Proof-of-concept experiment for on-line laser induced breakdown spectroscopy analysis of impurity layer deposited on optical window and other plasma facing components of Aditya tokamak

Gulab Singh Maurya; Rohit Kumar; Ajai Kumar; Awadhesh Kumar Rai

doi:10.1063/1.4938176

Proof-of-concept experiment for on-line laser induced breakdown spectroscopy analysis of impurity layer deposited on optical window and other plasma facing components of Aditya tokamak

Rev Sci Instrum. 2015 Dec;86(12):123112. doi: 10.1063/1.4938176.

Authors

Gulab Singh Maurya¹, Rohit Kumar¹, Ajai Kumar², Awadhesh Kumar Rai¹

Affiliations

¹ Laser Spectroscopy Research Laboratory, Department of Physics, University of Allahabad, UP 211002, India.
² Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428, India.

PMID: 26724011
DOI: 10.1063/1.4938176

Abstract

In the present manuscript, we demonstrate the design of an experimental setup for on-line laser induced breakdown spectroscopy (LIBS) analysis of impurity layers deposited on specimens of interest for fusion technology, namely, plasma-facing components (PFCs) of a tokamak. For investigation of impurities deposited on PFCs, LIBS spectra of a tokamak wall material like a stainless steel sample (SS304) have been recorded through contaminated and cleaned optical windows. To address the problem of identification of dust and gases present inside the tokamak, we have shown the capability of the apparatus to record LIBS spectra of gases. A new approach known as "back collection method" to record LIBS spectra of impurities deposited on the inner surface of optical window is presented.