JP2001006899A - Control device of high-frequency acceleration cavity and operation method of synchrotron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably emit a beam by stopping feedback control at the emission control time of a synchrotron and by outputting a certain frequency having high purity. SOLUTION: In this control device, a phase-locked loop circuit 708 for compensating an output frequency is provided for a frequency correction signal oscillator 702 for outputting a frequency correction signal (fFB) based on the detection signal of a beam position monitor 2, and the changeover of validness/invalidness of feedback control is controlled based on a timing signal 41 for setting a loop gain setting signal 43 of the phase-locked loop circuit 708 to the reference of synchrotron control, so that a stable certain frequency can be output in incoming control and outgoing control. Frequency feedback control based on the detection signal of the beam position monitor 2 is enabled during acceleration control.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a high-frequency acceleration cavity for accelerating a beam by an ion synchrotron, and more particularly to a stable and simple control of frequency feedback control of a high-frequency voltage supplied to the high-frequency acceleration cavity. The present invention relates to a high-frequency accelerating cavity control device suitable for controlling stable incidence, acceleration, and emission of a beam.

2. Description of the Related Art A high-frequency acceleration system of an ion synchrotron for accelerating a beam of protons or heavy ions is controlled by a high-frequency voltage applied to a high-frequency acceleration cavity (hereinafter referred to as an acceleration cavity) to obtain a uniform and continuous state. To collect the beam incident at
The beam is accelerated or decelerated by controlling the bunched beam in synchronization with the acceleration phase or the deceleration phase of the high-frequency voltage. At this time, in order to stably accelerate the beam in the synchrotron, it is necessary to control the frequency of the high-frequency voltage applied to the acceleration cavity in synchronization with a change in the magnetic field strength of the bending electromagnet. In the high-frequency acceleration control system, the frequency of the high-frequency voltage is controlled in synchronization with the change in the intensity of the deflection magnetic field. Therefore, a magnetic field that detects a change in the intensity of the deflection magnetic field and generates a frequency update signal (hereinafter, a magnetic field clock) proportional to the amount of the change. A clock generator is prepared, and frequency setting data prepared in advance as pattern data is set in the oscillator based on the magnetic field clock. By using the high-frequency signal output from this oscillator as a reference signal at the time of acceleration control, control synchronized with a change in the deflection magnetic field strength can be performed. As a compensation mechanism for such frequency control, a feedback control mechanism based on a detection signal from a beam position monitor is prepared.
This feedback control mechanism performs feedback control by adding a frequency correction amount based on a detection signal of the beam position monitor and a reference signal updated by a magnetic field clock. The beam position monitor can detect the position only when the beams orbiting the synchrotron are clustered. Therefore, it is necessary for the feedback control mechanism based on the output of the beam position monitor to invalidate the control operation until the beam is incident and the grouping is completed. In the prior art, "RF acceleration system at
cooler-synchrotron TARNII, Nuclear Instruments and
Methods in Physics Research A 336 (1993) 391-409
”, Voltage-controlled oscillators (Voltage Controlled Oscillato)
(r, VCO), and when the beam enters the synchrotron, the VCO output is locked to a separately prepared external synthesizer output, and when the beam position can be detected by the beam position monitor, the output to the synthesizer output is The lock has been released. In addition, "Comprehensive Report on Construction of Heavy Ion Beam Therapy System, National Institute of Radiological Sciences, NIRS-M-109, HIMAC-009, P
34, May 1995 ", employs a digital synthesizer as a high-frequency voltage reference signal oscillator, and implements feedback calculation processing by digital signal processing.

