DESIGN OF A 300 000-Oe TWO-REGION SOLENOID FOR INTERMITTENT OPERATION

1964 ◽  
Vol 42 (7) ◽  
pp. 1343-1357 ◽  
Author(s):  
Richard Stevenson
Keyword(s):  
Magnetic Field ◽  
Cooling System ◽  
Operating Time ◽  
Maximum Power ◽  
Magnet System ◽  
Total Operating Time ◽  
Helium Gas ◽  
Intermittent Operation ◽  
The Magnetic Field ◽  
Capital Expense

This paper contains a design of an aluminum solenoid magnet system capable of producing a field of 300 000 Oe over a bore of 5.8 cm. The magnetic field is produced by a two-region solenoid operated at 15 °K and cooled by compressed helium gas. Details of the structure are described, and calculations are given for all important parts of the cooling system. The magnet is designed for a total operating time at maximum power of at least 40 minutes in a week. The low capital expense of the system makes it suitable for installation in small laboratories.

Development and Application of Multi-Modular Roll Magnetic Separator

2012 ◽  
Vol 472-475 ◽  
pp. 912-916
Author(s):  
Ding Guo Huang ◽  
Song Liu ◽  
Hong Guang Jiao ◽  
Fei Yue Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Economic Benefits ◽  
Magnet System ◽  
Magnetic Separator ◽  
Perfect Performance ◽  
One Machine ◽  
The Magnetic Field

This new dry magnetic separator has a special structure. It has many magnetic roll which are staggered like a stairsteps. It can finish the task of separating different minerals with only this one machine. And also it can make the different magnetic material which are in the same mineral separate at the same time. The permanent magnet system is made of large fan-shaped magnet. The magnet pole N and S are staggered and has perfect performance of magnetic separation. And the magnetic force is made full use by going-up dynamic separation. And also it gives an analysis of stress in the magnetic field. It also shows that its separation idex is better, the economic benefits are obvious, and it has broader prospects of popularization and application.

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.

A compact permanent-magnet system for measuring magnetic circular dichroism in resonant inelastic soft X-ray scattering

2017 ◽  
Vol 24 (2) ◽  
pp. 449-455 ◽  
Author(s):  
Jun Miyawaki ◽  
Shigemasa Suga ◽  
Hidenori Fujiwara ◽  
Hideharu Niwa ◽  
Hisao Kiuchi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Magnetic Circular Dichroism ◽  
X Rays ◽  
Magnet System ◽  
X Ray ◽  
X Ray Scattering ◽  
Magnetic Dichroism ◽  
The Magnetic Field ◽  
Ray Scattering

A compact and portable magnet system for measuring magnetic dichroism in resonant inelastic soft X-ray scattering (SX-RIXS) has been developed at the beamline BL07LSU in SPring-8. A magnetic circuit composed of Nd–Fe–B permanent magnets, which realised ∼0.25 T at the center of an 11 mm gap, was rotatable around the axis perpendicular to the X-ray scattering plane. Using the system, a SX-RIXS spectrum was obtained under the application of the magnetic field at an angle parallel, nearly 45° or perpendicular to the incident X-rays. A dedicated sample stage was also designed to be as compact as possible, making it possible to perform SX-RIXS measurements at arbitrary incident angles by rotating the sample stage in the gap between the magnetic poles. This system enables facile studies of magnetic dichroism in SX-RIXS for various experimental geometries of the sample and the magnetic field. A brief demonstration of the application is presented.

Comparative study of helical-cut notch–coil magnets for fast-field-cycling nuclear magnetic resonance

2014 ◽  
Vol 92 (11) ◽  
pp. 1430-1440 ◽  
Author(s):  
S. Kruber ◽  
G.D. Farrher ◽  
E. Anoardo
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnet System ◽  
Fast Switching ◽  
Magnetic Field Homogeneity ◽  
Field Cycling ◽  
Fast Field ◽  
The Magnetic Field ◽  
Nuclear Magnetic

In this manuscript we describe an α-helical-cut notch–coil magnet system designed for fast switching of the magnetic field. An attempt was made to determine the extent to which such a magnet configuration can be efficiently used for fast-field-cycling (FFC) nuclear magnetic resonance (NMR) instruments. In addition to the typical technical requirements (high field-to-power ratio, adequate electric performance for fast-switching of the magnetic field and NMR-compatible magnetic field homogeneity), a tunable homogeneity within the sample volume and more uniform heat dissipation along the magnet body are included. A helical-cut notch–coil machined in metallic cylinders with external movable pieces was found to fit these requirements very well. A key factor for the optimization of the magnet parameters is the use of a novel calculation procedure based on a more realistic model that consider a magnet geometry with broken azimuthal symmetry. The aim of this paper is to theoretically compare the proposed geometry with other existing designs. No particular prototype is presented here. A clear understanding of the notch–coil performance was found to be an essential step for its further consideration as a potential autoadaptive (electronically controlled) magnet system for FFC applications.

