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

Zeng, Lei; Peebles, William A.; Doyle, Edward J.; Rhodes, Terry L.; Crocker, Neal; Nguyen, X.; Wannberg, Craig W.; Wang, Guiding

doi:10.1063/1.4889775

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

Journal Article · Thu Aug 07 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4889775· OSTI ID:1352931

Zeng, Lei ^[1]; Peebles, William A. ^[1]; Doyle, Edward J. ^[1]; Rhodes, Terry L. ^[1]; Crocker, Neal ^[1]; Nguyen, X. ^[1]; Wannberg, Craig W. ^[1]; Wang, Guiding ^[1]

Univ. of California, Los Angeles, CA (United States)

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 (n_e) 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 n_e 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.

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1352931

Journal Information:: Review of Scientific Instruments, Vol. 85, Issue 11; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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References (12)

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Cited By (3)

2D imaging of helium ion velocity in the DIII-D divertor Samuell, C. M.; Porter, G. D.; Meyer, W. H. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017999	journal	May 2018
A free-standing wire scattering technique to monitor calibration variations of the DIII-D density profile reflectometer Zeng, L.; Wang, G.; Rhodes, T. L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036581	journal	October 2018
L – H transition trigger physics in ITER-similar plasmas with applied n = 3 magnetic perturbations Schmitz, L.; Kriete, D. M.; Wilcox, R. S. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab36bf	journal	September 2019

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