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Measurement and Processing of Fast Pulsed Discharge Current in Plasma Focus Machines

The fast pulsed electric discharge current drives all physical processes in the plasma focus device; in turn all physical processes in the focus affect the current waveform. Thus the discharge current waveform is the most important indicator of plasma focus performance. This underlies the importance...

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Published in:Journal of fusion energy 2012-04, Vol.31 (2), p.198-204
Main Authors: Lee, S., Saw, S. H., Rawat, R. S., Lee, P., Verma, R., Talebitaher, A., Hassan, S. M., Abdou, A. E., Ismail, Mohamed, Mohamed, Amgad, Torreblanca, H., Al Hawat, Sh, Akel, M., Chong, P. L., Roy, F., Singh, A., Wong, D., Devi, K.
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cited_by cdi_FETCH-LOGICAL-c385t-83f14df59f409a40ff37252fa9a8b8583e2004129ccf09a3612a31c5400b48c03
cites cdi_FETCH-LOGICAL-c385t-83f14df59f409a40ff37252fa9a8b8583e2004129ccf09a3612a31c5400b48c03
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container_issue 2
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container_title Journal of fusion energy
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creator Lee, S.
Saw, S. H.
Rawat, R. S.
Lee, P.
Verma, R.
Talebitaher, A.
Hassan, S. M.
Abdou, A. E.
Ismail, Mohamed
Mohamed, Amgad
Torreblanca, H.
Al Hawat, Sh
Akel, M.
Chong, P. L.
Roy, F.
Singh, A.
Wong, D.
Devi, K.
description The fast pulsed electric discharge current drives all physical processes in the plasma focus device; in turn all physical processes in the focus affect the current waveform. Thus the discharge current waveform is the most important indicator of plasma focus performance. This underlies the importance of properly measuring, processing and interpreting the discharge current waveform. This paper reports the measurement of fast pulsed discharge current by the Rogowski coil, in two different modes: the current transformer, “I” mode, and current derivative, “Idot” mode. The processing and interpretation of recorded current waveform to obtain useful information about the physical processes in the plasma focus device are discussed. The current transformer with a large number of turns and a sub-1 Ohm terminator has good high frequency response, necessary for the sharp current dip region when dI / dt exceeds 2 × 10 11  A/s. However the signal is “noisy” in the current dip region. Several methods to extract the current dip from the noise are discussed and examples of how low pass filters affect the signals are shown. The dI / dt coil, the Rogowski coil in “Idot” mode, with a few turns terminated by 50-Ohm is also described. Integrating the 1 GSa/s digital waveform does remove the high frequency noise components, yet the extracted waveform shows sharp angular features indicative of the retention of short-time features. This makes the dI / dt coil superior to the current transformer. A 7-turn coil is tested against the Lee Model code and found to be suitable to measure the plasma focus discharge current.
doi_str_mv 10.1007/s10894-011-9456-6
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H. ; Rawat, R. S. ; Lee, P. ; Verma, R. ; Talebitaher, A. ; Hassan, S. M. ; Abdou, A. E. ; Ismail, Mohamed ; Mohamed, Amgad ; Torreblanca, H. ; Al Hawat, Sh ; Akel, M. ; Chong, P. L. ; Roy, F. ; Singh, A. ; Wong, D. ; Devi, K.</creator><creatorcontrib>Lee, S. ; Saw, S. H. ; Rawat, R. S. ; Lee, P. ; Verma, R. ; Talebitaher, A. ; Hassan, S. M. ; Abdou, A. E. ; Ismail, Mohamed ; Mohamed, Amgad ; Torreblanca, H. ; Al Hawat, Sh ; Akel, M. ; Chong, P. L. ; Roy, F. ; Singh, A. ; Wong, D. ; Devi, K.</creatorcontrib><description>The fast pulsed electric discharge current drives all physical processes in the plasma focus device; in turn all physical processes in the focus affect the current waveform. Thus the discharge current waveform is the most important indicator of plasma focus performance. This underlies the importance of properly measuring, processing and interpreting the discharge current waveform. 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The dI / dt coil, the Rogowski coil in “Idot” mode, with a few turns terminated by 50-Ohm is also described. Integrating the 1 GSa/s digital waveform does remove the high frequency noise components, yet the extracted waveform shows sharp angular features indicative of the retention of short-time features. This makes the dI / dt coil superior to the current transformer. A 7-turn coil is tested against the Lee Model code and found to be suitable to measure the plasma focus discharge current.</abstract><cop>Boston</cop><pub>Springer US</pub><doi>10.1007/s10894-011-9456-6</doi><tpages>7</tpages></addata></record>
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source Springer Nature
subjects Applied sciences
Coils
Controled nuclear fusion plants
Electric discharges
Electric filters
Electrodes
Electrons
Energy
Energy Systems
Energy. Thermal use of fuels
Exact sciences and technology
Focus devices
Frequency response
Geometry
High frequencies
Installations for energy generation and conversion: thermal and electrical energy
Low pass filters
Measurement
Neutrons
Nuclear Energy
Nuclear Fusion
Original Research
Physics
Physics and Astronomy
Plasma
Plasma focus
Plasma Physics
Radiation
Sustainable Development
Transformers
Waveforms
title Measurement and Processing of Fast Pulsed Discharge Current in Plasma Focus Machines
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