In order to stably accelerate and emit a beam incident on a synchrotron to a desired energy, first, in the beam incidence control and the emission control, the frequency of the high-frequency voltage is set to a high-purity constant frequency. Is required. Next, in the acceleration control, the frequency of the high-frequency voltage needs to change following the change in the deflection magnetic field intensity. In the above prior art, when a VCO is used as a high-frequency voltage reference signal oscillator, the VCO output frequency is locked to the external synthesizer output in order to keep the frequency of the high-frequency reference signal at the time of beam incidence. At the time of beam emission that requires frequency output, control to lock the VCO output frequency to the synthesizer output is not implemented,
Feedback control based on the beam position monitor signal output used during the acceleration control is continued. When the emission control is performed with the feedback control enabled, the circulating beam current decreases with the emission of the beam, and the accuracy of the beam position detection by the output of the beam position monitor decreases, so that the accuracy of the frequency correction by the feedback control decreases. . To prevent this, it is necessary to widen the dynamic range of the beam position monitor signal processing circuit. However, the frequency range required for the high-frequency acceleration system of the ion synchrotron is as wide as 0.5 MHz to 10 MHz, so it is technically difficult to widen the dynamic range of the beam position monitor signal processing circuit that requires analog processing. It becomes a factor of high cost. Further, when the beams are emitted, if the beams that are clustered during the acceleration control are changed to a uniform continuous structure, it is possible to suppress the momentum dispersion of the emitted beams. on the other hand,
If the clustered beam is changed to a uniform continuous structure, position detection by the beam position monitor becomes impossible. Therefore, in order to stably and uniformly emit the circulating beam, feedback control based on the output of the beam position monitor must be stopped. However, such a mechanism is not provided in the above-described related art. Therefore, an object of the present invention is to enable high-purity constant frequency output in the synchrotron incidence control and emission control. Another object of the present invention is to provide a mechanism for stopping feedback control during beam emission control.

An object of the present invention is to provide a VCO for outputting a frequency correction signal based on a beam position monitor detection signal.
A phase-locked loop circuit for compensating the output frequency is provided in an analog oscillator such as the one described above, and the valid / invalid switching of feedback control is controlled based on a timing signal serving as a reference for synchrotron control of the loop gain of the phase-locked loop circuit. Thus, a stable constant frequency can be output by the incidence control and the emission control, and the frequency feedback control based on the beam position monitor detection signal can be performed during the acceleration control. In addition, the above object is to provide an oscillator that outputs a frequency correction signal based on a beam position monitor detection signal and an oscillator that outputs a high-frequency reference signal that updates a set value based on a magnetic field clock, by using one direct digital waveform oscillator (Direct Digital Synthesizer DDS). ), A digital signal processing system that can output the data is prepared, and the validity / invalidity of feedback control is controlled based on the timing signal that is the reference for synchrotron control, so that a stable constant frequency can be obtained for input control and output control. Can be output, and at the time of acceleration control, frequency feedback control based on the beam position monitor detection signal can be performed.

An embodiment of the present invention will be described below with reference to the accompanying drawings. (Embodiment 1) FIG. 1 shows a configuration of a control device for a high-frequency accelerating cavity according to a first embodiment of the present invention. In the present embodiment, a direct digital waveform oscillator (Direct Digital Synthesizer, DDS) is used as the reference signal oscillator 503 in the reference signal generator 5 that outputs a frequency based on the magnetic field clock 31, and the detection signal from the beam position monitor 2 is used. An analog oscillator such as a VCO is used as the frequency correction signal oscillator 702 that outputs a correction frequency based on the VCO. The frequency feedback control mixes a high-frequency reference signal (fD) synchronized with a change in the intensity of the deflection magnetic field output from the reference signal generator 5 and a frequency correction signal (fFB) based on a detection signal of the beam position monitor, and It is realized by taking out. The signal output control from each oscillator will be described below. Bending electromagnet 1
With the change in the magnetic field strength, the output of the magnetic field strength change detection element 11 changes. The magnetic field clock 31 is output from the magnetic field clock generator 3 in accordance with the output change of the detection element 11. The magnetic field clock 31 is output in synchronization with the increase / decrease of the unit change amount of the deflection magnetic field strength, and there are two types of clocks indicating increase / decrease. Here, the configuration of the DDS used for the oscillator is shown in FIG. D
DS is the frequency setting register 511, the phase setting register 512,
Amplitude setting register 513, look-up table 514, amplitude modulator 515, D / A converter 516, and low-pass filter 517
Consists of In the look-up table 514, the amplitude-phase information of the sine wave or the cos wave is prepared as digital data, the reading start phase of the amplitude-phase information is determined by the phase setting register 512, and the amplitude-phase information is determined by the frequency register. Determine the information reading interval. After amplitude-modulating the read data with the set value of the amplitude setting register 513, D
The signal is subjected to / A conversion and filtered by a low-pass filter 517 to output a desired waveform. The frequency data and the phase data set in the DDS correspond to the memory addresses of the pattern data prepared in advance in the pattern data memory 502, and the magnetic field clock 3 input to the pattern data setting control unit 501.
