# US 4,398,090 A · Panoramic ion detector

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- Number: US 4,398,090 A
- Document ID: US4398090A
- Status: Granted
- Kind: A
- Application number: 06/310,995
- Filed: 1981-10-13
- Granted: 1983-08-09
- Earliest claimed: 1977-11-15
- Assignees: Commissariat a l'Energie Atomique; Gesellschaft fur Strahlen- und Umweltforschung mbH
- Inventors: Jean-Francois Eloy; Eberhard Unsold
- Web page: https://patentgrep.com/patent/US4398090A

## CPC

- H01J 49/025: {Detectors specially adapted to particle spectrometers (data acquisition H01J49/0036; detectors per se G01T, e.g. G01T1/28, G01T1/29)}
- G01T 1/28: with secondary-emission detectors
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

Panoramic detector of ions spatially distributed in different beams, comprising a plane symmetry diaphragm having an opening permitting the passage of the beams and which is brought to earth potential, an electrode for converting ions into electrons having an opening facing the diaphragm opening, the conversion electrode having the same plane of plane symmetry and being brought to a negative potential relative to the earth potential, and a planar electrode facing the conversion electrode and brought to a positive potential relative to the potential of the conversion electrode, the face of the conversion electrode facing the planar electrode having a predetermined shape in such a way that the electron beams formed retain the same spatial distribution as the beams of ion to be detected in the presence of an applied magnetic field.

## Claims

### Claim 1

A panoramic detector of ions spatially distributed in different beams, comprising a plane symmetry diaphragm having an elongated opening permitting the passage of said beams and being at earth potential, a conversion electrode for converting ions into electrons having an opening facing the diaphragm opening, said conversion electrode having the same plane of symmetry as said diaphragm and being at a negative potential relative to the earth potential, and a planar electrode facing the conversion electrode and being at a positive potential relative to the potential of the conversion electrode, the face of the conversion electrode facing the planar electrode having a predetermined shape in such a way that the electron beams formed retain the same spatial distribution as the beams of ion to be detected in the presence of an applied magnetic field.

### Claim 2 (depends on 1)

A detector according to claim 1, wherein the conversion electrode is made from a copper--beryllium alloy.

### Claim 3 (depends on 1)

A detector according to claim 1 including means for the differential treatment of electron beams emitted in different zones of said conversion electrode juxtaposed along the direction of the plane of symmetry, said means including a scintillator and a plurality of light guides, each associated with a different zone of said scintillator juxtaposed along the direction of the plane of symmetry.

### Claim 4 (depends on 3)

A detector according to claim 3, wherein said treatment means also comprise a plurality of photomultipliers, each of which is associated with one of the light guides.

### Claim 5 (depends on 1)

A detector according to claim 1, comprising means for the time treatment of the electrooptical signals emitted by the conversion electrode.

### Claim 6 (depends on 5)

A detector according to claim 5, wherein said treatment means comprise a scintillator and a light guide associated with the scintillator assembly.

### Claim 7 (depends on 5)

A detector according to claim 5, wherein said treatment means comprise at least one photomultiplier associated with said light guide.