ECRH/EBWH SYSTEM FOR NSTX-

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The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at an axial toroidal field of up to 1 T, about twice the field available on NSTX. A 28 GHz electron cylotron resonance heating (ECRH) system is currently being planned for NSTX-U. A 1 MW 28 GHz gyrotron will be employed. Intially the system will use short, 10-50 ms, 1 MW pulses for ECRH-assisted discharge start-up. Later the pulse length will be extended to 1-5 s to study electron Bernstein wave heating (EBWH) during the plasma current flat top. A mirror launcher will be used to couple microwave power to the ... continued below

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Taylor, G.; Ellis, R. A.; Harvey, R. W.; Hosea, J. C. & Smirnov, A. P. June 15, 2012.

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Description

The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at an axial toroidal field of up to 1 T, about twice the field available on NSTX. A 28 GHz electron cylotron resonance heating (ECRH) system is currently being planned for NSTX-U. A 1 MW 28 GHz gyrotron will be employed. Intially the system will use short, 10-50 ms, 1 MW pulses for ECRH-assisted discharge start-up. Later the pulse length will be extended to 1-5 s to study electron Bernstein wave heating (EBWH) during the plasma current flat top. A mirror launcher will be used to couple microwave power to the plasma via O-mode to the slow X-mode to EBW (O-X-B) double mode conversion. This paper presents a pre-conceptual design for the ECRH/EBWH system proposed for NSTX-U and includes ray tracing and Fokker-Planck modeling results for 28 GHz ECRH during plasma start-up and EBW heating and current drive during the plasma current flattop of a NSTX-U advanced H-mode plasma scenario.

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  • Nuclear Fusion (June 2012)

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  • Report No.: PPPL-4768
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1062542
  • Archival Resource Key: ark:/67531/metadc836503

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  • June 15, 2012

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  • May 19, 2016, 9:45 a.m.

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  • July 18, 2016, 5:32 p.m.

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Taylor, G.; Ellis, R. A.; Harvey, R. W.; Hosea, J. C. & Smirnov, A. P. ECRH/EBWH SYSTEM FOR NSTX-, report, June 15, 2012; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc836503/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.