CN211669374U

CN211669374U - Resonance type online beam position detector

Info

Publication number: CN211669374U
Application number: CN202020235705.2U
Authority: CN
Inventors: 白海涛; 王毅; 何小中; 廖树清; 石金水
Original assignee: Institute of Fluid Physics of CAEP
Current assignee: Institute of Fluid Physics of CAEP
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-10-13
Anticipated expiration: 2030-03-02

Abstract

The utility model discloses an online beam current position detector of resonance formula, including the signal processing spare, still include the detector body of cylinder structure, the inside cavity that is equipped with of detector body, be equipped with the beam current passageway on the detector body, still be equipped with the PCB base member of ring structure in the cavity of detector body, the beam current passageway keeps the axiality with detector body and PCB base member, be equipped with magnetic probe return circuit coil on the PCB base member, the signal processing spare is connected with magnetic probe return circuit coil, still be equipped with metallic gasket in the cavity of detector body, metallic gasket is the both sides that annular array distributes at the PCB base member, metallic gasket one side and beam current access connection, the opposite side is towards magnetic probe return circuit coil. The utility model is used for the beam position and the beam current of accelerator are measured by force, play very important effect to the research and development debugging of accelerator to the continuous micro-pulse of nanosecond level monopulse and nanosecond, this utility model can quick response, and to continuous micro-pulse, can realize the resonance type and measure.

Description

Resonance type online beam position detector

Technical Field

The utility model relates to an accelerator beam measurement field, concretely relates to online beam position detector of resonance type.

Background

The beam detector is compared with the eye of the accelerator, and the accelerator cannot be debugged due to the lack of the beam detector, so that the beam detector is one of important components of the accelerator. From the development of beam detectors, there are mainly a fluorescent target, a faraday cup, a rogowski coil, a strip-type beam detector, a button-type beam detector, a wall current detector, a magnetic probe, and a resonant cavity detector from an early blocking type to a currently popular non-blocking type.

Currently, the commonly used beam detectors include button-type beam detectors and wall current detectors. In practical application, the wall current detector has qualified frequency response and accuracy for pulse beams with rising fronts of tens of nanoseconds, but has no effect on high-frequency oscillation. In addition, the resistance ring of the wall current detector is basically a metal film resistor with 1 ohm, and is connected with an accelerator strong electric system, so that the resistance ring is easily damaged in an experiment and is troublesome to replace; in addition, the conventional beam detector is mostly directed at a single pulse, in addition, for a hundred-nanosecond single pulse, a continuous pulse with a macropulse frequency of hundred hertz can also be treated as a single pulse, for a continuous micropulse with a cycle of nanosecond level, the detector needs to quickly respond to a high frequency, and a band-pass frequency of the detector cannot stagger the continuous micropulse frequency, otherwise, a large signal is difficult to obtain, so that resonance measurement is needed, and a new measurement means needs to be provided for measuring the continuous micropulse with nanosecond level.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome not enough among the prior art, aim at provides an online beam position detector of resonance type for the beam position and the beam current of accelerator are measured by force, play very important effect to the research and development debugging of accelerator, and to the continuous micropulse of nanosecond level monopulse and nanosecond level, this utility model can quick response.

The utility model discloses a following technical scheme realizes:

a resonant online beam position detector comprises a signal processing piece and a detector body with a cylindrical structure, wherein a cavity is arranged in the detector body, beam channels are arranged on two circular surfaces of the detector body and are communicated with the cavity, a PCB (printed circuit board) base body with a circular ring structure is arranged in the cavity of the detector body, and the beam channels, the detector body and the PCB base body keep coaxiality; the PCB substrate is provided with a plurality of magnetic probe loop coils with sector structures, the magnetic probe loop coils are of double-layer structures, the magnetic probe loop coils are distributed on two circular surfaces of the PCB substrate in an annular array mode, and the signal processing part is connected with the magnetic probe loop coils; the metal gaskets are arranged on two sides of the PCB base body, the number of the metal gaskets is the same as that of the magnetic probe return coils, the metal gaskets correspond to the magnetic probe return coils one to one, the metal gaskets are distributed on two sides of the PCB base body in an annular array mode, one side of each metal gasket is connected with the beam current channel, and the other side of each metal gasket is located in the cavity and faces the magnetic probe return coils.

