Laser transient gratings

Transient grating measurements are an excellent tool for studying the elastic and thermal transport properties of micron-thin material layers. Interference of two short pump laser beams generates a spatially periodic grating pattern on the sample surface. Absorption of the lights causes the formation of a temperature grating. Rapid thermal expansion also launches two counter propagating surfaceContinue reading “Laser transient gratings”

Phonons 2015

In July Felix attended the Phonons 2015 meeting at the University of Nottingham. He gave a talk entitled Helium-Implantation-Induced Changes in Elastic Properties of Tungsten: Surface Acoustic Wave Measurements and Multiscale Modelling. Great to hear about the latest exciting developments in the phonon community!

Defects go deep at high temperature

Temperature dependence of helium-implantation-induced lattice swelling in polycrystalline tungsten: X-ray micro-diffraction and Eigenstrain modelling I de Broglie, CE Beck, W Liu, F Hofmann Scripta Materialia 107 (2015) 96-99 Using synchrotron X-ray micro-diffraction and Eigenstrain analysis the distribution of lattice swelling near grain boundaries in helium-implanted polycrystalline tungsten is quantified. Samples heat-treated at up to 1473 KContinue reading “Defects go deep at high temperature”

TMS 2015, Orlando, Florida

Felix will travel to Florida to give an invited talk at TMS 2015. He will discuss recent work on the adverse effects of damage due to helium implantation in tungsten. Understanding these effects is vital for the successful development of nuclear fusion as a viable energy source.