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...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer US
2012
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| Online Access: | http://eprints.intimal.edu.my/133/ http://eprints.intimal.edu.my/133/1/16_ft.pdf |
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| author | Lee, S. Saw, S. H. Rawat, R. S. Lee, P. Verma, R. Talebitaher, A. Hassan, S. M. Abdou, A. E Mohamed, Ismail Mohamed, Amgad Torreblanca, H. Al Hawat, Sh. Akel, M. Chong, P. L. Roy, F. Arwinder, Singh* Wong, D. Devi, K. |
| author_facet | Lee, S. Saw, S. H. Rawat, R. S. Lee, P. Verma, R. Talebitaher, A. Hassan, S. M. Abdou, A. E Mohamed, Ismail Mohamed, Amgad Torreblanca, H. Al Hawat, Sh. Akel, M. Chong, P. L. Roy, F. Arwinder, Singh* Wong, D. Devi, K. |
| author_sort | Lee, S. |
| building | INTI Institutional Repository |
| collection | Online Access |
| 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 × 1011 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. |
| first_indexed | 2025-11-14T11:50:34Z |
| format | Article |
| id | intimal-133 |
| institution | INTI International University |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:50:34Z |
| publishDate | 2012 |
| publisher | Springer US |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | intimal-1332017-11-22T07:11:48Z http://eprints.intimal.edu.my/133/ Measurement and processing of fast pulsed discharge current in plasma focus machines Lee, S. Saw, S. H. Rawat, R. S. Lee, P. Verma, R. Talebitaher, A. Hassan, S. M. Abdou, A. E Mohamed, Ismail Mohamed, Amgad Torreblanca, H. Al Hawat, Sh. Akel, M. Chong, P. L. Roy, F. Arwinder, Singh* Wong, D. Devi, K. QC Physics 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 × 1011 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. Springer US 2012 Article PeerReviewed text en http://eprints.intimal.edu.my/133/1/16_ft.pdf Lee, S. and Saw, S. H. and Rawat, R. S. and Lee, P. and Verma, R. and Talebitaher, A. and Hassan, S. M. and Abdou, A. E and Mohamed, Ismail and Mohamed, Amgad and Torreblanca, H. and Al Hawat, Sh. and Akel, M. and Chong, P. L. and Roy, F. and Arwinder, Singh* and Wong, D. and Devi, K. (2012) Measurement and processing of fast pulsed discharge current in plasma focus machines. Journal of Fusion Energy, 31 (2). pp. 198-204. ISSN 1572-9591 10.1007/s10894-011-9456-6 |
| spellingShingle | QC Physics Lee, S. Saw, S. H. Rawat, R. S. Lee, P. Verma, R. Talebitaher, A. Hassan, S. M. Abdou, A. E Mohamed, Ismail Mohamed, Amgad Torreblanca, H. Al Hawat, Sh. Akel, M. Chong, P. L. Roy, F. Arwinder, Singh* Wong, D. Devi, K. Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title | Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title_full | Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title_fullStr | Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title_full_unstemmed | Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title_short | Measurement and processing of fast pulsed discharge current in plasma focus machines |
| title_sort | measurement and processing of fast pulsed discharge current in plasma focus machines |
| topic | QC Physics |
| url | http://eprints.intimal.edu.my/133/ http://eprints.intimal.edu.my/133/ http://eprints.intimal.edu.my/133/1/16_ft.pdf |