Conveners
C2Or3C: Miscellaneous II
- Matthew Hollister (Fermi National Accelerator Laboratory)
- Greg Tatkowski (Fermi National Accelerator Laboratory)
Cryostats for research and testing applications have been designed and implemented successfully for many years. The design features are selected to provide for the desired functionality with the most efficient operation, particularly with regard to refrigeration requirements. In this paper we introduce engineering figures, calculated table-plots and representative equations for the design,...
Molecular hydrogen occurs in two forms, the so-called ortho-hydrogen (parallel alignment of the nuclear spins) and para-hydrogen (antiparallel alignment of the nuclear spins). At a temperature of 293 K and above, hydrogen has 75% of ortho- and 25% para-content. The content of para-hydrogen increases with falling temperature. At a temperature of 20 K almost 100% para hydrogen is present. While...
The Einstein Telescope (ET), as the planned third-generation, underground gravitational-wave observatory for Europe, will increase the sensitivity compared to the current advanced detectors (Virgo, LIGO, KAGRA) and expand the frequency band to lower frequencies. Proposed as an equilateral triangle with 10 km long vacuum pipe arms, the Einstein Telescope will consist of three laser...
This study presents a quantum dot (QD) fluorescence spectroscopy platform for full-temperature-range testing, based on a micro-machined Joule-Thomson (JT) cooler. Full-temperature-range testing is essential for evaluating QD fluorescence materials in different temperature applications, as temperature can affect their luminescence efficiency and spectrum. The study focuses on graphene QDs...
Since 2018, NASA and the National Institute for Occupational Safety and Health (NIOSH) have been developing a liquid oxygen storage module (LOXSM) based upon the NASA patent-pending cryogenic flux capacitor (CFC) technology. The LOXSM is aimed at potentially replacing the gaseous or chemical-based oxygen supply used in current closed-circuit escape respirators (CCERs)—devices that must be...
Taconis oscillations represent spontaneous, usually unwanted excitation of acoustic modes in narrow tubes going from warm ambient environment into cold cryogenic space. These oscillations can drastically magnify heat leak and create vibrations undesirable for measurement instruments. In this study, modifications of classical constant-diameter tube are investigated. Specifically,...
