (SCK-CEN), 2400 Mol, Belgium
| | | | | | - Marc Wuilpart
- Department of Electromagnetism & Telecommunications, University of Mons, Boulevard Dolez 31, 7000 Mons, Belgium
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Leysen W, Gusarov A, Wuilpart M, Beaumont P, Boboc A, Croft D, Bekris N, Batistoni P. Plasma current measurement at JET using polarimetry-based fibre optic current sensor. FUSION ENGINEERING AND DESIGN 2020. [DOI: 10.1016/j.fusengdes.2020.111754] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Marconato N, Cavazzana R, Bettini P, Rigoni A. Accurate Magnetic Sensor System Integrated Design. SENSORS (BASEL, SWITZERLAND) 2020; 20:s20102929. [PMID: 32455732 PMCID: PMC7288339 DOI: 10.3390/s20102929] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/09/2020] [Accepted: 05/09/2020] [Indexed: 06/11/2023]
Abstract
Inductive measurement of magnetic fields is a diagnostic technique widely used in several scientific fields, such as magnetically confined fusion, plasma thrusters and particle accelerators, where real time control and detailed characterization of physics phenomena are required. The accuracy of the measured data strongly influences the machine controllability and the scientific results. In the framework of the assembly modifications of the RFX-mod experiment, a complete renew and improvement of the magnetic diagnostic system, from the probes moved inside the vacuum vessel to the integrator modules, has been carried out. In this paper, the whole system making up the magnetic diagnostics is described, following the acquisition chain from the probe to the streamed data and illustrating the requirements and conflicting limitations which affect the different components, in order to provide a comprehensive overview useful for an integrated design of any new systems. The characterization of a prototypical implementation of the whole acquisition chain is presented, focusing on the flexible ADC architecture adopted for providing a purely numerical signal integration, highlighting the advantages that this technology offers in terms of flexibility, compactness and cost effectiveness, along with the limitations found in existing implementation in terms of ADC noise characteristics and their possible solutions.
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Affiliation(s)
- Nicolò Marconato
- Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; (R.C.); (P.B.); (A.R.)
- Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
| | - Roberto Cavazzana
- Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; (R.C.); (P.B.); (A.R.)
| | - Paolo Bettini
- Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; (R.C.); (P.B.); (A.R.)
- Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
| | - Andrea Rigoni
- Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy; (R.C.); (P.B.); (A.R.)
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7
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Motuz R, Leysen W, Moreau P, Gusarov A, Drexler P, Wuilpart M. Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks. APPLIED OPTICS 2019; 58:2795-2802. [PMID: 31044879 DOI: 10.1364/ao.58.002795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 03/11/2019] [Indexed: 06/09/2023]
Abstract
In this paper, we propose a theoretical study dedicated to the assessment of plasma current measurement in magnetic confinement fusion reactors using a polarization optical time-domain reflectometer (POTDR) setup with a low-birefringence fiber used as the sensing fiber. We consider the general case of a non-uniform magnetic-field distribution along the sensing fiber. The numerical simulations, based on Jones formalism taking into account the OTDR noise, provide the measurement error as a function of the plasma current. The measurement performance is evaluated for an ITER-relevant sensor configuration. We demonstrate that a signal-to-noise ratio of 6 dB, achievable in modern POTDRs, allows us to comply with the ITER requirements for plasma currents from 0 to 1 MA, while for the 1 to 20 MA range, the level is relaxed to 4 dB.
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8
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Status and future developments of R&D on fiber optics current sensor for ITER. FUSION ENGINEERING AND DESIGN 2018. [DOI: 10.1016/j.fusengdes.2018.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Moreau P, Le-Luyer A, Spuig P, Malard P, Saint-Laurent F, Artaud JF, Morales J, Faugeras B, Heumann H, Cantone B, Moreau M, Brun C, Nouailletas R, Nardon E, Santraine B, Berne A, Kumari P, Belsare S. The new magnetic diagnostics in the WEST tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10J109. [PMID: 30399836 DOI: 10.1063/1.5036537] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 05/30/2018] [Indexed: 06/08/2023]
Abstract
The WEST tokamak consists of a major upgrade of the superconducting medium size tokamak Tore Supra aiming at testing ITER divertor components. Such modification has required rebuilding a full set of magnetic diagnostics. The project was started in 2013 and completed in 2016. The diagnostic consists of a set of 469 sensors (421 pick-up coils, 36 flux loops, and 12 Rogowski coils) installed in the WEST vacuum vessel. New analog integrators have been developed in order to obtain the magnetic field and flux from the raw signal of the sensors. During the startup phase of WEST, plasma currents of the order of a few kilo amperes were measured despite much larger current of the order of hundreds of kilo amperes flowing in nearby conducting structures. The diagnostic is now fully operational and exhibits a noise level of about 0.5 mT on the magnetic field, and 2.0 mWb on flux loops allowing identifying the plasma boundary with an accuracy of a few millimeters on a 2 ms time cycle.
