Electron temperature and heat load measurements in the COMPASS divertor using the new system of probes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00477303" target="_blank" >RIV/61389021:_____/17:00477303 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/17:00313541 RIV/00216208:11320/17:10371452

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1741-4326/aa7e09" target="_blank" >http://dx.doi.org/10.1088/1741-4326/aa7e09</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1741-4326/aa7e09" target="_blank" >10.1088/1741-4326/aa7e09</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electron temperature and heat load measurements in the COMPASS divertor using the new system of probes

Popis výsledku v původním jazyce

A new system of probes was recently installed in the divertor of tokamak COMPASS in order to investigate the ELM energy density with high spatial and temporal resolution. The new system consists of two arrays of rooftop-shaped Langmuir probes (LPs) used to measure the floating potential or the ion saturation current density and one array of Ball-pen probes (BPPs) used to measure the plasma potential with a spatial resolution of similar to ~3.5 mm. The combination of floating BPPs and LPs yields the electron temperature with microsecond temporal resolution. We report on the design of the new divertor probe arrays and first results of electron temperature profile measurements in ELMy H-mode and L-mode. We also present comparative measurements of the parallel heat flux using the new probe arrays and fast infrared termography (IR) data during L-mode with excellent agreement between both techniques using a heat power transmission coefficient gamma = 7. The ELM energy density epsilon parallel to was measured during a set of NBI assisted ELMy H-mode discharges. The peak values of epsilon parallel to were compared with those predicted by model and with experimental data from JET, AUG and MAST with a good agreement.

Název v anglickém jazyce

Electron temperature and heat load measurements in the COMPASS divertor using the new system of probes

Popis výsledku anglicky

A new system of probes was recently installed in the divertor of tokamak COMPASS in order to investigate the ELM energy density with high spatial and temporal resolution. The new system consists of two arrays of rooftop-shaped Langmuir probes (LPs) used to measure the floating potential or the ion saturation current density and one array of Ball-pen probes (BPPs) used to measure the plasma potential with a spatial resolution of similar to ~3.5 mm. The combination of floating BPPs and LPs yields the electron temperature with microsecond temporal resolution. We report on the design of the new divertor probe arrays and first results of electron temperature profile measurements in ELMy H-mode and L-mode. We also present comparative measurements of the parallel heat flux using the new probe arrays and fast infrared termography (IR) data during L-mode with excellent agreement between both techniques using a heat power transmission coefficient gamma = 7. The ELM energy density epsilon parallel to was measured during a set of NBI assisted ELMy H-mode discharges. The peak values of epsilon parallel to were compared with those predicted by model and with experimental data from JET, AUG and MAST with a good agreement.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Nuclear Fusion

ISSN

0029-5515

e-ISSN

—

Svazek periodika

57

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

AT - Rakouská republika

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000407218600006

EID výsledku v databázi Scopus

2-s2.0-85028453359