System for producing high energy positively charged particles

Claim 3

The method of claim 1 wherein the step of velocity bunching the migrating ions includes applying a periodic radio frequency field to said migrating negative ions outside of the magnetic guide field which is locked in phase with the periodic radio frequency electric field produced within the evacuated accleration region.

Claim 4

The method of claim 1 wherein the step of deflecting the migrating negative ions into the median plane includes exposing said migrating ions at their incidence upon said median plane to a plane positive electrostatic deflection field inclined 42 1/2 * with respect to said median plane.

Claim 5

The method of claim 3 wherein the migrating negative ions are sequentially focused in a beam prior to deflection by a plurality of separately controlled electrostatic focusing fields.

Claim 6

The method of claim 1 wherein the step of electrostatically deflecting accelerated negative ions from orbit includes defining a positive electrostatic deflection field of increasing radius at said extraction radius, and intercepting said accelerated negative ions with said positive electrostatic deflection field.

Claim 7

In a method for producing a beam of high energy positive ions by linearly accelerating a beam of energetic negative ions at a first energy level to a higher second energy level, stripping the negative charge from the negative ions to produce positive ions, and then linearly accelerating the positive ions to a still higher third energy Level, the improvement of supplying said beam of energetic negative ions at said first energy level by the steps of forming a magnetic guide field; defining an evacuated acceleration region having a median plane within and perpendicular to said magnetic guide field; producing within said evacuated acceleration region a periodic radio frequency electric field with which, in combination with said magnetic guide field, to accelerate ions on said median plane in orbits increasing in radius from the center of said evacuated region to an extraction radius; producing a plurality of randomly charged ions outside of said guide field; separating negative ions from the others of said randomly charged ions and migrating them in a direction parallel to said guide field to the center of said evacuated region; velocity bunching the migrating negative ions in phase relationship to said radio frequency electric field; deflecting the migrating and velocity bunched negative ions at the center of said evacuated region into the median plane of said orbits; accelerating said negative ions from said center to said extraction radius; and electrostatically deflecting accelerated negative ions from orbit at said extraction radius in a linear beam at said first energy level.

Claim 8

In a method for producing a beam of high energy positive ions by linearly accelerating a beam of energetic negative ions at a first energy level to a higher second energy level, stripping the negative charge from the negative ions to produce positive ions, and then linearly accelerating the positive ions to a still higher third energy Level, the improvement of supplying said beam of energetic negative ions at said first energy level by the steps of forming a magnetic guide field; defining an evacuated acceleration region having a median plane within and perpendicular to said magnetic guide field; producing within said evacuated acceleration region a periodic radio frequency electric field with which, in combination with said magnetic guide field, to accelerate ions on said median plane in orbits increasing in radius from the center of said evacuated region to an extraction radius; producing a plurality of randomly charged ions outside of said guide field; separating negative ions from the others of said randomly charged ions and migrating them in a direction parallel to said guide field to the center of said evacuated region; velocity bunching the migrating negative ions in phase relationship to said radio frequency electric field; deflecting the migrating and velocity bunched negative ions at the center of said evacuated region into the median plane of said orbits; accelerating said negative ions from said center to said extraction radius; and electrostatically deflecting accelerated negative ions from orbit at said extraction radius in a linear beam at said first energy level.

Claim 9

The method of claim 6 wherein the step of velocity bunching the migrating ions includes applying a periodic radio frequency field to said migrating negative ions outside of the magnetic guide field which is locked in phase with the periodic radio frequency electric field produced within the evacuated acceleration region.

Claim 10

The method of claim 6 wherein the step of deflecting the migrating negative ions into the median plane includes exposing said migrating ions at their incidence upon said median plane to a plane positive electrostatic deflection field inclined 42 1/2 * with respect to said median plane.

Claim 11

The method of claim 8 wherein the migrating negative ions are sequentially focused in a beam prior to deflection by a plurality of separately controlled electrostatic focusing fields.

