US3517228A - Magnetic piston - Google Patents

Magnetic piston Download PDF

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Publication number
US3517228A
US3517228A US767122A US3517228DA US3517228A US 3517228 A US3517228 A US 3517228A US 767122 A US767122 A US 767122A US 3517228D A US3517228D A US 3517228DA US 3517228 A US3517228 A US 3517228A
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US
United States
Prior art keywords
tube
cylinder
magnetic
along
magnetic piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US767122A
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English (en)
Inventor
Jiri George Linhart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
European Atomic Energy Community Euratom
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European Atomic Energy Community Euratom
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Filing date
Publication date
Application filed by European Atomic Energy Community Euratom filed Critical European Atomic Energy Community Euratom
Application granted granted Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N10/00—Electric motors using thermal effects
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/54—Plasma accelerators

Definitions

  • the present invention relates to a novel device for accelerating plasmoids or ymetal projectiles.
  • the device is based on the use of magnetic fields of confinement of cusp (pointed) type, whose end is propagated at high speed
  • the invention provides an accelerator for plasmoids or metallic projectiles comprising a tube of conductive material with a slot through itswalls extending from end to end, the edges of the slot being connected to -a current generator and a second tube within the first tube and spaced therefrom, the second tube also being of conductive material and having a cross-sectional material area which varies along the length ofthe tube.
  • the device according to the invention is characterised in that it provides a combination of a cylinder made of a conductive material which is slotted along la generatrix, the edges of the slot being connected to a current generator, and a second conductive cylinder whose wall thickness is not constant is disposed inside the first-mentioned cylinder coaxial therewith.
  • the Wall thickness of the second tube or cylinder progressively increases in the direction of propagation of the object to be accelerated.
  • FIG. 1 shows diagrammatically a prior art device
  • FIG. 2 is a section, taken along an axial plane, through one example of a magnetic piston according to the invention.
  • FIG. 3 is a transverse section through the piston shown in FIG. 2.
  • the device shown in FIG. 1 is a prior art LC circuit comprising inductances 1 in the form of coils disposed one after .the other in the direction of propagation vof the projectile to be accelerated, which passes axially inside the coils.
  • the coils 1 are supplied by capacitors 2, 3.
  • Switches 4, S complete the circuit, which can be used in various ways; 'j
  • FIGS.' The device according to the invention shown in FIGS.'
  • a resulting single-turn coil is connected at the edges of the slot viaa switch 8 to an accumulating device 9 which can be, for instance, a bank of capacitors, or any other known device.
  • FIG.2 V shows the device according to the invention when the front of the volatilization has reached the place 12.
  • the part of the tube 10 which has already disappeared is shown in chain lines, the remaining part being shown in solid lines.
  • the magnetic' field -B does not penetrate inside the cylinder 10, but the disappearance of the latter causes a sudden diffusion of the field into the space previously bounded by the cylinder 10, so that the lines of force 11 are curved very strongly inwards at the level of the disintegration front 12, so as to form a cusp type magnetic eld.
  • the cusp is propagated from left to right along the front 12, thus enabling, the projectiles to be accelerated at the speed at which the front is propagated.
  • the speed can beinfinite.
  • the invention is not limited to the embodiment thereof described hereinbefore, but covers all variants; for instance, the speed of displacement of the front 12 can be regulated by varying the development of fthe thickness of the sheet or tube 10. Another Iway of regulating the speed is to regulate the intensity of the magnetic field B.
  • An accelerator foi plasmoids or metallic projectiles comprising a tube of conductive material having a longi tudirral slot through its wall extending from end to end, means to apply current from a current generator to the edges of the slot to produce an axial flux therein, and a ,second tube within the first tube and spaced therefrom,
  • the second tube being of conductive material and having a cross-sectional area which varies along the length of the second tube, the dimensions of said second tube being such that it is heated by current induced therein by said flux until vaporization temperature is reached when it will commence to vaporize thereby forming a cusp-type mag netic field.
  • a magnetic piston for accelerating plasmoids or metal projectiles comprising, in combination, a cylinder of conductive material which is slotted along a generatrix, means for applying current from a current generator to the edges of said slot to produce an axial fiux in said cylin-l der, and a second cylinder of conductive material coaxially mounted withinl said first cylinder, said second cylinder having a wall thickness that increases along the length thereof and being so dimensioned that it is heated by current induced therein by said ux until vaporization temperature is reached when it will commence to vaporize progressively from its smallest thickness thereby forming a cusp-type magnetic field.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
  • Electromagnets (AREA)
US767122A 1967-11-28 1968-10-14 Magnetic piston Expired - Lifetime US3517228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE51423 1967-11-28

Publications (1)

Publication Number Publication Date
US3517228A true US3517228A (en) 1970-06-23

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Application Number Title Priority Date Filing Date
US767122A Expired - Lifetime US3517228A (en) 1967-11-28 1968-10-14 Magnetic piston

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US (1) US3517228A (en))
BE (1) BE707177A (en))
DE (1) DE1802756A1 (en))
FR (1) FR1593749A (en))
GB (1) GB1236985A (en))
LU (1) LU57303A1 (en))
NL (1) NL6812735A (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626218A (en) * 1970-12-31 1971-12-07 Nasa Shock wave convergence apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892114A (en) * 1958-05-06 1959-06-23 Wallace D Kilpatrick Continuous plasma generator
US3321664A (en) * 1964-08-10 1967-05-23 James A Phillips Plasma accelerator having rapidly pulsed coil for expelling plasma

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892114A (en) * 1958-05-06 1959-06-23 Wallace D Kilpatrick Continuous plasma generator
US3321664A (en) * 1964-08-10 1967-05-23 James A Phillips Plasma accelerator having rapidly pulsed coil for expelling plasma

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626218A (en) * 1970-12-31 1971-12-07 Nasa Shock wave convergence apparatus

Also Published As

Publication number Publication date
FR1593749A (en)) 1970-06-01
LU57303A1 (en)) 1969-02-25
NL6812735A (en)) 1969-05-30
BE707177A (en)) 1968-05-28
GB1236985A (en) 1971-06-23
DE1802756A1 (de) 1969-08-07

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