First results with amplitude modulation reflectometry on the PBX-M tokamak

E. De La Luna; J. Sanchez; V. Zhuravlev; I. García-Cortés; G. R. Hanson; J. B. Wilgen; J. H. Harris; J. Dunlap; R. Kaita; B. Leblanc; G. R. Tynan; L. Schmitz; L. Blush

doi:10.1063/1.1146540

First results with amplitude modulation reflectometry on the PBX-M tokamak

E. De La Luna, J. Sanchez, V. Zhuravlev, I. García-Cortés, G. R. Hanson, J. B. Wilgen, J. H. Harris, J. Dunlap, R. Kaita, B. Leblanc, G. R. Tynan, L. Schmitz, L. Blush

Power Exhaust and Particle Control

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Abstract

Electron density profile measurements have been obtained on PBX-M by amplitude modulation reflectometry. With this technique, the measurement of the time delay is obtained from the phase delay of the modulating envelope (200 MHz in PBX-M). The system operates with the extraordinary mode, in the range 32-50 GHz. Under these conditions the density profile of PBX-M can be probed from the scrape-off layer up to typically r/a=0.7. With a final bandwidth of 40 kHz, the reflectometer is able to obtain the edge profile in 1 ms. The profiles obtained are relatively noise free and in good agreement with Thomson scattering measurements. Perturbations due to the strong-edge turbulence are kept to a minimum, and no software filtering or other signal processing was necessary to extract the time delay information from the raw data. Profiles have been measured for ohmic and Neutron Beam Injection heated discharges.

Original language	English
Pages (from-to)	403-405
Number of pages	3
Journal	Review of Scientific Instruments
Volume	66
Issue number	1
DOIs	https://doi.org/10.1063/1.1146540
State	Published - 1995

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@article{b492eddbed9f4ab39e678f29d0e42783,

title = "First results with amplitude modulation reflectometry on the PBX-M tokamak",

abstract = "Electron density profile measurements have been obtained on PBX-M by amplitude modulation reflectometry. With this technique, the measurement of the time delay is obtained from the phase delay of the modulating envelope (200 MHz in PBX-M). The system operates with the extraordinary mode, in the range 32-50 GHz. Under these conditions the density profile of PBX-M can be probed from the scrape-off layer up to typically r/a=0.7. With a final bandwidth of 40 kHz, the reflectometer is able to obtain the edge profile in 1 ms. The profiles obtained are relatively noise free and in good agreement with Thomson scattering measurements. Perturbations due to the strong-edge turbulence are kept to a minimum, and no software filtering or other signal processing was necessary to extract the time delay information from the raw data. Profiles have been measured for ohmic and Neutron Beam Injection heated discharges.",

author = "{De La Luna}, E. and J. Sanchez and V. Zhuravlev and I. Garc{\'i}a-Cort{\'e}s and Hanson, {G. R.} and Wilgen, {J. B.} and Harris, {J. H.} and J. Dunlap and R. Kaita and B. Leblanc and Tynan, {G. R.} and L. Schmitz and L. Blush",

year = "1995",

doi = "10.1063/1.1146540",

language = "English",

volume = "66",

pages = "403--405",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

number = "1",

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TY - JOUR

T1 - First results with amplitude modulation reflectometry on the PBX-M tokamak

AU - De La Luna, E.

AU - Sanchez, J.

AU - Zhuravlev, V.

AU - García-Cortés, I.

AU - Hanson, G. R.

AU - Wilgen, J. B.

AU - Harris, J. H.

AU - Dunlap, J.

AU - Kaita, R.

AU - Leblanc, B.

AU - Tynan, G. R.

AU - Schmitz, L.

AU - Blush, L.

PY - 1995

Y1 - 1995

N2 - Electron density profile measurements have been obtained on PBX-M by amplitude modulation reflectometry. With this technique, the measurement of the time delay is obtained from the phase delay of the modulating envelope (200 MHz in PBX-M). The system operates with the extraordinary mode, in the range 32-50 GHz. Under these conditions the density profile of PBX-M can be probed from the scrape-off layer up to typically r/a=0.7. With a final bandwidth of 40 kHz, the reflectometer is able to obtain the edge profile in 1 ms. The profiles obtained are relatively noise free and in good agreement with Thomson scattering measurements. Perturbations due to the strong-edge turbulence are kept to a minimum, and no software filtering or other signal processing was necessary to extract the time delay information from the raw data. Profiles have been measured for ohmic and Neutron Beam Injection heated discharges.

AB - Electron density profile measurements have been obtained on PBX-M by amplitude modulation reflectometry. With this technique, the measurement of the time delay is obtained from the phase delay of the modulating envelope (200 MHz in PBX-M). The system operates with the extraordinary mode, in the range 32-50 GHz. Under these conditions the density profile of PBX-M can be probed from the scrape-off layer up to typically r/a=0.7. With a final bandwidth of 40 kHz, the reflectometer is able to obtain the edge profile in 1 ms. The profiles obtained are relatively noise free and in good agreement with Thomson scattering measurements. Perturbations due to the strong-edge turbulence are kept to a minimum, and no software filtering or other signal processing was necessary to extract the time delay information from the raw data. Profiles have been measured for ohmic and Neutron Beam Injection heated discharges.

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U2 - 10.1063/1.1146540

DO - 10.1063/1.1146540

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VL - 66

SP - 403

EP - 405

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1

ER -

First results with amplitude modulation reflectometry on the PBX-M tokamak

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