Helium nano-bubble formation in tungsten : measurement with grazing-incidence small angle x-ray scattering /

Helium nano-bubble formation in tungsten : measurement with grazing-incidence small angle x-ray scattering /

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Bibliographic Details
Author / Creator:Thompson, Matt, author.
Imprint:Cham, Switzerland : Springer, 2018.
Description:1 online resource
Language:English
Series:Springer theses
Springer theses.
Subject:
Small-angle x-ray scattering.
Tungsten.
Helium plasmas.
Helium plasmas.
Small-angle x-ray scattering.
Tungsten.
Format: E-Resource Book
URL for this record:http://pi.lib.uchicago.edu/1001/cat/bib/11690097
Hidden Bibliographic Details
ISBN:9783319960111
3319960113
9783319960104
3319960105
9783319960128
3319960121
Digital file characteristics:text file PDF
Notes:"Doctoral thesis accepted by the Australian National University, Canberra, Australia."
Includes bibliographical references.
Online resource; title from PDF title page (SpringerLink, viewed August 9, 2018).
Summary:This PhD thesis characterises the damage that occurs in tungsten when it is exposed to a fusion-like environment. The book presents pioneering work on the use of grazing-incidence small-angle X-ray scattering (GISAXS) to measure nano-bubble formation in tungsten exposed to helium plasma. The phenomenon of nanoscale bubble formation within metals during helium plasma exposure can lead to undesirable changes in the material properties, such as complex nanoscale surface modification or a reduction in thermal conductivity. As a result of this work, it is now possible to quantify how nanobubble behaviour changes within different materials, and under different plasma conditions. In 2015 the author published the first GISAXS study of helium-induced nanobubble formation in tungsten, demonstrating the viability of using GISAXS for this work. This paper has generated significant interest from the international fusion community and was selected as one of the highlights for the journal Nuclear Fusion.
Other form:Print version: Thompson, Matt. Helium nano-bubble formation in tungsten. Cham, Switzerland : Springer, 2018 3319960105 9783319960104
Standard no.:10.1007/978-3-319-96011-1
Table of Contents:
  • Intro; Supervisor's Foreword; Abstract; Preface; Parts of this thesis have been published in the following articles:; Acknowledgements; Contents; 1 Introduction; 1.1 Overview; 1.1.1 Fusion and ITER; 1.1.2 ITER Design; 1.2 Tungsten; 1.2.1 The Divertor and Material Requirements; 1.2.2 Physical Properties; 1.2.3 Thermal Shock; 1.2.4 Plasma Poisoning; 1.3 Helium-Induced Nanostructure Formation in W; 1.3.1 He Self-Trapping and Bubble Formation; 1.3.2 Nano-fuzz and Dust Formation; 1.3.3 Influence of He on H Retention.
  • 1.3.4 The Importance of Statistically Significant Empirical Validation of Computational Models1.4 Thesis Outline; References; 2 Developing a GISAXS Model to Enable Study of Nano-bubble Formation; 2.1 The Case for Grazing-Incidence Small Angle X-ray Scattering (GISAXS); 2.1.1 Limitations of TEM as a Tool to Study Nano-structures in W; 2.1.2 GISAXS Overview; 2.1.3 GISAXS Beamline Setup; 2.2 Building a GISAXS Model to Facilitate Analysis of He Nano-bubble Formation; 2.2.1 Model Overview; 2.2.2 X-ray Propagation Through Materials; 2.2.3 The GISAXS "Master Equation."
  • 3.2.2 TEM Counting and Statistical Calculations for Exponentially Distributed Data3.2.3 Fitting More Complex Diameter Distributions; 3.2.4 GISAXS Measurement and Modelling; 3.3 Comparison Between GISAXS and TEM Results; 3.3.1 Exponentially Distributed Diameters; 3.3.2 Log-Normal and Weibull Distributions; 3.3.3 Concluding Remarks; References; 4 Effect of He Fluence on Nano-bubble Growth; 4.1 He Fluence and W Performance; 4.2 Experimental Overview; 4.2.1 Sample Preparation; 4.2.2 MAGPIE-The MAGnetised Plasma Interaction Experiment; 4.2.3 PISCES-A.
  • 4.2.4 Methods for Measuring Nano-structure Growth4.3 Results; 4.3.1 Influence of Fluence on He Nano-bubble Diameters; 4.3.2 Effect of Fluence on Nano-bubble Depths; 4.4 Summary; References; 5 Effect of Sample Temperature and Transient Heat Loading on Nano-bubble Growth; 5.1 Temperature and Nano-bubbles; 5.2 Experimental Procedure; 5.2.1 NAGDIS-II; 5.2.2 PISCES-A + DIII-D; 5.3 Results; 5.3.1 Effect of Temperature on Bubble Growth; 5.3.2 Effect of Transient Thermal Loads; 5.4 Summary; References; 6 Investigating Synergistic Effects on W Performance with Magnum-PSI; 6.1 Synergy.

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