阅读说明：本技术 一种质子束流强度及截面测量装置 (Proton beam flow intensity and cross section measuring device ) 是由 温立鹏 郑侠 管锋平 汪洋 于 2019-12-18 设计创作，主要内容包括：本发明涉及质子束流线测量技术领域,公开了一种质子束流强度及截面测量装置,包括真空室、束流管道,真空室的下部与束流管道的上部相接通,所述真空室的上方安装有气缸,气缸的活塞杆竖直向下,且活塞杆的下端固定连接有位于真空室或束流管道内腔的束流阻挡体、荧光靶片,气缸的活塞杆可分别带动束流阻挡体、荧光靶片移动至束流管道内质子束流截面的位置,本发明的测量装置能够在有限的空间内对质子回旋加速器束流线的质子束流强度及截面进行精确测量。(The invention relates to the technical field of proton beam streamline measurement, and discloses a proton beam intensity and section measuring device which comprises a vacuum chamber and a beam pipeline, wherein the lower part of the vacuum chamber is communicated with the upper part of the beam pipeline, an air cylinder is arranged above the vacuum chamber, a piston rod of the air cylinder is vertically downward, the lower end of the piston rod is fixedly connected with a beam blocking body and a fluorescent target sheet which are positioned in the inner cavity of the vacuum chamber or the beam pipeline, and the piston rod of the air cylinder can respectively drive the beam blocking body and the fluorescent target sheet to move to the position of the proton beam section in the beam pipeline.)

1. The utility model provides a proton beam current intensity and cross-section measuring device, includes vacuum chamber (1), beam pipeline (2), and the lower part of vacuum chamber (1) communicates with the upper portion of beam pipeline (2) mutually, characterized by: the utility model discloses a camera, including vacuum chamber (1), cylinder (3) is installed to the top of vacuum chamber (1), piston rod (4) of cylinder (3) are vertical downwards, and the lower extreme fixedly connected with of piston rod (4) is located beam blocking body (5) of vacuum chamber (1) or beam pipeline (2) inner chamber, fluorescence target plate (6), piston rod (4) of cylinder (3) can drive beam blocking body (5) respectively, fluorescence target plate (6) move to the position of beam flow cross-section (11) in beam pipeline (2), beam blocking body (5) block proton beam and produce weak current signal, beam pipeline (2) outside is equipped with reflector (7), camera (8), the fluorescence that proton beam arouses fluorescence target plate (6) to produce is transmitted to the camera lens of camera (8) through reflector (7) reflection.

2. The apparatus of claim 1, wherein: fixed bolster (15) are installed to the upper end of vacuum chamber (1), the cylinder body fixed mounting of cylinder (3) is on fixed bolster (15), through-hole (14) have been seted up to the upper end of vacuum chamber (1), through-hole (14) external sealing is connected with bellows (12), the other end sealing connection of bellows (12) has sealed dish (16), the upper portion fixed connection of piston rod (4) lower extreme and sealed dish (16) of cylinder (3), the lower part fixedly connected with connecting rod (13) of sealed dish (16), the beam stops body (5), fluorescence target piece (6) all are fixed in on connecting rod (13).

3. The apparatus of claim 1, wherein: and a shielding cover (9) is arranged at the periphery of the beam current blocking body (5), and a weak current signal generated by the beam current blocking body (5) is input to a data acquisition system through a weak current signal amplifying circuit.

4. The apparatus of claim 1, wherein: the beam current blocking body (5) is made of tungsten or molybdenum.

5. The apparatus according to any one of claims 1 to 4, wherein: an observation window (10) is arranged on the side wall of the vacuum chamber (1) or the beam pipeline (2), and fluorescence generated by exciting the fluorescence target (6) by the proton beam passes through the observation window (10) and is transmitted to the reflector (7) and is reflected by the reflector (7) and transmitted to the lens of the camera (8).