By increasing and decreasing the value by 1, the high-frequency reference signal output (fD) synchronized with the deflection magnetic field intensity change can be output. The amplitude data set in the DDS is set to a constant value, and the effective amplitude control is performed by the preamplifier 711. The output frequency is changed based on the magnetic field clock 31 only during acceleration control and deceleration control in which the deflection magnetic field intensity changes. Therefore, the pattern data setting control unit 50
In addition to the magnetic field clock 31, a magnetic field clock input gate signal 42 that permits reading control of the magnetic field clock only during acceleration control and deceleration control is input to 1. The magnetic field clock input gate signal 42 is generated by the timing / gate signal setting device 4 based on the timing signal 41 output from the synchrotron central control device. With these control mechanisms, the reference signal oscillator 503 outputs a high-purity high-frequency reference signal (fD). On the other hand, beam position monitor 2
Are input to the feedback signal processing device 6 and output a frequency correction voltage (Vδf) based on the input signal. This frequency correction voltage (Vδf)
The output voltage setting unit 701 of the low-power high-frequency signal processing device 7 is set. The frequency correction signal oscillator 702 controls the set voltage by the phase lock loop circuit 708 in order to compensate the output frequency constant. The phase lock loop circuit 708 includes an output voltage setting unit 701, a frequency correction signal oscillator 702, and a distributor 70.
3, reference oscillator 704, phase detector 705, low-pass filter 7
06, comprising a loop gain setting unit 707. The valid / invalid switching of the feedback control is controlled by inputting the loop gain setting signal 43 output from the timing / gain setting device 4 to the loop gain setting unit 707. When the loop gain setting signal 43 is not zero, the operation of the phase lock loop circuit 708 becomes effective. In the phase locked loop circuit, the output frequency of the reference oscillator 704 is
The phase difference between (fLOCK) and the output (fFB) of the frequency correction signal oscillator 702 is detected. Here, in order for the phase detector 705 to detect the phase difference between the output of the reference oscillator 704 and the output of the frequency correction signal oscillator 702, the frequency correction signal oscillator 702 includes a reference signal regardless of whether feedback control is enabled or disabled. A voltage having a frequency equal to the output frequency (fLOCK) of the oscillator 704 is set in advance. The phase difference from the phase detector 705 is output as a loop voltage (VLOCK), passes through a low-pass filter 706, is gain-adjusted by a loop gain setting unit 707, and is input to an output voltage setting unit 701. When the feedback control is disabled and the frequency correction voltage (Vδf) based on the beam position monitor detection signal is input to the output voltage setting unit 701, the loop voltage (VLOCK) is corrected by the operation of the phase lock loop circuit. Outputs a voltage that cancels the voltage (Vδf). Thus, the output frequency (fFB) of the frequency correction signal oscillator 702 when the feedback control is invalid can be made equal to the reference oscillator output frequency (fLOCK). When the feedback control is enabled, the output of the loop gain setting signal 43 from the timing / gain setting device 4 is stopped, and the phase lock loop 708 is stopped.
