JPS60207084A - Three-dimensional track measuring apparatus of corpuscular beam - Google Patents

Abstract

PURPOSE:To obtain the three-dimensional track information of corpuscular beam in a three-dimensional measuring space on the output surface of a streaking tube, by converting positional information to time information by an optical fiber group and a scintillator before connecting the same to the streaking tube. CONSTITUTION:A three-dimensional measuring space 100, which is formed by arranging a large number of rod shaped scintillators so as to bring both terminal surfaces to a matrix form, and a streaking tube 10 are connected to the terminal surface of each scintillator positioned at the terminal surface of the three-dimensional measuring space 100 and optical fiber groups 101, 102 having different lengths at every lines of the scintillators are connected by position/time converting connection lines 101, 102 comprising an optical fiber connection part 103 connected to output optical fibers in a lump at every line and a streaking tube connection part 104 connecting output optical fibers of the position/time converting connection lines to the photoelectric surface of the streaking tube 10 so as to cross the sweep direction of the streaking tube 10 at right angles.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a three-dimensional trajectory measuring device for particle beams, etc.

(Background of the invention) Measurement of three-dimensional tracks of particle beams, etc. is based on high-energy physics,
It is essential for providing fundamental data in fields such as unified theory, particle astronomy, radiometry, and phytophysics.

Therefore, we prepared a large number of scintillators that were optically independent from each other, optically coupled the output of each scintillator to a photomultiplier tube using a light guide, and measured all of these voltage signals simultaneously with many oscilloscopes. A device has been proposed that analyzes this output waveform using a computer and reconstructs the trajectory of the incident particle.

Such devices require many devices, including one photomultiplier tube for each scintillator, a preamplifier connected to this, and high-voltage and low-voltage power supplies to supply operating voltage to these devices. Not only is this a large-scale process, but it also requires a lot of time to set up and calibrate the entire device.

Furthermore, even if the incidence of a particle beam or the like itself can be recognized by n(ft) by some method, the trajectory cannot be easily known until the analysis is completed.

(Objective of the Invention) The object of the present invention is to measure the three-dimensional trajectory of particle beams, etc., which is suitable for displaying the trajectory of particle beams, etc. in real time, and analyzing the accurate three-dimensional trajectory from the displayed data. Regarding equipment.

(Structure of the Invention) In order to achieve the above object, the three-dimensional trajectory measuring device for particle beams, etc. according to the present invention is a three-dimensional trajectory measuring device for particle beams, etc., which is formed by arranging a large number of bar-shaped scintillators so that both end surfaces thereof are arranged in a matrix shape. a measurement intermediate, a streak tube, and a group of optical fibers connected to the end face of each scintillator located at the end face of the three-dimensional measurement intermediate and having different stiffness for each scintillator row;
A position-time converting connection line consisting of an optical fiber coupling section that connects each row of the optical fibers to an output optical fiber; and an output optical fiber of the position-time converting connection line connected to the photocathode surface of the streak tube. It consists of a streak pipe connection part that connects perpendicularly to the sweep direction of the
It is configured to obtain a three-dimensional track of a particle beam or the like in a three-dimensional measurement space on the output surface of the streak tube.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.

FIG. 1 is a block diagram showing an example of the overall configuration of a three-dimensional measuring device for particle beams, etc. according to the present invention.

FIG. 2 is a perspective view showing a scintillator included in the three-dimensional measurement intermediate and its contact vtgIS.

FIG. 3 is a perspective view for explaining a spatial region of a three-dimensional d1° spatial survey.

The three-dimensional measurement space 100 shown in FIG. 1 is formed by stacking a large number of scintillators as shown in FIG. 2 in rows and columns as shown in FIG. 3.

In this embodiment, scintillators 11, 12, 13° 14 form the first row, scintillators 21, 22, 23° 24 form the second row, and scintillators 41, 42° 43, 44 form the fourth row. .

The configuration of each scintillator and its connection with the optical fiber is approximately the same.

The scintillator 11 has a rectangular cross section as shown in FIG.

A reflective surface 11a that reflects internally emitted light over the entire outer peripheral surface.
is formed, and the interior thereof is filled with a scintillator material BaF211b that emits light upon incidence of gamma rays.

The first end face of the three-dimensional side measurement space 100 is called F, and the second end face is called B. The first end face is called 101, and the fiber group going from 17 to the fiber coupling part 103 is called 101, and the second end face is called F. From fiber coupling section 103 to fiber half 1Y
is set to 102.

The first end surface of the scintillator 11 has a light guide l' l I
- CF to the optical fiber 1l-OFF;
- Connected to OPB.

Similarly, the first scintillator mn in row m and column ri
The end face is connected to the optical fiber mn-0FF via the light guide rn n -CF, and the second end face is connected to the optical fiber mn-0FF via the light guide mn-CF.
It is connected to the optical fiber mn-0PB via the CB.

The lengths of these optical fibers are equal for those connected to the same row at each end face, and increase in length sequentially from row to row.

