Conceptual design of microwave interferometric system for high densities on the COMPASS-U tokamak

Result code in IS VaVaI

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Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Conceptual design of microwave interferometric system for high densities on the COMPASS-U tokamak

Original language description

The COMPASS-U tokamak is under construction in the Institute of Plasma Physics in Prague. Expected high plasma densities in COMPASS-U up to 5x1020 m-3 and a high magnetic field up to 5 T require a new design of a sub-mm interferometer. The proposed solution for real-time line-integrated electron density measurements is based on an ”unambiguous” channel.nThe introduced design of the microwave interferometric system will allow precise measurements in a wide density range as well as its use for a real-time density feedback. The technical solution of the interferometer is based on solid-state element technology. Among main features of this system there is a use of two microwave transceivers at close frequencies and a principle of the „unambiguous” channel. Conceptual design of the quasi optic focusing system including the in-vessel reflection mirror placed on the central column is also introduced.nThe study of both vertical and horizontal orientations of the interferometer with respect to an influence of different plasma shapes, plasma density profiles and possible mechanical vibrations to the density measurement is presented.nRay tracing simulations done by the FIESTA-8, TORE beam, Zemax and Cherab codes are shown and demonstrate propagation of the probing waves through COMPASS-U plasmas. The plasmas (equilibrium, profiles) are simulated using METIS.nCalculations of the coefficient for correction of a non-linear dependence of the refraction index on plasma density were done using the WKB and Full wave methods. Coefficients for real-time correction were calculated using numerical methods already tested on the COMPASS tokamak.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů