Synchronously controllable large dynamic pulse neutron measurement system

Abstract

The present invention discloses a synchronously controllable large dynamic pulse neutron measurement system, including a target chamber for placing a target neutron source, a sample carrying assembly, which includes a vacuum isolation cylinder and a sample fixing member located in the vacuum isolation cylinder, and moves linearly under the drive of a driving mechanism to approach or move away from the target neutron source located in the target chamber, the sample fixing member has at least two carrying holes of diameter specifications and / or depth specifications, the carrying holes are used to fix the sample to be activated, a centralized control box, a gamma measurement assembly for measuring the neutron yield after the sample is activated, and a triggering synchronous controller for controlling the working time nodes of the centralized control box and the gamma spectrum recorder. The synchronous measurement control mechanism is combined with a movable vacuum isolation cylinder and a sample fixing member with carrying holes of various specifications to meet the requirements of a large range of neutron yield measurements, and the time of each step is accurately controlled, greatly improving the measurement accuracy and efficiency.

Description

Technical Field

[0001] The invention relates to the field of neutron measurement equipment, and in particular to a synchronously controllable large dynamic pulse neutron measurement system. Background Art

[0002] In fusion physics experiments, fusion neutrons are produced in a very short time. The transient neutron yield is usually given by a neutron activation measurement system. Fusion neutrons excite characteristic activated nuclides in the activated sample target material, and the activated sample target material is transported to the gamma-ray detector for characteristic gamma-ray measurement. Since the gamma-ray detector has a certain linear range, the neutron yield range measured after activation using a sample of a single size is limited, resulting in that the neutron yield in fusion physics experiments cannot usually be accurately predicted, that is, it is difficult to obtain a high measurement accuracy using a single-size sample. At the same time, the measurement accuracy of transient neutron yield in fusion physics experiments is also related to the control accuracy of the distance from the sample to the target neutron source, the synchronization accuracy of the measurement time of the activated sample, etc. Therefore, a measurement system that can take into account the above-mentioned problems is urgently needed to improve the measurement accuracy of transient neutron yield in experiments. Summary of the invention

[0003] To solve the above problems, the present invention provides a synchronously controllable large dynamic pulse neutron measurement system to quickly measure the gamma ray energy spectrum and improve the reliability and stability of the measuring instrument.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A synchronously controllable large dynamic pulse neutron measurement system, the key of which is to include:

[0006] The target chamber is a hollow structure, used to place the target neutron source;

[0007] A sample mounting assembly, comprising a vacuum isolation cylinder and a sample fixing part located in the vacuum isolation cylinder, wherein the vacuum isolation cylinder can enclose a target chamber to form a vacuum space, and can move linearly under the drive of a driving mechanism to approach or move away from a target neutron source located in the target chamber, and the sample fixing part has mounting holes of at least two diameter specifications and / or depth specifications, and the mounting holes are used to fix the sample to be activated;

[0008] A centralized control box, which is used to receive the distance signal between the front end of the vacuum isolation straight cylinder and the target neutron source, and control the operation of the driving mechanism;

[0009] A gamma measurement assembly, used to measure the neutron yield after sample activation, which includes a gamma spectrum recorder and a gamma ray detector;

[0010] The trigger synchronization controller is used to control the working time nodes of the centralized control box and the gamma spectrum recorder.

[0011] By adopting the above structure, samples of different specifications can be placed through the mounting holes with different diameter specifications and / or depth specifications on the sample fixing part, so that activation measurement of samples of various sizes can be realized in a fusion experiment. The activation of samples of various sizes can avoid the problem that the gamma-ray detector cannot accurately measure due to the low or high sample activity after activation of a single sample, that is, it is suitable for the range of various yields of fusion physics experiments, and improves the dynamic range of accurate measurement of transient neutron yield. At the same time, the synchronous controller controls related equipment by pulse signals, which can well control the time nodes of each step of the fusion experiment, avoid errors in transient neutron yield measurement caused by time asynchronization, and greatly improve measurement accuracy.