Invalidates the operation of. Thereby, the output voltage setting unit 701
Is set to the frequency correction voltage (Vδf), the output frequency (fFB) is fFB = fLOCK + δf. Through the above processing, the high-frequency reference signal (fD) and the frequency correction signal
(fFB) is determined. These two signals are mixed by the mixer 709, and the upper sidebands of the two mixing signals are used as the frequency (fRF = fD + fFB) of the high-frequency voltage applied to the acceleration cavity. At this time, as described above, the frequency correction signal
Since the output frequency of the reference oscillator 705 is added to (fFB), the high-frequency reference signal (fD) needs to have a frequency subtracted by the reference frequency before input to the mixer 709. By filtering the output of the mixer 709 with the high-pass filter 710, the upper band of the two mixing signals is extracted, and the preamplifier 711 uses the high-frequency voltage amplitude setting data 44 output from the timing / gain setting device 4 based on the amplitude setting data 44. Amplify. The output of the preamplifier 711 is amplified by the power amplifier 7 and applied to the acceleration cavity 8. (Embodiment 2) FIG. 2 shows the configuration of a control device for a high-frequency acceleration cavity according to a second embodiment of the present invention. In this embodiment, FIG.
High frequency reference signal (fD) and frequency correction signal shown in
A voltage controlled oscillator (VCO) is used for the output of (δf).
The magnetic field clock 31 is input to the pattern data setting control unit 501 of the reference signal generator 5. The pattern data setting control unit 501 sets the memory address of the pattern data prepared in the pattern data memory 502 in advance to the magnetic field clock 31.
Update and output based on increase / decrease of. Output value is D / A
The voltage is converted into an analog voltage by the converter 504 and is set in the reference signal oscillator 503 using the VCO, whereby a high-frequency reference signal output (fD) synchronized with the change in the intensity of the deflection magnetic field can be output. The switching between valid and invalid of the feedback control is controlled by the magnetic field clock input gate signal 42 output from the setting signal processing device 4 and the signal of the loop gain setting signal 43 or the phase lock loop circuit operation instruction signal 45. Pattern data setting controller 501 with magnetic field clock input gate signal 42
While the reading of the magnetic field clock 31 to
The update of the pattern data is stopped, and the output frequency of the reference signal oscillator 503 latches the initial setting frequency at the start of control or the frequency data immediately before the magnetic field clock input gate signal 42 is input. Also, a gate circuit 712 prepared in the phase lock loop circuit 708 for outputting a frequency correction signal
The loop circuit is connected by inputting the phase lock loop circuit operation instruction signal 45 to the
By inputting the loop gain setting signal 43 to the input terminal, it is possible to stably output a constant frequency. The method of generating the frequency correction signal (fFB) and the method of outputting the frequency of the high-frequency voltage applied to the acceleration cavity are the same as in the first embodiment. (Embodiment 3) FIG. 3 shows the configuration of a control device for a high-frequency acceleration cavity according to a third embodiment of the present invention. In this embodiment, the high-frequency reference signal (fD) and the frequency correction signal (fFB) are generated by one direct digital oscillator (DDS). Frequency correction voltage (Vδf) based on detection signal of beam position monitor 2
Is digitized by an A / D converter 505 prepared in the reference signal generator 5, and is converted into correction frequency data by a frequency correction calculation unit 506. The reference signal oscillator 503 has frequency setting data (f
D) and the result of addition of the output result (fFB) of the frequency correction calculation unit 506 in the addition calculation unit 507 is set as a low-power high-frequency signal (fRB) of a high-frequency voltage applied to the acceleration cavity.
The switching between valid and invalid of the feedback control is performed by the magnetic field clock input gate signal 42 output from the setting signal processing device.
