Fuzz growth in the gaps of castellated W in PISCES-A: Experiment and modeling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00477432" target="_blank" >RIV/61389021:_____/17:00477432 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1361-6587/aa6b32" target="_blank" >http://dx.doi.org/10.1088/1361-6587/aa6b32</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6587/aa6b32" target="_blank" >10.1088/1361-6587/aa6b32</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fuzz growth in the gaps of castellated W in PISCES-A: Experiment and modeling

Popis výsledku v původním jazyce

A castellated W target with gaps of width 0.5, 1.0, and 1.5 mm is exposed at 1120 K to He ions in the PISCES-A linear plasma device. The average ion impact energy was 70 eV and the accumulated ion fluence 3.6 × 1026 m-2 over the top surface, which is exposed normal to the plasma flow. A layer of W fuzz of 3.4 0.4 .mu.m thick developed on the top surface. In addition, fuzz morphology is found to develop on the side walls of the gaps. Particle in cell modeling of the plasma-target sheath using the SPICE2 code predicts the plasma penetration into the gaps. The He ion flux to gap side walls falls off quasi-exponentially with depth with a decay rate dependent on the gap width. When the variation in He ion wall fluence is used in conjunction with the fluence dependent growth expression of Petty et al (2015 Nucl. Fusion 55 093033), modeling correctly predicts the observed maximum depth of formation, and measured variation of layer thickness, for fuzz found on the gap walls.

Název v anglickém jazyce

Fuzz growth in the gaps of castellated W in PISCES-A: Experiment and modeling

Popis výsledku anglicky

A castellated W target with gaps of width 0.5, 1.0, and 1.5 mm is exposed at 1120 K to He ions in the PISCES-A linear plasma device. The average ion impact energy was 70 eV and the accumulated ion fluence 3.6 × 1026 m-2 over the top surface, which is exposed normal to the plasma flow. A layer of W fuzz of 3.4 0.4 .mu.m thick developed on the top surface. In addition, fuzz morphology is found to develop on the side walls of the gaps. Particle in cell modeling of the plasma-target sheath using the SPICE2 code predicts the plasma penetration into the gaps. The He ion flux to gap side walls falls off quasi-exponentially with depth with a decay rate dependent on the gap width. When the variation in He ion wall fluence is used in conjunction with the fluence dependent growth expression of Petty et al (2015 Nucl. Fusion 55 093033), modeling correctly predicts the observed maximum depth of formation, and measured variation of layer thickness, for fuzz found on the gap walls.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Plasma Physics and Controlled Fusion

ISSN

0741-3335

e-ISSN

—

Svazek periodika

59

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

—

Kód UT WoS článku

000425803000001

EID výsledku v databázi Scopus

2-s2.0-85019404776