Calibration system for beam position detector

A beam current position, calibration system technology, applied in the direction of instruments, radiation measurement, etc., can solve the problems of reflection, different response frequency range, narrow system application area, etc., to achieve good impedance matching, wide application, simple structure. Effect

Pending Publication Date: 2022-03-04
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0012] 2. The transmission efficiency of the signal is not high
The characteristic impedance of the coaxial cable is 50Ω, and the characteristic impedance of the free-space plane wave is 377Ω. The impedance mismatch and the jump change cause most of the power to be reflected, and multiple reflections will cause additional reading errors.
[0013] 3. The application of the system is narrow
Usually the BPM calibration system can only be used for BPM measurement. The difficulty for other DUTs is that different DUTs need to measure different response frequency ranges.
Generally, the operating frequency of electron accelerator B

Method used

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  • Calibration system for beam position detector
  • Calibration system for beam position detector
  • Calibration system for beam position detector

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[0054] The invention will be described in detail below with reference to the accompanying drawings and examples.

[0055] The present invention develops a single-wire transmission line that uses surface electromagnetic waves proposed in 1950 to complete BPM calibration experiments.

[0056] Such as image 3 As shown, it is assumed that there is a metal line (Gaobou-line, referred to as a radius, indicating a dielectric material having a thickness of D = b-a, coupled with the outer radius of the coating to B. The cylindrical coordinates are used and assume that the system has a periodic structure in the z direction. In the dielectric, electromagnetic field distribution is made from the Bezier function J n (x) and Nocman function Y n (x) Cooperate, in the interior of the dielectric material, 即 ≤ R ≤ B, is:

[0057]

[0058]

[0059] E z = IA [j 0 (γ) d r) + my 0 (γ) d r)] E -i(ωt-lz) (4-1C)

[0060] Where A is the amplitude factor of the electromagnetic field, m is a function det...

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Abstract

The invention discloses a beam position detector calibration system, which is characterized by comprising a coaxial line, a conical emitter, a Gaobu line, a conical receiver, an absorption load, a mobile platform and a signal recording subsystem, wherein one end of the coaxial line is connected with the top end of the conical emitter, and the coaxial line is used for inputting a signal generated by a signal source into the conical emitter; the tail end of the conical emitter is connected with one end of the Gaobou line, and the conical emitter is used for gradually transiting a TEM wave input by a coaxial line to a TM mode surface wave and inputting the TM mode surface wave into the Gaobou line for transmission; the other end of the Goubau line is connected with the tail end of the conical receiver, and the Goubau line is used for inputting the input TM mode surface wave into the conical receiver; the top end of the conical receiver is connected with the absorption load, and the conical receiver is used for inputting a received signal to the absorption load; and the mobile platform is used for carrying an object to be calibrated to move along the Gaobou line.

Description

technical field [0001] The invention belongs to the technical field of particle accelerators and relates to a novel beam position detector calibration system. Background technique [0002] The Beam Position Monitor (BPM) is the "eye" of the particle accelerator, which is used to observe the position of the beam in the pipeline and realize precise control of the beam position to ensure normal operation. When the beam passes through the BPM, a certain amplitude voltage signal U will be generated on the output electrode welded on the pipeline, such as figure 1 As shown, the signal is inversely proportional to the distance d between the beam current and the electrode, and the position of the beam current can be obtained by comparing the signal of the opposite electrode, that is, there is: [0003] [0004] Where x is the position of the beam, the coefficient k is also called the sensitivity of BPM, and δ is the offset offset of the geometric center relative to the electrical...

Claims

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Application Information

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IPC IPC(8): G01T7/00
CPCG01T7/005
Inventor 何俊随艳峰岳军会曹建社王安鑫李勇汪林麻惠洲杜垚垚于令达赵颖魏书军徐韬光叶强
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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