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Title: Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system

Abstract

A new frequency-modulated (FMCW) profile reflectometer system, featuring a monostatic antenna geometry (using one microwave antenna for both launch and receive), has been installed on the DIII-D tokamak, providing a first experimental test of this measurement approach for profile reflectometry. Significant features of the new system are briefly described in this paper, including the new monostatic arrangement, use of overmoded, broadband transmission waveguide, and dual-polarization combination/demultiplexing. Updated data processing and analysis, and in-service performance aspects of the new monostatic profile reflectometer system are also presented. By using a raytracing code (GENRAY) to determine the approximate trajectory of the probe beam, the electron density (ne) profile can be successfully reconstructed with L-mode plasmas vertically shifted by more than 10 cm off the vessel midplane. Specifically, it is demonstrated that the new system has a capability to measure ne profiles with plasma vertical offsets of up to ±17 cm. Furthermore, examples are also presented of accurate, high time and spatial resolution density profile measurements made over a wide range of DIII-D conditions, e.g. the measured temporal evolution of the density profile across an L-H transition.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1352931
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Zeng, Lei, Peebles, William A., Doyle, Edward J., Rhodes, Terry L., Crocker, Neal, Nguyen, X., Wannberg, Craig W., and Wang, Guiding. Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system. United States: N. p., 2014. Web. doi:10.1063/1.4889775.
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Zeng, Lei, Peebles, William A., Doyle, Edward J., Rhodes, Terry L., Crocker, Neal, Nguyen, X., Wannberg, Craig W., & Wang, Guiding. Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system. United States. https://doi.org/10.1063/1.4889775
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Zeng, Lei, Peebles, William A., Doyle, Edward J., Rhodes, Terry L., Crocker, Neal, Nguyen, X., Wannberg, Craig W., and Wang, Guiding. Thu . "Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system". United States. https://doi.org/10.1063/1.4889775. https://www.osti.gov/servlets/purl/1352931.
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@article{osti_1352931,
title = {Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system},
author = {Zeng, Lei and Peebles, William A. and Doyle, Edward J. and Rhodes, Terry L. and Crocker, Neal and Nguyen, X. and Wannberg, Craig W. and Wang, Guiding},
abstractNote = {A new frequency-modulated (FMCW) profile reflectometer system, featuring a monostatic antenna geometry (using one microwave antenna for both launch and receive), has been installed on the DIII-D tokamak, providing a first experimental test of this measurement approach for profile reflectometry. Significant features of the new system are briefly described in this paper, including the new monostatic arrangement, use of overmoded, broadband transmission waveguide, and dual-polarization combination/demultiplexing. Updated data processing and analysis, and in-service performance aspects of the new monostatic profile reflectometer system are also presented. By using a raytracing code (GENRAY) to determine the approximate trajectory of the probe beam, the electron density (ne) profile can be successfully reconstructed with L-mode plasmas vertically shifted by more than 10 cm off the vessel midplane. Specifically, it is demonstrated that the new system has a capability to measure ne profiles with plasma vertical offsets of up to ±17 cm. Furthermore, examples are also presented of accurate, high time and spatial resolution density profile measurements made over a wide range of DIII-D conditions, e.g. the measured temporal evolution of the density profile across an L-H transition.},
doi = {10.1063/1.4889775},
journal = {Review of Scientific Instruments},
number = 11,
volume = 85,
place = {United States},
year = {Thu Aug 07 00:00:00 EDT 2014},
month = {Thu Aug 07 00:00:00 EDT 2014}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.4889775
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Cited by: 16 works
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Works referenced in this record:

Role of Zonal Flow Predator-Prey Oscillations in Triggering the Transition to H-Mode Confinement
journal, April 2012

Initial results of high resolution L–H transition studies on DIII-D
journal, April 2004

Changes in particle transport as a result of resonant magnetic perturbations in DIII-D
journal, May 2012

  • Mordijck, S.; Doyle, E. J.; McKee, G. R.
  • Physics of Plasmas, Vol. 19, Issue 5
  • DOI: 10.1063/1.4718316

SOL and pedestal density profile evolution during DIII-D ELMy and ELM-suppressed H-mode operation
journal, March 2005

Dynamics of pedestal perturbations by ELMs and edge harmonic oscillations in DIII-D
journal, April 2004

Implementation of reflectometry as a standard density profile diagnostic on DIII-D
journal, January 2001

  • Zeng, L.; Doyle, E. J.; Luce, T. C.
  • Review of Scientific Instruments, Vol. 72, Issue 1
  • DOI: 10.1063/1.1319607

Optimization studies of the ITER low field side reflectometer
journal, October 2010

  • Diem, S. J.; Wilgen, J. B.; Bigelow, T. S.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3490026

Analysis of the ITER low field side reflectometer transmission line system
journal, October 2010

  • Hanson, G. R.; Wilgen, J. B.; Bigelow, T. S.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3485086

High-resolution dual-polarization frequency modulated reflectometer density profile measurements on DIII-D
journal, October 2004

  • Wang, G.; Doyle, E. J.; Peebles, W. A.
  • Review of Scientific Instruments, Vol. 75, Issue 10
  • DOI: 10.1063/1.1788849

Advances in reflectometric density profile measurements on the DIII‐D tokamak a)
journal, February 1995

  • Kim, K. W.; Doyle, E. J.; Peebles, W. A.
  • Review of Scientific Instruments, Vol. 66, Issue 2
  • DOI: 10.1063/1.1146012

Tests of causality: Experimental evidence that sheared E×B flow alters turbulence and transport in tokamaks
journal, December 1999

Novel mono-static arrangement of the ASDEX Upgrade high field side reflectometers compatible with electron cyclotron resonance heating stray radiation
journal, October 2012

  • Silva, A.; Varela, P.; Meneses, L.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4732804
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    Works referencing / citing this record:

    2D imaging of helium ion velocity in the DIII-D divertor
    journal, May 2018

    • Samuell, C. M.; Porter, G. D.; Meyer, W. H.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5017999

    A free-standing wire scattering technique to monitor calibration variations of the DIII-D density profile reflectometer
    journal, October 2018

    • Zeng, L.; Wang, G.; Rhodes, T. L.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5036581

    L – H transition trigger physics in ITER-similar plasmas with applied n   =  3 magnetic perturbations
    journal, September 2019

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