Compact isochronal cyclotron
First Claim
1. A compact isochronal cyclotron in which the particle beam is focused by sectors, comprising an electromagnet having two poles, said poles defining a mid-plane and constituting a magnetic circuit which includes at least three pairs of sectors (3 and 3'"'"') called "hills" where the air gap is reduced, these being separated by spaces in the form of sectors (4) called "valleys" where the air gap has a greater dimension and which is energized by at least one pair of main circular coils (6) surrounding the poles of the electromagnet, this cyclotron being characterized in that the air gap (8) located between the two hills (3 and 3'"'"') has an essentially elliptical changing profile which tends towards complete closure at the radial extremity of the hills, called the hill radius (Rc), on the mid-plane (10).
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Abstract
A superconducting or non-superconducting compact isochronic cyclotron in which the particle beam is sectorally focused. The cyclotron comprising a solenoid forming a magnetic circuit which is energized by at least one pair of circular main coils surrounding the solenoid poles. The magnetic circuit includes at least three pairs of sectors known as "hills", where the air gap is reduced, separated by sector-shaped spaces known as "valleys", where the air gap is larger. The air gap between the hills has a substantially elliptical curved profile which completely closes off the radial end of the hills at the center plane.
72 Citations
20 Claims
- 1. A compact isochronal cyclotron in which the particle beam is focused by sectors, comprising an electromagnet having two poles, said poles defining a mid-plane and constituting a magnetic circuit which includes at least three pairs of sectors (3 and 3'"'"') called "hills" where the air gap is reduced, these being separated by spaces in the form of sectors (4) called "valleys" where the air gap has a greater dimension and which is energized by at least one pair of main circular coils (6) surrounding the poles of the electromagnet, this cyclotron being characterized in that the air gap (8) located between the two hills (3 and 3'"'"') has an essentially elliptical changing profile which tends towards complete closure at the radial extremity of the hills, called the hill radius (Rc), on the mid-plane (10).
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8. A method for accelerating protons to an energy greater than 150 MeV comprising subjecting the protons to a magnetic field provided by a magnetic circuit which includes at least three pairs of sectors (3 and 3'"'"') called "hills" where the air gap is reduced, these being separated by spaces in the form of sectors (4) called "valleys" where the air gap has a greater dimension and which is energized by at least one pair of main circular coils (6) surrounding the poles of the electromagnet, said poles defining a mid-plane, this cyclotron being characterized in that the air gap (8) located between two hills (3 and 3'"'"') has an essentially elliptical changing profile which tends towards complete closure at the radial extremity of the hills, called the hill radius (Rc), on the mid-plane (10).
Specification