Runaway electron diagnostics for the COMPASS tokamak using EC emission

Kód výsledku v 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>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Runaway electron diagnostics for the COMPASS tokamak using EC emission

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

Runaway electron diagnostics for the COMPASS tokamak using EC emission

Popis výsledku anglicky

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

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Europhysics Conference Abstracts vol. 42A

ISBN

978-1-5108-6844-1

ISSN

—

e-ISSN

—

Počet stran výsledku

4

Strana od-do

—

Název nakladatele

European Physical Society

Místo vydání

Mulhouse

Místo konání akce

Praha

Datum konání akce

2. 7. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000570226000030