6. The apparatus of claim 5, wherein: the number of the reflectors (7) is two, the reflectors (7) are plane mirrors or triangular prisms, and the fluorescence is reflected and transmitted to the lens of the camera (8) through the two correspondingly arranged plane mirrors or triangular prisms.

7. The apparatus of claim 4, wherein: the surface of the fluorescent target sheet (6) is coated with a fluorescent material, and the fluorescent target sheet (6) is made of quartz glass.

8. The apparatus according to any one of claims 1 to 4, wherein: the cylinder (3) is a two-stage telescopic cylinder, a first-stage piston rod of the cylinder (3) extends out and drives the fluorescent target (6) to move to the position of the proton beam section (11), and a second-stage piston rod of the cylinder (3) extends out and drives the beam blocking body (5) to move to the position of the proton beam section (11).

9. The apparatus according to any one of claims 1 to 4, wherein: the cross section of the vacuum chamber (1) is rectangular, and the cross section of the beam current pipeline (2) is arc-shaped.

10. The apparatus according to any one of claims 1 to 4, wherein: the shielding cover (9) is made of an electromagnetic shielding material.

Technical Field

The invention relates to the technical field of proton beam streamline measurement, in particular to a proton beam flow intensity and section measuring device.

Background

Radiotherapy is an important means for cancer therapy, and proton therapy has a very prominent advantage and has been rapidly developed in recent years. The intensity and cross-section of the proton beam is a very important parameter in the proton therapy of cancer. The proton beam intensity is related to the dose rate, which directly relates to the life safety of the treated person, so the proton beam intensity needs to be measured. The method can be used for measuring the beam intensity by using the magnetic field of the charged beam by adopting an induction type measuring principle, and can realize online real-time measurement. Compared with induction type measurement, the intensity measurement of the weak current proton beam can be more accurately carried out by adopting a blocking type measurement principle, and the method is more suitable for proton treatment with lower beam intensity. However, proton beam energy used for proton treatment is high, the range in the beam stopper is large, and the material selection of the beam stopper is more important.

In the process of beam debugging, the beam cross section needs to be measured, and in the process of beam debugging and proton treatment, various parameters need to be adjusted according to the measured cross section, so that the high beam transmission efficiency on a transmission line is ensured, the residual dosage is reduced, and the equipment maintenance is facilitated.

The proton treatment beam line has more devices including magnets, energy reducers and the like, and part of the beam line is positioned in the rotating rack, so that the longitudinal and transverse spaces of the beam diagnostic element are limited, and the proton beam intensity and section measurement needs to be completed in the limited space.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a proton beam intensity and section measuring device which can accurately measure the proton beam intensity and section of a proton cyclotron beam flow line in a limited space.

The technical purpose of the invention is realized by the following technical scheme:

a proton beam flow intensity and section measuring device comprises a vacuum chamber and a beam flow pipeline, wherein the lower part of the vacuum chamber is communicated with the upper part of the beam flow pipeline, an air cylinder is arranged above the vacuum chamber, a piston rod of the air cylinder is vertically downward, the lower end of the piston rod is fixedly connected with a beam flow blocking body and a fluorescent target sheet which are positioned in the vacuum chamber or in the inner cavity of the beam flow pipeline, the piston rod of the air cylinder can respectively drive the beam flow blocking body and the fluorescent target sheet to move to the position of the proton beam flow section in the beam flow pipeline, the beam flow blocking body blocks a proton beam to generate a weak current signal, a reflector and a camera are arranged on the outer side of the beam flow pipeline, and fluorescence generated by exciting the fluorescent.

By adopting the technical scheme, the piston rod of the air cylinder extends out to drive the beam current blocking body to move down to the position of the cross section of the proton beam current, so that the proton beam current is completely blocked, and the current generated when the beam current blocking body blocks the proton beam current is measured, so that the intensity information of the proton beam current is obtained. A piston rod of the air cylinder extends out to drive the fluorescence target plate to move downwards to the position of the proton beam cross section, the proton beam excites fluorescence generated by the fluorescence target plate to acquire images through the reflector and the camera, the beam cross section is measured through the fluorescence target, and the proton beam cross section information can be obtained very visually.