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Affiliation(s)
- P Moreau
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - A Le-Luyer
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - P Spuig
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - P Malard
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | | | - J F Artaud
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - J Morales
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - B Faugeras
- Laboratoire J. A. Dieudonne, UMR 7351, Universite Nice Sophia Antipolis, 06108 Nice Cedex 02, France
| | - H Heumann
- Laboratoire J. A. Dieudonne, UMR 7351, Universite Nice Sophia Antipolis, 06108 Nice Cedex 02, France
| | - B Cantone
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - M Moreau
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - C Brun
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | | | - E Nardon
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - B Santraine
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - A Berne
- CEA, IRFM, F-13108 Saint-Paul-Lez-Durance, France
| | - P Kumari
- Institute for Plasma Research (IPR), Near Indira Bridge, Bhat, Gandhinagar 382 428, Gujarat, India
| | - S Belsare
- Institute for Plasma Research (IPR), Near Indira Bridge, Bhat, Gandhinagar 382 428, Gujarat, India
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10
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Testing results of chopper based integrator prototypes for the ITER magnetics. FUSION ENGINEERING AND DESIGN 2018. [DOI: 10.1016/j.fusengdes.2018.01.065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Batista AJ, Capellà L, Neto A, Hall S, Naylor G, Stephen A, Sousa J, Carvalho B, Sartori F, Campagnolo R, Bas I, Gonçalves B, Arshad S, Vayakis G, Simrock S, Zabeo L. F4E prototype of a chopper digital integrator for the ITER magnetics. FUSION ENGINEERING AND DESIGN 2017. [DOI: 10.1016/j.fusengdes.2017.02.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Affiliation(s)
- J. Bucalossi
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
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13
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Gil C, De Michelis C, Elbeze D, Fenzi C, Gunn JP, Imbeaux F, Lotte P, Mazon D, Meyer O, Missirlian M, Moreau P, Reichle R, Sabot R, Saint-Laurent F, Segui JL, Simonin A, Travere JM, Vallet JC. Diagnostic Systems on Tore Supra. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst09-a9175] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- C. Gil
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | | | - D. Elbeze
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - C. Fenzi
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - J. P. Gunn
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - F. Imbeaux
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - Ph. Lotte
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - D. Mazon
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - O. Meyer
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | | | - Ph. Moreau
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - R. Reichle
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - R. Sabot
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | | | - J.-L. Segui
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - A. Simonin
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | | | - J.-C. Vallet
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
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Arshad SA, Cordey JG, McDonald DC, Farthing J, Joffrin E, Hellermann MV, Roach CM, Svensson J. Chapter 11: Data Validation, Analysis, and Applications for Fusion Plasmas. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst08-a1683] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. A. Arshad
- EFDA-CSU, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
- EURATOM0UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - J. G. Cordey
- EURATOM0UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - D. C. McDonald
- EURATOM0UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - J. Farthing
- EURATOM0UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - E. Joffrin
- Association EURATOM0CEA sur la fusion, F-13108 St. Paul Lez Durance, France
| | - M. von Hellermann
- FOM Instituut voor Plasmafysica, EURATOM Association, TEC, Postbus 1207, NL-3430 BE, Nieuwegein, The Netherlands
| | - C. M. Roach
- EURATOM0UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
| | - J. Svensson
- IPP Greifswald, Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, D-17491 Greifswald, Germany
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Strait EJ, Fredrickson ED, Moret JM, Takechi M. Chapter 2: Magnetic Diagnostics. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst08-a1674] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- E. J. Strait
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | | | - J.-M. Moret
- CRPP-EPFL, Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, Switzerland
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Zhang D, Yan X, Zhang E, Pan S. A long time low drift integrator with temperature control. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:105119. [PMID: 27802726 DOI: 10.1063/1.4964806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The output of an operational amplifier always contains signals that could not have been predicted, even with knowledge of the input and an accurately determined closed-loop transfer function. These signals lead to integrator zero-drift over time. A new type of integrator system with a long-term low-drift characteristic has therefore been designed. The integrator system is composed of a temperature control module and an integrator module. The aluminum printed circuit board of the integrator is glued to a thermoelectric cooler to maintain the electronic components at a stable temperature. The integration drift is automatically compensated using an analog-to-digital converter/proportional integration/digital-to-analog converter control circuit. Performance testing in a standard magnet shows that the proposed integrator, which has an integration time constant of 10 ms, has a low integration drift (<5 mV) over 1000 s after repeated measurements. The integrator can be used for magnetic flux measurements in most tokamaks and in the wire rope nondestructive test.
