CN113990726A - BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC - Google Patents
BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC Download PDFInfo
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- CN113990726A CN113990726A CN202111119372.2A CN202111119372A CN113990726A CN 113990726 A CN113990726 A CN 113990726A CN 202111119372 A CN202111119372 A CN 202111119372A CN 113990726 A CN113990726 A CN 113990726A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000000605 extraction Methods 0.000 claims abstract description 6
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
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- 206010028980 Neoplasm Diseases 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
- H01J27/18—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation with an applied axial magnetic field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/022—Details
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Abstract
The invention relates to the technical field of BNCT, in particular to a BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC. The ECR ion source comprises a microwave generating and transmitting feeding system, a discharge chamber, an extraction system, a vacuum system, a beam measuring system, a power supply system, a high-voltage system and a control system. The specific generation mechanism is as follows: the microwave power generated by the magnetron is transmitted by the waveguide and coupled to the discharge chamber, a microwave electric field is formed in the discharge chamber, part of electrons do larmor cyclotron motion in the magnetic field under the action and the constraint of the axial static magnetic field, and when the cyclotron frequency of the electrons is equal to the microwave frequency, part of the electrons are heated by cyclotron resonance and ionize working gas to generate high-temperature plasma. After the steps of the method are adopted for time delay processing, the beam outlet difficulty of the ECR ion source is greatly reduced, and the beam outlet can be completed by one key.
Description
Technical Field
The invention relates to the technical field of BNCT, in particular to a BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC.
Background
Boron Neutron Capture Therapy (BNCT) is a radiation therapy that uses neutrons to nuclear react with boron in tumors to destroy cancer cells. The system mainly comprises a proton accelerator, a neutron generation target, boron-containing drugs, treatment software, dose measurement subsystems and the like.
BNCT uses ECR ion source as hydrogen proton generating device, the ion source is a device that ionizes neutral atoms or molecules and extracts ion beam, and it is widely used in the fields of accelerators, high-energy physics, ion implanters, semiconductors, cancer therapy, and the like. The ECR ion source is used as a proton generating device, firstly, hydrogen is injected, microwave power is loaded, a confinement magnetic field is loaded, hydrogen is ionized to generate plasma, then, high voltage of 75kV is loaded to extract protons in the plasma, and the plasma is further accelerated to required energy to finish target shooting. The light path led out at the moment of loading high voltage changes along with the high voltage and is not in the correct light path, so that partial hydrogen protons are emitted to the inhibiting electrode to emit electrons, the electrons are accelerated reversely under the action of the high voltage to form a local short circuit, and the high voltage cannot be added.
Disclosure of Invention
Aiming at the problem that electrons can be reversely accelerated to form a local short circuit under the action of high voltage and the high voltage cannot be added, the invention aims to provide a BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC, which are used for solving the problems of local short circuit and incapability of adding high voltage.
The technical scheme adopted by the invention for solving the technical problem is as follows: a BNCT high-duty-cycle ECR ion source efficient beam-emitting system based on PLC comprises a microwave generation and microwave transmission feeding system, a discharge chamber, an extraction system, a vacuum system, a beam measuring system, a power supply system, a high-voltage system and a control system. The ion source leading-out system adopts a three-electrode structure and comprises a plasma electrode, a suppression electrode and a ground electrode. The plasma electrode is at a positive high potential, the suppression electrode is at a negative potential, and the ground electrode is at ground potential.
The plasma electrode is 70-80 kv.
The suppression electrode is-3-1 kv.
The method comprises the following steps based on PLC control:
s1, turning off the output of the microwave power supply: closing the microwave power output of the ECR ion source;
s2, turn off suppression power supply output: after time delay, the output of the suppression power supply is closed;
s3, turning off the output of the acceleration power supply: after delaying, turning off the output of the acceleration power supply;
s4, modifying the timing pulse width: modifying the duty ratio and setting the timing pulse width;
s5, turn on suppression power supply output: after time delay, the suppression power supply output is turned on;
and S6, turning on the output of the acceleration power supply: after time delay, the microwave power supply is turned on to output;
s7, turning on the microwave power output: after the delay, the output of the acceleration power supply is turned on.
