JPH05188151A - Apparatus for detecting emission of radiation - Google Patents

Abstract

PURPOSE:To obtain an apparatus for detecting emission of radiation, which has no measuring error caused by the heat input through a slit and has no measuring errors caused by heat input from a detector container and nuclear heating of the detector itself due to neutrons. CONSTITUTION:A detector container 2 has an opening part, which can receive nuclear fusion plasma 1 into its inside, and has the double-container structure wherein the wall comprises an inner container 2b and an outer container 2c. Cooling water can be circulated in the space in the wall. A slit 3 is arranged in the container 2 and secures the minimum required field of view for the plasma 1. A detecting base 4 is provided at the bottom surface side in the container 2. A detector array 5 is arranged along the plate surface of the detector base 4 and detects the radiation from the plasma 1. Pipes 8-10 are arranged around the slit 3 and the detector base 4 so that the cooling water in the wall of the container 2 is circulated. A cooling device 11 circulates the cooling water in the pipes 8-10 and the container 2 for cooling so as to make the temperature constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation radiation detector for detecting radiation radiation distribution in a nuclear fusion reactor, for example.

[0002]

2. Description of the Related Art Conventionally, in a nuclear fusion reactor, as shown in FIG. 4, radiation from a fusion plasma 41 is stored in a detector container 43 as a radiation radiation detector for measuring the radiation distribution of radiation. It is guided to a detector array 44 via a slit 42 provided therein, where the spatial distribution of radiation radiation is detected, and the detected value is input to a data processing computer 47 via a signal amplifier 45 and an interface 46. It has become.

This conventional radiation radiation detector is for a nuclear fusion reactor for a test, and its operating time is as short as 10 seconds, and the detector for neutrons and γ rays by the fusion reaction and the surrounding structures. The increase in temperature was not so large because the heat input was smaller than the heat capacity, and it did not cause an error in the measurement.

[0004]

The operating time of an actual fusion reactor is 10 seconds to 1000 seconds at present, or is a steady operation, and a large amount of neutrons and γ rays are generated. The temperature of the slit 42, the detector container 43, and the support fitting in FIG. 4 rises due to nuclear heat generation. Further, the radiation from the fusion plasma 41 and the incidence of particles also cause a temperature difference between the slit 42, the detector array 44, the detector container 43, and the detector array 44 at the device entrance portion.
Due to this temperature difference, the detector array 44 has a radiation input, and becomes a heat input from other than the direct radiation of the fusion plasma 1, resulting in a measurement error. Particularly, when a large amount of neutrons and γ rays are generated, the temperature of the detector array 44 rises due to nuclear heat generation, which causes a measurement error.

The present invention provides a radiation radiation detector which eliminates the heat input from the slit, eliminates the measurement error, and eliminates the heat input from the detector container and the measurement error due to nuclear heat of the detector itself due to neutrons. To aim.

[0006]

In order to achieve the above object, the present invention is configured as follows. That is, the invention corresponding to claim 1 is a double container structure having an opening capable of taking in plasma from a nuclear fusion device inside and having a wall composed of an inner container and an outer container. A detector container in which cooling water can flow in the space, a slit provided in the detector container for ensuring the minimum necessary field of view of the plasma, and a bottom face side in the detector container A detector base, a detector array arranged along the plate surface of the detector base for detecting radiation from the plasma, and cooling water in the detector container wall,
A cooling water passage circulated around the slit and the detector base; and a cooling device for circulating and cooling the cooling water in the cooling water passage and the detector container to keep the temperature constant. It is equipped with.

The invention corresponding to claim 2 is a double structure having an opening capable of taking in plasma from a nuclear fusion device therein and having a wall composed of an inner container and an outer container,
A detector container in which cooling water can flow in the inner space of the wall, a slit arranged in the detector container for ensuring a minimum necessary field of view of the plasma, and a bottom surface side in the detector container And a detector array arranged along the plate surface of the detector base for detecting the radiation from the plasma, and a detector array arranged in the detector container and required for the plasma. A slit for ensuring a minimum field of view, a monitor detector installed on the detector base for detecting radiant radiation due to a temperature difference between the detector array and the slit, and a detector container wall To circulate cooling water around the slit and the detector base so as to circulate, and to circulate and cool the cooling water in the cooling water passage and in the detector container to keep the temperature constant. With cooling system It is provided.