The invention is further set that a fixed support is arranged at the upper end of the vacuum chamber, the cylinder body of the air cylinder is fixedly arranged on the fixed support, a through hole is formed in the upper end of the vacuum chamber, a telescopic corrugated pipe is connected outside the through hole in a sealing mode, the other end of the telescopic corrugated pipe is connected with a sealing disc in a sealing mode, the lower end of a piston rod of the air cylinder is fixedly connected with the upper portion of the sealing disc, a connecting rod is fixedly connected to the lower portion of the sealing disc, and the beam blocking body.

By adopting the technical scheme, the inner cavity of the vacuum chamber is in a vacuum state, the inner cavity of the telescopic corrugated pipe is communicated with the inner cavity of the vacuum chamber and is in a vacuum state, two ends of the telescopic corrugated pipe are respectively in sealing connection with the through hole and the sealing disc, and the beam current blocking body and the fluorescent target sheet can be driven to move up and down by extending or contracting the piston rod of the air cylinder, so that the vacuum requirement in the vacuum chamber is met.

The invention is further set that a shielding cover is arranged at the periphery of the beam current blocking body, and a weak current signal generated by the beam current blocking body is input to the data acquisition system through the weak current signal amplifying circuit.

By adopting the technical scheme, the shielding cover is arranged outside the beam current blocking body in a surrounding mode, only the proton beam current path is reserved, a good electromagnetic shielding effect is provided for the weak current signals, and the weak current signals generated by the beam current blocking body are amplified by the weak current signal amplifying circuit and then input to the data acquisition system to obtain the intensity information of the proton beam current.

The invention is further configured that the beam current blocking body is made of tungsten or molybdenum.

By adopting the technical scheme, the proton beam strikes the beam stopper to generate high temperature, the beam stopper is made of tungsten or molybdenum and has a higher melting point, the proton beam range in the beam stopper is reduced, and the thickness of the beam stopper is favorably reduced, so that the normal use of the beam stopper is ensured.

The invention is further arranged in that the side wall of the vacuum chamber or the beam current pipeline is provided with an observation window, and the fluorescence generated by exciting the fluorescence target plate by the proton beam current passes through the observation window and is transmitted to the reflector, and is reflected by the reflector and transmitted to the lens of the camera.

By adopting the technical scheme, the fluorescence generated by the fluorescence target passes through the observation window and is transmitted to the lens of the camera through the reflection of the reflector, so that the aim of fluorescence collection is fulfilled on one hand, and the camera is far away from a radiation field on the other hand, thereby prolonging the service life of the camera.

The invention is further provided with two reflectors, the reflectors are plane mirrors or triangular prisms, and the fluorescence is reflected and transmitted to the lens of the camera through the two correspondingly arranged plane mirrors or triangular prisms.

By adopting the technical scheme, the reflector is a plane mirror or a triangular prism and is provided with two corresponding arrangements to form a reflection light path of light, and fluorescence generated by the fluorescence target plate is transmitted to the lens of the camera through the reflection light path.

The invention is further set that the surface of the fluorescent target sheet is coated with fluorescent material, and the fluorescent target sheet is made of quartz glass.

By adopting the technical scheme, the surface of the proton beam excited fluorescence target plate is coated with the fluorescent material with the fluorescence function, and the quartz glass has the high-temperature resistance, so that the normal use of the fluorescence target plate is ensured.

The invention is further set that the cylinder is a two-stage telescopic cylinder, a first-stage piston rod of the cylinder extends out and drives the fluorescent target plate to move to the position of the proton beam cross section, and a second-stage piston rod of the cylinder extends out and drives the beam blocking body to move to the position of the proton beam cross section.

By adopting the technical scheme, the extension or the contraction of the first-stage piston rod and the second-stage piston rod of the second-stage telescopic cylinder reach different working positions, so that the beam flow blocking body and the fluorescent target sheet are switched between different working positions, and the operation and the control are convenient.