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Affiliation(s)
- Donglai Zhang
- Department of Electrical Engineering and Electronics, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, People's Republic of China
| | - Xiaolan Yan
- Department of Electrical Engineering and Electronics, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, People's Republic of China
| | - Enchao Zhang
- Department of Electrical Engineering and Electronics, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, People's Republic of China
| | - Shimin Pan
- Department of Electrical Engineering and Electronics, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518000, People's Republic of China
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Xu Y, Ji X, Yang Q, Sun T, Yuan B, Liang S, Ren L, Zhou J. Development of a low-drift integrator system on the HL-2A tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:023507. [PMID: 26931849 DOI: 10.1063/1.4940027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, we developed a new integrator system with low-drift and small integration time constant less than 1 ms, which applies to the weak signals from magnetic measurements. This integrator system is designed on the basis of the analog drift compensation and the real-time digital correction of residual drift. The analog drift compensation is achieved by the subtraction between two integrators and the digital correction method is available due to the stability of integral drift in short time scale. The algorithm of the residual drift calculation and correction is implemented by the field programmable gate array. The integral drift can be well compensated within 10 mV/10 s at RC = 0.5 ms and meet the requirements of magnetic diagnostic on HL-2A.
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Affiliation(s)
- Yuan Xu
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Xiaoquan Ji
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Qingwei Yang
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Tengfei Sun
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Baoshan Yuan
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Shaoyong Liang
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Leilei Ren
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
| | - Jian Zhou
- Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
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Neto A, Arshad S, Sartori F, Vayakis G, Ambrosino G, Batista A, Bas I, Campagnolo R, Carvalho B, De Magneval G, De Tommasi G, Dominguez O, Fernandez-Hernando J, Pironti A, Simrock S, Sousa J, Sterle C, Vergara A, Winter A, Zabeo L. Conceptual architecture of the plant system controller for the magnetics diagnostic of the ITER tokamak. FUSION ENGINEERING AND DESIGN 2015. [DOI: 10.1016/j.fusengdes.2015.06.063] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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20
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Moreau P, Saint-Laurent F, Lister J. Drift-free magnetic equilibrium reconstruction using the response to plasma position modulation. FUSION ENGINEERING AND DESIGN 2009. [DOI: 10.1016/j.fusengdes.2009.02.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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21
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Bak JG, Lee SG, Son D, Ga EM. Analog integrator for the Korea superconducting tokamak advanced research magnetic diagnostics. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:043504. [PMID: 17477657 DOI: 10.1063/1.2721405] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
An analog integrator, which automatically compensates an integrating drift, has been developed for the magnetic diagnostics in the Korea superconducting tokamak advanced research (KSTAR). The compensation of the drift is done by the analog to digital converter-register-digital to analog converter in the integrator. The integrator will be used in the equilibrium magnetic field measurements by using inductive magnetic sensors during a plasma discharge in the KSTAR machine. Two differential amplifiers are added to the signal path between each magnetic sensor and the integrator in order to improve the performance of the integrator because a long signal cable of 100 m will be used for the measurement in the KSTAR machine. In this work, the characteristics of the integrator with two differential amplifiers are experimentally investigated.
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Affiliation(s)
- J G Bak
- Research and Development Division, National Fusion Research Center, Daejeon, Korea.
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22
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Real time control of fully non-inductive operation in Tore Supra leading to 6min, 1GJ plasma discharges. FUSION ENGINEERING AND DESIGN 2005. [DOI: 10.1016/j.fusengdes.2005.06.255] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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