[0008]

According to the invention of claim 1, since the slit and the detector array are cooled by cooling water having a constant temperature, the heat input from the slit is eliminated and the measurement error is eliminated. In addition, since cooling water is circulated in the detector container wall, the detector container is cooled and serves as a shield for neutrons, so heat input from the detector container and measurement of the detector itself by neutrons There is no error.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first embodiment of a radiation radiation detecting apparatus according to the present invention, which has a detector container 2 capable of taking in plasma 1 from a nuclear fusion apparatus. The wall of the detector container 2 has a double container structure including an outer container 2b and an inner container (vacuum container) 2c, and has an opening 2a.
The cooling water can flow through the inner space of the wall. Both the outer container 2b and the inner container 2c are made of a material having good thermal conductivity, for example, copper or aluminum. In the detector container 2, on the side of the opening 2a,
A slit 3 is provided to secure the minimum required field of view of the plasma 1. A curved detector base 4 made of a material having high heat conductivity such as copper or aluminum is disposed on the bottom surface side in the detector container 2. Detector base 4
A plurality of detector arrays 5 for detecting the radiation from the plasma 1 are arranged along the plate surface of the. Detector array 5
Is the detector cover 6 to avoid radiation input from the surroundings.
The detector cover 6 is housed inside and has a front side opening, and is formed in a box shape from a material having good heat conductivity such as copper or aluminum. A detector slit 7 is provided in the opening of the detector cover 6 in order to secure a minimum visual field required for the detector cover 6 (to avoid radiation input from other portions).

A slit cooling pipe 8 is arranged on the outer peripheral edge of the slit 3, and a detector base cooling pipe 9 is arranged on the outer peripheral edge of the detector base 4, and further, the detector base cooling pipe is arranged. The pipe 9 for cooling, the pipe 8 for cooling the slit, and the detector container 2 are connected by the cooling pipe 10 for communication, and the cooling water can be circulated. A cooling device 11 for cooling the cooling water is provided in a part of the communication cooling pipe 10.

The detection signal detected by the detector array 5 is input to the data processing computer 12 via the signal amplifier 13 and the interface 14, where the radiation distribution is processed. Data processing computer 1
2 outputs a temperature control command and a flow rate control command to the cooling device 11 so that the temperature of the cooling water from the cooling device 11, which will be described later, becomes constant at each place. That is, the temperature of the slit 3 is detected by the temperature detector 15, the temperature of the detector container 2 is detected by the temperature detector 16, and the temperature of the detector base 4 is detected by the temperature detector 17. ing. The detection signals from the temperature detectors 15, 16 and 17 are respectively input to the temperature controller 18, where the deviation from the temperature set value is obtained, and this deviation is input to the data processing computer 12 via the interface 14. A predetermined calculation is performed here, and a temperature control command and a flow rate control command are output.

2 (a) and 2 (b) are a front sectional view and a plan sectional view, respectively, showing the internal structure of the detector container 2 of FIG. 1, in order to make the temperature of the detector container 2 uniform, and ,
In order to form the flow path in a zigzag manner, a plurality of partition plates 2d are arranged in the inner space of the wall between the outer container 2b and the inner container 2c so as to be spaced from each other. The material of the partition plate 2d is copper or aluminum in order to improve the heat conduction in the vertical direction of FIG. 2 (a), and is made of copper or aluminum in the circumferential direction in order to make the temperature uniform in the lateral direction. It has a structure in which a material having good thermal conductivity is wound into a belt shape. In order to keep the temperature of this portion constant, the detector array 5 and the slit 3 are similarly configured to control the temperature and flow rate of the cooling water. In the figure, 2e is a cooling water inlet and 2f is a cooling water outlet.

According to the embodiment described above, the cooling device 11
The cooling water whose temperature is constantly cooled by the detector container 2
Since the cooling pipes 8 and 9 are circulated in the wall space and inside, respectively, the temperatures of the slit 3 and the detector array 5 are constant, so that the heat input from the slit 3 is eliminated and the measurement error is eliminated. In this embodiment, the detector array 5 is fixed to the detector base 4 by a material having a good thermal conductivity, and both the detector array 5 and the detector base 4 are made of a material having a good thermal conductivity. Since it is covered in the detector cover 6, radiation input from the periphery of the detector array 5 can be avoided, and the temperatures of the detector array 5 and the detector cover 6 can be made the same. Further, since the detector slit 7 is provided in the front opening of the detector cover 6, unnecessary radiation input to the detector can be avoided.