And a frequency correction operation gate signal 45. While the reading of the magnetic field clock 31 is stopped by the frequency correction operation gate signal 45, the frequency correction operation is stopped, and the frequency of the reference signal oscillator 503 is set to the initial setting frequency at the start of control or the gate signal. By latching the frequency data immediately before the output, a constant frequency can be output stably. (Embodiment 4) FIG. 4 shows a configuration of a control device for a high frequency acceleration cavity according to a fourth embodiment of the present invention. In this embodiment, one VCO is used for an oscillator for generating a high-frequency reference signal (fD) and an oscillator for generating a frequency correction signal (fFB). When outputting a high-frequency voltage with one VCO, the magnetic field clock 31
The pattern data in the pattern data memory 502 is updated on the basis of
, And a reference oscillator 704 corresponding to a frequency at which the feedback control is invalidated in the phase lock loop 708 must be provided. Therefore, in the present embodiment, two reference oscillators 704 are prepared in accordance with the set frequency (fINJ) at the time of the incidence control and the set frequency (fEXT) at the time of the emission control, and are provided in the timing signal 41 output from the synchrotron central controller. The reference oscillator to use based on the reference oscillator selection signal 46 based on
Switch 704. By providing such a mechanism, it is possible to output a stable frequency locked to the output frequency of the reference oscillator 704 by the phase lock loop circuit 708 at the time of the incidence control and the emission control, and to perform the frequency feedback control at the time of the acceleration control. Control device can be provided. (Embodiment 5) FIG. 5 shows an output relationship between a loop gain setting signal 43 and a frequency correction operation gate signal 45 with respect to a timing signal according to a fifth embodiment of the present invention. In the present embodiment, when the feedback control is desired to be performed only in the acceleration control (acceleration start-acceleration end) section in the timing signal serving as the reference of the synchrotron control, the configuration shown in the first, second, or fourth embodiment is not used. , Acceleration start timing 41
Between a and the acceleration end timing 41b, the loop gain setting signal 43 is output with a set value of zero. Further, in the configuration shown in the third embodiment, desired control is possible by outputting the frequency correction operation gate signal 45 in the on state between the acceleration start timing 41a and the acceleration end timing 41b. (Embodiment 6) FIG. 6 shows the output relationship of the amplitude setting data 44, the loop gain setting signal 43, and the frequency correction operation gate signal 45 with respect to the timing signal according to the sixth embodiment of the present invention. In the present embodiment, the amplitude setting data set in the preamplifier 711 is adiabatically reduced between the acceleration end timing signal 41b and the emission start timing signal 41c as indicated by 44a. Accordingly, in the configurations shown in the first, second and fourth embodiments, the loop gain setting signal 43 is simultaneously output with a set value other than zero. In the configuration shown in the third embodiment, desired control is possible by updating the output of the frequency correction operation gate signal 45 to the off state simultaneously with the adiabatic reduction control of the amplitude setting data 44a. When deceleration control is performed on the beam remaining in the synchrotron after the end of the emission control, the amplitude setting data is set in the preamplifier 711 as indicated by 44b before the deceleration control start timing 41d. By performing control to adiabatically increase the amplitude set value and grouping residual beams, deceleration control becomes possible.