The invention is further configured such that the cross-section of the vacuum chamber is rectangular and the cross-section of the beam conduit is arc-shaped.

By adopting the technical scheme, the vacuum chamber and the beam pipeline are designed in an integrated manner, so that the longitudinal space of the beam pipeline is greatly saved, and the problem of tension of the beam line longitudinal space of a proton treatment system is solved.

The invention is further arranged that the shielding cover is made of electromagnetic shielding material.

By adopting the technical scheme, the electromagnetic shielding material has better electromagnetic shielding performance, so that the weak current signal generated by the beam current blocking body is ensured not to be influenced by external electromagnetic radiation.

In conclusion, the beneficial technical effects of the invention are as follows:

the piston rod of the cylinder extends out to drive the beam current blocking body to move down to the position of the cross section of the proton beam current, so that the proton beam current is completely blocked, and the current generated when the beam current blocking body blocks the proton beam current is measured, so that the intensity information of the proton beam current is obtained. The piston rod of the cylinder extends out to drive the fluorescence target plate to move downwards to the position of the proton beam cross section, and the proton beam excites the fluorescence generated by the fluorescence target plate to acquire images through the reflector and the camera, so that the proton beam cross section information can be obtained very intuitively. The method can measure the proton beam intensity and the cross section of the beam flow line of the proton cyclotron in a limited space, and the applicable proton beam energy is 70MeV to 250 MeV;

the shielding cover is arranged outside the beam current blocking body in a surrounding mode, only a proton beam current path is reserved, good electromagnetic shielding is provided for a weak current signal, the proton beam current impacts the beam current blocking body to generate the weak current signal, and the weak current signal is amplified by the weak current signal amplifying circuit and then is subjected to data acquisition system to obtain the intensity information of the proton beam current;

the reflector is a plane mirror or a triple prism, the fluorescence generated by the fluorescence target sheet is reflected by the two plane mirrors or the triple prisms and transmitted to the lens of the camera so as to obtain the cross section information of the proton beam, and meanwhile, the camera is far away from a radiation field, so that the service life of the camera is prolonged;

the invention greatly saves the longitudinal space of the beam pipeline and has very important function for relieving the problem of tension of the beam line longitudinal space of the proton treatment system; if the system is powered off and the pneumatic system fails, the beam current blocking body can fall down by means of gravity, and safety is guaranteed.

The inner cavity of the vacuum chamber is in a vacuum state, the inner cavity of the telescopic corrugated pipe is communicated with the inner cavity of the vacuum chamber and is in a vacuum state, two ends of the telescopic corrugated pipe are respectively in sealing connection with the through hole and the sealing disc, and the beam current blocking body and the fluorescent target sheet can be driven to move up and down by extending or contracting the piston rod of the air cylinder, so that the vacuum requirement in the vacuum chamber is met.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic block diagram of the measurement of proton beam current intensity according to the present invention.

