Publication

New diagnostics for density measurement on Frascati Tokamak upgrade

Fabio Avino
2013
Conference Papers

Abstract

In FTU, density profile is measured with two new diagnostics: a CO2/CO scanning interferometer and a time-of-flight radar (denominated refractometer). The first, using two scanning beams, can provide a plasma density profile every 62.5 mu s. Two lasers (CO2/CO) are employed for compensation of mechanical vibration of optical components. The scanning component is a small mirror (phi=5 mm) tilting at 8 kHz. The oscillation is cancelled out by a second reflection on this mirror. The time-of-flight refractometer is a two-frequency radar (51.5 GHz and 60.5 GHz) which measures the plasma refractive index from the delay time of an RF pulse that goes through the plasma and is reflected back by the metallic vacuum vessel. The line density and the profile peaking by both diagnostics are in good agreement (C) 2012 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/db2ae7cb-2b34-4aab-9276-46ec5961672d

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Fabio Avino
2013
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/db2ae7cb-2b34-4aab-9276-46ec5961672d

About this result

Related concepts (32)

Mirror

A mirror or looking glass is an object that reflects an . Light that bounces off a mirror will show an image of whatever is in front of it, when focused through the lens of the eye or a camera. Mirrors reverse the direction of the image in an equal yet opposite angle from which the light shines upon it. This allows the viewer to see themselves or objects behind them, or even objects that are at an angle from them but out of their field of view, such as around a corner.

Imaging radar

Imaging radar is an application of radar which is used to create two-dimensional s, typically of landscapes. Imaging radar provides its light to illuminate an area on the ground and take a picture at radio wavelengths. It uses an antenna and digital computer storage to record its images. In a radar image, one can see only the energy that was reflected back towards the radar antenna. The radar moves along a flight path and the area illuminated by the radar, or footprint, is moved along the surface in a swath, building the image as it does so.

Curved mirror

A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems, like spherical lenses, suffer from spherical aberration.

Related publications (32)

New diagnostics for density measurement on Frascati Tokamak upgrade

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