Claim 12

The method of claim 6 wherein the step of electrostatically deflecting accelerated negative ions from orbit includes defining a positive electrostatic deflection field of increasing radius at said extraction radius and intercepting said accelerated negative ions with said positive electrostatic deflection field.

Claim 13

Apparatus for producing a beam of high energy positive ions including means defining a magnetic guide field; means defining an evacuated acceleration region having a median plane within and perpendicular to said magnetic guide field; acceleration means producing within said evacuated acceleration region a periodic radio frequency electric field with which, in combination with said magnetic guide field, to accelerate ions on said median plane in orbits increasing in radius from the center of said evacuated region to an extraction radius; an ion source producing a plurality of randomly charged ions outside of said guide field; means separating negative ions from the others of said randomly charged ions and migrating them in a direction parallel to said guide field to the center of said evacuated region; means velocity bunching negative ions migrating from said ion source in phase relationship to said radio frequency electric field; means deflecting the migrating and velocity bunched negative ions into the median plane of said orbits at the center of said evacuated region; electrostatic means deflecting accelerated negative ions from orbit at said extraction radius in linear liner beam at a first energy level; and an electrostatic linear accelerator accelerating the negative ions in said beam to a higher second energy level, stripping the negative charge from said negative ions to produce positive ions, and then accelerating said positive ions to a still higher third energy level.

Claim 14

Apparatus for producing a beam of high energy positive ions including means defining a magnetic guide field; means defining an evacuated acceleration region having a median plane within and perpendicular to said magnetic guide field; acceleration means producing within said evacuated acceleration region a periodic radio frequency electric field with which, in combination with said magnetic guide field, to accelerate ions on said median plane in orbits increasing in radius from the center of said evacuated region to an extraction radius; an ion source producing a plurality of randomly charged ions outside of said guide field; means separating negative ions from the others of said randomly charged ions and migrating them in a direction parallel to said guide field to the center of said evacuated region; means velocity bunching negative ions migrating from said ion source in phase relationship to said radio frequency electric field; means deflecting the migrating and velocity bunched negative ions into the median plane of said orbits at the center of said evacuated region; electrostatic means deflecting accelerated negative ions from orbit at said extraction radius in linear liner beam at a first energy level; and an electrostatic linear accelerator accelerating the negative ions in said beam to a higher second energy level, stripping the negative charge from said negative ions to produce positive ions, and then accelerating said positive ions to a still higher third energy level.

Claim 15

The apparatus Of claim 11 wherein the means velocity bunching the migrating negative ions includes a pair of grids spaced along the path of said ions outside the magnetic guide field, and means applying a periodic radio frequency field to said grids which is locked in phase with the periodic radio frequency electric field within the evacuated acceleration region.

Claim 16

The apparatus of claim 11 wherein the means deflecting the migrating ions into the median plane comprise a highly positively charged inflector electrode having a plane face at said median plane and inclined 42 1/2 * with respect to said median plane; a grounded mesh plane parallel to said electrode face and spaced from it toward the incident migrating ions.

Claim 17

The apparatus of claim 13 wherein a series of separately controlled electrostatic lenses focuses the migrating ions in a beam incident upon the inclined inflection field defined between said inflector electrode face and said grounded mesh plane.

Claim 18

The apparatus of claim 11 wherein the means deflecting accelerated negative ions from orbit comprises means defining an electrostatic channel of increasing radius which intercepts said accelerated negative ions at the extraction radius, including a grounded septum and a positively charged deflector bar spaced from it and producing a positive steady electric field across said channel; support means for said deflector bar; means insulating said support means from ground potential; grounded shielding means for defining uniformly falling electric fields from and in the vicinity of said deflector bar support means and insulating means and for isolating them from extraneous electrons within the evacuated acceleration region; and electron dumps protruding from said support means for collecting and discharging extraneous electrons that are attracted to said deflector bar and support means.