WO2019100858A1 - Procédé de réalisation d'un test de cavité froide sur une tension d'accélération de cyclotron à l'aide d'une impédance équivalente parallèle - Google Patents

Procédé de réalisation d'un test de cavité froide sur une tension d'accélération de cyclotron à l'aide d'une impédance équivalente parallèle Download PDF

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Publication number
WO2019100858A1
WO2019100858A1 PCT/CN2018/109798 CN2018109798W WO2019100858A1 WO 2019100858 A1 WO2019100858 A1 WO 2019100858A1 CN 2018109798 W CN2018109798 W CN 2018109798W WO 2019100858 A1 WO2019100858 A1 WO 2019100858A1
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Prior art keywords
accelerating voltage
port
test
cyclotron
impedance
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PCT/CN2018/109798
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English (en)
Chinese (zh)
Inventor
陈根
张鑫
宋云涛
陈永华
杨庆喜
刘广
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合肥中科离子医学技术装备有限公司
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Publication of WO2019100858A1 publication Critical patent/WO2019100858A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application

Definitions

  • the invention belongs to the technical field of cyclotrons, and relates to a cold chamber testing method for applying an equivalent parallel impedance for realizing an accelerating voltage of a cyclotron.
  • Cyclotrons are widely used in the fields of physics, military engineering, biology, radiopharmaceutical pharmaceuticals, etc., and they are also involved in the field of cancer treatment.
  • the proton cyclotron high frequency resonant cavity is excited by a high frequency transmitter, which acts to form a high frequency electric field in the gap between the cavity electrode and the ground.
  • a high frequency transmitter acts to form a high frequency electric field in the gap between the cavity electrode and the ground.
  • the ion beam passes through the gap, it is accelerated by the harmonics of the electric field force, and the energy gain obtained after the acceleration is proportional to the acceleration voltage of the cavity. Therefore, the accelerating voltage level and stability of the resonant cavity are closely related to the beam conditioning and beam quality and intensity.
  • the accelerating voltage test is mainly based on the fact that the resonant cavity is not fed with RF power, and the test is converted to obtain the accelerating voltage at the gap.
  • the purpose is to verify the error value of the accelerating voltage of the physical analysis of the resonant cavity, and provide a reliable beam for the high-frequency resonant cavity. Accelerated voltage and beam trajectory analysis.
  • the object of the present invention is to provide a method for testing an accelerating voltage cold chamber of a cyclotron using an equivalent parallel impedance, which is used for realizing an acceleration voltage measurement at an arbitrary position in an acceleration slit, and solves the problem that the current bremsstrahlung energy spectrum method can only be equivalently tested. Accelerated voltage problem.
  • the cyclotron accelerating voltage cold chamber test method is implemented by using the equivalent parallel impedance, and the cold test method comprises the following steps:
  • the cold test is that the accelerator cavity is not fed with radio frequency power.
  • the test probe is composed of a coaxial RF cable connected in parallel with a 50 ohm resistor, and the 50 ohm resistor is a resonant frequency band without a sense resistor.
  • the test probe comprises a coaxial RF cable inner conductor, a 50 ohm resonant band non-inductive resistor and a coaxial RF cable outer conductor; the coaxial RF cable inner conductor extends out of the outer conductor length of 5 cm, and the inner conductor and the outer conductor end face are flush
  • the non-inductive resistor of the 50-ohm resonant frequency band is connected to the outer conductor of the coaxial RF cable, and the N-type RF connector is connected to the bottom of the test probe.
  • the test instrument is a vector network analyzer; the vector network analyzer is connected to the accelerator cavity coupling port by one port, and the N-type RF connector of the test probe is connected to the other port.
  • the specific operation of the step 2) is: adjusting the coupling matching state by observing the impedance circle diagram, and if the matching origin is outside the impedance circle diagram, adjusting the coupling port to expand the coupling amount; if the matching origin is inside the impedance circle diagram, adjusting the coupling port to reduce the coupling amount So that the impedance circle map matches the origin, and the reflection coefficient is S11 ⁇ -25dB.
  • a certain distance in the step 3) is 10 mm.
  • the invention has the beneficial effects that the invention can test the converted acceleration voltage at the gap under the condition that the resonant cavity has no feeding power, verify the error value of the acceleration voltage of the physical analysis of the resonant cavity, and provide a reliable beam for the high frequency resonant cavity. Accelerated voltage and beam trajectory analysis.
  • FIG. 1 is a schematic diagram of a resonant cavity test of the present invention
  • FIG. 2 is a schematic view of a test probe of the present invention
  • the cold test method includes: taking a measurement point 2 every 10 mm on the acceleration slit 1 of the accelerator cavity 4; 3 connected to the vector network analyzer and transferred to the N-type RF connector 8;
  • the cold test method comprises a test probe, the test probe is a parallel 50 ohm impedance probe, and the coaxial RF cable is connected in parallel with a 50 ohm resistor, and the 50 ohm resistor is a resonant frequency band non-inductive resistor;
  • the inner conductor of the coaxial RF cable protrudes from the outer conductor by a length of 5 cm, and the inner conductor is flush with the outer conductor end surface, and is connected to the coaxial RF cable outer conductor 7 through the 50-ohm resonant band non-inductive resistor 6, and the test probe bottom connection There is an N-type RF connector 8.
  • the cold test is that the accelerator cavity is not fed with radio frequency power.
  • test instrument used is a vector network analyzer.
  • the vector network analyzer is connected to the accelerator cavity coupling port 3 by one port, and the N-type RF connector 8 of the test probe is connected to the other port.
  • the resonant cavity is adjusted to the coupling matching state by observing the impedance diagram, and if the matching origin is in the impedance circle diagram Externally, adjust the coupling port to expand the coupling amount; if the matching origin is inside the impedance circle diagram, adjust the coupling port to reduce the coupling amount, so that the impedance circle map matches the origin, and the reflection coefficient is S11 ⁇ -25dB;
  • Z 0 is a 50 ohm resonance band with no sense resistor 6.
  • the transfer matrix ABCD (between ports PORT 2A and 2B) can be expressed as:
  • the transmission matrix is cascaded between ports 1 and 2B, which is the product of the cavity transfer matrix and the transfer matrix between planes 2A and 2B.
  • the accelerating voltage of the slot is tested and converted, the error value of the accelerating voltage of the physical analysis of the resonant cavity is verified, and a reliable accelerating voltage and beam trajectory are provided for the beam of the high frequency resonant cavity. analysis.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Particle Accelerators (AREA)

