So called moderators are key components of a neutron source and are used to slow down high energy neutrons, released by a nuclear reaction, to a required energy. Cold neutrons (ca. 10 meV energy) are required for a variety of experiments, which is why (cold) moderators are an important part of a neutron source. A pressure vessel filled with liquid para hydrogen is for example a suitable cold...
The potential of geothermal resources is currently limited by existing drilling technology. To address this issue, the DeepU project is investigating the use of laser and cryogenic gas to drill deep wells (>4 km) to create a U-shaped closed-loop geothermal heat exchanger. This technology includes a high-power laser source and optics, a drill string, a drill head, a flushing system and some...
Our goal is to develop testing methodologies to evaluate the performance and reliability of commercial off-the-shelf fully packaged MEMS switches for cryogenic applications. RF Micro Electro Mechanical Systems (MEMS) switches possess a number of advantages over conventional switches, such as lower insertion loss, high isolation and linearity, faster switching speed, smaller size, and very low...
Current cryocooler technologies rely on compressors and displacers to generate pressure oscillations requiring high electrical power and regular maintenance intervals. These requirements limit the convenience of cryocoolers for renewable energy, specifically zero-boil-off applications. Thermoacoustic instabilities are spontaneously excited sound waves in resonators, which transport energy...
Cryogenic pulsating heat pipes (PHPs) are considered as alternative efficient thermal link to cool moderate heat load superconducting devices to replace heavy thermal braids or gravity-assisted cooling loops associated in general to cryocooler as cold source. A perfect application to these type of heat pipe is rotating application such as Gantry system where gravity-assisted loops are...
With the increasing cryocooler-based cooling techniques, there is a growing demand for thermal links that efficiently transfer heat load to the cryocooler stages. This demand can be addressed by pulsating heat pipes (PHPs) designed to operate effectively at cryogenic temperatures.
Despite progress in this field, the current literature does not allow for precise prediction of PHP performance...
Cryogenics and superconductivity have revolutionized biomedical applications, particularly in cryosurgery and cryo-diagnostics. These technologies enable groundbreaking instruments and methods for precise medical interventions and advanced diagnostics. The development journey has been marked by significant technical challenges and milestones. This paper summarizes key achievements （including...
Cryoablation has emerged as a vital minimally invasive technique for treating localized cancers, leveraging cryogenic probes to freeze and destroy tumor tissues. The geometry of cryoprobe tips significantly influences the freezing dynamics, including heat transfer efficiency, ice ball propagation, and the preservation of surrounding healthy tissues.
This study investigates the impact of...
