Runaway electron diagnostics for the COMPASS tokamak using EC emission

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F18%3A00326948" target="_blank" >RIV/68407700:21340/18:00326948 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Runaway electron diagnostics for the COMPASS tokamak using EC emission

Original language description

Electron cyclotron emission measured vertically along the line of a constant magnetic field can yield information about the electron velocity distribution function and its evolution during a discharge [1]. A vertical ECE (V-ECE) diagnostic is available on COMPASS, a compact-sized tokamak operated at IPP Prague. We report on results from this diagnostic during runaway electron (RE) experiments. The V-ECE diagnostic on COMPASS consists of a 16-channel radiometer E-band horn antenna with a 76.5 - 88.3 GHz frequency range front-end. Simulations using the SPECE raytracing code [2] have aided the final diagnostic design and are employed for experimental data interpretation. Realised measurements of extraordinary and ordinary mode (X/O mode) in lowdensity (ne < 3 . 1019 m-3 ) RE experiments will be presented. The detected signal can be attributed to the 3rd harmonic emission from 50 - 140 keV electrons. However, the optical depth is rather low, which complicates the measured data interpretation. V-ECE measurements in low-density flattop discharges and in discharges with massive gas injections (MGI) of high-Z elements show correlations with other RE diagnostics, such as hard X-rays (HXR), photoneutron detectors and high-speed visible light cameras. Our results seem to be in an agreement with the principles of the primary runaway generation mechanisms

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

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

Article name in the collection

Europhysics Conference Abstracts vol. 42A

ISBN

978-1-5108-6844-1

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

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Publisher name

European Physical Society

Place of publication

Mulhouse

Event location

Praha

Event date

Jul 2, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000570226000030