title: 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.
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.
authors.affiliation: Laser Spectroscopy Research Laboratory, Department of Physics, University of Allahabad, UP 211002, India.
authors.forename: Gulab Singh
authors.initials: GS
authors.lastname: Maurya
authors.affiliation: Laser Spectroscopy Research Laboratory, Department of Physics, University of Allahabad, UP 211002, India.
authors.forename: Rohit
authors.initials: R
authors.lastname: Kumar
authors.affiliation: Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428, India.
authors.forename: Ajai
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Laser Spectroscopy Research Laboratory, Department of Physics, University of Allahabad, UP 211002, India.
authors.forename: Awadhesh Kumar
authors.initials: AK
authors.lastname: Rai