JPH0652999A - High-frequency acceleration device of accelerator - Google Patents

Abstract

(57) [Summary] [Object] The present invention controls the output of the power amplifier 13 so that it does not exceed the rated power of the circulator, so that the output of the power amplifier 13 is not stopped. Cure
Protects the motor from overload and improves operation efficiency. A first comparator that compares an output from a detector that detects incident high frequency power to the cavity with a power reference, and a detector that detects a high frequency voltage generated in the cavity. A second comparator for comparing the output with the cavity voltage reference is provided, and the feedback control of the amplitude output by the power amplifier is performed by the incident high frequency power by the outputs of the first and second comparators. A high-frequency accelerating device for an accelerator, which is provided with a function capable of alternately switching between a case of performing and a case of performing with a cavity voltage.

Description

Detailed Description of the Invention

 [Object of the Invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency accelerator for an accelerator.

[0002]

2. Description of the Related Art Conventionally, a synchrotron accelerator having a structure as shown in FIG. 2 is known, and this synchrotron accelerator accelerates particles by a high frequency accelerating device as shown in FIG.

To explain this, first, referring to FIG.
Is a synchrotron accelerator, which comprises a linac 2 for initial acceleration, an injector 3 and a plurality of deflection electromagnets 4. The particles are configured to enter the injector 3 from the linac 2, pass through the magnetic fields of the plurality of deflection electromagnets 4 and are deflected to return to the injector 3 again, and the particles circulate in this path. ing. A cavity 5 is provided in the path through which the particles circulate, and the particles are accelerated by the high-frequency voltage generated inside the cavity every time the particles pass through the cavity 5. 6 is a vacuum beam duct formed along the path of the particles.

In FIG. 3, a power injector 7, a tuner 8 and a probe 9 are provided in the cavity 5, and high frequency power is supplied to the cavity 5 by the power injector 7. A high frequency voltage for particle acceleration is generated in relation to the tuner 8, and the resonance frequency in the cavity 5 is adjusted by retracting the tuner 8. The probe 9 is for obtaining a high frequency signal having a voltage value according to the strength of the high frequency voltage in the cavity 5, and this high frequency signal is used for controlling the amplitude of the high frequency power supplied to the cavity 5. is there.

Reference numeral 10 is an original oscillator, 11 is an attenuator, 1
2 is an attenuator controller, 13 is a power amplifier, 14 is a damascene, 15 is a circulator, 16 is a tuner controller, 17 is a directional coupler, and 18 is a high frequency power detector. , 19 is a cavity voltage detector, 20 is a comparator
Reference numeral 21 is a high frequency switch.

The amplitude of the high-frequency signal from the original oscillator 10 is controlled by the attenuator controller of the attenuators 11 and 12, and the controlled high-frequency signal is amplified by the power amplifier 13 to be the circulator. High frequency power is supplied to the cavity 5 by the power injector 7 via 15. Further, the reflected high frequency power from the power input device 7 is transmitted to the dami load 14 and absorbed therein.

In the amplitude control in the attenuator controller exciter 12, the cavity voltage Vc and the cavity voltage reference V
The amplitude of the high-frequency signal output from the attenuator 11 is determined by feedback control so that cREF and the constant value are always the same. The tuner 8 can be moved to the tuning position by the tuner control device 16. The incident high-frequency power P detected by the directional coupler 17 and the high-frequency power detector 18 is compared with the incident high-frequency power reference PREF in the comparator 20, and when P> PREF, the high-frequency switch 21 is turned off and the circuit is turned on. It protects the switch 15 from overload.

[0008]

In the conventional example, when the tuner 8 is out of tune and the high frequency voltage generated in the cavity 5 drops, the high frequency power supplied to the cavity 5 is increased by the feedback control. It was. However,
Since the circulator 15 has a rated power, it is necessary to turn off the high frequency switch 21 to stop the operation when the high frequency power exceeds a certain value. In particular, when the gain of the power amplifier 13 is variable, the upper limit limiter of the attenuator 11 cannot be set, so that the operation is often stopped and the operation efficiency is deteriorated.

The present invention controls the circulator 15 without stopping the output of the power amplifier 13 by controlling so that the output of the power amplifier 13 does not exceed the rated power of the circulator 15. An object of the present invention is to provide a high-frequency accelerator for an accelerator that protects from overload and improves operating efficiency.