Optical fibers 1l-OPF to 14-OF in the first row of front surface F
Each length of F is L (m), each length of the optical fibers 2l-OPF to 24-OPF in the second row is L+ΔL (m), each length of the optical fibers 3l-OPF to 34-OFF in the third row The length is L+2ΔL(m), and the length of each of the optical fibers 41-OPF to 44-OPF in the fourth row is L+3ΔL(m).

Optical fibers 11-○PB to 14-0P in the first row of rear surface B
Each length of B is L+/(m), which is l longer than the forward optical fiber.

The lengths of the optical fibers 21-OPB to 24-OPB in the second row are L+1+ΔL (m), and the lengths of the optical fibers 21-OPB to 24-OPB in the second row are L+1+ΔL (m);
Each length of l-OPB to 34-OPB is L+p+2ΔL
(m), Each length of the optical fibers 41-OPB to 44-011B in the fourth row is L+! +3ΔL'(m).

FIG. 4 is a diagram showing an example of connection of optical fibers in the fiber coupling section 103, and shows an example of connection of the fourth column at 6.1. It is shown in detail.

First, 14-OFF and 24-OFF are connected in a Y-shape, and 34-OPB and 44-OPB are connected in a 7-shape, which are further connected in a 7-shape. 14-OPI
3 to 44-OPB are also connected in the same way, and the 14-OPF
~44-OPF, and all the optical fibers of the fourth column are connected to the output optical fiber 4-OPO.

Similarly, the optical fiber ll-0PF~4 in the front of the first row
l-OPF and rear optical fibers 1l-0PB to 4l-
All OPBs are connected to output optical fiber 1-OPO.

Similarly, all optical fibers in the second row are connected to 2-OPO, and all optical fibers in the third row are connected to 3-OPO.

FIG. 5 is a diagram showing the connection between the streak tube and the output fiber.

The streak tube 10 includes a photocathode 10a, a deflection electrode 10b, and a fluorescent surface 10C.

Said output fiber 1-OPo, 2-OPo, 3-OPo
, 4-OPO are connected at a streak tube connecting portion 104 at a constant interval in a direction perpendicular to the deflection direction of the streak tube 10 (direction perpendicular to the plane of the deflection electrode 10b).

In this way, information on the position of each scintillator in the column direction is indicated by the position of the fluorescent surface 10C of the streak tube 10 in the spatial axis direction, and information on the position between the scintillators in the row direction is expressed as ΔL/Cop. (Cop is the speed of light in the optical fiber) is connected to the streak tube as information on the time difference.

The detection unit 91 shown in FIG. 1 provides a trigger signal to the streak tube 10 in synchronization with the particle beam generation of the particle beam generation source 90, and the streak tube 10 operates in synchronization with the particle beam generation. I am made to do so.

The reading section 51 is a device that reads bright spots generated on the fluorescent surface of the streak tube 10. The read output is analyzed by a temporal analyzer 52 and a post-secondary unit, and outputted by a recorder 55 and a printer 56. The file disk 54 holds data necessary for analysis. The algorithm for this analysis will be described later.

Next, the operating principle of the apparatus of the embodiment will be explained 3'.

As shown in FIG. 6, a rectangular seat system corresponds to the three-dimensional B1 side protrusion formed by the scintillator.

As mentioned above, the information about the position of each scintillator in the column direction (X direction) is indicated by the position of the fluorescent surface 10C of the streak tube 10 in the spatial axis direction, and the information about the position of each scintillator in the row direction (X direction) The position information is ΔL/Cop(C
OP is the speed of light in the optical fiber) and is connected to the streak tube as information on the time difference.

I'm in position in two directions? It3L is connected to the streak tube as information on the time difference between the output on the front side and the output on the rear side of the same scintillator.

The length of the optical fiber connected to the B side of any scintillator is l larger than the length of the optical fiber connected to the 17 side.

Therefore, let the total length of the scintillator be zt, and the time tf for the light emission caused by the particle beam incident at a distance of 2 from the F side to reach the photocathode of the streak tube via the F side optical fiber 101, and the B side. The time t for reaching the same position on the photocathode of the streak tube via the optical fiber 102 of
The difference from b is as follows and is resolved on the fluorescent surface of the streak tube.

tb-t'f = (zt-z) /Cs +j! /C
op)-(Z/C3) = (7!/Cop) + (Z-2z)/Cs where Cop and Cs are the speeds of light in the optical fiber and in the axial direction of the scintillator, respectively.

That is, tb-3r is a function of 2.

Next, let us take as an example the case where the particle beam passes through the three-dimensional measurement center by drawing the trajectory indicated by the arrow a in FIG.
Explain the bright spots on the fluorescent surface.

When particles pass in the direction indicated by the arrow a, the scintillator 11 is caused to emit light, and the emitted light is transmitted to the streak tube by the output fiber 1-0'PO through the optical fibers 1l-OF)F and l1-OPB, respectively. Connected to the photocathode.

Subsequently, the scintillator 12 is caused to emit light, and the emitted light is transmitted through the optical fibers 12-CIPF and 12-OP', respectively.
B is connected to the photocathode of the streak tube by an output fiber 2-OPO.

