US4290012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for quantitative display of the current density within a charged-particle beam
Assignee: Thales SA
•
Filing: 1979-11-05
•
Granted: 1981-09-15
•
Expires: 1999-11-05
Abstract
Abstract The device for displaying the distribution of current density of a beam of electrically charged particles comprises a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam and m×n=q electrically conducting elements e which are fixed on the support plate in a lattice array of m lines and n columns. These elements e mn intercept portions of the beam and are each electrically connected to a system designed to process the electrical signals collected by said elements and to display the current density at m×n points of the beam cross-section.
Inventors
- 👤 Marc Berte
- 👤 Pierre Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:35
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A device for displaying the distribution of current density within a beam of electrically charged particles, said device comprising a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam, m×n=q electrically conducting elements fixed on the support plate being so arranged as to form a lattice of elements which consist of m lines and n columns and are intended to intercept the charged particles of the beam to a partial extent, said elements being electrically connected to systems which serve to process electrical signals collected by said elements and to display the density of the beam at m×n points of its cross-section, said device having a screen plate provided with m×n holes, said screen plate being placed above said support plate, each of said m×n holes being placed directly above one of said elements, said screen plate being of electrically insulating material.
Claim 2
Independent Claim
153 words
A device for displaying the distribution of current density within a beam of electrically charged particles, said device comprising a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam, m×n=q electrically conducting elements fixed on the support plate being so arranged as to form a lattice of elements which consist of m lines and n columns and are intended to intercept the charged particles of the beam to a partial extent, said elements being electrically connected to systems which serve to process electrical signals collected by said elements and to display the density of the beam at m×n points of its cross-section, said device having a screen plate provided with m×n holes, said screen plate being placed above said support plate, each of said m×n holes being placed directly above one of said elements, said screen plate being of electrically insulating material.
Claim 3
Independent Claim
165 words
A device for displaying the distribution of current density within a beam of electrically charged particles, said device comprising a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam, m×n=q electrically conducting elements fixed on the support plate being so arranged as to form a lattice of elements which consist of m lines and n columns and are intended to intercept the charged particles of the beam to a partial extent, said elements being electrically connected to systems which serve to process electrical signals collected by said elements and to display the density of the beam at m×n points of its cross-section, said device having a screen plate provided with m×n holes, said screen plate being placed above said support plate, each of said m×n holes being placed directly above one of said elements, said screen plate which is of electrically conducting material is positively biaised, said charged particle beam being an ion beam.
Claim 4
Independent Claim
165 words
A device for displaying the distribution of current density within a beam of electrically charged particles, said device comprising a support plate of electrically insulating material having a surface area at least equal to the cross-sectional area of the beam, m×n=q electrically conducting elements fixed on the support plate being so arranged as to form a lattice of elements which consist of m lines and n columns and are intended to intercept the charged particles of the beam to a partial extent, said elements being electrically connected to systems which serve to process electrical signals collected by said elements and to display the density of the beam at m×n points of its cross-section, said device having a screen plate provided with m×n holes, said screen plate being placed above said support plate, each of said m×n holes being placed directly above one of said elements, said screen plate which is of electrically conducting material is positively biaised, said charged particle beam being an ion beam.
Claim 5
Dependent Claim
80 words
A display device according to claims 1 or 2, wherein said system for processing said signal collected by each collecting element comprises: q differential amplifiers having two input connections and being associated respectively with said q elements delivering said signals s m ; one of said input connections being connected to one of said elements and the other input connecting being connected to a direct current voltage source delivering an adjustable voltage designed to be applied to said differential amplifiers.
Claim 6
Dependent Claim
187 words
A display device as claimed in claim 3, further comprising: a two-level multiplexing system constituted by multiplexers which deliver signals S mn ; an amplifier for delivering a signal S Y which is proportional to a composite signal S Ymn and intended to be injected into a channel Y of an oscilloscope; a time-base system which is controlled by a clock associated to four counters and generates drive pulses for controlling said multiplexing system; a divider associated to said clock and delivering two signals D S1 and D S2 ; a binary counter; a decoder designed to receive said signal D S2 ; a digital analog converter; an integrator for delivering a scanning signal S 2 by means of pulses delivered by said clock; an amplifier for delivering from a signal S 2 a signal S X which is intended to be projected into channel X of said oscilloscope; a blanking amplifier for modulating the amplitude of a signal S 3 delivered by said clock in order to produce a signal S Z which ensures scanning retrace blanking when injected into a channel Z of said oscilloscope.
References Cited (Backward Citations)
US3524998A
Cited
US3638111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |