Stepped gap achromatic bending magnet
First Claim
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1. A charged particle accelerator irradiation machine for irradiating an object comprising:
- (a) charged particle accelerator means for accelerating a beam of charged particles along a given axis,(b) a bending magnet system or bending said beam away from said axis through a deflection angle χ
with respect to said given axis, said bending magnet system comprising,(1) a first uniform magnetic field region and adjacent thereto, a second uniform magnetic field region, said magnetic fields of first and second region in the same direction, the magnetic field of said second region greater than the magnetic field in said first region, said first region comprising a first field boundary remote from said second region and said first and second regions comprising a second field boundary, said second field boundary forming a straight line,(2) means for injecting said beam of charged particles into said first region through said first boundary at an angle β
i with respect to said first boundary in the plane of deflection whereby said beam is deflected through an angle with respect to said first boundary in the plane of deflection whereby said beam is deflected through an angle α
1 in the deflection plane into said second region and thence through said second boundary at an angle β
2 therewith and again deflected through an angle 2 α
2 in said second region to again enter said first region whereby said beam is deflected through an additional angular interval α
1, and(3) means for extracting said beam from said first region.
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Abstract
A first order achromatic magnetic deflection system for use in conjunction with a charged particle accelerator, is realized from a stepped gap manget wherein a charged particle propagated through the system is subject to at least two adjacent homogenous magnetic fields in traversing one-half of a symmetric trajectory through the system.
66 Citations
12 Claims
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1. A charged particle accelerator irradiation machine for irradiating an object comprising:
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(a) charged particle accelerator means for accelerating a beam of charged particles along a given axis, (b) a bending magnet system or bending said beam away from said axis through a deflection angle χ
with respect to said given axis, said bending magnet system comprising,(1) a first uniform magnetic field region and adjacent thereto, a second uniform magnetic field region, said magnetic fields of first and second region in the same direction, the magnetic field of said second region greater than the magnetic field in said first region, said first region comprising a first field boundary remote from said second region and said first and second regions comprising a second field boundary, said second field boundary forming a straight line, (2) means for injecting said beam of charged particles into said first region through said first boundary at an angle β
i with respect to said first boundary in the plane of deflection whereby said beam is deflected through an angle with respect to said first boundary in the plane of deflection whereby said beam is deflected through an angle α
1 in the deflection plane into said second region and thence through said second boundary at an angle β
2 therewith and again deflected through an angle 2 α
2 in said second region to again enter said first region whereby said beam is deflected through an additional angular interval α
1, and(3) means for extracting said beam from said first region. - View Dependent Claims (2, 3, 4, 5)
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6. A first order achromatic deflection system for deflecting charged particles through a deflection angle χ
- comprising;
polepiece means comprising first and second pole caps disposed about a median plane for establishing at least contiguous first and second magnetic field regions, each said magnetic field region comprising a substantially homogeneous field. - View Dependent Claims (7, 8, 9, 10, 11, 12)
- comprising;
Specification