[0012] Preferably, the sample carrying assembly further comprises a bellows telescopic tube sleeved on the outside of the vacuum isolation cylinder, the bellows telescopic tube having a front connection end and a rear connection end, wherein the rear connection end is fixedly connected to the rear end of the vacuum isolation cylinder, the front connection end is sleeved with a right mounting flange, and the target chamber has a left mounting flange matching the right mounting flange. With the above structure, the connection position between the vacuum isolation cylinder and the target chamber can be better sealed by the bellows telescopic tube, the vacuum degree of the irradiation environment can be ensured, and the experimental measurement accuracy can be improved.

[0013] Preferably, the driving mechanism includes a screw and a servo motor, the front end of the screw is rotatably supported on the right mounting flange, the rear end is connected to the rear connecting end by threaded fitting, the servo motor is used to drive the screw to rotate, the front end of the vacuum isolation straight tube is provided with a laser ranging probe, the laser ranging probe is connected to the centralized control box via a composite feedback cable, and the servo motor is connected to the centralized control box via a drive control cable. With the above scheme, the laser ranging probe can accurately monitor the distance between the front end of the vacuum isolation straight tube and the target neutron source, and then through its feedback signal, the centralized controller can issue instructions to the servo motor in time, so as to more accurately control the position of the vacuum isolation tube and improve the measurement accuracy. At the same time, the driving mechanism of the screw and the servo motor is used to improve the stability of the movement of the vacuum isolation tube, that is, to ensure the stability of the sample movement.

[0014] Preferably, the rear end of the sample fixture has a centralizing tube extending backward along its length, and the composite feedback cable passes through the centralizing tube. The above solution prevents the composite feedback cable from dragging and affecting the position of the sample fixture.

[0015] Preferably, the sample fixing part includes at least two fixing seats in a disc-shaped structure, the fixing seats are distributed along the axial direction of the vacuum isolation straight cylinder, and there is a thickness difference between each fixing seat, each fixing seat is provided with at least two mounting holes, each mounting hole on the same fixing seat has a diameter difference, and the mounting holes facing each fixing seat have the same diameter. Fixing seats of different thicknesses are used, and mounting holes of different diameters are provided on each fixing seat to meet the placement of samples of various specifications.

[0016] Preferably, a time delay controller is provided between the trigger synchronization controller and the gamma spectrum recorder, the trigger synchronization controller is connected to the time delay controller via a trigger signal cable B, the time delay controller is connected to the gamma spectrum recorder via a delay control line, and the trigger synchronization controller is connected to a centralized control box via a trigger signal cable A. With the above scheme, the time delay controller can better realize the synchronous control of the time nodes, that is, better control the interval between the irradiation and the measurement time, which is conducive to further improving the measurement accuracy of the neutron yield.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The synchronously controllable large dynamic pulse neutron measurement system provided by the present invention uses a synchronous measurement control mechanism in conjunction with a movable vacuum isolation straight cylinder and a sample fixture with mounting holes of various specifications to meet the needs of a wide range of neutron yield measurements, and accurately control the time of each step, thereby greatly improving measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure and principle of the present invention;

[0020] Figure 2 This is a schematic diagram of the sample carrying assembly structure;

[0021] Figure 3 for Figure 2 A cross-sectional view of

[0022] Figure 4 Schematic diagram of the sample fixing structure. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with embodiments and drawings.

[0024] refer to Figure 1 and Figure 4The synchronously controllable large dynamic pulse neutron measurement system shown mainly includes a target chamber 23, a sample carrying assembly, a centralized control box 9, a gamma measurement assembly and a trigger synchronization controller 10, wherein the target chamber 23 is generally a hollow spherical structure, mainly used to place the target neutron source 1, and one side of the target chamber has a left mounting flange 24 connected to its interior.

[0025] In this embodiment, the sample carrying assembly mainly includes a bellows 6, a vacuum isolation cylinder 7, and a sample fixing part 4 located in the vacuum isolation cylinder 7. As shown in the figure, the front end of the vacuum isolation cylinder 7 is closed and the rear end is open. The bellows 6 is sleeved on the outside of the vacuum isolation cylinder 7. The bellows 6 has two rigid connecting ends, namely a front connecting end 60 and a rear connecting end 61. The rear connecting end 61 is fixedly connected to the rear end of the vacuum isolation cylinder 7, and the connecting position ensures sealing, that is, there is no gap between the rear connecting end and the vacuum isolation cylinder 7, and the front connecting end 60 is fixedly sleeved with a right mounting flange 8 matching the left mounting flange 24.