The BNCT high-duty-cycle ECR ion source high-efficiency beam outlet method based on PLC can perform time sequence operation under narrow pulse to finish high-efficiency beam outlet.
The delay time in S2 is 150-250 milliseconds.
The delay time in S3 is 150-250 milliseconds.
The delay time in S5 is 150-250 milliseconds.
The delay time in S6 is 350-450 ms.
The delay time in S7 is 550 and 650 milliseconds.
The invention has the beneficial effects that: after the system and the method are adopted, the beam outlet difficulty of the ECR ion source is greatly reduced, and the beam outlet can be finished by one key.
Drawings
FIG. 1 is a schematic diagram of an ECR source extraction structure of the present invention.
Fig. 2 is a schematic diagram of a one-key beam-out operation method of the present invention.
Reference is made to the accompanying drawings in which: 1-plasma generator, 2-plasma electrode, 3-suppression electrode, 4-ground electrode.
Detailed Description
The following detailed description of the embodiments of the invention is provided in conjunction with the drawings of the specification:
referring to fig. 1-2, a BNCT high duty cycle ECR ion source high efficiency beam-exiting system and method based on PLC is used to solve the problems of local short circuit and unable to add high voltage; the extraction structure of the ECR ion source comprises a plasma electrode, a suppression electrode and a ground electrode. The plasma electrode is at a positive high potential, the suppression electrode is at a negative potential, and the ground electrode is at a ground potential; the plasma electrode 2 of the arc chamber plasma generator 1 is at a positive high potential, the plasma electrode 2 is 70-80kv, the suppression electrode 3 is at a negative potential, the suppression electrode 3 is-3-1 kv, and the ground electrode 4 is at a ground potential; as shown in the ECR source extraction scheme, the plasma electrode 2 is at a positive high potential, preferably 75 kv; the suppression electrode 3 is preferably-2.2 kv, the ground electrode 4 is at ground potential, and free electrons generated by protons hitting the ground electrode 4 after the suppression electrode 3 cannot be injected back into the ion source due to the negative potential of the suppression electrode 3.
The BNCT high duty ratio ECR ion source high-efficiency beam output method based on PLC is a sequential step, can be realized through PLC or an upper computer program, is easy to integrate into an original control system, and is mainly realized through the following steps:
s1, turning off the output of the microwave power supply: the microwave power output of the ECR ion source is turned off.
S2, turn off suppression power supply output: the inhibit power supply output is turned off after a delay of 150-250 milliseconds, preferably 200 milliseconds.
S3, turning off the output of the acceleration power supply: the boost power output is turned off after a delay of 150-250 milliseconds, preferably 200 milliseconds.
S4, modifying the timing pulse width: modifying the duty ratio and setting the timing pulse width; specifically, the timing pulse width can be manually input through an equipment operation interface, a program is modified in a background mode, the value is generally input in advance, and the value is directly read when the device is used.
S5, turn on suppression power supply output: the delay is 150- 250 milliseconds, preferably 200 milliseconds, and then the inhibit power output is turned on.
And S6, turning on the output of the acceleration power supply: the delay is 350-450 ms later, preferably 400 ms later, followed by turning on the microwave power output.
S7, turning on the microwave power output: after a delay of 550-.
The invention relates to sequential steps of a BNCT high-duty-ratio ECR ion source high-efficiency beam output method based on PLC, which can be realized by PLC or an upper computer program, is easy to integrate into an original control system, greatly reduces the beam output difficulty of the ECR ion source, and can realize the beam output of the ion source by one key; by adopting the method, the beam outlet difficulty is greatly reduced, and the beam outlet of the ion source can be completed by one key.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, and those skilled in the art may make modifications and variations within the spirit of the present invention, and all modifications, equivalents and modifications of the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (10)
1. A BNCT high-duty ratio ECR ion source efficient beam-emitting system based on PLC is disclosed, wherein the ECR ion source comprises a microwave generation and microwave transmission feeding system, a discharge chamber, an extraction system, a vacuum system, a beam measuring system, a power supply system, a high-voltage system and a control system. The ion source leading-out system adopts a three-electrode structure and comprises a plasma electrode, a suppression electrode and a ground electrode. The plasma electrode is at a positive high potential, the suppression electrode is at a negative potential, and the ground electrode is at ground potential.
