Laser cleaning of diagnostic mirrors from tokamak-like carbon contaminants

被引：14

作者：

Maffini, A. ^{[1
]}

Uccello, A. ^{[1
]}

Dellasega, D. ^{[1
,2
]}

Russo, V. ^{[1
]}

Perissinotto, S. ^{[3
]}

Passoni, M. ^{[1
,2
]}

机构：

[1] Politecn Milan, Dipartimento Energia, I-20133 Milan, Italy

[2] EURATOM ENEA CNR Assoc, Ist Fis Plasma, CNR, Milan, Italy

[3] Ist Italian Tecnol, Ctr Nano Sci & Technol Polimi, Milan, Italy

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷

关键词：

FILMS;

D O I：

10.1016/j.jnucmat.2014.10.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents a laboratory-scale experimental investigation of laser cleaning of diagnostic First Mirrors (FMs). Redeposition of contaminants sputtered from tokamak first wall onto FMs surface could dramatically decrease their reflectivity in an unacceptable way for the functioning of the plasma diagnostic systems. Laser cleaning is a promising solution to tackle this issue. In this work, pulsed laser deposition was exploited to produce rhodium films functional as FMs and to deposit onto them carbon contaminants with tailored features, resembling those found in tokamaks. The same laser system was also used to perform laser cleaning experiments by means of a sample handling procedure that allows to clean some cm(2) in few minutes. The cleaning effectiveness was evaluated in terms of specular reflectivity recovery and mirror surface integrity. The effect of different laser wavelengths (lambda = 1064, 266 nm) on the cleaning process is also addressed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：944 / 947

页数：4

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