According to the present invention, an analog oscillator such as a VCO is used as an oscillator for generating a frequency correction amount, and a phase lock loop is provided in a set voltage control section of the oscillator, thereby setting a loop gain of the phase lock loop. Thus, a stop operation of the feedback control can be performed, a high-purity constant frequency output can be obtained during the incidence control and the emission control, and a stable frequency feedback control operation can be provided during the acceleration control. Further, according to the present invention, the frequency feedback control based on the high-frequency reference signal and the frequency correction amount is performed by digital signal processing, and the frequency feedback control result is directly output by a digital oscillator such as a digital oscillator. And a stable frequency feedback control means can be provided during acceleration control. Further, according to the present invention, the dynamic range of the beam position monitor can be suppressed by controlling the output of the loop gain setting output or the gate signal of the frequency correction operation based on each timing signal in the feedback control, and thereby the beam position can be suppressed. Means for reducing the cost of the monitor signal processing system can be provided. Further, according to the present invention, it is possible to perform beam emission control by changing the circulating beam into a uniform continuous structure, and thus it is possible to provide a means for suppressing the momentum dispersion of the emitted beam.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a control device for a high-frequency acceleration cavity according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a control device for a high-frequency acceleration cavity according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a control device for a high-frequency acceleration cavity according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of a control device for a high-frequency acceleration cavity according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing an output relationship between a loop gain setting signal 43 and a frequency correction operation gate signal 45 with respect to a timing signal according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing an output relationship among amplitude setting data 44, a loop gain setting signal 43, and a frequency correction operation gate signal 45 with respect to a timing signal according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a direct digital oscillator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bending electromagnet, 11 ... Magnetic field intensity change detecting element, 2 ... Beam position monitor, 3 ... Magnetic field clock generator, 31 ... Magnetic field clock, 4 ... Setting signal processor, 41 ... Timing signal, 41a
... Acceleration start timing signal, 41b ... Acceleration end timing signal, 41c ... Extraction start timing signal, 41d ... Deceleration start timing signal, 42 ... Magnetic field clock input gate signal, 43 ...
Loop gain setting signal, 44: amplitude setting data, 44a: amplitude setting pattern for uniform continuation during emission control, 44
b: amplitude setting pattern for regrouping during deceleration control, 45: frequency correction calculation gate signal, 46: reference oscillator setting signal, 47: phase lock loop circuit operation instruction signal, 5 ...
Reference signal generator, 501 ... pattern data setting control unit, 5
02… Pattern data memory, 503… Reference signal oscillator, 504
... D / A converter, 505 ... A / D converter, 506 ... Frequency correction operation unit, 507 ... Addition operation unit, 511 ... Frequency setting register, 512
... Phase setting register, 513 ... Amplitude setting register, 514 ... Lookup ... Table, 515 ... D / A converter, 516 ... Low-pass filter, 6 ... Feedback signal processor, 7 ... Low power high frequency signal processor, 701 ... Frequency correction voltage calculator, 7
02: Output voltage setting unit, 703: Frequency correction signal oscillator, 704
... Distributor, 705 ... Reference oscillator, 706 ... Phase detector, 707 ...
Low-pass filter, 708: loop gain setting unit, 709: phase locked loop circuit, 710: mixer, 711: high-pass filter, 712: preamplifier, 8: power amplifier, 9: high-frequency accelerating cavity.

Claims (6)

[Claims] A means for outputting a frequency update signal in synchronization with a change in deflection magnetic field intensity; a means for generating a reference signal for outputting a high-frequency reference signal in synchronization with the frequency update signal; Feedback signal processing means for outputting a frequency correction amount based on the frequency correction signal, and a low-power high-frequency high-frequency voltage applied to the acceleration cavity by outputting a frequency correction signal based on the frequency correction amount and adding the high-frequency reference signal and the frequency correction signal A means for generating a signal; a means for outputting a loop gain of a phase locked loop circuit based on a timing signal serving as a reference for synchrotron control; and a means for amplifying a low power high frequency signal to power applied to an acceleration cavity. In a control device for a high-frequency accelerating cavity, a phase-locked loop circuit is used as an oscillator constituting a means for generating a low-power high-frequency signal. A control device for a high-frequency accelerating cavity, wherein a frequency-locked signal output is maintained at a constant frequency by operating a phase-locked loop circuit during beam emission control, and frequency feedback control is invalidated. 