Publication

Ultrasoft x-ray spectroscopy using multilayer mirrors on TCV

Henri Weisen, Alexey Zabolotskiy
2004
Journal Articles

Abstract

The TCV tokamak is equipped with a four-channel ultrasoft x-ray monochromator allowing low resolution (lambda/Deltalambda similar to 30) measurements in the energy range 200-800eV. Its main purpose is to simultaneously monitor emission from four of the main Kalpha resonance lines of highly ionized light impurities such as boron, carbon, nitrogen and oxygen. Wavelength selectivity is achieved using synthetic multilayer mirrors having 30-40 alternate layers with layer periods in the range 3-7 nm, depending on the design wavelength range. Recently the instrument was modified for measuring the radial profiles of Kalpha and Lyman-alpha lines from He-like and H-like intrinsic carbon impurities to allow estimates of impurity diffusivities by comparisons with simulations using the impurity transport code STRAHL.

Official source

https://infoscience.epfl.ch/entities/publication/2fac9463-96a7-4586-a650-145a692ec4e5

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Henri Weisen, Alexey Zabolotskiy
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2fac9463-96a7-4586-a650-145a692ec4e5

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.

Tokamak

A tokamak (ˈtoʊkəmæk; токамáк) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion power. , it was the leading candidate for a practical fusion reactor. Tokamaks were initially conceptualized in the 1950s by Soviet physicists Igor Tamm and Andrei Sakharov, inspired by a letter by Oleg Lavrentiev. The first working tokamak was attributed to the work of Natan Yavlinsky on the T-1 in 1958.

Dielectric mirror

A dielectric mirror, also known as a Bragg mirror, is a type of mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material. By careful choice of the type and thickness of the dielectric layers, one can design an optical coating with specified reflectivity at different wavelengths of light. Dielectric mirrors are also used to produce ultra-high reflectivity mirrors: values of 99.999% or better over a narrow range of wavelengths can be produced using special techniques.

Related publications (29)

Ultrasoft x-ray spectroscopy using multilayer mirrors on TCV

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