2. The BNCT high duty cycle ECR ion source high efficiency beam outgoing system based on PLC according to claim 1, wherein: the plasma electrode is 70-80 kv.
3. The BNCT high duty cycle ECR ion source high efficiency beam outgoing system based on PLC according to claim 1, wherein: the suppression electrode is-3-1 kv.
4. A BNCT high duty cycle ECR ion source high-efficiency beam outgoing method based on PLC is characterized in that: the method comprises the following steps based on PLC control:
s1, turning off the output of the microwave power supply: closing the microwave power output of the ECR ion source;
s2, turn off suppression power supply output: after time delay, the output of the suppression power supply is closed;
s3, turning off the output of the acceleration power supply: after delaying, turning off the output of the acceleration power supply;
s4, modifying the timing pulse width: modifying the duty ratio and setting the timing pulse width;
s5, turn on suppression power supply output: after time delay, the suppression power supply output is turned on;
and S6, turning on the output of the acceleration power supply: after time delay, the microwave power supply is turned on to output;
s7, turning on the microwave power output: after the delay, the output of the acceleration power supply is turned on.
5. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the method can perform time sequence operation under narrow pulse to finish high-efficiency beam output.
6. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the delay time in S2 is 150-250 milliseconds.
7. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the delay time in S3 is 150-250 milliseconds.
8. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the delay time in S5 is 150-250 milliseconds.
9. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the delay time in S6 is 350-450 ms.
10. The PLC-based BNCT high duty cycle ECR ion source high efficiency beam outgoing method according to claim 4, wherein: the delay time in S7 is 550 and 650 milliseconds.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111119372.2A CN113990726A (en) | 2021-09-24 | 2021-09-24 | BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC |
| PCT/CN2022/094088 WO2023045368A1 (en) | 2021-09-24 | 2022-05-20 | Plc-based bnct high-duty-ratio ecr ion source efficient beam output system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111119372.2A CN113990726A (en) | 2021-09-24 | 2021-09-24 | BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC |
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| Publication Number | Publication Date |
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| CN113990726A true CN113990726A (en) | 2022-01-28 |
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| CN202111119372.2A Pending CN113990726A (en) | 2021-09-24 | 2021-09-24 | BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC |
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| CN (1) | CN113990726A (en) |
| WO (1) | WO2023045368A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023045368A1 (en) * | 2021-09-24 | 2023-03-30 | 散裂中子源科学中心 | Plc-based bnct high-duty-ratio ecr ion source efficient beam output system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8188445B2 (en) * | 2009-04-03 | 2012-05-29 | Varian Semiconductor Equipment Associates, Inc. | Ion source |
| CN102117727B (en) * | 2011-01-25 | 2013-07-10 | 北京大学 | Electron cyclotron resonance ion source |
| CN113990726A (en) * | 2021-09-24 | 2022-01-28 | 散裂中子源科学中心 | BNCT high-duty-cycle ECR ion source efficient beam outlet system and method based on PLC |
-
2021
- 2021-09-24 CN CN202111119372.2A patent/CN113990726A/en active Pending
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2022
- 2022-05-20 WO PCT/CN2022/094088 patent/WO2023045368A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023045368A1 (en) * | 2021-09-24 | 2023-03-30 | 散裂中子源科学中心 | Plc-based bnct high-duty-ratio ecr ion source efficient beam output system and method |
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| WO2023045368A1 (en) | 2023-03-30 |
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Effective date of registration: 20240106 Address after: Room 101, Unit 1, Building 1, No. 1 Yiran Road, Songshanhu Park, Dongguan City, Guangdong Province, 523808 Applicant after: Guoke Neutron Medical Technology Co.,Ltd. Address before: 100000 courtyard (b), No. 19, Yuquan Road, Shijingshan District, Beijing Applicant before: INSTITUTE OF HIGH ENERGY PHYSICS, CHINESE ACADEMY OF SCIENCES |