This technical scheme is when the beam current advances in the beam current passageway, according to the knowledge of electrodynamic, can be at the angular direction production angular magnetic induction that the beam current advanced, in the laboratory coordinate system, when the beam current intensity is fixed, the magnetic induction size of a certain point in the laboratory coordinate system is invariable, however, when the beam current is the monopulse form, or when being continuous little pulse distribution form, the magnetic induction of a certain point in the laboratory coordinate system will be changed, utilizes Faraday's electromagnetic induction law: the magnitude of induced electromotive force in the conductor loop is in direct proportion to the change rate of magnetic flux passing through the loop, the magnetic probe loop coil can be designed to be fixed at a certain point in a laboratory coordinate system, when pulse beam current passes near the magnetic probe loop coil, the changed magnetic flux is generated on a coil loop of the magnetic probe loop coil, induced electromotive force is generated on the magnetic probe loop coil and is transmitted to the signal processing part, and the signal processing part is used for analyzing and processing signals, so that the bias and the flow strength of the beam current can be obtained. Simultaneously, this technical scheme is through adjusting the frequency resonance parameter of the whole detector of parameter adjustment such as magnetic probe return coil induction coil bundle number, line width, metal shim thickness, can be used for nanosecond level monopulse beam to measure, realizes the high frequency quick response of nanosecond level particle beam, and the utility model discloses a also can be used for nanosecond level continuous micropulse beam to measure, realize the high frequency quick response to continuous nanosecond level micropulse particle beam, realize the self-integration resonance formula to continuous micropulse and measure.

Furthermore, still be equipped with a plurality of bolt holes on the disc of PCB base member, the bolt hole is the annular array and distributes on the PCB base member, still be equipped with the bolt that quantity is the same with bolt hole quantity on the detector body, the bolt is inserted to the bolt hole, fixes the PCB base member in the cavity of detector body.

The bolt and the bolt hole of design are used for fixing the PCB base member, and the bolt that utilizes setting up on the detector body inserts to the bolt hole on the PCB base member, have realized the fixed to the PCB base member, guarantee that it can stably fix in the cavity of detector body.

Further, magnetic probe return circuit coil is four, and magnetic probe return circuit coil includes a plurality of wirings, a plurality of wiring pad and a plurality of via hole, the wiring distributes uniformly on the disc of PCB base member, the via hole is two rows and runs through on the disc of PCB base member uniformly to the via hole that is located on the same row equals to the distance of PCB base member axis, the both ends and the wiring pad of via hole are connected, and the via hole of adjacent two rows connects the return circuit that forms the intercommunication in proper order through the wiring. The axis of the via hole is parallel to the axis of the PCB base body, the inner diameter of the wiring pad is equal to the inner diameter of the via hole, the outer diameter of the wiring pad is larger than the inner diameter of the via hole, but the distance between the two pads cannot be smaller than the electrical safety distance.

The magnetic probe loop coil is arranged and printed on the circuit board through a printed circuit process, the magnetic probe loop coil is designed to be a double-layer board, the magnetic probe loop coil is arranged on the upper surface and the lower surface of a PCB base material device, a circular plane perpendicular to a circular ring-shaped PCB base body is an axial Z direction of a cylindrical coordinate system to establish a coordinate system, a through hole is parallel to the Z axis direction, the aperture in the through hole is determined according to the PCB process and the size of the PCB base body, and the plating thickness of the through hole is also related to the PCB electroplating process. The via hole is connected with the wiring pad on the upper surface and the lower surface of the coil, the inner aperture of the wiring pad is equal to that of the via hole, and the outer aperture of the wiring pad is larger than that of the via hole, so that the wiring pad is stably connected with the surface wiring of the PCB substrate. In addition, the wiring pads of the coil inner diameter and the wiring pads of the coil outer diameter are arranged on a concentric circle of the circular PCB base device.

Further, the magnetic probe loop coil further comprises joints, the number of the joints is the same as that of the magnetic probe loop coil, the magnetic probe loop coil further comprises joint bonding pads, the joint bonding pads are connected with the wiring, and the joints are inserted into the detector body along the radial direction of the detector body and connected with the joint bonding pads.

The joint is used for being connected with the wiring of the magnetic probe loop coil, so that when the beam current passes through the PCB substrate, induced electromotive force generated on the magnetic probe loop coil loop is transmitted to the signal processing part through the joint, and the intensity of the generated induced electromotive force is measured.