[0010]

In order to achieve the above object, the present invention provides a cavity for generating a high frequency voltage for accelerating particles, a power amplifier for applying a high frequency power to the cavity, and the cavity. In a high-frequency accelerator of an accelerator equipped with a circulator that absorbs reflected high-frequency power from a damee rod, the output from the detector that detects the incident high-frequency power to the cavity and the power reference And a second comparator for comparing an output from a detector for detecting a high-frequency voltage generated in the cavity with a cavity voltage reference. The first and second comparators are provided. The feedback control of the amplitude output from the power amplifier by the output of the comparator is performed alternately with the incident high frequency power and the cavity voltage. It is characterized in that a function that can be switched.

[0011]

According to the present invention, by controlling so that the output of the power amplifier does not exceed the rated power of the circulator, the overload of the circulator can be achieved without stopping the output of the power amplifier. Can be protected from problems without any problems, and driving efficiency can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In comparison with the conventional example shown in FIG. 3, the structure of the high-frequency accelerator shown in FIG. 1 additionally includes a switch 22, a switch controller 23, a comparator 24, and a loop for performing amplitude feedback control with incident high-frequency power. ing. Next, the operation of the present invention will be described with reference to FIG.

First, during normal operation, that is, when the incident high frequency power P is smaller than the incident high frequency power reference PREF, the switch 22 is connected to the 1 side and the amplitude feedback control is performed at the normal cavity voltage.

Next, when the incident high frequency power P becomes larger than the incident high frequency power reference PREF, the comparator 20 sends a signal to the switch controller 23, and the switch control circuit 23 receives the signal and switches the switch 22 to the 2 side. The amplitude feedback control at the cavity voltage Vc is stopped. At this time, the difference between the incident high frequency power P and the incident high frequency power reference PREF is input to the attenuator controller 12, and the mode is switched to the amplitude feedback control with the incident high frequency power, whereby the output from the power amplifier 13 is output. Is the incident high frequency power reference PRE
It is kept the same value as F. If the cavity voltage Vc becomes larger than the cavity voltage reference VcREF while the amplitude feedback control is stopped at the cavity voltage Vc, the comparator is turned off.
In response to this, the switch controller 23 switches the switch 22 to the 1 side, and restarts the amplitude feedback control at the cavity voltage Vc.

In this way, by controlling so that the output of the power amplifier does not exceed the rated power of the circulator 15, in order to protect the circulator 15 from overload as in the conventional case. It is not necessary to stop the operation, and the operation efficiency can be improved.

[0017]

As described above, according to the present invention, there is provided a high frequency accelerator for an accelerator which can protect the circulator from overload without stopping the operation and improve the operation efficiency. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a high frequency accelerator of an accelerator showing an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a synchrotron accelerator.

FIG. 3 is a diagram showing a configuration of a conventional high-frequency accelerator for an accelerator.

[Explanation of symbols]

1 ... Synchrotron accelerator, 2 ... Linac, 3 ... Injector, 4 ... Deflection magnet, 5 ... Cavity, 6 ... Vacuum beam duct, 7 ... Electric power input, 8 ... Tuner, 9 ... Pro-
B, 10 ... Original oscillator, 11 ... Attenuator, 12 ... Attenuator controller, 13 ... Power amplifier, 14 ... Damilo-
15 ... Circulator, 16 ... Tuner control device, 17 ... Directional coupler, 18 ... High frequency power detector, 1
9 ... Cavity voltage detector, 20, 24 ... Comparator
, 21 ... high frequency switch, 22 ... switch, 23 ... switch controller

Claims (1)

[Claims] 1. A cavity for generating a high frequency voltage for accelerating particles, a power amplifier for applying a high frequency power to the cavity, and a server for absorbing a high frequency power reflected from the cavity in a damee rod. In a high frequency accelerator for an accelerator having a curator, a first comparator for comparing an output from a detector for detecting incident high frequency power to the cavity with a power reference and generated in the cavity. A second comparator for comparing the output from the detector for detecting the high frequency voltage with the cavity voltage reference is provided, and the output of the first and second comparators is used to output the amplitude of the power amplifier. Acceleration characterized by being equipped with a function that enables alternate switching of feedback control between incident high frequency power and cavity voltage High frequency accelerator.