RF device (1) able to generate an RF acceleration voltage in a synchrocyclotron. The device comprises a resonant cavity (2) formed by a grounded conducting enclosure (5) and enveloping a conducting pillar (3) to a first end of which an accelerating electrode (4) is linked. A rotary variable capacito
RF device (1) able to generate an RF acceleration voltage in a synchrocyclotron. The device comprises a resonant cavity (2) formed by a grounded conducting enclosure (5) and enveloping a conducting pillar (3) to a first end of which an accelerating electrode (4) is linked. A rotary variable capacitor (10) is mounted in the conducting enclosure at a second end of the pillar, opposite from the first end, comprising at least one fixed electrode (stator) (11) and a rotor (13) exhibiting a rotation shaft (14) supported and guided in rotation by galvanically isolating bearings (20), said rotor (13) comprising one moveable electrode (12) possibly facing the stator (11). When the shaft (14) rotates, the stator and the moveable electrode together form a variable capacitance whose value varies cyclically with time. The rotor (13) is galvanically isolated from the conducting enclosure (5) and from the pillar (3). The stator (11) is connected to the second end of the pillar (3) or to the conducting enclosure (5). The rotor is respectively coupled capacitively to the conducting enclosure or to the pillar. This makes it possible to dispense with sliding electrical contacts between the rotor and respectively the conducting enclosure or the pillar.
대표청구항▼
1. An RF device able to generate a voltage for accelerating charged particles in a synchrocyclotron, the RF device including a resonant cavity comprising: a conducting pillar of which a first end is linked to an accelerating electrode adapted to accelerate said particles;a conducting enclosure surro
1. An RF device able to generate a voltage for accelerating charged particles in a synchrocyclotron, the RF device including a resonant cavity comprising: a conducting pillar of which a first end is linked to an accelerating electrode adapted to accelerate said particles;a conducting enclosure surrounding the conducting pillar;a rotary variable capacitor mounted in the conducting enclosure and comprising on the one hand at least one fixed electrode linked galvanically to a second end of the conducting pillar, the second end being opposite from the first end, and on the other hand a rotor comprising at least one moveable electrode, the at least one fixed electrode and the at least one moveable electrode together forming a variable capacitance (Cv) able to cause a resonant frequency of the cavity to vary over time, the rotor being galvanically isolated from the conducting enclosure and from the conducting pillar, and the rotor being coupled capacitively to the conducting enclosure; andat least one bearing for supporting and guiding, in rotation, a shaft of the rotor, each of said bearings comprising a first race and a second race fixed to the shaft of the rotor;wherein each of said bearings is a galvanically isolating bearing. 2. The RF device of claim 1, wherein the bearings are magnetic bearings. 3. The RF device of claim 1, wherein each of the bearings comprises rolling elements between its first race and its second race, and in that at least one of the parts of each of the bearings out of its first race, its second race and the set of its rolling elements is made from an electrically insulating material. 4. The RF device of claim 3, wherein said electrically insulating material is a ceramic material. 5. The RF device of claim 3, wherein each rolling element is made of the electrically insulating material. 6. The RF device of claim 5, wherein said electrically insulating material is a ceramic material. 7. The RF device as claimed in claim 1, wherein the first race is fixed directly to the conducting enclosure or to the pillar. 8. The RF device of claim 1, wherein the synchrocyclotron comprises the RF device. 9. An RF device able to generate a voltage for accelerating charged particles in a synchrocyclotron, the RF device including a resonant cavity comprising: a conducting pillar of which a first end is linked to an accelerating electrode so as to accelerate said particles;a conducting enclosure surrounding the conducting pillar;a rotary variable capacitor mounted in the conducting enclosure and comprising on the one hand at least one fixed electrode linked galvanically to the conducting enclosure, and on the other hand a rotor comprising at least one moveable electrode, the at least one fixed electrode and the at least one moveable electrode together forming a variable capacitance (Cv) able to cause a resonant frequency of the cavity to vary over time, the rotor being galvanically isolated from the conducting enclosure and from the conducting pillar, and the rotor being coupled capacitively to a second end of the conducting pillar, the second end being opposite from the first end; andat least one bearing for supporting and guiding, in rotation, a shaft of the rotor, each of said bearings comprising a first race and a second race fixed to the shaft of the rotor;wherein each of said bearings is a galvanically isolating bearing. 10. The RF device of claim 9, wherein the bearings are magnetic bearings. 11. The RF device of claim 9, wherein each of the bearings comprises rolling elements between the first race and the second race, and in that at least one of the parts of the bearing from among the first race, the second race and the set of rolling elements is made from an electrically insulating material. 12. The RF device of claim 11, wherein said electrically insulating material is a ceramic material. 13. The RF device of claim 11, wherein each rolling element is made of the electrically insulating material. 14. The RF device of claim 13, wherein said electrically insulating material is a ceramic material. 15. The RF device of claim 9, wherein the first race is fixed directly to the conducting enclosure or to the pillar. 16. The RF device of claim 9, wherein the synchrocyclotron comprises the RF device.
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이 특허에 인용된 특허 (4)
Shoulders Kenneth R. (Austin TX), Energy conversion using high charge density.
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