guest ::
| Home > Workflow collections > Publication Charges > On the use of rhodium mirrors for optical diagnostics in ITER |
| Home > Workflow collections > Publication Charges > On the use of rhodium mirrors for optical diagnostics in ITER |
| Journal Article | FZJ-2019-02743 |
; ; ; ; ; ; ; ; ; ; ;
2019
Elsevier
New York, NY [u.a.]
This record in other databases: 
Please use a persistent id in citations: doi:10.1016/j.fusengdes.2019.04.031
Abstract: The first mirrors of optical diagnostics in ITER are exposed to high radiation and fluxes of particles which escape the plasma, in the order of $10^{20} m^{−2}s^{−1}$. At the position of the mirror, the flux may still reach about $10^{18} m^{−2}s^{−1}$. First mirrors are thus the most vulnerable in-vessel optical components, being subject to erosion, esp. by fast charge-exchange neutrals, or to deposition of impurities at flux rates which can reach 0.05 nm/s. The material selected for the reflecting surface must combine a high optical reflectivity in a wide spectral range and a sufficient resistance to physical sputtering during normal operation and during mirror cleaning discharges, if any is installed. Rhodium ($^{103}Rh$) was identified early as a possible or even promising candidate. It combines several attractive properties, for instance a mass which leads in most cases to low sputtering yields together with an optical reflectance ($\mathscr{R}_{Rh}≈75\%$) which is much higher than of some other options. $\mathscr{R}_{Rh}$is insensitive to large temperature changes. Rhodium is fairly inert and its low oxidation is an appreciable advantage in case of steam ingress events.The core-plasma CXRS diagnostic in ITER (UPP 3) have now turned to Rh as a baseline. The aim is to procure monocrystalline rhodium (SC-Rh) to mitigate the increase of the diffuse reflection with the damage due to physical sputtering.
; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)