WO2019100858A1 - Method for conducting cold-cavity test on accelerating voltage of cyclotron by using equivalent parallel impedance - Google Patents
Method for conducting cold-cavity test on accelerating voltage of cyclotron by using equivalent parallel impedance Download PDFInfo
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- 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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- 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
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- 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.
Abstract
A method for conducting a cold-cavity test on an accelerating voltage of a cyclotron by using equivalent parallel impedance. The method comprises: no radio frequency power is fed in a cyclotron resonant cavity, a test probe is a parallel-connected 50 ohm impedance probe and is formed by connecting a coaxial radio frequency cable and a 50 ohm resistor in parallel, the 50 ohm resistor is a resonant frequency band non-inductive resistor, and a test instrument is a vector network analyzer. One port of the test instrument is connected to a cyclotron resonant cavity coupling matching port, and the other port thereof is connected to the test probe; the cyclotron resonant cavity coupling port is adjusted to be in a coupling matching state by observing an impedance chart; measurement points are taken at an interval of a certain distance on an accelerating gap, and the test probe sequentially measures a transmission coefficient S21 of each point; and (I) is derived according to a resonant cavity test equivalent circuit diagram to obtain parallel impedance of the measurement points, and the accelerating voltage of the measurement points is obtained according to a calculation formula (II). An accelerating voltage at any position of an accelerating gap can be measured so that reliable accelerating voltage and beam current trajectory analysis for beam current of a high-frequency resonant cavity is provided.
Description
本发明属于回旋加速器技术领域，涉及一种应用等效并联阻抗用于实现回旋加速器加速电压的冷腔测试方法。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.
回旋加速器广泛的应用于物理、军事工程、生物学、放射性药物制药等领域，其中，在肿瘤治疗领域也有所涉及。质子回旋加速器高频谐振腔体由高频发射机激励，它的作用是在腔体电极与地之间的缝隙中形成高频电场。每当离子束团通过缝隙时，便受到电场力的谐波加速，加速后获得的能量增益与谐振腔的加速电压成正比。因此，谐振腔加速电压的高低和稳定性与调束及束流品质、强度有着密切的关系。加速电压测试主要是在谐振腔没有馈入射频功率的条件下，测试换算得到缝隙处加速电压，目的是验证谐振腔物理分析的加速电压的误差值，为高频谐振腔的束流提供可靠的加速电压及束流轨迹分析。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. Whenever 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.
发明内容Summary of the invention
本发明的目的在于提供一种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，用于实现加速缝隙处任意位置加速电压的测量，解决目前轫致辐射能谱法仅能等效测试最大加速电压的问题。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.
本发明的目的可以通过以下技术方案实现：The object of the present invention can be achieved by the following technical solutions:
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，该冷测方法包括如下步骤：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:
1)将测试仪器一端口连接加速器谐振腔耦合端口，另一端口连接测试探针；1) Connect one port of the test instrument to the accelerator cavity coupling port and the other port to the test probe;
2)将加速器谐振腔耦合端口调节至耦合匹配状态；2) adjusting the accelerator cavity coupling port to the coupling matching state;
3)在加速缝隙上每隔一定距离取一个测量点，通过测试探针依次测量各 点的传输系数S21；3) taking a measurement point at a certain distance on the acceleration slit, and sequentially measuring the transmission coefficient S21 of each point through the test probe;
[根据细则26改正22.11.2018]
4)根据谐振腔测试等效电路图推导得出
得到测量点的并联阻抗，再根据计算公式 
得到测量点的加速电压，其中P指实际馈入腔体功率。[Correct according to Rule 26 22.11.2018]
4) Based on the equivalent circuit diagram of the cavity test Obtain the parallel impedance of the measurement point, and then according to the calculation formula The accelerating voltage of the measuring point is obtained, where P refers to the actual feed into the cavity power.
4)根据谐振腔测试等效电路图推导得出
4) Based on the equivalent circuit diagram of the cavity test
所述的冷测是加速器谐振腔没有馈入射频功率。The cold test is that the accelerator cavity is not fed with radio frequency power.
所述测试探针由同轴射频电缆并联50欧电阻构成，50欧电阻为谐振频段无感电阻。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.