[0026] The front end of the bellows 6 is open. When the target chamber 23 is fixedly connected to the right mounting flange 8 through the left mounting flange 24, the vacuum isolation straight cylinder 7 can freely pass through the front end open part of the bellows 6 and extend into the target chamber 23. In order to accurately control the position of the vacuum isolation straight cylinder 7, the sample carrying assembly also includes a driving mechanism 3. As shown in the figure, the driving mechanism 3 mainly includes a screw 30 and a servo motor 31. The front end of the screw 30 is rotatably supported on the right mounting flange 8. The rear connecting end 61 has an outwardly protruding ear 610 at a position corresponding to the screw 30. The ear 610 has a screw hole that is threadedly matched with the screw 30. The servo motor 31 is used to drive the screw 30 to rotate. When the servo motor 31 works to drive the screw 30 to rotate, because the ear 610 is threadedly matched with the screw 30, the bellows 6 contracts. At the same time, the rear end of the bellows 6 synchronously drives the vacuum isolation straight cylinder 7 to move forward, so that it is close to or away from the target neutron source 1 in the target chamber 23.

[0027] The inner wall of the bellows 6 is in close contact with the outer wall of the vacuum isolation cylinder 7. When the left mounting flange 24 is fixedly connected to the right mounting flange 8, the front connecting end 60 also at least partially extends into the target chamber 23. In addition, the front end of the vacuum isolation cylinder 7 is closed, which can fully ensure the vacuum degree inside the target chamber 23 during the fusion experiment and reduce environmental interference factors. Of course, in the case of a certain bellows 6, when a vacuum environment is to be formed only through the vacuum isolation cylinder 7 and the target chamber 23, it is necessary to add a sliding sealing structure between the two to ensure that the movement of the vacuum isolation cylinder 7 will not affect the vacuum degree of the target chamber 23.

[0028] The size of the sample fixture 4 is basically adapted to the inner diameter of the vacuum isolation cylinder 7. The sample fixture 4 is placed into the vacuum isolation cylinder 7 from the rear end. When the vacuum isolation cylinder 7 is in a horizontal state, the sample fixture 4 can basically maintain its position in the vacuum isolation cylinder 7, that is, when the vacuum isolation cylinder 7 moves, there will be no relative sliding between the sample fixtures 4. The sample fixture 4 is usually placed at the front end of the vacuum isolation cylinder 7 to contact the inner wall of the front end, which is conducive to better measuring the position.

[0029] The front end of the vacuum isolation straight cylinder 7 is detachably provided with a laser ranging probe 2, which is connected to the centralized control box 9 via a composite feedback cable 19. The composite feedback cable 19 passes through the rear end of the vacuum isolation straight cylinder 7. At the same time, the centralized control box 9 is connected to the servo motor 31 via a drive control cable 18. The laser ranging probe 2 can monitor the distance between the sample on the sample fixture 4 and the target neutron source 1 in real time, and timely feedback to the centralized control box 9 via the composite feedback cable 19. The centralized control box 9 can timely control the working state of the servo motor 31 via the drive control cable 18 to adjust the position of the vacuum isolation straight cylinder 7 to meet the set value.

[0030] In the present application, the sample fixing part 4 has at least two mounting holes 40 of diameter specifications and / or depth specifications, and the mounting holes 40 are used to fix the sample to be activated, that is, the fixing part 4 has at least two mounting holes 40 of different depths, or at least two mounting holes 40 of different diameters. Of course, there can also be at least two mounting holes 40 of unequal diameters and depths.

[0031] For its specific structure, please refer to Figure 4 The embodiment shown includes at least two fixed seats 41 with a disc-shaped structure and a base 43. As shown in the figure, the two fixed seats 41 and the base 43 are arranged opposite to each other, the fixed seat 41 is located in the front, and the thickness of the frontmost fixed seat 41 is smaller than the thickness of the rear fixed seat 41. The thickness of the base 43 is unlimited. The three are fixed as a whole by symmetrically arranged connecting rods 44 to ensure that the positions of the three are fixed and there is no relative displacement between them.

