US3582700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclotron beam extraction system
Assignee: CYCLOTRON BEAM ERTRACTION SYST
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Filing: 1968-11-12
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Granted: 1971-06-01
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Expires: 1988-11-12
Abstract
Abstract A method and apparatus for extracting a high-quality beam from an isochronous cyclotron by electrostatic deflection of a beam of charged particles from orbit and subsequent exposure of the beam within the evacuated region of the cyclotron to a reverse gradient in the normally declining fringe magnetic field.
Inventors
- 👤 George O Hendry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:27
CPC Classifications
H; H05; H05H; H05H7/00; H05H7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A method for extracting a beam of charged particles orbiting in an isochronous cyclotron within a guiding magnetic field and evacuated region comprising deflecting particles from orbit at an extraction radius near the fringe of said magnetic field by exposing them to an electrostatic field which increases in radius; and then within the fringe of said magnetic field and evacuated region exposing the deflected beam to a region of magnetic field having an increasing gradient to radially focus the beam of particles. 1The method the method of claim 1 including the further step of initially separating adjacent turns of said orbiting particles by creating coherent oscillation of the particles within the turn at said extraction radius having a maximum amplitude at about said radius.
Claim 2
Dependent Claim
82 words
Apparatus for extracting a beam of charged particles orbiting in an isochronous cyclotron within a guiding magnetic field and evacuated region comprising electrostatic deflection means defining, at an extraction radius near the fringe of said field, an electrostatic field which increases in radius to deflect particles from orbit; and magnetic channel means, within said evacuated region and receiving said beam of deflected particles, which develops a region of increasing gradient in the fringe of said magnetic field to focus said beam radially.
Claim 3
Dependent Claim
82 words
Apparatus for extracting a beam of charged particles orbiting in an isochronous cyclotron within a guiding magnetic field and evacuated region comprising electrostatic deflection means defining, at an extraction radius near the fringe of said field, an electrostatic field which increases in radius to deflect particles from orbit; and magnetic channel means, within said evacuated region and receiving said beam of deflected particles, which develops a region of increasing gradient in the fringe of said magnetic field to focus said beam radially.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 3 further comprising harmonic coil means creating coherent oscillation of the orbiting particles at said extraction radius with its maximum amplitude at the entrance to said electrostatic field.
Claim 5
Dependent Claim
37 words
The apparatus of claim 3 wherein the magnetic channel means comprises corresponding magnetic elements above and below the median plane of the cyclotron along a portion of the curved path of the beam within said median plane.
References Cited (Backward Citations)
US3024379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |