CN111506142B - Device and method for synchronously switching currents of beam transport line magnet power supply - Google Patents

Device and method for synchronously switching currents of beam transport line magnet power supply Download PDF

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CN111506142B
CN111506142B CN202010358361.9A CN202010358361A CN111506142B CN 111506142 B CN111506142 B CN 111506142B CN 202010358361 A CN202010358361 A CN 202010358361A CN 111506142 B CN111506142 B CN 111506142B
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current
power supply
magnet power
magnet
control unit
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CN111506142A (en
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韩文杰
秦斌
李冬
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N5/103—Treatment planning systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N5/1048—Monitoring, verifying, controlling systems and methods
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
    • G05F1/466—Sources with reduced influence on propagation delay
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N2005/1085—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy characterised by the type of particles applied to the patient
    • A61N2005/1087—Ions; Protons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N2005/1092—Details

Abstract

The invention discloses a device and a method for synchronously switching current of a magnet power supply of a beam transport line, wherein the device comprises the following steps: the device comprises a beam current transport line control unit, a pulse control unit and a magnet power supply unit; the beam current transmission line control unit is used for making a current list which needs to be output by each magnet power supply according to the sequencing of proton beam energy and sending the current list to the power supply controller corresponding to each magnet power supply; the pulse control unit is used for receiving a trigger command of the beam transport line control unit so as to output a trigger pulse to a magnet power supply of which the output current needs to be changed; and the magnet power supply unit is used for receiving the trigger pulse and switching the current value output by the magnet power supply to the next current value in the current list through the power controller. According to the invention, the rapid synchronous control of a plurality of magnet power supplies is realized in a list triggering mode; the control mode is flexible, the response speed is high, and the control method is stable and reliable.