所述测试探针包括同轴射频电缆内导体、50欧谐振频段无感电阻与同轴射频电缆外导体；同轴射频电缆内导体伸出外导体长度为5cm，内导体与外导体端面齐平处，通过50欧谐振频段无感电阻与同轴射频电缆外导体连接，测试探针底部连接有N型射频接头。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.
所述测试仪器为矢量网络分析仪；矢量网络分析仪一端口连接加速器谐振腔耦合端口，另一端口连接测试探针的N型射频接头。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.
所述步骤2)具体操作为：通过观察阻抗圆图调节耦合匹配状态，若匹配原点在阻抗圆图外部，调节耦合端口扩大耦合量；若匹配原点在阻抗圆图内部，调节耦合端口缩小耦合量，使阻抗圆图过匹配原点,反射系数S11<-25dB。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.
所述步骤3)中一定距离为10mm。A certain distance in the step 3) is 10 mm.
本发明的有益效果：本发明在谐振腔没有馈入功率的条件下,测试换算得到缝隙处加速电压，验证谐振腔物理分析的加速电压的误差值，为高频谐振腔的束流提供可靠的加速电压及束流轨迹分析。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.
为了便于本领域技术人员理解，下面结合附图对本发明作进一步的说明。In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.
图1为本发明谐振腔测试示意图；1 is a schematic diagram of a resonant cavity test of the present invention;
图2为本发明测试探针示意图；2 is a schematic view of a test probe of the present invention;
图3为本发明加速器谐振腔测试等效电路图；3 is an equivalent circuit diagram of the accelerator cavity test of the present invention;
图中：1-加速缝隙；2-加速电压测量点；3-耦合端口；4-加速器谐振腔；5-同轴射频电缆内导体；6-50欧谐振频段无感电阻；7-同轴射频电缆外导体；8-N型射频接头。In the figure: 1-acceleration gap; 2-acceleration voltage measurement point; 3-coupling port; 4-accelerator resonator; 5-coaxial RF cable inner conductor; 6-50 ohm resonance band non-inductive resistor; 7-coaxial RF Cable outer conductor; 8-N type RF connector.
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
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，参见图1、图2，该冷测方法包括：在加速器谐振腔4的加速缝隙1上，每隔10mm取一测量点2；耦合端口3与矢量网络分析仪连接，并转接N型射频接头8；Applying the equivalent parallel impedance to realize the cyclotron accelerating voltage cold chamber test method, see FIG. 1 and FIG. 2, 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;
该冷测方法包括一测试探针，测试探针为并联50欧阻抗探针，由同轴射频电缆并联50欧电阻构成，50欧电阻为谐振频段无感电阻；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;
具体地，同轴射频电缆内导体伸出外导体长度为5cm，内导体与外导体端面齐平处，通过50欧谐振频段无感电阻6与同轴射频电缆外导体7连接，测试探针底部连接有N型射频接头8。Specifically, 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.
本发明中，所述的冷测是加速器谐振腔没有馈入射频功率。In the present invention, the cold test is that the accelerator cavity is not fed with radio frequency power.
本发明中，使用的测试仪器为矢量网络分析仪。In the present invention, the test instrument used is a vector network analyzer.
本发明的实施方法和步骤主要如下：The implementation methods and steps of the present invention are mainly as follows:
1)校准矢量网络分析仪的两端口射频线缆，抵消射频电缆引起的相位移动；1) Calibrate the two-port RF cable of the vector network analyzer to offset the phase shift caused by the RF cable;
2)矢量网络分析仪一端口连接加速器谐振腔耦合端口3，另一端口连接测试探针的N型射频接头8，通过观察阻抗圆图调节谐振腔至耦合匹配状态，若匹配原点在阻抗圆图外部，调节耦合端口扩大耦合量；若匹配原点在阻抗 圆图内部，调节耦合端口缩小耦合量，使阻抗圆图过匹配原点,反射系数S11<-25dB；2) 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;
3)将测试探针放在测试点，同轴射频电缆内导体5接触谐振腔4内的DEE板，同轴射频电缆外导体7接触谐振腔4的外腔体，记录下矢量网络分析仪上显示的传输系数S21，依次测试各点的传输系数S21；3) Place the test probe at the test point, the coaxial RF cable inner conductor 5 contacts the DEE board in the resonant cavity 4, and the coaxial RF cable outer conductor 7 contacts the outer cavity of the resonant cavity 4, and records the vector network analyzer. Displaying the transmission coefficient S21, sequentially testing the transmission coefficient S21 of each point;
[根据细则26改正22.11.2018]
4)根据谐振腔测试等效电路图推导得出得到测量点的并联阻抗，进而根据计算公式 得到测量点的加速电压，其中P指实际馈入腔体功率。[Correct according to Rule 26 22.11.2018]
4) Based on the equivalent circuit diagram of the cavity test Obtain the parallel impedance of the measurement point, and then according to the calculation formula The accelerating voltage of the measuring point is obtained, where P refers to the actual feed into the cavity power.