Reference numerals: 1. a vacuum chamber; 2. a beam line; 3. a cylinder; 4. a piston rod; 5. a beam current blocking body; 6. a fluorescent target; 7. a reflector; 8. a camera; 9. a shield case; 10. an observation window; 11. a proton beam cross section; 12. a bellows; 13. a connecting rod; 14. a through hole; 15. fixing a bracket; 16. a sealing disk.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in figure 1, the invention discloses a proton beam intensity and cross section measuring device, which comprises a vacuum chamber 1 and a beam pipeline 2, wherein the cross section of the vacuum chamber 1 is rectangular, the cross section of the beam pipeline 2 is arc-shaped, the lower part of the vacuum chamber 1 is communicated with the upper part of the beam pipeline 2, an air cylinder 3 is arranged above the vacuum chamber 1, a piston rod 4 of the air cylinder 3 is vertically downward, the lower end of the piston rod 4 is fixedly connected with a beam blocking body 5 and a fluorescent target sheet 6 which are positioned in an inner cavity of the vacuum chamber 1 or the beam pipeline 2, the piston rod 4 of the cylinder 3 can respectively drive the beam blocking body 5 and the fluorescent target sheet 6 to move to the position of a proton beam flow section 11 in the beam pipeline 2, the beam blocking body 5 blocks a proton beam to generate a weak current signal, a reflector 7 and a camera 8 are arranged on the outer side of the beam pipeline 2, and fluorescence generated by exciting the fluorescent target sheet 6 by the proton beam is reflected by the reflector 7 and transmitted to a lens of the camera 8; the upper end of the vacuum chamber 1 is provided with a fixed support 15, the cylinder body of the air cylinder 3 is fixedly arranged on the fixed support 15, the upper end of the vacuum chamber 1 is provided with a through hole 14, the outside of the through hole 14 is hermetically connected with a telescopic corrugated pipe 12, the other end of the telescopic corrugated pipe 12 is hermetically connected with a sealing disc 16, the lower end of a piston rod 4 of the air cylinder 3 is fixedly connected with the upper part of the sealing disc 16, the lower part of the sealing disc 16 is fixedly connected with a connecting rod 13, and the beam current blocking body 5 and the fluorescence target; the cylinder 3 is a two-stage telescopic cylinder, a first-stage piston rod 4 of the cylinder 3 extends out and drives the fluorescent target 6 to move to the position of the proton beam section 11, and a second-stage piston rod 4 of the cylinder 3 extends out and drives the beam stopper 5 to move to the position of the proton beam section 11.

The surface of the fluorescence target sheet 6 is coated with a fluorescence material, the fluorescence target sheet 6 is made of quartz glass, the side wall of the vacuum chamber 1 or the beam pipeline 2 is provided with an observation window 10, the proton beam excites the fluorescence target sheet 6 to generate fluorescence, the fluorescence passes through the observation window 10 and is transmitted to the reflector 7, the reflectors 7 are two, the reflector 7 is a plane mirror or a triple prism, and the fluorescence is reflected and transmitted to the lens of the camera 8 through the two correspondingly arranged plane mirrors or triple prisms.

As shown in fig. 2, a shielding case 9 is disposed around the beam stopper 5, the beam stopper 5 is made of tungsten or molybdenum, the shielding case 9 is made of an electromagnetic shielding material, and a weak current signal generated by the beam stopper 5 is input to the data acquisition system through a weak current signal amplification circuit.

When the present embodiment is used, the operation,

the proton beam intensity and section measuring device is used for transmitting the proton beam led out by the proton cyclotron to the beam line of a treatment terminal, and the applicable proton beam energy range is 70MeV to 250 MeV.

When the proton beam section 11 on the beam line is measured, the first-stage piston rod of the second-stage telescopic cylinder is started to extend to the full stroke, the fluorescent target sheet 6 is driven to move to the position of the proton beam section 11 in the beam pipeline 2, the proton beam section 11 is completely covered, the proton beam excites the fluorescence generated by the fluorescent target sheet 6, the obtained fluorescence image is transmitted to the lens of the camera 8 through the reflector, and then the information of the proton beam section 11 is obtained.

When the proton beam intensity on the beam line is measured, a second-stage piston rod of a second-stage telescopic cylinder is started to extend to the full stroke, and the shielding cover 9 and the beam blocking body 5 are driven to move to the position of a proton beam section 11 in the beam pipeline 2. The proton beam section 11 is completely blocked by the beam blocking body 5, the beam blocking body 5 generates a weak current signal, and the current carried by the proton beam is measured by the weak current signal amplifying circuit so as to obtain the intensity information of the proton beam.

When the beam current blocking body 5 and the fluorescence target sheet 6 do not work, the first-stage piston rod and the second-stage piston rod of the secondary telescopic cylinder are contracted to drive the secondary telescopic cylinder to be completely separated from a proton beam current path; the working positions of the beam blocking body 5 and the fluorescence target sheet 6 are switched by different working positions of the air cylinder 3.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.