Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron

Ponce, Dan; Brambila, Rigo E.; Cengher, Mirela; Gorelov, Yuri A.; Grosnickle, William H.; Lohr, John M.; Torrezan, Antonio C.

doi:10.1080/15361055.2017.1387009

Title: Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron

Abstract

The ECH Group at DIII-D has installed in-house engineered, FPGA-based, high voltage reference waveform generators on its gyrotron control systems to enhance the capabilities of the systems and replace obsolete equipment. The new hardware, named D-Wavegen, outputs 16-bit signals every microsecond and can respond to events and anomalies in real-time. These generators have been reliably pausing gyrotron rf output during periods of DIII-D plasma density that exceed the fault density trip level and restarting the rf output if the density falls below the trip level. While tightly monitoring gyrotron body current and internal pressure, D-Wavegen has also been reliably restarting, in a little over 10ms, gyrotrons that spontaneously ceased rf generation.

Authors:

^[1]; Brambila, Rigo E. ^[1]; Cengher, Mirela ^[1]; Gorelov, Yuri A. ^[1]; Grosnickle, William H. ^[1]; Lohr, John M. ^[1]; Torrezan, Antonio C. ^[1]

General Atomics, San Diego, CA (United States)

Publication Date:: Thu Oct 19 00:00:00 EDT 2017

Research Org.:: General Atomics, San Diego, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1411886

Grant/Contract Number:: FC02-04ER54698

Resource Type:: Accepted Manuscript

Journal Name:: Fusion Science and Technology

Additional Journal Information:: Journal Volume: 73; Journal Issue: 1; Journal ID: ISSN 1536-1055

Publisher:: American Nuclear Society

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; gyrotron fault restart; body current fault; gyrotron interlock restart

Citation Formats


                    Ponce, Dan, Brambila, Rigo E., Cengher, Mirela, Gorelov, Yuri A., Grosnickle, William H., Lohr, John M., and Torrezan, Antonio C. Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron.  United States: N. p., 2017. 
Web.  doi:10.1080/15361055.2017.1387009.

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                    Ponce, Dan, Brambila, Rigo E., Cengher, Mirela, Gorelov, Yuri A., Grosnickle, William H., Lohr, John M., & Torrezan, Antonio C. Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron.  United States.  https://doi.org/10.1080/15361055.2017.1387009

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                    Ponce, Dan, Brambila, Rigo E., Cengher, Mirela, Gorelov, Yuri A., Grosnickle, William H., Lohr, John M., and Torrezan, Antonio C. Thu .  
"Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron".  United States.  https://doi.org/10.1080/15361055.2017.1387009.  https://www.osti.gov/servlets/purl/1411886.

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@article{osti_1411886,

  title        = {Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron},

  author       = {Ponce, Dan and Brambila, Rigo E. and Cengher, Mirela and Gorelov, Yuri A. and Grosnickle, William H. and Lohr, John M. and Torrezan, Antonio C.},

  abstractNote = {The ECH Group at DIII-D has installed in-house engineered, FPGA-based, high voltage reference waveform generators on its gyrotron control systems to enhance the capabilities of the systems and replace obsolete equipment. The new hardware, named D-Wavegen, outputs 16-bit signals every microsecond and can respond to events and anomalies in real-time. These generators have been reliably pausing gyrotron rf output during periods of DIII-D plasma density that exceed the fault density trip level and restarting the rf output if the density falls below the trip level. While tightly monitoring gyrotron body current and internal pressure, D-Wavegen has also been reliably restarting, in a little over 10ms, gyrotrons that spontaneously ceased rf generation.},

  doi          = {10.1080/15361055.2017.1387009},

  journal      = {Fusion Science and Technology},

  number       = 1,

  volume       = 73,

  place        = {United States},

  year         = {Thu Oct 19 00:00:00 EDT 2017},

  month        = {Thu Oct 19 00:00:00 EDT 2017}

}

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Works referenced in this record:

The Multiple Gyrotron System on the DIII-D Tokamak
journal, August 2015

Lohr, J.; Anderson, J.; Brambila, R.
Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 37, Issue 1
DOI: 10.1007/s10762-015-0201-5

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Title: Interrupting an Imminent Body Current Fault and Restoring Full Power in Milliseconds on a DIII-D National Fusion Facility Gyrotron

Abstract

Citation Formats

The Multiple Gyrotron System on the DIII-D Tokamak journal, August 2015

The Multiple Gyrotron System on the DIII-D Tokamak
journal, August 2015