4)根据谐振腔测试等效电路图推导得出
4) Based on the equivalent circuit diagram of the cavity test
对于谐振腔加速电压的冷测方法，其等效电路如图3所示。图中Z
0为50欧谐振频段无感电阻6。
For the cold measurement method of the resonant cavity accelerating voltage, the equivalent circuit is shown in Figure 3. In the figure, Z 0 is a 50 ohm resonance band with no sense resistor 6.
传输矩阵ABCD(在端口PORT 2A与2B之间)，可以表示为：The transfer matrix ABCD (between ports PORT 2A and 2B) can be expressed as:
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
端口1与2B之间传输矩阵级联，为腔体传输矩阵与平面2A与2B间的传输矩阵的积，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.
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
[根据细则26改正22.11.2018]
式(2)中
由散射S矩阵和传输A矩阵转换关系可得：[Correct according to Rule 26 22.11.2018]
In formula (2) From the scattering S matrix and the transmission A matrix conversion relationship can be obtained:
式(2)中
In formula (2)
S
11＝(A+B/Z
0-CZ
0-D)/E (3)
S 11 =(A+B/Z 0 -CZ 0 -D)/E (3)
S
21＝2/E (4)
S 21 =2/E (4)
S
21＝S
12 (5)
S 21 =S 12 (5)
S
22＝(-A+B/Z
0-CZ
0+D)/E (6)
S 22 =(-A+B/Z 0 -CZ 0 +D)/E (6)
其中among them
E＝A+B/Z
0+CZ
0+D (7)
E=A+B/Z 0 +CZ 0 +D (7)
将新的ABCD系数(2)式带入式(3)，(4)，(5)，(6)中，最终 可以得到并联阻抗Z
0的散射矩阵S：
Bringing the new ABCD coefficient (2) into equations (3), (4), (5), (6), the scattering matrix S of the parallel impedance Z 0 can be finally obtained:
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
[Correct according to Rule 26 22.11.2018]
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
[Correct according to Rule 26 22.11.2018]
在Z
0＜＜R，ξ＜＜1的近似条件下，可知，反射系数S11接近于1，全反射，而反射系数S22接近于0，处在匹配下，端口1和端口2没有都处于全反射。
Under the approximate condition of Z 0 <<R, ξ<<1, it can be seen that the reflection coefficient S11 is close to 1, total reflection, and the reflection coefficient S22 is close to 0. Under the matching, the ports 1 and 2 are not all in the whole. reflection.
通过测量传输系数S21，根据公式(9)，可以求出并行阻抗R：By measuring the transmission coefficient S21, according to the formula (9), the parallel impedance R can be found:
[根据细则26改正22.11.2018]
[Correct according to Rule 26 22.11.2018]
[根据细则26改正22.11.2018]
根据公式得到测量点的加速电压。[Correct according to Rule 26 22.11.2018]
According to the formula The accelerating voltage of the measuring point is obtained.
根据公式
According to the formula
以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节，也不限制该发明仅为所述的具体实施方式。显然，根据本说明书的内容，可作很多的修改和变化。本说明书选取并具体描述这些实施例，是为了更好地解释本发明的原理和实际应用，从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。The preferred embodiments of the invention disclosed above are merely illustrative of the invention. The preferred embodiments are not to be considered in all detail, and the invention is not limited to the specific embodiments. Obviously, many modifications and variations are possible in light of the teachings herein. The present invention has been chosen and described in detail to explain the embodiments of the invention and the invention. The invention is to be limited only by the scope of the appended claims and the appended claims.
