US4290012A — Device for quantitative display of the current de…

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.

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

Device for quantitative display of the current density within a charged-particle beam

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