Further, metal gasket is eight, evenly distributes in the both sides of PCB base member, and metal gasket includes first arc piece and second arc piece, the arc length of first arc piece is greater than the arc length of second arc piece to first arc piece one side is connected with the second arc piece, wholly is the lug structure, and the opposite side is connected with the restraint passageway. The first arc-shaped piece and the second arc-shaped piece are coaxial with the detector body, a bolt is arranged on the first arc-shaped piece and fixes the first arc-shaped piece and the detector body, and the second arc-shaped piece is located in a cavity of the detector body and faces towards the magnetic probe loop coil.

The metal gaskets are arranged on two side walls of a cavity of the detector body, the metal gaskets on any one side wall are in 90-degree central symmetry, the size of each metal gasket is related to the number of magnetic probe loop coil loops on the PCB substrate, and the metal gaskets need to be right opposite to the magnetic probe loop coils during installation. The whole circuit of the technical scheme can be analyzed by using a distributed circuit, the beam pipeline is connected with the metal gasket, so that the metal gasket is grounded, the metal gasket is just opposite to the magnetic probe loop coil, the grounding distance between the coil and the beam pipeline is influenced by the raised thickness of the metal gasket (or the thickness of the metal gasket), the distributed capacitance of the detection coil and the beam pipeline is further directly influenced, and the metal gaskets with different thicknesses can be replaced to meet the actual required resonant frequency in the adjustment of the resonant frequency of a later detection cavity.

Further, still include the shell of cylinder structure, the detector body is located the shell, still be equipped with four on the periphery outer wall of detector body and connect the connecting cylinder of one-to-one, connecting cylinder one end and detector body coupling, the other end inserts on the periphery outer wall of shell, connect and insert in the connecting cylinder and be connected with signal processing spare.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to a resonance type online beam position detector, utilize and design magnetic probe return circuit coil and fix in a certain point in the laboratory coordinate system, when the pulse beam passes through near magnetic probe return circuit coil, produce the magnetic flux that changes on the coil return circuit of magnetic probe return circuit coil, consequently can produce the induced electromotive force on magnetic probe return circuit coil, the induced electromotive force transmits to signal processing spare, utilize signal processing spare to carry out analysis processes to the signal, can obtain the bias and the stream intensity of beam;

2. the utility model relates to a resonance type online beam position detector, which can apply the magnetic probe loop coil of the utility model to the beam position and beam current intensity measurement of an accelerator, plays a very important role in the research, development and debugging of the accelerator, and can quickly respond to nanosecond monopulse and nanosecond continuous micropulse;

3. the utility model relates to a resonance type online beam position detector, which influences the distance between a coil and the grounding of a beam pipeline through the thickness of a metal gasket, and further directly influences the distributed capacitance of a detection coil and the beam pipeline, so that the metal gaskets with different thicknesses can be replaced to meet the resonant frequency of actual needs in the adjustment of the resonant frequency of a later detection cavity;

4. the utility model relates to an online beam position detector of resonance formula through means such as adjusting coil bundle number, metal gasket thickness, adjusts monopulse output signal frequency spectrum, can be so that monopulse output frequency spectrum and continuous micropulse resonance, when continuous micropulse is measured, monopulse output frequency spectrum and continuous micropulse frequency spectrum resonance under corresponding frequency, and then increase signal amplitude, realize the resonance formula and measure, improve the SNR.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the detector body of the present invention;

fig. 3 is a schematic structural diagram of the inside of the detector body of the present invention;

fig. 4 is a schematic structural diagram of the PCB substrate of the present invention;

fig. 5 is a schematic diagram of the distribution structure of the magnetic probe loop coil of the present invention;

fig. 6 is a schematic structural diagram of the magnetic probe loop coil of the present invention;

fig. 7 is a schematic structural view of the metal gasket of the present invention;

FIG. 8 is a schematic diagram of a single micropulse;

FIG. 9 is a voltage response of the magnetic probe loop coil in X +, X-, Y +, Y-directions for a single pulse, with beam current 0 biased;

FIG. 10 is a voltage response of a magnetic probe loop coil in each of X +, X-, Y +, and Y-directions for a single pulse with a beam current X + direction biased at 4 mm;

