30 results about "Synchrocyclotron" patented technology

A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions. The programmable waveform generator can adjust at least one of the oscillating voltage input, the voltage on the injection electrode and the voltage on the extraction electrode according to beam intensity and in response to changes in resonant conditions.

The invention discloses a synchrocyclotron and a method for matching a high-intensity magnetic field thereof with a high-frequency frequency modulation curve, belongs to the field of particle cyclotron acceleration, and solves the problem that the magnetic field distribution of a flat magnetic pole does not match the high-frequency frequency modulation curve. The synchrocyclotron mainly includes amain magnet. The two magnetic pole faces with opposite magnetic poles of the main magnet are curved surfaces. The two magnetic poles are disposed centrally symmetrically. The method, based on the fine adjustment of an ideal frequency curve by the compensation of a high-intensity magnetic field and the large-range modulation of the high-frequency frequency curve by a rotary capacitor, repeatedly performs iteration to realize the optimum matching of the high-intensity magnetic field and the high-frequency frequency modulation curve, thereby ensuring the stability of the longitudinal phase spaceacceptance during an acceleration process, minimizing the beam loss in the synchrocyclotron and achieving a low level of excitation.

The present invention relates to an RF system (1) able to generate a voltage for accelerating charged particles in a synchrocyclotron, the RF system (1) including a resonant cavity (2) comprising a conducting enclosure (5) within which are placed a conducting pillar (3) of which a first end is linked to an accelerating electrode (4) able to accelerate the charged particles, a rotary variable capacitor (10) coupled between a second end opposite from the first end of the pillar (3) and the conducting enclosure (5), the said capacitor (10) comprising fixed electrodes (11) and a rotor (13) comprising mobile electrodes (12), the fixed electrodes (11) and the mobile electrodes (12) forming a variable capacitance able to vary a resonant frequency of the resonant cavity (2) in a cyclic manner over time, an exterior layer of the rotor (13) having a conductivity of greater than 20,000,000 S / m at 300 K. At least one part of the exterior surface (15) of the rotor (13) is a surface possessing a normal total emissivity of greater than 0.5 and less than 1, thereby allowing better cooling of the rotor and / or making it possible to dispense with a system for cooling the rotor by conduction and / or by convection.