Abstract

La présente invention concerne un procédé de réalisation d'un test de cavité froide sur une tension d'accélération d'un cyclotron à l'aide d'une impédance équivalente parallèle. Le procédé est effectué dans les conditions suivantes: aucune énergie radiofréquence n'est introduite dans la cavité résonante du cyclotron, la sonde de test est une sonde à impédance de 50 ohms connectée en parallèle et formée par la connexion d'un câble radiofréquence coaxial et d'une résistance de 50 ohm en parallèle, la résistance de 50 ohms est une résistance non inductive à bande de fréquence de résonance, et l'instrument de test est un analyseur de réseau vectoriel. Un port de l'instrument de test est connecté à un port de mise en correspondance de couplage de cavité résonante de cyclotron, et l'autre port de celui-ci est connecté à la sonde de test; le port de couplage de cavité résonante de cyclotron est ajusté pour être dans un état de mise en correspondance de couplage par l'observation d'un diagramme d'impédance; des points de mesure sont pris à un intervalle d'une certaine distance sur un espace d'accélération, et la sonde de test mesure séquentiellement un coefficient de transmission S21 de chaque point; et (I) est obtenue en fonction d'un diagramme de circuit équivalent de test de cavité résonante pour obtenir une impédance parallèle des points de mesure, et la tension d'accélération des points de mesure est obtenue en fonction de la formule de calcul (II). Une tension d'accélération à n'importe quelle position d'un espace d'accélération peut être mesurée, de sorte qu'une tension d'accélération fiable et une analyse de trajectoire de courant de faisceau pour un courant de faisceau d'une cavité résonante à haute fréquence sont obtenues.
PCT/CN2018/109798 2017-11-23 2018-10-11 Procédé de réalisation d'un test de cavité froide sur une tension d'accélération de cyclotron à l'aide d'une impédance équivalente parallèle WO2019100858A1 (fr)

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CN201711184905.9A CN107976567A (zh) 2017-11-23 2017-11-23 应用等效并联阻抗实现回旋加速器加速电压冷腔测试方法
CN201711184905.9 2017-11-23

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CN112798873A (zh) * 2020-12-30 2021-05-14 中国原子能科学研究院 一种用于耦合腔加速结构的端耦合腔测量装置及端耦合腔测量方法
CN114217101A (zh) * 2021-10-30 2022-03-22 荣耀终端有限公司 一种射频测试探针结构以及射频测试系统

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CN108802475A (zh) * 2018-06-12 2018-11-13 合肥中科离子医学技术装备有限公司 利用平行电阻进行回旋加速器高频腔加速电压测量的方法

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CN114217101A (zh) * 2021-10-30 2022-03-22 荣耀终端有限公司 一种射频测试探针结构以及射频测试系统

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