FIG. 11 is a schematic diagram of a series of distributed micropulses;

FIG. 12 is a diagram showing the voltage response of the magnetic probe loop coil in X +, X-, Y +, and Y-directions when the beam current 0 is biased in a continuous distribution of micro pulses;

FIG. 13 shows the voltage response of the magnetic probe loop coil in each of the X +, X-, Y + and Y-directions when the beam current is biased by 4mm in the X + direction in the case of continuously distributed micro pulses;

FIG. 14 is a graph showing the voltage response of the resonant output of the magnetic probe loop coil in each of the X +, X-, Y +, and Y-directions with varying frequency of the continuous micropulse and with a beam current of 0 bias;

FIG. 15 is an equivalent circuit diagram A of the magnetic probe loop coil with distributed capacitance C taken into account;

FIG. 16 is an equivalent circuit diagram B of the magnetic probe loop coil with distributed capacitance C taken into account;

fig. 17 is a schematic diagram of the magnetic probe loop coil detection according to the present invention.

Reference numbers and corresponding part names in the drawings:

the method comprises the following steps of 1-beam channel, 2-shell, 3-connecting cylinder, 4-detector body, 5-metal gasket, 6-joint, 7-PCB base body, 8-bolt hole, 9-magnetic probe loop coil, 10-wiring, 11-via hole, 12-wiring pad, 13-first arc piece, 14-second arc piece and 15-joint pad.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Examples

As shown in fig. 1 to 7, the utility model relates to a resonance type on-line beam position detector, which comprises a signal processing part, wherein the signal processing part is in the prior art, can be an oscilloscope, can also receive time domain signals, can process and operate the time domain signals, and can also be an FPGA; still include detector body 4, detector body 4 is the cylinder structure, and inside is equipped with the cavity, all is equipped with beam current passageway 1 on two planes of detector body to beam current passageway 1 sets up with 4 axialities of detector body, and wherein the beam current passageway 1 of one side is connected with the accelerator, makes the interior beam current of accelerator can get into to detector body 4 in through beam current passageway 1, and the beam current detector among this technical scheme installs on the position of the corresponding survey beam current of answering, for example: the technical scheme can be applied to any beam measurement environment which can be applied to the technical scheme, and the technical scheme is not specific to beam measurement of a specific type of accelerator.

A PCB (printed circuit board) matrix 7 is arranged in the cavity of the detector body 4, the PCB matrix 7 is of a circular ring structure, and the PCB matrix 7 and the detector body 4 keep coaxial, so that the beam in the beam channel 1 can pass through the PCB matrix 7; still be equipped with a plurality of bolt holes 8 on PCB base member 7's the torus, bolt hole 8 is that the ring battle array distributes evenly on PCB base member 7, still be equipped with the bolt that quantity and 8 quantity of bolt holes are the same on detector body 4, the bolt is non-metallic material, and the bolt inserts to bolt hole 8 in, utilizes the setting at bolt and 8 cooperation in bolt holes, fixes PCB base member 7 in the cavity of detector body 4, avoids rocking of PCB base member in detector body 4.

The circular ring surface of the PCB base body 7 is also provided with four magnetic probe loop coils 9 with a sector structure, each magnetic probe loop coil 9 comprises a plurality of wirings 10, a plurality of wiring pads 12, pads 15 and a plurality of through holes 11, the wiring pads 12 are distributed on the two circular ring surfaces of the PCB base body 7 in an upper group and a lower group, each group of wiring pads 12 is distributed on the circular ring surface of the PCB base body 7 in two rows along the radial direction of the PCB base body 7, the distances from the wiring pads 12 on each row to the axis of the PCB base body 7 are opposite to form an arc-shaped section, the connecting line of two adjacent wiring pads 12 between the two rows passes through the axis of the PCB base body 7, and the distance between the two adjacent wiring pads 12 between the two rows is ensured to be more than a safe electrical distance; the through hole 11 penetrates through the PCB base body 7, two groups of wiring pads 12 on the upper and lower circular surfaces of the PCB base body 7 are connected by two ends of the through hole 11, namely, the wiring pad 12 on one circular surface of the PCB base body 7 is connected with the corresponding wiring pad 12 on the other circular surface through the through hole 11, the wiring pads 12 on the upper and lower surfaces of the PCB base body 7 are connected by using the arranged through hole 11, a through hole is arranged on the wiring pad 12, the inner diameter of the through hole is consistent with the outer diameter of the through hole 11, the through hole 11 is positioned in the through hole of the wiring pad 12, and the outer diameter of the arranged wiring pad 12 is larger than that of the through hole 11, so that the wiring pad 12 can be effectively contacted with the PCB base body 7, and the wiring pad 12; the wiring 10 is distributed on two ring surfaces of the PCB base body 7, the wiring 10 connects via holes 11 and wiring pads 12 on two rows of the PCB base body 7 one by one to form a loop which is communicated in sequence, namely, two wirings 10 on the upper surface and the lower surface of the PCB base body 7 and two corresponding via holes 11 form a bundle of coils, the spiral coil is similar to the bundle of the spiral coils, the line width of the wiring 10 is reasonably designed according to the PCB printing process and the requirement, and the wiring thickness is related to the PCB printing circuit electroplating process.

