Programmable radio frequency waveform generatior for a synchrocyclotron
First Claim
1. A synchrocyclotron comprising:
- a magnetic field generator;
a resonant circuit, comprising;
electrodes, disposed between magnetic poles, having a gap therebetween across the magnetic field; and
a variable reactive element in circuit with the electrodes to vary the resonant frequency of the resonant circuit; and
a voltage input to the resonant circuit, the voltage input being an oscillating voltage that varies in amplitude or frequency over the time of acceleration of charged particles.
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Accused Products
Abstract
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.
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Citations
45 Claims
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1. A synchrocyclotron comprising:
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a magnetic field generator; a resonant circuit, comprising; electrodes, disposed between magnetic poles, having a gap therebetween across the magnetic field; and a variable reactive element in circuit with the electrodes to vary the resonant frequency of the resonant circuit; and a voltage input to the resonant circuit, the voltage input being an oscillating voltage that varies in amplitude or frequency over the time of acceleration of charged particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of producing a particle beam in a synchrocyclotron, comprising:
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injecting charged particles into a synchrocyclotron by an ion source; applying oscillating voltage input to a resonant circuit comprising accelerating electrodes having a gap therebetween across a magnetic field, to create an oscillating electric field across the gap and accelerating charged particles, the oscillating voltage input being controlled to vary in amplitude or frequency over the time of acceleration of the charged particles; and extracting the accelerated charged particles by an extraction electrode to form a particle beam. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A synchrocyclotron comprising:
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injecting means for injecting charged particles into a synchrocyclotron; accelerating means for accelerating the charged particles by an oscillating electric field, the oscillating electric field being varied over the time of acceleration of charged particles, the accelerating means including a resonant circuit that comprises accelerating electrodes having a gap therebetween across the magnetic field and an oscillating voltage input driving the oscillating electric field across the gap, the amplitude or the frequency of the voltage input being varied over the time of acceleration of the charged particles; and extracting means for extracting the accelerated charged particles to form a particle beam. - View Dependent Claims (42, 43, 44, 45)
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41. (canceled)
Specification