A5064672394- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Nuclear Physics and Applications
- Spacecraft and Cryogenic Technologies
- Advanced X-ray and CT Imaging
- Particle Detector Development and Performance
- Iron-based superconductors research
- Force Microscopy Techniques and Applications
- Solid-state spectroscopy and crystallography
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Advanced Frequency and Time Standards
- Advanced X-ray Imaging Techniques
- Inorganic Chemistry and Materials
- Atomic and Subatomic Physics Research
- Magnetic Properties of Alloys
- X-ray Diffraction in Crystallography
- Diamond and Carbon-based Materials Research
- Superconductivity in MgB2 and Alloys
- Advanced Thermodynamic Systems and Engines
- Scientific Measurement and Uncertainty Evaluation
Argonne National Laboratory
2000-2025
Office of Scientific and Technical Information
2024
United States Department of Energy
2024
National Technical Information Service
2024
Geophysical Laboratory
2017
Fermi National Accelerator Laboratory
1981-1984
Abstract High-Pressure Collaborative Access Team (HPCAT) is a synchrotron-based facility located at the Advanced Photon Source (APS). With four online experimental stations and various offline capabilities, HPCAT focused on providing synchrotron x-ray capabilities for high pressure temperature research supporting broad user community. Overall, array of online/offline described, including some recent developments remote support concomitant impact current pandemic. General overview work done...
We report a comprehensive structural and valence study of the intermediate valent materials ${\mathrm{YbNiGa}}_{4}$ ${\mathrm{YbNiIn}}_{4}$ under pressures up to 60 GPa. undergoes smooth volume contraction shows steady increase in Yb with pressure, though reaches saturation around 25 In ${\mathrm{YbNiIn}}_{4}$, change pressure dependence peak suggest that pressure-induced electronic topological transition occurs 10--14 region where possess similar Yb-Yb spacings, reveals precipitous drop....
The diamond anvil cell (DAC) has been widely used in high-pressure research. Despite significant progress over the past five decades, opposed geometry DAC inevitably leads to a disk-shaped sample configuration at high pressure. This intrinsic limitation is largely responsible for large pressure and temperature gradients DAC, which often compromise precise experiments their characterizations. We designed fabricated multi-axis (MDAC) by adopting concept of multi-anvil apparatus but using...
We present theoretical and experimental studies of superconductivity low temperature structural phase boundaries in lithium. mapped the diagram 6Li 7Li under hydrostatic conditions between 5 top 55GPa within range 15 to 75K, observing FCC-hR1-cI16 transitions. show some differences at boundaries, with a potential shift lower pressures. Density functional theory calculations topological analysis electron density elucidates superconducting properties interatomic interactions these phases
The Tevatron transfer line consists of twenty-six 250-meter sections interconnected with vacuum jacketed U-tubes forming a loop. Each section carries supercritical helium and subcooled liquid nitrogen shield an expansion joint in the middle run. refrigeration system is based on concept Central Helium Liquefier providing to twentyfour satellite refrigerators operating as amplifiers flow gain 12 966 watts per unit. Both from standpoint reliability ease installation, debug startup, it was...
The Energy Saver Refrigeration System is based on the concept of a central helium liquefier (5000 l/hr) providing liquid to 24 satellite refrigerators (966 W at 4.6/degree/K), which operate as amplifiers with gain 12. This was tested, cooling two 125 m long strings superconducting magnets. test run using one refrigerator operating ''central liquefier'', shipping through 250 transfer line second refrigerator, in turn cooled In addition testing concept, heat loads magnets and were also...
The Advanced Photon Source (APS) storage ring vacuum chambers (SRVCs) are constructed of aluminum. chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an 6063-T5 extruded body. Vacuum connections the provided by 304 stainless steel flanges. To evaluate seal assemblies relative bake cycles, a conflat test assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature 150 degrees C on both assemblies. A Helicoflex (HBTA) similarly...
We have studied the Ce valence as a function of pressure in CeRhIn5 at 300 K and 22 using x-ray absorption spectroscopy partial fluorescent yield mode. At room temperature, we found no detectable change greater than 0.01 up to 5.5 GPa. K, remains robust against below 6 GPa, contrast predicted crossover P=2.35 This work yields an upper limit for Ce-valence suggests that critical fluctuation scenario, its current form, is unlikely.
The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for storage of 7-GeV positrons generation photon beams facility's materials research program. ring's 1104 m circumference is divided into 40 sectors which contain vacuum, beam transport, control, RF, and insertion device systems. vacuum system will operate pressure 1 nTorr fabricated from aluminum. includes distributed NeG pumping, absorbers with lumped...
The Tevatron magnets at Fermilab are cooled by a hybrid system which consists of 5000 liters/hr central helium liquefier coupled with small-diameter liquid transfer line connecting twenty-four satellite refrigerators. supplies for both the refrigerators and magnet lead flow as well nitrogen shields. satellites act amplifiers gain twelve using enthalpy supplied converting it to 4.5-K refrigeration then returning 300-K gas. This arrangement combines advantages single facility those individual...