Similarly, the scintillators 13 and 14 are sequentially caused to emit light and are sequentially connected to the photocathode of the streak tube through output fibers 3-OPo and 4-OPO, respectively.

FIG. 7 shows light emission from the fluorescent surface of the streak tube caused by the particle beam.

In FIG. 7, if the bright spot on the fluorescent surface due to light emitted from the front surface of the scintillator 11 is IIF, and the bright spot on the fluorescent surface due to light emitted from the rear surface is 1'IB, then these bright spots are The interval between the points indicates the incident position in the z-axis direction, corresponding to the above-mentioned tb-tr.

Assuming that a bright spot on the fluorescent surface due to light emitted from the front surface of the scintillator 12 is 12F, and a bright spot on the fluorescent surface due to light emitted from the rear surface is 12B, the time axis direction of the bright spots 11F and 12F is The length corresponds to the time t1 from when the scintillator 11 is made to emit light until when the scintillator 12 is made to emit light. Further, the distance between 12F and 12B indicates the positional information of the scintillator 12 in two directions.

Similarly, the length of the bright spots 12F and 13F in the time axis direction is determined from the time when the scintillator 12 is made to emit light.
3 corresponds to the time t2 until the light is emitted.

In this way, t, + δ2-1- δ3 represents the time from the light emission of the scintillator 11 to the light emission of the scintillator 14.

To make it easier to understand, the radiation passes through the three-dimensional δ1 side projection at exactly the same time as the particle beam a, and the scintillator 2
Suppose that 1 is made to emit light.

Assuming that a bright spot 21F appears due to light extracted from the front surface of the scintillator 21, the distance between the fluorescent surfaces between IIF and 21F corresponds to ΔL/Cop-t 4, which indicates position information in the y direction.

(Modifications) Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

Although the above embodiments are shown for measuring gamma rays, they can be similarly utilized for n1 measurements of other electron beams, positron beams, meson beams, etc.

Further, in order to facilitate understanding, an example in which a three-dimensional measurement intermediate area is formed using 4×4 scintillators has been shown, but it is possible to form a larger space by using an even larger number of scintillators.

Further, although an example has been shown in which 345 optical fibers are connected using a 7-shaped connecting means, for example, a 1-0PO may be formed of 8 optical fibers, branched, and connected to a scintillator.

(Effects of the Invention) As explained above, according to the present invention, a large number of rod-shaped scintillators are arranged so that both end surfaces are arranged in a matrix shape to form a three-dimensional measurement intermediate, and the optical fiber group and the scintillator Since the position information is converted into time information and connected to the streak tube, it is possible to obtain information on the three-dimensional trajectory of a particle beam, etc. in the side projection of the three-dimensional meter on the output surface of the streak tube. can.

Information on the velocity of the particle beam can also be easily obtained.

Spatial three-dimensional information can be measured in real time with one streak tube, the configuration of the device is extremely simple, and the entire system can be made compact.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the overall configuration of a three-dimensional measuring device for particle beams, etc. according to the present invention. FIG. 2 is a perspective view showing a scintillator included in the three-dimensional measurement intermediate and its connecting portion. FIG. 3 is a perspective view for explaining the spatial region between the three-dimensional measurement chambers. FIG. 4 is a diagram showing an example of connection between a scintillator and an optical fiber. FIG. 5 is a diagram showing the relationship between the optical fiber coupling part and the streak tube connection part. FIG. 6 is a schematic diagram showing the trajectory of a particle beam etc. passing between three-dimensional measurement chambers. FIG. 7 is an explanatory diagram showing changes in the fluorescent surface of the streak tube corresponding to the track. 10...Streak tube 51...Reading unit 52...Temporal analyzer 54...Frombie disk 55...Recorder 56...Printer 57...Host computer 90...Radiation source 91... ... Radiation detection section 100... Three-dimensional measurement room interval 11-14.21-24.31-34.41-44...
・Scintillator 101, 402...Optical fiber group 103...Fiber coupling part 104...Streak tube connection part Patent applicant Hamamatsu Photonisk Renni Company agent Patent attorney Inoro Dokuga 1 Illustration 4 Illustration 5

Claims (1)

[Scope of Claims] (A three-dimensional measurement space formed by arranging 11 rod-shaped scintillators such that one surface thereof is in a matrix shape, a leak tube, and the three-dimensional It consists of a group of optical fibers that are connected to the end surface of each scintillator located at the end surface of the measurement space and have different lengths for each scintillator row, and an optical fiber coupling section that connects the optical fiber groups in each row to an output optical fiber. A position-time conversion connection line,
A streak tube connection part connects the output optical fiber of the position-time conversion connection line to the photocathode of the streak tube in a direction perpendicular to the sweep direction of the streak tube, A three-dimensional track measuring device for a particle beam, etc., configured to obtain a three-dimensional track of a particle beam, etc. (2) The length of the optical fiber connected to one end face of each scintillator bending in the same row is longer by a certain length than the length of the optical fiber connected to the other end face. A device for measuring 4 three-dimensional trajectories of particle beams, etc., as described in Section 3.