DATA ACQUISITION AND PROTECTION FOR NEW DII-D IN-VESSEL COILS

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OAK-B135 The installation of new internal magnetic coils (I-Coils) in the DIII-D tokamak at General Atomics required extensive additions to the experiment data acquisition and protection capabilities. This set of 12 coils (up to 7 kA each) is designed to allow improved feedback stabilization of resistive wall modes which limit the plasma performance. The acquisition and signal conditions needs of the I-Coil power system presented an opportunity to try a new data acquisition approach which increased both the sampling rate and sample size per channel compared to the standard DIII-D CAMAC acquisition equipment. A 96 channel Compact-PCI (cPCI) digitizer system ... continued below

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7 pages

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Campbell, G. L.; Szymanski, D. D.; Piglowski, D. A.; Kellman, D. H.; Anderson, P. M.; Jackson, G. L. et al. October 2003.

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Description

OAK-B135 The installation of new internal magnetic coils (I-Coils) in the DIII-D tokamak at General Atomics required extensive additions to the experiment data acquisition and protection capabilities. This set of 12 coils (up to 7 kA each) is designed to allow improved feedback stabilization of resistive wall modes which limit the plasma performance. The acquisition and signal conditions needs of the I-Coil power system presented an opportunity to try a new data acquisition approach which increased both the sampling rate and sample size per channel compared to the standard DIII-D CAMAC acquisition equipment. A 96 channel Compact-PCI (cPCI) digitizer system was purchased for the I-Coil project to acquire up to approximately 380 MB of power supply and coil current data per plasma discharge. Additional instrumentation and control was provided to protect personnel, the new coils, the tokamak, the facility and improve machine availability. This paper will present discussions of technical and programmatic requirements, based for requirements, the design selection outcome, installation experience, integration issues, commissioning experience, and lessons learned. The data acquisition system is described in detail including a conservative signal isolation scheme, signal grounding standards, anti-aliasing filters, and synchronization of acquisition. Protection interlocks are described, including high voltage isolation, water flow measurement, and the coil grounding-shorting switches.

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7 pages

Notes

OSTI as DE00823600

Source

  • 20th IEEE/NPSS SYMPOSIUM ON FUSION ENGINEERING, SAN DIEGO, CA (US), 10/14/2003--10/17/2003; Other Information: TO BE PUBLISHED IN FUSION SCIENCE AND TECHNOLOGY

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  • Report No.: GA-A24464
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 823600
  • Archival Resource Key: ark:/67531/metadc779539

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 19, 2016, 12:29 p.m.

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Campbell, G. L.; Szymanski, D. D.; Piglowski, D. A.; Kellman, D. H.; Anderson, P. M.; Jackson, G. L. et al. DATA ACQUISITION AND PROTECTION FOR NEW DII-D IN-VESSEL COILS, article, October 2003; United States. (digital.library.unt.edu/ark:/67531/metadc779539/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.