Results 11 to 20 of about 852,283 (182)

Minimising flow losses within the pulse tube of a Stirling pulse tube cryocooler [PDF]

IOP Conference Series: Materials Science and Engineering, 2019
Successful operation of Stirling pulse tube cryocoolers relies on minimising flow mixing within the pulse tube. Hence, the pulse tube and the flow straighteners at either end must be designed with great care. In this study, the flow within the pulse tube of an existing Stirling pulse tube cryocooler is numerically analysed and alternative flow ...
Abolghasemi, M, Stone, R, Dadd, M, Bailey, P, Liang, K   +4 more
openaire   +3 more sources

Coupled disturbance analysis of a pulse tube cryocooler [PDF]

Vibroengineering Procedia, 2017
To predict accurate micro-vibration produced by a spaceborne payload mounted pulse tube cryocooler (PTC), a coupled disturbance analysis of cryocooler with flexible support structures have been discussed and investigated. A coupled transfer function matrix is introduced by improving the traditional disturbance analysis.
Shiqi Li, Heng Zhang, Shiping Liu, Yue Wang   +3 more
openaire   +2 more sources

Towards a wavefront-preservation X-ray crystal monochromator for high-repetition-rate FELs. [PDF]

J Synchrotron Radiat, 2023
The thermal deformation requirement for wavefront preservation through an X‐ray crystal monochromator is found to restrict the standard deviation of the height error to less than 25 pm under certain conditions. By optimizing the effective cooling temperature of liquid‐nitrogen‐cooled crystals, combined with compensation of the second‐order component of
Zhang L, Seaberg M, Yavaş H.
europepmc   +2 more sources

High/low temperature setups for submillimetric samples under various extreme conditions at the AILES beamline. [PDF]

J Synchrotron Radiat
Two complementary high‐ and low‐temperature experimental setups have been developed at the AILES beamline of Synchrotron SOLEIL to enable infrared and terahertz spectroscopy of submillimetric samples under extreme and well controlled pressure and temperature conditions (from 10 K to 600 K and from vacuum up to 100 GPa).
Taverna C, Rader K, Brubach JB, Voute A, Dronova M, Couillard-Labonnote L, Libois Q, Roy P, Verseils M.   +8 more
europepmc   +2 more sources

Site‐Selective Enhancement of Superconducting Nanowire Single‐Photon Detectors via Local Helium Ion Irradiation

Advanced Quantum Technologies, Volume 6, Issue 12, December 2023., 2023
Homogeneous performance in superconducting nanowire single‐photon detector (SNSPD) arrays is challenging. This work explores helium ion irradiation to tune detection efficiency, switching current, and critical temperature of individual devices on the same chip. After irradiation, 12 nm thick SNSPDs show an efficiency increase from <0.05% to 55.3%. Thin‐
Stefan Strohauer, Fabian Wietschorke, Lucio Zugliani, Rasmus Flaschmann, Christian Schmid, Stefanie Grotowski, Manuel Müller, Björn Jonas, Matthias Althammer, Rudolf Gross, Kai Müller, Jonathan J. Finley   +11 more
wiley   +1 more source

Evaluating the GeoSnap 13‐μ$$ \mu $$m cutoff HgCdTe detector for mid‐IR ground‐based astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract New mid‐infrared HgCdTe (MCT) detector arrays developed in collaboration with Teledyne Imaging Sensors (TIS) have paved the way for improved 10‐μ$$ \mu $$m sensors for space‐ and ground‐based observatories. Building on the successful development of longwave HAWAII‐2RGs for space missions such as NEO Surveyor, we characterize the first 13‐μ ...
Jarron M. Leisenring, Dani Atkinson, Rory Bowens, Vincent Douence, William F. Hoffmann, Michael R. Meyer, John Auyeung, James Beletic, Mario S. Cabrera, Alexandra Z. Greenbaum, Philip Hinz, Derek Ives, William J. Forrest, Craig W. McMurtry, Judith L. Pipher, Eric Viges   +15 more
wiley   +1 more source

Anisotropic NMR data acquisition with a prototype 400 MHz cryogen‐free NMR spectrometer

Magnetic Resonance in Chemistry, Volume 61, Issue 9-10, Page 530-543, September-October 2023., 2023
Prototype 400 MHz cryogen‐free power‐driven HTS NMR spectrometer, installed in the fumehood in our chemistry laboratory, was evaluated for the first time for relative stereochemical analysis of three commercial natural products (artemisinin, artemether, and dihydroartemisinin) via measurement of anisotropic NMR data through residual dipolar couplings ...
Maria Victoria Silva Elipe, Ikenna Edward Ndukwe, Armando Navarro‐Vázquez   +2 more
wiley   +1 more source

Sounding of the Atmosphere Using Broadband Emission Radiometry (SABER): Instrument and Science Measurement Description

Earth and Space Science, Volume 10, Issue 9, September 2023., 2023
Abstract SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) is a 10‐channel infrared radiometer that is one of four instruments on the NASA TIMED (Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics) satellite mission to study the structure, energetics, chemistry, and dynamics of the Earth's mesosphere and lower thermosphere.
Roy Esplin, Martin G. Mlynczak, James Russell, Larry Gordley, The SABER Team   +4 more
wiley   +1 more source

An Inter-phasing Stirling Pulse-tube Cryocooler without Reservoirs [PDF]

, 2015
Asubstantial fraction of the volume of a traditional pulse-tube cryocooler is occupied by a reservoir, which greatly reduces the specificpower of the cryocooler.
Zhu, J., Luo, E., Hu, J., Zhang, L., Wang, X., Li, H., Dai, W., Chen, S.   +7 more
core   +1 more source

A Comprehensive Review of Fault‐Current Limiter Technologies for Smart and Resilient Power Systems

Energy Science &Engineering, EarlyView.
This review compares superconducting, solid‐state, and hybrid fault‐current limiters (FCLs) for modern alternating current, direct current, and hybrid grids. It shows that optimal FCL selection depends on fault characteristics, network configuration, voltage level, protection coordination, and resilience requirements rather than on a universally ...
Abdelrahman Farghly, Eslam Essam, Hilmy Awad, Samia Abdelfatah, Walid Issa, Abdallah M. Hamada   +5 more
wiley   +1 more source