Description

Device and method for synchronously switching currents of beam transport line magnet power supply
Technical Field
The invention belongs to the field of beam transport line magnet power supply control in proton heavy ion treatment, and particularly relates to a device and a method for synchronously switching current of a beam transport line magnet power supply.
Background
In a proton treatment device based on a cyclotron, the energy of a proton beam is extracted to be fixed energy, the energy of the proton beam needs to be modulated to 70-240MeV through an energy reducer, and then the proton beam is transmitted to each treatment room through a corresponding beam transport line for treating a patient. The proton treatment device realizes the control of proton beams through the magnets of the beam transport line, however, when the energy of the proton beams changes, the output current of the magnet power supply of the beam transport line needs to be quickly adjusted to meet the requirements of beam transport.
At present, the output current of the magnet power supply of the beam current transmission line is changed by directly setting the output current of the magnet power supply in a network command mode. However, the control mode through the network command is influenced by the communication speed, and when the number of the magnet power supplies of the beam current transmission line required to be changed is large, the time interval between the first magnet power supply and the last magnet power supply receiving the command is long, so that the response among the plurality of magnet power supplies is asynchronous, and the response speed of the whole system is reduced.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a device and a method for synchronously switching currents of a beam current transmission line magnet power supply, and aims to solve the problem that the output currents of a plurality of magnet power supplies in the beam current transmission line are not regulated synchronously in the prior art.
To achieve the above object, according to one aspect of the present invention, there is provided an apparatus for synchronously switching current of a beam current carrying line magnet power supply, comprising: the device comprises a beam current transport line control unit, a pulse control unit and a magnet power supply unit;
the beam transport line control unit is connected with the magnet power supply unit through a switch;
the magnet power supply unit comprises a plurality of magnet power supplies and a plurality of power supply controllers, and each power supply controller independently controls one magnet power supply;
the beam current transmission line control unit is used for making a current list which needs to be output by each magnet power supply according to the sequencing of proton beam energy; sending the current list to a power supply controller corresponding to each magnet power supply;
the pulse control unit is used for receiving a trigger command of the beam transport line control unit so as to output a trigger pulse to a magnet power supply of which the output current needs to be changed;
and the magnet power supply unit is used for receiving the trigger pulse and switching the current value output by the magnet power supply to the next current value in the current list through the power controller.
Furthermore, the pulse control unit is in point-to-point connection with the plurality of magnet power supplies, and each magnet power supply is triggered independently through trigger pulses.
Further, the trigger command received by the pulse control unit is a network signal or a pulse signal.
Further, before sending the current list, the beam current transmission line control unit sets current waveform parameters of magnet power supply cyclic excitation in a network communication mode and executes a cyclic excitation process to reset the excitation characteristic of the magnet.
Further, the trigger pulse is an optical pulse signal or an electrical pulse signal.
Further, the current values in the current list are arranged in a descending order or an ascending order.
Further, the current switching state of the magnet power supply is acquired by the beam transport line control unit by inquiring the output current of the magnet power supply, or is judged by the power supply controller and uploaded to the beam transport line control unit.
The invention also provides a method for synchronously switching current of the magnet power supply of the beam current transmission line, which comprises the following steps:
according to the sequencing of proton beam energy, a current list required to be output by each magnet power supply is formulated;
respectively sending the current list to a power supply controller corresponding to each magnet power supply in a network communication mode;
and outputting a trigger pulse to the magnet power supply needing to change the output current, and switching the current value output by the magnet power supply to the next current value in the current list through the power controller.
Further, before the current list is sent, the current waveform parameters of the magnet power supply cyclic excitation are set through network communication and a cyclic excitation process is carried out to reset the excitation characteristic of the magnet.
Further, the current waveform parameters of the cyclic excitation include: time of rising current T1Flat top current time T2Time of down flow T3Flat bottom current time T4Number of times of cyclic excitation N and cyclic excitation flat top current value I1(ii) a When the output current of the magnet power supply changes delta I to be more than 2 percent I1The current falling time of each current step in the current list is delta I T3/I1(ii) a When Δ I is less than or equal to 2% I1When the current reduction time of each current step is not more than 2% T3。
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the method comprises the steps of presetting a current list to be output by each magnet power supply, and sending the current list to a power supply controller of the magnet power supply; in the current regulation process, the current values stored in the power supply controller are sequentially output in a pulse triggering mode, so that synchronous triggering control of the output currents of the plurality of magnet power supplies is realized; therefore, the output current of the magnet power supply does not need to be set in a network communication mode, and communication blockage of a plurality of power supplies is avoided.
(2) In the current list triggering process, the magnet power supply limits the output current change rate not to be larger than the current change rate in the cyclic excitation process, so that enough time is reserved for the waveform fitting and current adjusting process of the magnet power supply, and no overshoot or small current overshoot is ensured in the adjusting process of the output current of the magnet power supply.
Drawings
Fig. 1 is a schematic structural diagram of a device for synchronously switching current of a beam current transmission line magnet power supply provided by the invention;
FIG. 2 is a waveform diagram of a cyclic excitation current provided by an embodiment of the present invention;
fig. 3 is a table trigger current waveform diagram provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, a schematic structural diagram of a device for synchronously switching current of a beam current transmission line magnet power supply provided by the present invention includes: the device comprises a beam current transport line control unit, a pulse control unit and a magnet power supply unit;
the beam current transmission line control unit is connected with the magnet power supply unit through a switch, and a communication protocol is a self-defined TCP (transmission control protocol) protocol and is used for realizing parameter setting of the magnet power supply and sending of a current list;
the pulse control unit is used for receiving a trigger command of the beam transport line control unit so as to output a trigger pulse to a magnet power supply of which the output current needs to be changed; the pulse control unit is in point-to-point connection with the plurality of magnet power supplies, and each magnet power supply is triggered independently through trigger pulses;
the magnet power supply unit includes a plurality of magnet power supplies and a plurality of power supply controllers, each of which individually controls one of the magnet power supplies.
The device for synchronously switching the current of the beam current transmission line magnet power supply comprises the following specific control flows of each unit:
(1) the beam current transport line control unit sets current waveform parameters of magnet power supply cyclic excitation in a network communication mode and executes a cyclic excitation process to reset the excitation characteristic of the magnet.
(2) A beam current transport line control unit formulates a current list required to be output by each magnet power supply according to the sequencing of proton beam energy, and sends the current list to a power supply controller corresponding to each magnet power supply; it should be noted that the current amount and the current value in the current list may be set as required, and the current amount in the plurality of magnet power supply current lists is the same, but the current value in each magnet power supply current list is different.
