Calibration-free laser-based spectroscopic study of Sn-based alloys

2021 ◽  
Author(s):  
S. Atikukke ◽  
Alicia Marín Roldán ◽  
Vishal Dwivedi ◽  
Matej Veis ◽  
Pavel Veis
Keyword(s):  
Liquid Metals ◽  
Experimental Conditions ◽  
Term Operation ◽  
Breakdown Spectroscopy ◽  
Plasma Facing Components ◽  
Laser Induced Breakdown ◽  
Material Erosion ◽  
Short And Long Term ◽  
Calibration Free

Abstract The elemental quantification of liquid metal divertor (LMD) surface is important for understanding the material erosion, migration, re-deposition, and fuel retention in Plasma-Facing Components (PFCs). Currently, LMD are attractive candidates for the short- and long-term operation of fusion devices like DEMO. Liquid metals can provide self-cooling, self-replenishing plasma-facing surfaces requiring very little upkeep. In a previous work, we studied Li and LiSn layers deposited on attachment screws in the COMPASS tokamak by means of CF-LIBS. Several problems were encountered related to the detection of Sn in LiSn. Thus, in the present work, we are optimizing the experimental conditions for the detection of Sn I-II and Pb I-II in Pb-containing Sn-based alloys, performing the quantification of Pb in traces and in bulk quantities using Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS) approach.

Fast Determination of Phosphorus Concentration in Phosphogypsum Waste Using Calibration-Free LIBS in Air and Helium

2021 ◽  
Author(s):  
Khaled Elsayed ◽  
Walid Tawfik ◽  
Ashraf E M Khater ◽  
Tarek S Kayed ◽  
Mohamed Fikry
Keyword(s):  
Complete Analysis ◽  
Phosphorus Concentration ◽  
Stark Broadening ◽  
Breakdown Spectroscopy ◽  
P Concentration ◽  
Characteristic Lines ◽  
Laser Induced Breakdown ◽  
Novel Method ◽  
Calibration Free

Abstract This work represents a novel method to determine phosphorus (P) concentration in phosphogypsum (PG) waste samples using calibration-free laser-induced breakdown spectroscopy (LIBS). A 50 mJ Q-switched Nd: YAG laser has generated the PG LIBS spectrum. Spectroscopic analysis of plasma evolution has been characterized by electron density Ne and electron temperature Te using the emission intensity and stark broadening for P I characteristic lines 213.61, 214.91, and 215.40 nm under non-purged (air) and purged (helium) conditions. It was found that both Te and Ne have significant changes linearly with P concentrations 4195, 5288, 6293, and 6905 ppm. The values of plasma Te and Ne increased from about 6900 to 10000 K and 1.1×1017 to 3.4×1017 cm− 3, respectively, for the non-purged PG. On the other hand, Te and Ne ranged from 8200 to 11000 K and 1.4×1017 to 3.5×1017 cm− 3, respectively, for the PG purged with helium. It is concluded that Te and Ne values represent a fingerprint plasma characterization for a given P concentration in PG samples, which can be used to identify P concentration without a PG's complete analysis. These results demonstrate a new achievement in the field of spectrochemical analysis of environmental applications.

The high dependence of polarization resolved laser-induced breakdown spectroscopy on experimental conditions

2012 ◽  
Vol 21 (7) ◽  
pp. 074204 ◽  
Author(s):  
Nakimana Agnes ◽  
Zuo-Qiang Hao ◽  
Jia Liu ◽  
Hai-Yan Tao ◽  
Xun Gao ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Experimental Conditions ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Detecting Dust on Plasma-Facing Components in a Next-Step Tokamak Using a Laser-Induced Breakdown Spectroscopy Technique

2002 ◽  
Vol 41 (1) ◽  
pp. 32-43 ◽  
Author(s):  
Gennadij T. Razdobarin ◽  
Gianfranco Federici ◽  
Vladimir M. Kozhevin ◽  
Eugeny E. Mukhin ◽  
Vladimir V. Semenov ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopy Technique ◽  
Breakdown Spectroscopy ◽  
Plasma Facing Components ◽  
Laser Induced Breakdown

Verbalization and musical memory in string players

2017 ◽  
Vol 23 (2) ◽  
pp. 212-230
Author(s):  
Eric Timperman ◽  
Peter Miksza
Keyword(s):  
Recall Performance ◽  
Experimental Conditions ◽  
Immediate Recall ◽  
Short And Long Term ◽  
The Creation ◽  
24 Hour Recall ◽  
Associative Recall ◽  
Verbal Analysis ◽  
Musical Memory

The purpose of this study was to examine the effect of verbalization about a brief etude on collegiate string players’ short- and long-term recall of the etude in question. We examined competing hypotheses that suggest it is possible that verbalization (i.e., verbal analysis of musical features) (a) could aid in recall both by highlighting patterns and constraints that inform the music’s creation and by facilitating the creation of explicit performance cues that help to bridge gaps between associative recall chains or (b) may hinder recall by interfering with the creation of procedural and auditory memories necessary for musical performance. Participants ( N = 20) were assigned to experimental conditions in which they learned an unfamiliar etude either through repetition alone or through repetition followed by the completion of a verbalization worksheet provided by the experimenter. Recall was tested both immediately following initial practice and 24 hours later to examine the effect of verbalization on both short- and long-term retention. Findings indicated no differences between groups on immediate recall performance but significant differences at the 24-hour recall task with participants in the verbalization condition recalling more material. In addition, the patterns of errors found across groups indicated a strong primacy effect. Theoretical implications for the study of memory processes in musical contexts and practical implications regarding the preparation of memorized performance are discussed.

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