Design Optimization of Magnetic Fluid Cooling System

2012 ◽  
Author(s):  
J. Lee ◽  
T. Nomura ◽  
E. M. Dede
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Design Optimization ◽  
Magnetic Fluid ◽  
Heat Transfer Performance ◽  
Cooling System ◽  
Maximum Temperature ◽  
Transfer Performance ◽  
Field Source ◽  
The Magnetic Field

This paper introduces topology design optimization for a magnetically controlled convective heat transfer cooling system. It is well known that a stationary magnetic field subjected to a temperature gradient generates fluid motion in a magnetic fluid (e.g. ferrofluid). This physical phenomenon may be exploited to drive convective motion in the cooling system to maximize the heat transfer performance. Here, the magnetic field source layout of the system is designed to enhance the heat transfer performance. More specifically, the distribution and magnetization direction of the permanent magnet (PM) field source is optimized to minimize the maximum temperature of a closed loop heat transfer system. The design optimization is performed using a gradient-based topology optimization method with a fully coupled non-linear analysis for magnetic-thermal-fluid systems. Interestingly, magnet designs similar to Halbach arrays are obtained as the optimal PM layout. The magnetic field distribution generated by the designed layout affects the body force that the fluid is subjected to and results in unique fluid flow patterns for maximum cooling performance of the system. Thus, this paper will provide an explanation of the design optimization procedure and provide the design result.

scholarly journals Experimental analysis of magnetic field effects on compressor energy saving cooling system

2020 ◽  
Vol 170 ◽  
pp. 01020
Author(s):  
Rakesh Kumar Sidheshware ◽  
S Ganesan ◽  
Virendra K Bhojwani
Keyword(s):  
Magnetic Field ◽  
Energy Consumption ◽  
Field Strength ◽  
Experimental Analysis ◽  
Energy Savings ◽  
Cooling System ◽  
Energy Levels ◽  
Magnetic Field Effects ◽  
Refrigeration System ◽  
The Magnetic Field

A research on different refrigerants with and without influence of the magnetic field is provided in this paper. The magnetic field degree viz is four gauss. The condenser exit row was 3000, 6000, 9000 and 12000 gauss. Magnetic fields at condenser exit lines are found to reduce the consumption of the compressor energy. Through applying magnet fields on R134a, compressor energy savings was observed up to 1.35%, 6.23%, 5.40% and 4.19%, respectively, in gauss levels of 3000, 6000, 9000 and 12000, while R152a savings in energy levels were up 13.10%, 15.59% and 25.86% and R407a saving in power up to 7.3%, 9.19%, 13.05% and 12.40%. The coolant R152a saves energy in contrast to other coolant compressors. As the magnetic field strength increases, a vapor refrigeration system decreases the energy consumption of the compressor.

A feasibility study for high‐resolution silicon array detector performance in the magnetic field of a permanent magnet system

2019 ◽  
Vol 46 (9) ◽  
pp. 4224-4232 ◽  
Author(s):  
Sarah J. Alnaghy ◽  
Trent Causer ◽  
Maegan Gargett ◽  
Natalia Roberts ◽  
Marco Petasecca ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Permanent Magnet ◽  
Feasibility Study ◽  
Array Detector ◽  
Magnet System ◽  
Detector Performance ◽  
The Magnetic Field

scholarly journals Research on the effect of magnet parameters on the isochronous field of a superconducting cyclotron

2019 ◽  
Vol 34 (3) ◽  
pp. 222-230
Author(s):  
Pengyan Zhou ◽  
Kaizhong Ding ◽  
Junjun Li ◽  
Shiwen Xu ◽  
Yuntao Song
Keyword(s):  
Magnetic Field ◽  
Magnet System ◽  
Magnet Design ◽  
Superconducting Coil ◽  
Superconducting Cyclotron ◽  
Long Time ◽  
Sector Angle ◽  
Spiral Angle ◽  
The Magnetic Field ◽  
Complicated Task

It is a complicated task to obtain an isochronous field of a cyclotron magnet. Due to non-linear property of iron, iterated simulation of magnet design takes a long time to get an isochronous field. As an example, for a magnet design of a 240 MeV (SC240) superconducting cyclotron, the effect of main parameters of a magnet system on the magnetic field was studied, among them the azimuthal sector width, the spiral sector angle, the gap between sectors, the depth of valley region, the position of the coil, the shape of the coil and the excited current of the superconducting coil. It was found that the azimuthal average magnetic field can be increased by any of the following methods, including enlarging azimuthal width, increasing excited current of the superconducting coil, narrowing of the gap between sectors, reducing the depth of the valley region or decreasing the distance between the coil and the mid-plane. In addition, axial oscillation frequency can be improved by increasing the spiral angle, the depth of the valley region, or decreasing the gap between sectors.

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