(3) When the output current of the magnet power supply needs to be changed, the beam current transport line control unit sends a trigger command to the pulse control unit, so that the pulse control unit sends a trigger pulse to the magnet power supply needing to change the output current.
(4) When the magnet power supply detects an external trigger pulse, the power supply controller switches the current value output by the magnet power supply to the next current value in the current list and waits for the next trigger pulse; when the output current is the last current value in the current list, the output current of the magnet power supply is reduced to zero by receiving the trigger pulse again.
Referring to fig. 2, a waveform diagram of a circular excitation current provided by an embodiment of the present invention is a circular excitation process of a magnet power supply, in which a magnet is reset through multiple cyclesThe excitation characteristics of the iron. The current waveform parameters of the cyclic excitation comprise: time of rising current T1Flat top current time T2Time of down flow T3Flat bottom current time T4Number of times of cyclic excitation N and cyclic excitation flat top current value I1。
Fig. 3 is a table diagram of trigger current waveforms provided in the embodiment of the present invention. In this embodiment, the current list is sorted in descending order, the maximum current number in the current list is 50, and all the current values in the list are smaller than the current flat top value I2The trigger pulse is a multimode optical pulse signal.
Magnet power supply at T5Increasing the output current to the current plateau value I within the time2And waiting for a trigger pulse, and when a first trigger pulse is detected, reducing the output current of the magnet power supply to a first current value I of the current listset1Then maintains the output Iset1And waiting for an external trigger signal; when the power supply controller detects the external trigger pulse again, the power supply controller reduces the output current of the magnet power supply to a second current value I in the current listset2And maintaining the output current Iset2Continues to wait for a trigger pulse; the above state is repeated until the last current value in the list of output currents. After the power supply is adjusted, the current running state can be inquired in the magnetic iron power controller through a network command.
Note that, in order to ensure the excitation characteristics of the magnet, the flat top current value I of the cyclic excitation1Flat-top current value I in trigger process of and list2Equal; rise time T of cyclic excitation current waveform1Current rise time T of current waveform triggered by list5And (5) the consistency is achieved.
In this embodiment, during the list triggering process, the magnet power supply will limit its output current rate of change to no more than the current rate of change of the cyclic excitation process. When the output current of the magnet power supply changes delta I to be more than 2 percent I2Then, the current reduction time of each current step in the current list is adjusted according to the difference value of the response current, and the adjustment time is delta I T3/I2(ii) a When current flowsVariation Δ I less than or equal to 2% I2When the time is not more than 2% T3. By the method, enough time can be reserved for the waveform fitting and current adjusting process of the magnet power supply, and no overshoot or small current overshoot is ensured in the adjusting process of the output current of the magnet power supply.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. The utility model provides a device of line magnet power synchronous switching current is transported to beam current which characterized in that includes: the device comprises a beam current transport line control unit, a pulse control unit and a magnet power supply unit;
the beam transport line control unit is connected with the magnet power supply unit through a switch;
the magnet power supply unit comprises a plurality of magnet power supplies and a plurality of power supply controllers, and each power supply controller independently controls one magnet power supply;
the beam current transmission line control unit is used for making a current list which needs to be output by each magnet power supply according to the sequencing of proton beam energy; sending the current list to a power supply controller corresponding to each magnet power supply;
the pulse control unit is used for receiving a trigger command of the beam transport line control unit so as to output a trigger pulse to a magnet power supply of which the output current needs to be changed;
the magnet power supply unit is used for receiving the trigger pulse and switching the current value output by the magnet power supply to the next current value in the current list through the power controller;
the current switching state of the magnet power supply is obtained by the beam current transmission line control unit through inquiring the output current of the magnet power supply, or is judged by the power supply controller and is uploaded to the beam current transmission line control unit.
2. The apparatus for switching current synchronously with a loadline magnet power supply of claim 1, wherein the pulse control unit is connected point-to-point to the plurality of magnet power supplies, and each magnet power supply is individually triggered by a trigger pulse.
3. The apparatus for switching current synchronously of a line magnet power source according to claim 1 or 2, wherein the trigger command received by the pulse control unit is a network signal or a pulse signal.
4. The apparatus for switching current synchronously with a beam transport line magnet power supply according to claim 1, wherein said beam transport line control unit sets a current waveform parameter of a magnet power supply cyclic excitation and performs a cyclic excitation process to reset an excitation characteristic of the magnet by means of network communication before transmitting the current list.
5. The apparatus for switching current synchronously with a loadline magnet power supply of claim 1, wherein the trigger pulse is an optical pulse signal or an electrical pulse signal.
6. The apparatus for switching current synchronously with a line magnet power supply of claim 1, wherein the current values in said list of currents are in descending order or in ascending order.
7. A method for synchronously switching current of a beam current transmission line magnet power supply is characterized by comprising the following steps:
according to the sequencing of proton beam energy, a current list required to be output by each magnet power supply is formulated;
respectively sending the current list to a power supply controller corresponding to each magnet power supply in a network communication mode;
and outputting a trigger pulse to the magnet power supply needing to change the output current, and switching the current value output by the magnet power supply to the next current value in the current list through the power controller.
8. The method for switching the current synchronously of the line magnet power supply according to claim 7, wherein before sending the current list, the current waveform parameters of the magnet power supply cyclic excitation are set by means of network communication and the cyclic excitation process is performed to reset the excitation characteristic of the magnet.
9. The method of claim 8, wherein the current waveform parameters of the cyclic excitation comprise: time of rising current T1Flat top current time T2Time of down flow T3Flat bottom current time T4Number of times of cyclic excitation N and cyclic excitation flat top current value I1；
When the output current of the magnet power supply changes delta I to be more than 2 percent I1The current falling time of each current step in the current list is delta I T3/I1(ii) a When Δ I is less than or equal to 2% I1When the current reduction time of each current step is not more than 2% T3。
CN202010358361.9A 2020-04-29 2020-04-29 Device and method for synchronously switching currents of beam transport line magnet power supply Active CN111506142B (en)

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CN113934253B (en) * 2021-10-26 2022-10-25 哈尔滨工业大学 Pulse power device for regulating and controlling simulation magnetic layer top magnetic field configuration

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CN110856336A (en) * 2019-11-27 2020-02-28 中国原子能科学研究院 Real-time adjustment equipment and method for magnet power supply of cyclotron

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CN109094490A (en) * 2017-06-20 2018-12-28 现代自动车株式会社 The electric power controller and its control method of vehicle
CN108811298A (en) * 2018-06-27 2018-11-13 中国原子能科学研究院 A kind of system and method for temperature-compensating automatic adjustment cyclotron main field
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