Further, as the detector container 2 is cooled,
Since it functions as a neutron shield, there is no heat input from the detector container 2 and there is no measurement error. Furthermore, since the cooling of the detector container 2 and the neutron shielding are performed at the same time, there is no measurement error due to heat input from the detector container 2 and nuclear heat generation of the detector array 5 itself due to neutrons. In addition, it is possible to automate the removal of the shield when installing and removing the device, and it is possible to reduce the exposure compared to the neutron shield method that has been used to stack polyethylene containing boron around the device. Become. Specifically, since the cooling water in the detector container 2 is transferred to another container by the water supply / drainage mechanism when the device is attached or detached, the weight of the device is remarkably reduced and the work can be performed in a short time.

FIG. 3 is a schematic view showing a second embodiment of the present invention. Not only is the detector array 4 provided on the detector base 4 of FIG. 1 but the fusion plasma cannot be directly viewed, A monitor detector 20 is provided in which the slit 3 is placed in the field of view, whereby the input of the detector array 5 due to the radiation input due to the temperature difference between the detector array 5 and the detector slit 7 is detected. The temperature controller 18 and the temperature detectors 15, 16 and 17 shown in FIG. 1 are not provided, and the other points are the same as those in the above-described embodiment. In this case, by controlling the flow rate of the cooling water in the slit 3 so that the output of the monitor detector 20 becomes zero, it is possible to eliminate the measurement error caused by the heat input due to the temperature difference.

The detection output of the monitor detector 20 of the embodiment shown in FIG. 3 is read into the data processing computer 12, and the output from another detector array 5 is subtracted and corrected. When this method is effective, the output of the detector array 5 is relatively small and the reduction of the dynamic range of the signal amplifier 13 does not matter.

In each of the above-mentioned embodiments, both the inner container 2b and the outer container 2c of the detector container are made of a material having a good thermal conductivity. Only one of the container 2b and the outer container 2c may be made of a material having a good thermal conductivity. Further, in all the above-mentioned embodiments, the outside of the detector container 2 is the atmosphere, but in a special case, the whole apparatus may be put in a huge measurement port.

[0018]

According to the present invention, there is no heat input from the slit, there is no measurement error, and there is no measurement error due to the heat input from the detector container and the nuclear heat of the detector itself due to neutrons. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of a radiation radiation detecting apparatus according to the present invention.

FIG. 2 is a view for explaining the configuration of the detector container in FIG.

FIG. 3 is a diagram showing a schematic configuration of a second embodiment of the radiation radiation detecting device according to the present invention.

FIG. 4 is a diagram showing a schematic configuration of an example of a conventional radiation radiation detection device.

[Explanation of symbols]

1 ... Fusion plasma, 2 ... Detector container, 3 ... Slit,
4 ... Detector base, 5 ... Detector array, 8 ... Slit cooling pipe, 9 ... Detector base cooling pipe, 10 ... Communication cooling pipe, 11 ... Cooling device, 15, 16, 17 ... Temperature detector, 18 ... Temperature controller, 20 ... Monitor detector.

Claims (2)

[Claims] 1. A double container structure having an opening capable of taking in plasma from a nuclear fusion device therein, and having a wall composed of an inner container and an outer container, wherein cooling water flows through the inner space of the wall. A possible detector container, a slit provided in the detector container for ensuring a minimum required field of view of the plasma, and a detector base provided on the bottom surface side in the detector container. A detector array arranged along the plate surface of the detector base for detecting radiation from the plasma, and cooling water in the detector container wall circulated around the slit and the detector base. A radiation radiation detecting apparatus comprising: a cooling water passage provided; and a cooling device for circulatingly cooling the cooling water in the cooling water passage and in the detector container to keep the temperature constant. 2. A double structure having an opening capable of taking in plasma from a nuclear fusion device inside, and a wall having an inner container and an outer container, in which cooling water can flow in the inner space of the wall. A detector container, a slit provided in the detector container for securing a necessary minimum field of view of the plasma, and a detector base provided on the bottom surface side in the detector container, A detector array arranged along the plate surface of the detector base for detecting radiation from the plasma, and a slit arranged in the detector container for ensuring a necessary minimum field of view of the plasma. A monitor detector installed on the detector base for detecting radiant radiation due to a temperature difference between the detector array and the slit, cooling water in the detector container wall, the slit and the detector base. Around Radiation detecting device comprising: a cooling water passage circulated in the cooling water passage; and a cooling device for circulatingly cooling the cooling water in the cooling water passage and the detector container to keep the temperature constant. ..