2. A means for outputting a frequency update signal in synchronization with a change in deflection magnetic field intensity; a means for generating a reference signal for outputting a high-frequency reference signal in synchronization with the frequency update signal; Feedback signal processing means for outputting a frequency correction amount based on the frequency correction signal, and a low-power high-frequency high-frequency voltage applied to the acceleration cavity by outputting a frequency correction signal based on the frequency correction amount and adding the high-frequency reference signal and the frequency correction signal Means for generating a signal, means for outputting a loop gain and a gate signal of a phase locked loop circuit based on a timing signal serving as a reference for synchrotron control, and means for amplifying a low power high frequency signal to power applied to an acceleration cavity In the control device for a high-frequency accelerating cavity composed of A loop circuit is prepared, a gate circuit is provided between the output voltage setting section and the loop gain setting section of the phase locked loop circuit, and the gate circuit is connected at the time of beam emission control to maintain the frequency correction signal output at a constant frequency, A control device for a high-frequency acceleration cavity, wherein feedback control is disabled. 3. A means for outputting a frequency update signal in synchronization with a change in deflection magnetic field intensity, a means for generating a reference signal for outputting a high-frequency reference signal in synchronization with the frequency update signal, and a trajectory displacement detection signal of the orbiting beam Feedback signal processing means for outputting a frequency correction amount based on a signal, means for outputting a frequency correction operation gate signal based on a timing signal serving as a reference for synchrotron control, and amplifying a low-power high-frequency signal to power applied to an acceleration cavity In the control device for the high-frequency accelerating cavity, the digital oscillator is directly used as a means for generating the reference signal, and the frequency correction amount output from the feedback signal processing means is digitally output to the means for generating the reference signal. Means for converting and importing and converting the frequency, and updating in synchronization with the frequency correction amount converted to the frequency and the magnetic field clock A control device for a high-frequency accelerating cavity, characterized in that a means for performing a feedback operation on a control reference frequency to be performed by digital signal processing is provided, and the feedback operation is stopped during beam emission control. 4. A means for outputting a frequency update signal in synchronization with a change in deflection magnetic field intensity, a means for generating a reference signal for outputting a high-frequency reference signal in synchronization with the frequency update signal, and an orbit displacement detection signal of the orbiting beam Feedback signal processing means for outputting a frequency correction amount based on the frequency correction signal, and a low-power high-frequency high-frequency voltage applied to the acceleration cavity by outputting a frequency correction signal based on the frequency correction amount and adding the high-frequency reference signal and the frequency correction signal A means for generating a signal; a means for outputting a loop gain of a phase locked loop circuit based on a timing signal serving as a reference for synchrotron control; and a means for amplifying a low power high frequency signal to power applied to an acceleration cavity. In a control apparatus for a high-frequency accelerating cavity, a phase-locked loop circuit is provided for an oscillator constituting a means for generating a low-power high-frequency signal. In the phase locked loop circuit, a reference oscillator that outputs an appropriate reference frequency at the time of input control to the synchrotron and a beam output control, respectively, and the output of the oscillator is used for the input control and output control of the synchrotron, respectively. Providing means for selecting an appropriate reference frequency, stopping the feedback control by outputting a reference oscillator switching signal and a loop gain setting during beam incidence control and emission control, and outputting a constant frequency. Control device for the acceleration cavity. 5. The method according to claim 1, wherein
In the control device for the high-frequency accelerating cavity described in the section, the feedback control is stopped before the beam is emitted from the synchrotron, and the amplitude value of the high-frequency voltage is adiabatically reduced to zero to make the orbiting beam a uniform continuous structure. A synchrotron operating method characterized in that the emission control is performed by changing to (1). 6. The method according to claim 1, wherein:
In the control device for the high-frequency accelerating cavity described in the section, the feedback control is stopped before the beam is emitted from the synchrotron, and the amplitude value of the high-frequency voltage is adiabatically reduced to zero to make the orbiting beam a uniform continuous structure. A synchrotron operating method characterized in that the emission control is performed by changing to the above, and after the emission control is completed, the beam is clustered again by adiabatically increasing the amplitude value of the high-frequency voltage, and the deceleration control is performed.