Molecular-based Flow Measurement in Cryogenic Helium and High-Power Target System at FRIB
Speaker: Jian Gao
Date: Wednesday, March 9, 2022
Time: 9:45am – 10:45am
Abstract
Motivated by engineering application of cryogenic helium as a coolant, as well as the generation of high Reynolds number turbulent flows due to its small kinematic viscosity, the development of effective visualization and velocimetry techniques is important. In this talk, I will discuss the development of helium molecular tracers that are created via femtosecond-laser field-ionization of helium atoms and can be imaged using a laser-induced fluorescence technique. This powerful velocimetry technique has been validated and applied to extract quantitative information about the flow field in cryogenic helium. Besides, I will introduce high power target system at Facility for Rare Isotope Beams (FRIB). The facility is designed to reach beam on target power >400 kW for state-of-the-art rare isotope studies. Due to extremely high power density and heavy ion induced radiation damage on the material, one of the major challenges of the FRIB project is the design and integration of the high power target system. The status and future development of FRIB target system will be presented.
Bio
Dr. Jian Gao received his PhD in Mechanical Engineering from Florida State University in 2017. Dr. Gao’s PhD dissertation focused on the development of a novel flow-visualization technique in cryogenic helium based on the generation and imaging of thin line of excited helium tracer modules. From 2017 to date, Dr. Gao worked at Facility for Rare Isotope Beams (FRIB) in Michigan State University for several projects. FRIB will use projectile fragmentation and induced in-flight fission of heavy-ion primary beams at energies of 200 Mev/u and up to 400 kW beam power for nuclear experiments. Currently Dr. Gao works as Target and Beam Dump System group leader and is responsible for the development of high power target system at FRIB.
Have questions?
Mary Catherine Bunde
Senior Education Administrator
National Institute of Aerospace
mary.bunde@nianet.org