Abstract
Amplitude Modulated reflectrometry is presented here as a tool for density profile measurements in the JET divertor plasmas. One of the main problems which has been presented in most reflectometers during the last years is the need for a coherent tracking of the phase delay: fast density fluctuations and strong modulation on the amplitude of the reflected signal usually bring to fringe jumps` in the phase signal, which are a big problem when the phase values are much larger than 2 pi. The conditions in the JET divertor plasmas: plasma geometry, access and long oversized broad-band waveguide paths makes very difficult the phase measurements at the millimeter wave range. AM reflectrometry is to some extension an intermediate solution between the classical phase delay reflectometry, so far applied to small distances, and the time domain reflectrometry, used for ionospheric studies and recently also proposed for fusion plasma. the main advantage is to allow the use of millimeter wave reflectometry with moderate phase shifts (approx 2 pi). (author)
Citation Formats
Sanchez, J, Branas, T, Estrada, T, and Luna, E de la.
Research proposal on : amplitude modulated reflectometry system for JET divertor.
Spain: N. p.,
1992.
Web.
Sanchez, J, Branas, T, Estrada, T, & Luna, E de la.
Research proposal on : amplitude modulated reflectometry system for JET divertor.
Spain.
Sanchez, J, Branas, T, Estrada, T, and Luna, E de la.
1992.
"Research proposal on : amplitude modulated reflectometry system for JET divertor."
Spain.
@misc{etde_10121284,
title = {Research proposal on : amplitude modulated reflectometry system for JET divertor}
author = {Sanchez, J, Branas, T, Estrada, T, and Luna, E de la}
abstractNote = {Amplitude Modulated reflectrometry is presented here as a tool for density profile measurements in the JET divertor plasmas. One of the main problems which has been presented in most reflectometers during the last years is the need for a coherent tracking of the phase delay: fast density fluctuations and strong modulation on the amplitude of the reflected signal usually bring to fringe jumps` in the phase signal, which are a big problem when the phase values are much larger than 2 pi. The conditions in the JET divertor plasmas: plasma geometry, access and long oversized broad-band waveguide paths makes very difficult the phase measurements at the millimeter wave range. AM reflectrometry is to some extension an intermediate solution between the classical phase delay reflectometry, so far applied to small distances, and the time domain reflectrometry, used for ionospheric studies and recently also proposed for fusion plasma. the main advantage is to allow the use of millimeter wave reflectometry with moderate phase shifts (approx 2 pi). (author)}
place = {Spain}
year = {1992}
month = {Dec}
}
title = {Research proposal on : amplitude modulated reflectometry system for JET divertor}
author = {Sanchez, J, Branas, T, Estrada, T, and Luna, E de la}
abstractNote = {Amplitude Modulated reflectrometry is presented here as a tool for density profile measurements in the JET divertor plasmas. One of the main problems which has been presented in most reflectometers during the last years is the need for a coherent tracking of the phase delay: fast density fluctuations and strong modulation on the amplitude of the reflected signal usually bring to fringe jumps` in the phase signal, which are a big problem when the phase values are much larger than 2 pi. The conditions in the JET divertor plasmas: plasma geometry, access and long oversized broad-band waveguide paths makes very difficult the phase measurements at the millimeter wave range. AM reflectrometry is to some extension an intermediate solution between the classical phase delay reflectometry, so far applied to small distances, and the time domain reflectrometry, used for ionospheric studies and recently also proposed for fusion plasma. the main advantage is to allow the use of millimeter wave reflectometry with moderate phase shifts (approx 2 pi). (author)}
place = {Spain}
year = {1992}
month = {Dec}
}