The loop bundle number of the magnetic probe loop coil 9, the length and width of the wiring 10 connecting the two wiring pads 12 and the size of the wiring pads 12 all affect the inductance of the coil and the distributed capacitance between the coil and the detection cavity, so that the size of each dimension can be flexibly selected by measuring the beam type according to actual needs, and the measurement of beams of different types is met.

The two sides of the PCB base body 7 are respectively provided with four metal gaskets 5, the four metal gaskets 5 are distributed on the inner wall of the cavity of the detector body 4 in a circular ring array mode, each metal gasket 5 comprises a first arc-shaped piece 13 and a second arc-shaped piece 14, the arc length of each first arc-shaped piece 13 is larger than that of each second arc-shaped piece 14, each second arc-shaped piece 14 is located on each first arc-shaped piece 13 and is in an overall convex structure, each first arc-shaped piece 13 is provided with a bolt, each bolt is fixed with the detector body 4, each first arc-shaped piece 13 is fixed on the detector body 4 through the arranged bolt, the beam current pipeline 1 is connected with each first arc-shaped piece 13, each second arc-shaped piece 14 is located in the cavity of the detector body 4, each second arc-shaped piece 14 corresponds to each magnetic probe loop 9 on the PCB base body 7, the first arc-shaped piece 13 and each second arc-shaped piece 14 are coaxial with the beam current pipeline 1, the arc length of the second arc piece 14 is larger than the sector area formed by the magnetic probe loop coil 9, so that the second arc piece 14 of the sector has enough allowance to be aligned with the magnetic probe loop coil 9; the thickness of the second arc-shaped piece 14 influences the grounding distance between the coil and the beam pipeline, and further directly influences the distributed capacitance between the detection coil and the beam pipeline, so that the metal gaskets with different thicknesses can be replaced to meet the actual required resonant frequency in the adjustment of the resonant frequency of the later-stage detection cavity.

The magnetic probe loop coil 9 further comprises joints 6, the number of the joints 6 is the same as that of the magnetic probe loop coil 9, the magnetic probe loop coil 9 further comprises joint pads 15, the joint pads 15 are connected with wiring 10, the joints 6 are inserted into the probe body 4 along the radial direction of the probe body 4 and connected with the joint pads 10, and the joints 6 are connected with the signal processing part, so that induced electromotive force generated by the magnetic probe loop coil 9 can be transmitted to the signal processing part through the joints 6, and the magnitude of the induced electromotive force generated by the magnetic probe loop coil 9 is measured.

Still include the shell 2 of cylinder structure, detector body 4 is located shell 2, and the shell of setting is used for interior detector body 4 to protect, makes it place in the shell, still be equipped with four on the periphery outer wall of detector body 4 and connect 6 one-to-

one connecting cylinder

3, 3 one end of connecting cylinder are connected with detector body 4, and the other end inserts on the periphery outer wall of shell 2, connect 3 inserts in connecting cylinder 3.

The loop inductance L is influenced by the loop number and the line width of the magnetic probe loop coil, the loop coil is equivalent to a spiral coil, the larger the loop number is, the larger the spiral coil inductance is, the smaller the loop number is, and the smaller the spiral coil inductance is.

