44 Result(s)
within
Chapter
S. W. Van Sciver
-
Chapter
Advances in Helium Cryogenics
This review provides a survey of major advances that have occurred in recent years in the area of helium cryogenics. Helium-temperature cryogenics is the enabling technology for a substantial and growing numbe...
-
Chapter
Optimal Integration of Binary Current Lead and Cryocooler
An optimal integration of a binary current lead and a two-stage cryocooler has been analytically sought to minimize the required refrigerator power. The binary current lead is a series combination of a normal ...
-
Chapter
Thin-Film Thermometer and Heater Design for the Detection and Generation of Second Sound Shock Pulses
Using a known heater design, and a common type of pencil lead graphite in a novel thermometer design, second sound shock (SSS) pulses comparable to those of previous researchers were successfully transmitted a...
-
Chapter
Numerical Study of Two-Phase Helium II Stratified Channel Flow
A key feature of the cryogenic system for the proposed TeV Superconducting Linear Accelerator (TESLA) is a He II two-phase flow line that provides cooling for the superconducting RF cavities. Understanding the...
-
Chapter
A Particle Seeding Apparatus for Cryogenic Flow Visualization
A particle seeding apparatus to create neutrally buoyant solid particles in liquid helium (He I and He II) has been developed and successfully tested as part of a flow visualization experiment. The apparatus c...
-
Chapter
Flow in Horizontal Two Phase He II /Vapor
Analytic and experimental studies of forced flow two phase He II and vapor in a horizontal channel are reported. A simple analytic model is presented that describes the steady state flow phenomena for both iso...
-
Chapter and Conference Paper
Recent Developments in HTS Technology at the National High Magnetic Field Laboratory
The National High Magnetic Field Laboratory (NHMFL) has established a program that supports development of high temperature superconductors to generate the highest magnetic fields possible. A near term goal is...
-
Chapter
He II Heat Transport in Cylindrical Geometry
Temperature difference measurements are presented for two different sized radius cylindrical heaters, r = 1.6 and 4.8 mm, and at different radial positions in the fluid adjacent to the heater. Previous measure...
-
Chapter
Measurement of the Pressure Distribution and Drag on a Sphere in Flowing Helium I and Helium II
We have designed and constructed an apparatus for measuring the pressure distribution around a sphere as a function of Reynolds number (mass flow rate) in both He I and He II. Liquid helium possesses kinematic...
-
Chapter
Effect of Heat Transfer on Cooling of Current Leads
Current leads supply electrical current to high-field superconducting magnets, operating at low temperatures. The heat leak flowing down the current lead must be intercepted and extracted. In the present work,...
-
Chapter
Liquid Level Control Using a Porous Plug in a Two-Phase He II System
This paper presents results of an experiment which decouples the liquid counterflow component from the evaporative component of heat transfer in the two-phase He II system. Two baths, partially filled with He ...
-
Chapter
Bi-2212 Coils for 1 T Class Insert Coils
We present the construction and in-field testing of three insert coils using Bi-2212 conductor with pure silver and alloyed silver stabilizer. We use a stacked double pancake configuration, where double pancak...
-
Chapter
Heat Transport in Saturated He II with Surface Heat Transfer in the Turbulent Counterflow Regime
Many large cryogenic systems provide refrigeration using pressurized He II that is cooled by a saturated bath heat exchanger. These heat exchangers consist of a closed-end tube or vessel filled with saturated ...
-
Chapter
Finite Element Code for Quench and Stability Analysis of Superconducting Magnets Cooled by He II
The design of the protection system for the superconducting portion of the 45-T Hybrid Magnet System being constructed at the National High Magnetic Field Laboratory and the establishment of safe and reliable ...
-
Chapter
New Calorimetric AC Loss Measurement Technique Involving Superfluid Heluim
We have developed a new calorimetric AC loss measurement facility involving superfluid helium (He II). At present, the Test of AC Loss (TACL) facility performs AC loss measurements on Cable-in-Conduit Conducto...
-
Chapter
HTS Coil and Joint Development for a 5T NMR Insert Coil
A HTS coil fabrication and joint development project was undertaken to develop the technology necessary for the production of a 5 T HTS insert coil for NMR applications. A series of minicoils are being fabrica...
-
Chapter
Design, Development and Testing of the JT Refrigerators For The 45-T Hybrid Magnet
The 45-T Hybrid Facility requires 1.8 K refrigeration for extended periods of time. The JT refrigeration system design is fully redundant to guarantee continuous cooling of the super-conducting magnet. Each re...
-
Chapter
Localized Heat Transfer to Vertical Forced Flow Two-Phase Helium
Localized heat transfer measurements in vertical two-phase helium are reported. The test loop contains two short heat transfer sections made of 5 mm thick oxygen-free high conductivity (OFHC) copper discs. The...
-
Chapter
A Continuously Cooled Mechanical Support for Cryogenic Equipment
A scheme is presented for interception of the heat flowing into a cryogenic environment, through its mechanical support. In the present method, the mechanical support is cooled continuously by means of a coola...
-
Chapter
Design, Development and Testing of the Cryogenic System for the 45-T Hybrid
The cryogenic system for the 45-T Hybrid superconducting magnet employs an innovative design primarily driven by the requirement that it be a user-friendly, reliable facility. To achieve this requirement, the ...
