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Title: Fast superconducting magnetic field switch

Abstract

The superconducting magnetic switch or fast kicker magnet is employed with electron stream or a bunch of electrons to rapidly change the direction of flow of the electron stream or bunch of electrons. The apparatus employs a beam tube which is coated with a film of superconducting material. The tube is cooled to a temperature below the superconducting transition temperature and is subjected to a constant magnetic field which is produced by an external dc magnet. The magnetic field produced by the dc magnet is less than the critical field for the superconducting material, thus, creating a Meissner Effect condition. A controllable fast electromagnet is used to provide a magnetic field which supplements that of the dc magnet so that when the fast magnet is energized the combined magnetic field is now greater that the critical field and the superconducting material returns to its normal state allowing the magnetic field to penetrate the tube. This produces an internal field which effects the direction of motion and of the electron stream or electron bunch. The switch can also operate as a switching mechanism for charged particles.

Inventors:
 [1];  [2]
  1. (Mountain View, CA)
  2. (The Woodlands, TX)
Publication Date:
Research Org.:
WESTINGHOUSE IDAHO NUCLEAR CO
OSTI Identifier:
870546
Patent Number(s):
US 5543769
Assignee:
United States of America as represented by Department of Energy (Washington, DC) INEEL
DOE Contract Number:
AC07-84ID12435
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
fast; superconducting; magnetic; field; switch; kicker; magnet; employed; electron; stream; bunch; electrons; rapidly; change; direction; flow; apparatus; employs; beam; tube; coated; film; material; cooled; temperature; below; transition; subjected; constant; produced; external; dc; critical; creating; meissner; effect; condition; controllable; electromagnet; provide; supplements; energized; combined; returns; normal; allowing; penetrate; produces; internal; effects; motion; operate; switching; mechanism; charged; particles; apparatus employs; electron stream; superconducting magnet; magnetic switch; conducting material; field produced; temperature below; charged particles; magnetic field; charged particle; superconducting material; superconducting magnetic; transition temperature; superconducting transition; electron bunch; critical field; constant magnetic; dc magnet; /335/313/

Citation Formats

Goren, Yehuda, and Mahale, Narayan K. Fast superconducting magnetic field switch. United States: N. p., 1996. Web.
Goren, Yehuda, & Mahale, Narayan K. Fast superconducting magnetic field switch. United States.
Goren, Yehuda, and Mahale, Narayan K. 1996. "Fast superconducting magnetic field switch". United States. doi:. https://www.osti.gov/servlets/purl/870546.
@article{osti_870546,
title = {Fast superconducting magnetic field switch},
author = {Goren, Yehuda and Mahale, Narayan K.},
abstractNote = {The superconducting magnetic switch or fast kicker magnet is employed with electron stream or a bunch of electrons to rapidly change the direction of flow of the electron stream or bunch of electrons. The apparatus employs a beam tube which is coated with a film of superconducting material. The tube is cooled to a temperature below the superconducting transition temperature and is subjected to a constant magnetic field which is produced by an external dc magnet. The magnetic field produced by the dc magnet is less than the critical field for the superconducting material, thus, creating a Meissner Effect condition. A controllable fast electromagnet is used to provide a magnetic field which supplements that of the dc magnet so that when the fast magnet is energized the combined magnetic field is now greater that the critical field and the superconducting material returns to its normal state allowing the magnetic field to penetrate the tube. This produces an internal field which effects the direction of motion and of the electron stream or electron bunch. The switch can also operate as a switching mechanism for charged particles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month = 1
}

Patent:

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  • The superconducting magnetic switch or fast kicker magnet is employed with electron stream or a bunch of electrons to rapidly change the direction of flow of the electron stream or bunch of electrons. The apparatus employs a beam tube which is coated with a film of superconducting material. The tube is cooled to a temperature below the superconducting transition temperature and is subjected to a constant magnetic field which is produced by an external dc magnet. The magnetic field produced by the dc magnet is less than the critical field for the superconducting material, thus, creating a Meissner Effect condition.more » A controllable fast electromagnet is used to provide a magnetic field which supplements that of the dc magnet so that when the fast magnet is energized the combined magnetic field is now greater that the critical field and the superconducting material returns to its normal state allowing the magnetic field to penetrate the tube. This produces an internal field which effects the direction of motion and of the electron stream or electron bunch. The switch can also operate as a switching mechanism for charged particles. 6 figs.« less
  • The superconducting magnetic switch or fast kicker magnet is employed with an electron stream or a bunch of electrons to rapidly change the direction of flow of the electron stream or bunch of electrons. The apparatus employs a beam tube which is coated with a film of superconducting material. The tube is cooled to a temperature below the superconducting transition temperature and is subjected to a constant magnetic field which is produced by an external dc magnet. The magnetic field produced by the dc magnet is less than the critical field for the superconducting material, thus, creating a Meissner Effectmore » condition. A controllable fast electromagnet is used to provide a magnetic field which supplements that of the dc magnet so that when the fast magnet is energized the combined magnetic field is now greater than the critical field and the superconducting material returns to its normal state allowing the magnetic field to penetrate the tube. This produces an internal field which effects the direction of motion and of the electron stream or electron bunch. The switch can also operate as a switching mechanism for charged particles. Magnetic switches and particularly fast kicker magnets are used in the accelerator industry to quickly deflect particle beams into and out of various transport lines, storage rings, dumps, and specifically to differentially route individual bunches of particles from a train of bunches which are injected or ejected from a given ring.« less
  • A radio frequency-assisted fast superconducting switch is described. A superconductor is closely coupled to a radio frequency (RF) coil. To turn the switch "off," i.e., to induce a transition to the normal, resistive state in the superconductor, a voltage burst is applied to the RF coil. This voltage burst is sufficient to induce a current in the coupled superconductor. The combination of the induced current with any other direct current flowing through the superconductor is sufficient to exceed the critical current of the superconductor at the operating temperature, inducing a transition to the normal, resistive state. A by-pass MOSFET maymore » be configured in parallel with the superconductor to act as a current shunt, allowing the voltage across the superconductor to drop below a certain value, at which time the superconductor undergoes a transition to the superconducting state and the switch is reset.« less
  • A superconducting magnet containing at least one coil made of an alloy having superconductivity at a temperature below its critical temperature is described. The alloy consists essentially of about 20 to 63 at. percent niobium, about 1 to 79 at. percent zirconium and about 1 to 79 percent titanium. The superconducting alloys find application in superconducting magnets for magnetic hydrodynamic generators and in coils for magnets which provide the driving force in submarines.
  • Method and equipment for transferring energy to or from a direct-current superconducting field coil to change the magnetic field generated by the coil in which a second direct-current superconducting coil is used as a storage coil, and energy transfer between the field coil and the storage coil is effected automatically in dependence upon a control program. Preferably, the control program acts upon a variable transformer which is coupled by respective rectifier/inverters to the field and storage coils and also serves for intital supply of energy to the coils.