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Title: Ideal of the perfect magnet-superconducting systems

Abstract

In this report, we study an iron-free, superconducting, elliptical coil quadrupole which has been proposed by General Atomics for use in the SLC final focus system. Beth has shown that such coils might provide a pure quadrupole field ignoring 3-D effects. Similarly, recent studies of rare earth permanent magnets have shown that, at least in principle, these magnets can also be made arbitrarily pure. Since similar claims can be made for conventional iron-core electromagnets either by demanding pure hyperbolic pole contours or using tricks, it is interesting to consider just how wide the gulf between principle and practice really is for each type of magnet and what it takes to bridge it (and where one is most likely to fall off). Here we consider only the superconducting option because its greater strength, variability and linearity make it potentially useful for the SLC and the low-beta insertions of the high energy storage rings such as PEP.

Authors:
;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, CA (USA)
OSTI Identifier:
5964948
Report Number(s):
SLAC/AP-3
ON: DE83015080
DOE Contract Number:
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; STANFORD LINEAR COLLIDER; SUPERCONDUCTING MAGNETS; DESIGN; MAGNETIC FIELDS; QUADRUPOLES; ACCELERATOR FACILITIES; ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; LINEAR ACCELERATORS; MAGNETS; MULTIPOLES; SUPERCONDUCTING DEVICES; 430300* - Particle Accelerators- Auxiliaries & Components; 420201 - Engineering- Cryogenic Equipment & Devices

Citation Formats

Shoaee, H., and Spencer, J.E. Ideal of the perfect magnet-superconducting systems. United States: N. p., 1983. Web. doi:10.2172/5964948.
Shoaee, H., & Spencer, J.E. Ideal of the perfect magnet-superconducting systems. United States. doi:10.2172/5964948.
Shoaee, H., and Spencer, J.E. 1983. "Ideal of the perfect magnet-superconducting systems". United States. doi:10.2172/5964948. https://www.osti.gov/servlets/purl/5964948.
@article{osti_5964948,
title = {Ideal of the perfect magnet-superconducting systems},
author = {Shoaee, H. and Spencer, J.E.},
abstractNote = {In this report, we study an iron-free, superconducting, elliptical coil quadrupole which has been proposed by General Atomics for use in the SLC final focus system. Beth has shown that such coils might provide a pure quadrupole field ignoring 3-D effects. Similarly, recent studies of rare earth permanent magnets have shown that, at least in principle, these magnets can also be made arbitrarily pure. Since similar claims can be made for conventional iron-core electromagnets either by demanding pure hyperbolic pole contours or using tricks, it is interesting to consider just how wide the gulf between principle and practice really is for each type of magnet and what it takes to bridge it (and where one is most likely to fall off). Here we consider only the superconducting option because its greater strength, variability and linearity make it potentially useful for the SLC and the low-beta insertions of the high energy storage rings such as PEP.},
doi = {10.2172/5964948},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1983,
month = 4
}

Technical Report:

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  • The structural masses of over thirty superconducting magnet designs are shown to exceed that required by the virial theorem by factors of from two to ten or more. Designs for MHD and toroidal field (TF) fusion magnets from many different magnet groups around the world obey a stored energy-mass scaling law of the form E = CM4/3. This scaling law appears to be valid over three to four orders of magnitude of stored magnetic energy. The 4/3 power law differs from the linear scaling derived from the virial theorem and appears to result from the thermal stability requirements of themore » super-conductor. However, the masses of large scale TF magnets are approaching the regime where the structural mass required by the virial theorem will place greater constraints on the design than the thermal stability.« less
  • This report presents results of a study performed to compare airborne, high power supplies at power levels of 10 and 20 MW utilizing permanent magnet and superconducting generators. Algorithms for the weight and volume of these electrical generators are presented and algorithms for the other power supply components are used to predict total system weights for seven point designs at the two power levels.
  • An engineering-physics design study of magnets in various configurations is described. The types of magnets that have been considered are solenoids, two-dimensional dipole coils such as might be used for establishing MHD fields, and quadrupole magnets such as might be used for Joffe bars. Also, systems including combinations of these magnets have been calculated. The type of coil materials that have been evaluated include: room temperature copper magnets with appropriate cooling, cryogenic materials operating over a variety of cryogenic temperatures, and superconducting materials. In the case of superconductors, data are given for both stabilized and unstabilized materials. The theory ofmore » stabilization is presented in some detail. Coils having several current grades are considered and the effect of grading on reduction in coil weight and cost is given. Data are presented for dimensions, weight, cost, and refrigeration requirements, for each of these types over a range of central magnetic fields from 0 to 10 Wb/m/sup 2/. Optimization procedures are covered showing how the best conductor would be selected for minimum weight, or minimum cost. Large coils generate large electromagnetic forces. A considerable section is devoted to calculation of these forces, both within the coil and on external structural elements. Estimates of the weight of structure are given in terms of the coil dimensions, maximum field and stored energy. Finally, several examples of the use of the design charts and formulas are presented to familiarize the designer with the material.« less
  • The types of magnets that were considered are solenoids, two-dimensional dipole coils such as might be used for establishing MHD fields, and quadrupole magnets such as might be used for Joffe bars. Also, systems including combinations of these magnets were calculated. The type of coil materials that were evaluated include: room temperature copper magnets with appropriate colling, cryogenic materials operating over a variety of cryogenic temperatures, and superconducting materials. This volume contains 40 three-color charts, as double size foldouts, which are the illustrations accompanying Section I-C of Volume I of this report. These charts were prepared by computer and plottedmore » by automatic data curve plotting equipment directly from the computer output.« less