[0032] Four mounting holes 40 with different diameters are arranged on each fixing seat 41. The large mounting holes 40 on the front and rear fixing seats 41 are arranged opposite to each other, and the diameters of the opposite mounting holes 40 are equal. The depth of the mounting hole 40 is the thickness of the fixing seat 41 on which it is located. In this way, the depth of the mounting hole 40 on the rear fixing seat 41 is greater than the depth on the front fixing seat 41. This ensures that the sample fixing member 4 meets the mounting requirements of samples of various sizes and can realize activation measurement of samples of various sizes in a fusion experiment. Thin samples are placed on the front fixing seat 41 to reduce neutron attenuation and are suitable for high neutron yield measurement. Thick samples are placed at the back to increase sample activity and are suitable for low neutron yield range measurement. Activation of samples of various sizes can avoid the problem that the gamma-ray detector cannot accurately measure due to too low or too high sample activity after activation of a single sample. It is suitable for various yield ranges of fusion physics experiments and improves the dynamic range of accurate measurement of transient neutron yield.

[0033] The middle part of the base 43 is provided with a straightening tube 42 extending backward along its axial direction. Through the straightening tube 42, the sample fixture 4 can be better loaded into the vacuum isolation straight cylinder 7 as a whole, or taken out from the vacuum isolation straight cylinder 7. In addition, in this embodiment, the straightening tube 42 is a hollow structure, and the base 43 is provided with a through hole A430 that penetrates the straightening tube 42, and the two fixing seats 41 are provided with through holes B410 arranged opposite to each other. In this way, the composite feedback cable 19 can pass through the two through holes B410 and the through hole A430 in turn, and then pass out from the rear end of the straightening tube 42, and then pass out from the rear end of the vacuum isolation straight cylinder 7 to be connected to the centralized control box 9. This can effectively prevent the cable from naturally falling on the bottom wall of the vacuum isolation straight cylinder 7 and affecting the position of the sample fixture 4, which is conducive to further reducing experimental errors.

[0034] In the present application, the gamma measurement component is mainly used to measure the neutron yield after sample activation, and it mainly includes a gamma spectrum recorder 14, a multi-channel spectrometer 13 and a gamma ray detector 12. As shown in the figure, the gamma spectrum recorder 14 is connected to the multi-channel spectrometer 13 through a signal output cable 21, and the multi-channel spectrometer 13 is connected to the gamma ray detector 12 through a high-voltage transmission line 20.

[0035] The trigger synchronization controller 10 is mainly used to control the working time nodes of the centralized control box 9 and the gamma spectrum recorder 14, that is, to accurately control the experimental irradiation time and the measurement time through the set interval time, such as Figure 1As shown, usually after the sample irradiation is completed, the activated sample will be transferred to the gamma ray detector 12, and detection will be carried out after a period of time. Therefore, in this embodiment, a delay controller 11 is arranged between the trigger synchronization controller 10 and the gamma spectrum recorder 14. The trigger synchronization controller 10 is connected to the time delay controller 11 through a trigger signal cable B17, the time delay controller 11 is connected to the gamma spectrum recorder 14 through a delay control line 22, and the trigger synchronization controller 10 is connected to the centralized control box 9 through a trigger signal cable A16.

[0036] refer to Figure 1 and Figure 4 The working process of the synchronously controllable large dynamic pulse neutron measurement system shown is as follows: the trigger synchronization controller 10 is connected to the trigger signal synchronization transmission cable 15, and a pulse signal can be sent to the trigger synchronization controller 10 through the trigger signal synchronization transmission cable 15.

[0037] Before the fusion experiment, first fix the right mounting flange 8 to the left mounting flange 24 to ensure that the target neutron source 1 placed in the chamber 23 is in a vacuum environment, then place the sample to be activated on the sample fixture 4, and place the sample fixture 4 in the vacuum isolation straight cylinder 7, and make sure all cables are connected correctly.

[0038] Then, the first pulse signal is sent to the trigger synchronization controller 10 through the trigger signal synchronization transmission cable 15, and the trigger synchronization controller 10 synchronously sends a pulse signal to the centralized control box 9, and the centralized control box 9 sends a motion instruction to the servo motor 31, and the servo motor 31 drives the corrugated telescopic tube 6 and the vacuum isolation straight cylinder 7 to move forward synchronously through the screw rod 30.