The line width and the sheet metal thickness influence the distance between the coil and the pipeline wall, and the larger the sheet metal thickness is, the smaller the distance between the coil and the pipeline wall is. Here, the formula of parallel capacitive plates can be considered:

as the distance d between the sheet metal and the duct wall decreases, the capacitance C increases. In addition, the beam detection beam can consider an integrated circuit model:

when the beam is transmitted in the beam transmission pipeline, if the size of the magnetic probe loop coil is far smaller than the electron beam cyclotron wavelength, the magnetic probe loop coil can be used as a lumped parameter element, and the magnetic probe loop coil can be considered as an inductance L. And when the beam current flows through the pipeline, an induced electromotive force is generated on the magnetic probe loop, drives an inductor L and is transmitted to the oscilloscope through the external long cable, and the characteristic impedance of the long cable is considered to be R. Then, the magnetic probe loop coil can perform element analysis of the seed collection parameters, and the probe can be equivalent to an inductor which is connected in series with a resistor and is driven by induced electromotive force.

Analysis of the magnetic probe loop coil resonant circuit, as shown in FIGS. 15-16, the equivalent circuit diagram of the magnetic probe loop coil with the distributed capacitance C taken into account, the impedance Z of the distributed capacitance C in parallel with the characteristic impedance R of the cable₀，

Thus, the total loop impedance is obtained as:

during resonance, electric field energy and magnetic field energy interconversion in the circuit, inductive reactance and capacitive reactance performance do not consume energy, therefore the formula imaginary number part is zero during resonance:

thus, when resonance is obtained, the resonance angular frequency ω satisfies:

thus, the magnetic probe loop coil integrated circuit analysis S is obtained₂₁The resonant frequency f of the parameter satisfies:

the coil bundle affects inductance L, coil width and metal pad thickness affecting capacitance C, both affecting S as formula (4)₂₁The resonant frequency f of the parameter. S above₂₁Represents: and when all the other ports are connected to the matched load, the transmission coefficient from one end port to the other end port of the beam channel 1 is obtained.

Fig. 17 shows a total of 4 magnetic probe loop coil detectors, which are: probe 1-4. The radius of the beam pipeline is R, the beam intensity is I, the beam flows through the beam pipeline, the distance from the axis of the pipeline to the axis of the pipeline is offset to R, and theta is the included angle between the measured position (Probe1) and the radial position of the beam. The magnetic induction intensity on the pipeline wall can be obtained by superposing a beam I and an imaginary mirror image beam I, and the offset distance between the mirror image beam and the axial direction of the pipeline is R²And/r, obtaining the angular magnetic induction intensity as follows:

where ρ ═ R/R denotes the normalized amplitude value of the beam current with respect to the lateral offset of the transmission duct, B₀The magnetic induction intensity value of the beam current at the center of the pipeline is as follows:

equation (4-1) can be expanded as:

B(R,θ)＝B₀·(1+2ρcosθ+...) (4-2)

when rho is small, neglecting high-order terms, the angular magnetic induction intensity generated on the loop of the 4 magnetic probes is respectively as follows:

the magnetic Probe loop coil is designed to be placed at the 4 detector positions in fig. 17, when a pulse beam passes through the vicinity of the magnetic Probe loop coil, a changing magnetic flux is generated on the magnetic Probe loop coil, so that induced electromotive force is generated on the magnetic Probe loop coil, and according to the formula (4-3), the magnetic induction intensities generated on probes 1-4 are different when the beam is biased, so that the induced electromotive force on Probe1-4 is also different, and the beam information can be obtained by processing the induced electromotive force on Probe 1-4.

Whether the magnetic probe loop coil works in the self-integration or differentiation condition, the voltage signal V (t) and the beam current intensity signal I (t) measured by the magnetic probe loop coil can be written as follows:

in the equations (4-10), k represents the integral or differential voltage division coefficient of the test loop. When ω L > R, k represents an integral coefficient, and when ω L < R, k represents a voltage dividing coefficient. And (3) processing the magnetic induction intensity information on the Probe1-4 to obtain:

obtained according to equations (4-11):

thus, a measured voltage signal V is obtained₁、V₂、V₃、V₄And (4) processing according to a formula (4-12), and obtaining the beam intensity I (t) and the transverse offsets delta x and delta y after obtaining the coefficient k according to a calibration device.

In addition, the beam bias information can be obtained by adopting the methods of difference ratio sum, amplitude-phase conversion and logarithmic ratio. The beam processing methods are all disclosed.

