Conveners
Thu-Po-3.1: Cryo-aerospace, Quantum Systems & Materials
- Alisdair Douglas Seller (CERN)
Transporting cryogens, particularly for cryogenic propellant fueling, through pipelines from a storage tank is an indispensable process for undertaking a stable cryogenic mission. When cryogenic liquids are introduced into flow components at ambient temperature, they are bound to encounter vigorous two-phase instabilities including boiling and evaporation. The preliminary step of lowering the...
In this study, we present a comprehensive overview of gravity measurement method utilizing SQUID (Superconducting QUantum Interference Device) at cryogenic temperatures, along with the associated equipment. The measurement of gravity is an exceptionally delicate process, susceptible to real-time changes influenced by environmental factors. Therefore, a highly stable and high-resolution...
The 3He Joule-Thomson (JT) cryocooler utilizes the JT effect of 3He to typically achieve the temperature of below 2 K. When the 3He JT cryocooler obtains the temperature of below 2 K, the working fluid at the JT impedance must be in a choked state, which means the Mach number of working fluid at the JT impedance is 1. The working fluid behind the JT impedance at this situation is two-phase...
Experiments to characterise the physical, chemical and electrical properties of superconducting materials and electronics often require measurements to be made at a number of fixed temperature values within a desired cryogenic temperature range. Temperature-controlled cold tables working in the range 4 to 300K are widely available, however the technology used in these systems is not directly...
The study of heat transfer in conduction cooled current leads and digital electronic interconnects is of vital importance during the design of cryogenic electronic systems where the cost of cooling increases exponentially as temperature decreases. It is a thermally complex problem that combines heat transfer due to conduction between the hot and cold ends of the leads, as well as the Joule...
Normally cryogenic liquids such as oxygen or hydrogen are used as propellants of the launch vehicle. Densification of propellants means the density of propellants are increased by decreasing the cryogenic fluid temperature. Compared to common incompressible liquids, the density of cryogenic fluids changes more sensitively according to the temperature. Therefore, this densification technology...
A powerful table-top cryogenic plateform has been developed for Quantum computing applications. The system offers a cold plate optimized for the CMOS qubits technology developed by CEA/LETI for the QuCUBE ERC synergy project. The goal is to demonstrated a 100 CMOS-Qubits system, scalable to more than 1000 Qubits. The cryogenic system is designed for 100 mW cooling power at 500 mK, compatible...
We have developed a versatile cryogenic platform for research in optics. The optical cryostat offers an experimental volume of 100 x 100 x 100 mm with up to five 2-inches optical accesses. The cold plate is cooled to a temperature below 2K with 50 mW power available. The cryogenic system is based on a two-stages 4 Kelvin Pulse Tube and a 2 K helium Joule-Thomson cooler. The Pulse-Tube cold...
In order to reach the goal of 50% reduction of emissions by 2050 set by civil aviation industry bodies, the exploration of new and potentially disruptive technologies has become more and more crucial for Airbus in the last few years.
Aircraft electrification, identified as a major pillar of the de-carbonization strategy, while presenting major technological challenges, will also open new and...
Cryogenic sensors are widely adopted in cryogenic and semi-cryogenic rocket engines to measure the temperature values. These sensors are in-house developed resistance sensors and are calibrated in between 4.2 K to 300 K to ensure the desired redundancy, accuracy, and repeatability before their authentic use in space missions. With our in-house wet cryogenic calibration facility, these sensors...
Low temperature detectors operating at sub-Kelvin temperatures and in the FIR or X-ray wavelengths, are a key feature of space missions addressing the science of the universe. The thermal stability of the coldest cooling stage to which they are thermally coupled is crucial to their performance. This performance could significantly be compromised however, by the fluctuations of the thermal...
Pulse tube developments at CEA/SBT are focused on low-temperature Pulse tube cryocoolers, and more specifically on a basis of the cold tip architecture of the PT15K cooler previously developed by ALAT/TCBV/CEA. This pulse tube cooler was made to work at 15K, here, the objectives are to decrease its working temperature in order to produce a significant cooling power around 8K or lower.
A...
A cryogenic environment implies a lot of constraints and uncertainties when it comes to the use of mechanical parts since the material properties are thermally dependent. This is even more true when the mechanical part ensures the motion of a mechanism. In that context, the Centre Spatial de Liège (CSL) has developed a specific mechanism with 3D printed parts. The Mode Selector Mechanism (MSM)...
Thermal radiation has a significant role on cryogenic system, especially in vaccum environment, such as space. Cryogenic spectral emissivity is an important parameter to evaluate the properties of radiation materials, which can improve device efficiency and safety. The accurate measurement of cryogenic spectral emissivity at vacuum condition is helpful to predict and simulate the working state...
