scholarly journals A HELIUM RE-LIQUEFIER FOR RECOVERING AND LIQUEFYING HELIUM VAPOR FROM CRYOSTAT

2010 ◽  
Author(s):  
C. Wang ◽  
J. G. Weisend
Keyword(s):  
Helium Vapor

Multiply charged droplets in helium vapor

1984 ◽  
Vol 57 (5-6) ◽  
pp. 539-547 ◽  
Author(s):  
Gary A. Williams ◽  
Martti M. Salomaa
Keyword(s):  
Charged Droplets ◽  
Multiply Charged ◽  
Helium Vapor

scholarly journals Boiling of He-II on a cylindrical heater inside a porous shell with constant operation condition

2021 ◽  
Vol 2057 (1) ◽  
pp. 012055
Author(s):  
P V Korolyov ◽  
I A Yachevsky ◽  
I V Volodin
Keyword(s):  
Vapor Pressure ◽  
Superfluid Helium ◽  
Film Boiling ◽  
Vacuum System ◽  
Experimental Setup ◽  
Operation Condition ◽  
Helium Ii ◽  
Porous Shell ◽  
Constant Operation ◽  
Helium Vapor

Abstract This paper presents new efforts undertaken in the study of boiling in superfluid helium on the surface of a cylindrical heater located along the axis in a cylindrical cavity inside a porous shell. New experimental results are obtained with maintaining constant temperature of the helium-II and helium vapor pressure. The modernization of the experimental setup and vacuum system carried out to obtain a series of longer experiments with maintaining a stationary state are described. The basic experimental configurations are specified. Visualization of helium-II film boiling in constant operation condition is represented.

Liquid Helium Vapor Pressure Equation

1955 ◽  
Vol 100 (2) ◽  
pp. 743-744 ◽  
Author(s):  
J. R. Clement ◽  
J. K. Logan ◽  
J. Gaffney
Keyword(s):  
Vapor Pressure ◽  
Liquid Helium ◽  
Pressure Equation ◽  
Vapor Pressure Equation ◽  
Helium Vapor

Observations from the Analyses of Magnetic Field and AC Loss Distributions in the NHMFL 32 T All-Superconducting Magnet HTS Insert

2013 ◽  
Vol 23 (3) ◽  
pp. 4300704-4300704 ◽  
Author(s):  
Andrew Gavrilin ◽  
Jun Lu ◽  
Hongyu Bai ◽  
David Hilton ◽  
W Markiewicz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Superconducting Magnet ◽  
Coated Conductors ◽  
Ac Loss ◽  
Ac Losses ◽  
Magnet System ◽  
Field Gradients ◽  
The Magnetic Field ◽  
Helium Vapor

A 17 T high-temperature superconducting two-coil magnet (insert) to be operated in a 15 T low-temperature superconducting multisection magnet (outsert) is the most demanding part of the National High Magnetic Field Laboratory all-superconducting 32 T magnet system. The HTS coils are of the pancake type and to be wound with REBCO coated conductors/tapes manufactured by SuperPower, Inc. The distribution of AC losses in the HTS windings during the magnet charging/discharging process are computed and analyzed with due regard for the AC loss density dependence on the magnetic field and the field angle. The calculations are based on the measured magnetization of a representative sample against magnetic field and field angle. The results enable determination of heat load on the magnet and its cryogenic system. Since the magnet is of the pool-cooled type, a related helium vapor bubble problem can develop owing to the high field and field gradients, and the diamagnetic susceptibility of helium.

Two Developments - A Superconducting Microscope Conversion and A Precision High Voltage Divider

1970 ◽  
Vol 28 ◽  
pp. 354-355
Author(s):  
R. E. Worsham ◽  
J. E. Mann ◽  
E. G. Richardson ◽  
N. F. Ziegler
Keyword(s):  
High Resolution ◽  
Liquid Helium ◽  
High Voltage ◽  
Experimental Evaluation ◽  
Voltage Divider ◽  
Bottom Plate ◽  
Objective Lens ◽  
Optical Bench ◽  
Radiation Shields ◽  
Helium Vapor

Two elements in the chain of development for a 500 kV high resolution microscope have been completed for initial experimental evaluation. They are a conversion of a Siemens Elmiskop I to use a superconducting objective lens and a 150 kV precisely regulated accelerating supply.The superconducting microscope, shown in Fig. 2 is designed as an optical bench for proving the cryostat, lenses, stage mechanism, and other parts prior to the design of a superconducting column for 500 keV. The lens as shown in Figs. 1 and 2 mounts on the removable bottom plate of the 7-liter helium vessel. The vessel is supported and can be clamped rigidly by the four sets of G-10 epoxy-glass posts. Radiation Shields I and II are concentric with the helium vessel. They are cooled by the boil-off helium vapor to about 30 and 130°K, respectively. All electrical leads are carried into the helium vessel through the four symmetrically located vents. Cooldowns from 77°K requires about 30 liters of liquid helium and the boil-off rate is 0.3-0.5 1/HR at either 4.2 or ∼ 1.8°K.

Sign in / Sign up

Export Citation Format

Share Document