According to the technical scheme, S parameters of continuous micro-pulses need to be adjusted, the S parameters of the whole detection element need to be adjusted through a network analyzer, and the resonance frequency of the detector is guaranteed to be integral multiple of the beam micro-pulse frequency. Under the condition that the detection cavity is fixed, parameters such as the number of loops of the magnetic probe, the line width, the thickness of the metal gasket and the like can be adjusted to adjust the frequency of the whole detection element, so that the S21 parameter band-pass resonance frequency of the detector is integral multiple of the frequency of continuous micro-pulses. After the resonance parameters are measured, the detector of the utility model needs to be calibrated at the calibration platform, and the beam detection part of the accelerator is installed on the calibrated detector. When the pulse beam passes through the vicinity of the magnetic probe loop coil, a changing magnetic flux is generated on a coil loop of the magnetic probe loop coil, so that induced electromotive force is generated on the magnetic probe loop coil, the induced electromotive force can be transmitted to an external signal processing part through a coaxial connecting wire, and the bias and the flow intensity of the beam can be obtained by analyzing and processing signals.

Through the utility model discloses, can be applied to the beam position and the beam current of accelerator with utility model's magnetic probe return circuit coil and measure, play very important effect to the research and development debugging of accelerator to nanosecond level monopulse and nanosecond level continuous micropulse, this utility model can quick response. As shown in fig. 8, a single pulse magnetic probe loop coil designed by the present invention, taking fig. 1 as an example, establishes a coordinate system in an axial Z direction which is perpendicular to a circular plane of a circular PCB substrate and is a cylindrical coordinate system, a via hole is parallel to the Z axis direction, a horizontal direction is perpendicular to the Z axis direction and is an X axis, a vertical direction is perpendicular to the Z axis and is a Y axis, when a beam current is biased at 0, a voltage response of each detector is obtained through simulation of a CST particle operating chamber as shown in fig. 9, and when the beam current is biased at 4mm in the X direction, an obtained result is shown in fig. 10; the continuous micro-pulse shown in fig. 11 is obtained by simulating a CST particle operating chamber through the detector designed by the present invention when the beam current is 0 offset, and the voltage response of each detector is shown in fig. 12, and when the beam current is offset to the X direction by 4mm, the obtained result is shown in fig. 13, and the simulation result shows that when the beam current is 0 offset, the voltage output of the magnetic probe loop coil in each direction is the same, and when the beam current is offset by 4mm in the X + direction, the voltage output of the magnetic probe loop coil in the X +, X-, Y +, and Y-directions is different, so that the voltage signals in the four directions can be analyzed and processed to obtain the position and the intensity of the particle beam current in the accelerator. By means of adjusting the number of coils, the thickness of a metal gasket and the like, the frequency spectrum of the single-pulse output signal is adjusted, and the single-pulse output frequency spectrum and the continuous micro-pulse can resonate. During the continuous micro-pulse measurement, the single-pulse output spectrum and the continuous micro-pulse spectrum resonate at corresponding frequencies, so that the signal amplitude is increased, the resonance measurement is realized, the signal-to-noise ratio is improved, and as shown in fig. 14, the measurement signals are stronger than one another.

It can be seen from fig. 9 and fig. 10 that, for the detector of the present invention, the energy oscillates between the magnetic probe loop coil detection coil and the detection cavity, and therefore, the voltage output has a corresponding period, and after the resonant frequency is adjusted, for the micro-pulses distributed continuously, the voltage output of the detector to the rear pulse is superposed on the voltage output of the front pulse, and if the bandpass resonant frequency of the detector is guaranteed to be an integral multiple of the frequency of the continuous micro-pulses, the resonance enhanced measurement can be realized. In addition, fig. 9, fig. 10, fig. 12, fig. 13 and fig. 14 show that the output model of the detector has self-integration property, so the utility model is an online self-integration resonance beam detector. It should be noted that voltages in four directions in fig. 9 and 12 and fig. 14 are superposed because the beam current bias is 0 and the four detectors are 90 ° center-rotation symmetric.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A resonance type online beam position detector comprises a signal processing piece and is characterized by further comprising a detector body (4) with a cylindrical structure, wherein a cavity is arranged inside the detector body (4), beam channels (1) are arranged on two circular surfaces of the detector body (4), the beam channels (1) are communicated with the cavity, a PCB (printed circuit board) base body (7) with a circular ring structure is further arranged in the cavity of the detector body (4), and the beam channels (1), the detector body (4) and the PCB base body (7) keep coaxiality;

