| Monday 30 December 2024 | |
| Events for day: Wednesday 20 September 2023 |
| 11:00 - 12:00 Wednesday Weekly Seminar - meeting Introduction to Ultra-High Vacuum Systems in Particle Accelerators School PARTICLES AND ACCELERATORS Abstract: For operating the particle accelerators, providing the required vacuum pressure is crucial. In practice, the vacuum is needed to minimize the beam-gas interaction which has a significant impact on the beam lifetime, luminosity, intensity, and instability. The vacuum is also needed to avoid electrical discharge in high voltage instruments, reduce contamination of optics, prevent the material from corrosion and damage, thermally isolate cryogenic devices, and reduce the induced radioactivity and noises in detectors. In this presentation, an overview of ultra-high vacuum systems that are used in charge particle ac ... 14:00 - 15:00 Weekly Seminar Granular chains and entangled ropes: Comparison to polymer physics School NANO SCIENCES Macroscale chains have been proposed to give insight into the physics of molecular polymer systems. However, using the concept of thermodynamics for such macroscopic out-of-equilibrium systems is a matter of open debate. On the other hand, understanding the rheological response of systems of quasi-one-dimensional semiflexible materials, such as bead-chain packings, is currently a great challenge. In this talk, we study the dynamics of a single macro scale chain and an assembly of entangled chains in two different geometries and try to compare our findings with polymer physics when it is possible. For the entangled chain system, we observe a u ... |