Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00481373" target="_blank" >RIV/61389021:_____/17:00481373 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.fusengdes.2017.01.027" target="_blank" >http://dx.doi.org/10.1016/j.fusengdes.2017.01.027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fusengdes.2017.01.027" target="_blank" >10.1016/j.fusengdes.2017.01.027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks.

Popis výsledku v původním jazyce

n order to avoid metal surface melting of divertor targets of big tokamak fusion reactors by localized ELM heat loads, sudden detachment loss or VDEs, we study a new technique of spreading the heat flux by harmonic divertor strike point sweeping using a dedicated divertor coil. We ran 2D dynamic heat conduction simulation using real infra-red data of large ELMs heat fluxes on JET divertor target, rescaled for EU DEMO reactor (B-0 = 6 T, I-p =21 MA, R-0 = 9 m). Aiming for the surface temperature suppression factor of 4, this requires sweeping with amplitude*frequency=7cm*2 kHz. Building the divertor coil out of 27 tons of copper, this requires 0.8 MW cooling. Triggered by analog divertor heat flux signal, dedicated dynamic Fiesta simulation scenario requires 54 capacitive energy storages at 1500 V (6mF) discharged into 54 divertor coils, each with AC current of 130kA for each ELM event for similar to 4 ms (with waiting time 40 ms). The Ix B-tor forces would yield less than 0.1 mm rotational vibrations of the coil at the ELM frequency (similar to 20 Hz). The DEMO divertor surface temperature suppression reaches factor of 9 with 18 kV, 20 cm, 7.5 kHz, 400 kA. We also calculate system requirements (0.6mF, 5 kV & 60kA -> suppression factor = 2) for ASDEX Upgrade using the upper divertor coil. Since we found no show-stoppers, this technique seems attractive for big tokamaks.

Název v anglickém jazyce

Feasibility study of fast swept divertor strike point suppressing transient heat fluxes in big tokamaks.

Popis výsledku anglicky

n order to avoid metal surface melting of divertor targets of big tokamak fusion reactors by localized ELM heat loads, sudden detachment loss or VDEs, we study a new technique of spreading the heat flux by harmonic divertor strike point sweeping using a dedicated divertor coil. We ran 2D dynamic heat conduction simulation using real infra-red data of large ELMs heat fluxes on JET divertor target, rescaled for EU DEMO reactor (B-0 = 6 T, I-p =21 MA, R-0 = 9 m). Aiming for the surface temperature suppression factor of 4, this requires sweeping with amplitude*frequency=7cm*2 kHz. Building the divertor coil out of 27 tons of copper, this requires 0.8 MW cooling. Triggered by analog divertor heat flux signal, dedicated dynamic Fiesta simulation scenario requires 54 capacitive energy storages at 1500 V (6mF) discharged into 54 divertor coils, each with AC current of 130kA for each ELM event for similar to 4 ms (with waiting time 40 ms). The Ix B-tor forces would yield less than 0.1 mm rotational vibrations of the coil at the ELM frequency (similar to 20 Hz). The DEMO divertor surface temperature suppression reaches factor of 9 with 18 kV, 20 cm, 7.5 kHz, 400 kA. We also calculate system requirements (0.6mF, 5 kV & 60kA -> suppression factor = 2) for ASDEX Upgrade using the upper divertor coil. Since we found no show-stoppers, this technique seems attractive for big tokamaks.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

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

Fusion Engineering and Design

ISSN

0920-3796

e-ISSN

—

Svazek periodika

123

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

4

Strana od-do

646-649

Kód UT WoS článku

000418992000134

EID výsledku v databázi Scopus

2-s2.0-85011103413