the PCB base body (7) is provided with a plurality of magnetic probe loop coils (9) with double-layer structures, the magnetic probe loop coils (9) are distributed on two circular ring surfaces on the PCB base body (7) in an annular array, and the signal processing part is connected with the magnetic probe loop coils (9);

the metal gaskets (5) with the same number as the magnetic probe loop coils (9) are arranged on the two sides of the PCB base body (7), the metal gaskets (5) correspond to the magnetic probe loop coils (9) one by one, and the metal gaskets (5) are distributed on the two sides of the PCB base body (7) in an annular array; one side of the metal gasket (5) is connected with the beam current channel (1), and the other side of the metal gasket is positioned in the cavity and faces the magnetic probe loop coil (9).

2. A resonant on-line beam position detector according to claim 1, wherein the circular surface of the PCB substrate (7) is further provided with a plurality of pin holes (8), the pin holes (8) are distributed on the PCB substrate (7) in an annular array, the detector body (4) is further provided with pins having the same number as the pin holes (8), and the pins are inserted into the pin holes (8) to fix the PCB substrate (7) in the cavity of the detector body (4).

3. A resonant online beam position detector according to claim 1, characterized in that the number of the magnetic probe loop coils (9) is four, and the number of the metal pads (5) on both sides of the PCB substrate (7) is four.

4. A resonant online beam current position detector according to claim 1, wherein the magnetic probe loop coil (9) comprises a plurality of wires (10), a plurality of wire pads (12) and a plurality of vias (11), the vias (11) are arranged in two rows and uniformly penetrate through the circular ring surface of the PCB substrate (7), the distance from the vias (11) on the same row to the axis of the PCB substrate (7) is equal, the two ends of the vias (11) are connected with the wire pads (12), the wires (10) are distributed on the two circular rings of the PCB substrate (7), and the wires (10) are connected with the wire pads (12) and the two vias (11) in the same radial direction of the PCB substrate (7) to form a sequentially connected loop.

5. A resonant in-line beam current position detector according to claim 4, characterized in that the axis of the via hole (11) is parallel to the axis of the PCB base (7), the inner diameter of the wiring pad (12) is equal to the inner diameter of the via hole, and the outer diameter of the wiring pad (12) is larger than the inner diameter of the via hole.

6. A resonant online beam current position detector according to claim 4, characterized in that the magnetic probe loop coil (9) further comprises the same number of tabs (6) as the number of magnetic probe loop coils (9), the magnetic probe loop coil (9) further comprises tab pads (15), the tab pads (15) are connected with the wiring (10), and the tabs (6) are inserted into the detector body (4) along the radial direction of the detector body (4) and connected with the tab pads (15).

7. The resonant online beam position detector according to claim 1, wherein the metal gasket (5) comprises a first arc-shaped piece (13) and a second arc-shaped piece (14), the arc length of the first arc-shaped piece (13) is greater than that of the second arc-shaped piece (14), one side of the first arc-shaped piece (13) is connected with the second arc-shaped piece (14), the whole body is in a convex structure, and the other side of the first arc-shaped piece is connected with the beam channel (1).

8. A resonant online beam position detector according to claim 7, wherein the first arc-shaped piece (13) and the second arc-shaped piece (14) are coaxial with the detector body (4), the first arc-shaped piece (13) is provided with a bolt, the bolt fixes the first arc-shaped piece (13) and the detector body (4), and the second arc-shaped piece (14) is located in the cavity of the detector body (4) and faces the magnetic probe loop coil (9).

9. The resonant online beam position detector according to claim 1, further comprising a cylindrical housing (2), wherein the detector body (4) is located in the housing (2), four connecting cylinders (3) corresponding to the connectors (6) one by one are further disposed on an outer peripheral wall of the detector body (4), one end of each connecting cylinder (3) is connected to the detector body (4), the other end of each connecting cylinder is inserted into the outer peripheral wall of the housing (2), and the connectors (6) are inserted into the connecting cylinders (3) and connected to the signal processing unit.