Thermomechanical Fatigue in Sub-THz Vacuum Electron Devices

Improved superconducting hot-electron bolometer devices for the THz range

Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical conditions during the mixing process. We find that the mix...

Thermomechanical Fatigue Life Prediction of Notched

RAPID PULSATIONS IN SUB-THz SOLAR BURSTS

A new solar burst emission spectral component has been found showing sub-THz fluxes increasing with frequency, spectrally separated from the well known microwave component. Rapid pulsations are found present in all events observed at the two frequencies of the solar submillimeter-wave telescope (SST): 212 and 405 GHz. They were studied in greater detail for three solar bursts exhibiting the new...

Damage evolution in compacted graphite iron during thermomechanical fatigue testing

Thermomechanical fatigue properties of a compacted graphite iron in an out of phase configuration are investigated for different maximum temperatures and mechanical strain ranges. Furthermore, the stress-strain hysteresis loops are analysed and in particular the unloading modulus, i.e. the elastic modulus measured during specimen unloading, is obtained from each cycle. This material parameter h...

Sub-THz Electron Spin Resonance spectroscopy based on a Martin-Puplett interferometer

Christian Caspers, ∗ Pedro Freire da Silva, Murari Soundararajan, M. Ali Haider, and Jean-Philippe Ansermet Laboratoire de Physique des Matériaux Nanostructurés LPMN, École Polytechnique Fédérale de Lausanne EPFL, 1015 Lausanne, Switzerland Instituto Superior Técnico, Technical University of Lisboa, 49-001 Lisboa, Portugal Department of Chemical Engineering, Indian Institute of Technology Delhi...