本发明在谐振腔没有馈入功率的条件下,测试换算得到缝隙处加速电压，验证谐振腔物理分析的加速电压的误差值，为高频谐振腔的束流提供可靠的加速电压及束流轨迹分析。According to the invention, under the condition that the resonant cavity has no feeding power, 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.
Claims (7)
- [根据细则26改正22.11.2018]
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，其特征在于，该冷测方法包括如下步骤：
1)将测试仪器一端口连接加速器谐振腔耦合端口，另一端口连接测试探针；
2)将加速器谐振腔耦合端口调节至耦合匹配状态；
3)在加速缝隙上每隔一定距离取一个测量点，通过测试探针依次测量各点的传输系数S21；
4)根据谐振腔测试等效电路图推导得出得到测量点的并联阻抗，再根据计算公式得到测量点的加速电压，其中P指实际馈入腔体功率。 [Correct according to Rule 26 22.11.2018]
A method for testing a cyclotron accelerating voltage cold chamber using an equivalent parallel impedance is characterized in that the cold testing method comprises the following steps:
1) Connect one port of the test instrument to the accelerator cavity coupling port and the other port to the test probe;
2) adjusting the accelerator cavity coupling port to the coupling matching state;
3) taking a measurement point at a certain distance on the acceleration slit, and sequentially measuring the transmission coefficient S21 of each point through the test probe;
4) Based on the equivalent circuit diagram of the cavity testObtain the parallel impedance of the measurement point, and then according to the calculation formulaThe accelerating voltage of the measuring point is obtained, where P refers to the actual feed into the cavity power. - 根据权利要求1所述的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，其特征在于，所述的冷测是加速器谐振腔没有馈入射频功率。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 1, wherein the cold measurement is that the accelerator cavity is not fed with radio frequency power.
- 根据权利要求1所述的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，其特征在于，所述测试探针由同轴射频电缆并联50欧电阻构成，50欧电阻为谐振频段无感电阻。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 1, wherein 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. resistance.
- 根据权利要求3所述的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，其特征在于，所述测试探针包括同轴射频电缆内导体、50欧谐振频段无感电阻与同轴射频电缆外导体；同轴射频电缆内导体伸出外导体长度为5cm，内导体与外导体端面齐平处，通过50欧谐振频段无感电阻与同轴射频电缆外导体连接，测试探针底部连接有N型射频接头。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 3, wherein the test probe comprises a coaxial RF cable inner conductor, a 50 ohm resonant band non-inductive resistor and a coaxial RF The outer conductor of the cable; 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 face. The non-inductive resistance of the 50-ohm resonant frequency band is connected with the outer conductor of the coaxial RF cable, and the bottom of the test probe is connected. N type RF connector.
- 根据权利要求1所述的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，其特征在于，所述测试仪器为矢量网络分析仪；矢量网络分析 仪一端口连接加速器谐振腔耦合端口，另一端口连接测试探针的N型射频接头。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 1, wherein 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 other is An N-type RF connector that connects the test probe to one port.
- 根据权利要求1所述的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，其特征在于，所述步骤2)具体操作为：通过观察阻抗圆图调节耦合匹配状态，若匹配原点在阻抗圆图外部，调节耦合端口扩大耦合量；若匹配原点在阻抗圆图内部，调节耦合端口缩小耦合量，使阻抗圆图过匹配原点,反射系数S11<-25dB。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 1, wherein the step 2) is: adjusting the coupling matching state by observing the impedance map, if the matching origin is at the impedance Outside the chart, adjust the coupling port to expand the coupling amount; if the matching origin is inside the impedance chart, adjust the coupling port to reduce the coupling amount, so that the impedance chart crosses the origin, and the reflection coefficient is S11<-25dB.
- 根据权利要求1所述的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，其特征在于，所述步骤3)中一定距离为10mm。The method for testing a cyclotron accelerating voltage cold chamber using the equivalent parallel impedance according to claim 1, wherein a certain distance in the step 3) is 10 mm.
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| CN114217101A (en) * | 2021-10-30 | 2022-03-22 | 荣耀终端有限公司 | Radio frequency test probe structure and radio frequency test system |
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