[0039] The laser ranging probe 2 at the front end of the vacuum isolation straight tube 7 monitors the distance from the sample to the target neutron source 1 in real time during the movement, and promptly feeds back to the centralized control box 9 through the composite feedback cable 19. When the preset distance value is reached, the centralized control box 9 sends a drive signal of a stop command, and stops the servo motor 31 through the drive control cable 18, so that the vacuum isolation straight tube 7 and the corrugated telescopic tube 6 carrying a variety of samples stop moving, thereby realizing real-time and accurate automatic control of the sample distance.

[0040] After the fusion experiment, that is, after the neutron irradiation is completed, the second pulse signal is sent to the trigger synchronization controller 10 through the trigger signal synchronization transmission cable 15, and at the same time, the two trigger synchronization signals are converted and transmitted to the centralized control box 9 and the time delay controller 11 through the trigger signal cable A16 and the trigger signal cable B17 respectively. After receiving the synchronization signal instruction, the centralized control box 9 provides a driving signal of a motion instruction through the drive control cable 18, and the servo motor 31 starts to work to make the corrugated telescopic tube 6 carrying a variety of samples move to the right away from the target neutron source. When the laser ranging probe 2 senses that it has reached the initial position, it feeds back a signal status prompt of reaching the initial position to the centralized control box 9 through the composite feedback cable 19, and the centralized control box 9 sends a stop instruction to control the servo motor 31 to stop moving.

[0041] The synchronous time signal sent by the trigger signal cable B17 is sent to the gamma spectrum recorder 14 via the time delay controller 11. The time delay controller 11 synchronously sends two time signals to the gamma spectrum recorder 14, one is the synchronous time signal sent by the trigger signal cable B17, that is, the neutron irradiation time of the fusion experiment, and the other is the specified time delay information set by the time delay controller 11.

[0042] The activated multiple samples are transported to the gamma ray detector 12, and the gamma spectrum recorder 14 starts working after receiving the time delay specified by the time delay controller 11 to measure the gamma ray spectrum;

[0043] After a period of gamma ray measurement, the trigger synchronization controller 10 receives the third pulse signal through the trigger signal synchronization transmission cable 15, and sends a stop command to the gamma spectrum recorder 14 through the time delay controller 11. The gamma ray detector 12 stops working and performs activation correlation time calculation and gamma spectrum data processing.

[0044] This system has the following main features:

[0045] 1) A trigger synchronization controller 10 is used to simultaneously control the movement of multiple samples and the time synchronization of the measurement after sample activation. The synchronous trigger mode is used to record the initial moment of transient neutron activation, so that the activated samples can be accurately measured and recorded according to the preset time, and then the relevant time of the activation measurement can be accurately calculated to avoid the problem of low accuracy of transient neutron yield measurement caused by asynchronous measurement time.

[0046] 2) The system adopts a three-pulse working mode. In the preparation stage before the experiment, the synchronous controller is triggered to receive the first pulse, and the bellows 6 moves to the specified position in the direction close to the target neutron source through the servo motor 31; during the experiment, the second synchronous trigger pulse is received, and the bellows 6 moves to the initial position away from the target neutron source through the servo motor 31, and the gamma-ray detector starts to work after a time delay; after the gamma energy spectrum of the activated sample is measured for a specified time, the synchronous controller 10 is triggered to receive the third stop pulse, and the gamma-ray detector 12 stops working and automatically calculates the activation-related time, and performs data processing, which can better control each time node and ensure measurement accuracy.

[0047] 3) The sample fixture 4 for carrying samples of various sizes can realize the activation measurement of samples of various sizes in one fusion experiment. The activation of samples of various sizes can avoid the problem that the gamma-ray detector cannot accurately measure due to the low or high activity of the sample after activation of a single sample. It is suitable for various yield ranges of fusion physics experiments and improves the dynamic range of accurate measurement of transient neutron yield.

[0048] 4) The servo motor 31 is used to drive the movement of the bellows 6. The bellows 6 is matched with the structure of the vacuum isolation straight tube 7. The bellows 6 and the vacuum isolation straight tube 7 and the right mounting flange 8 and the left mounting flange 24 can form a vacuum sealing structure to ensure the vacuum degree of the space where the target neutron source 1 is measured; the sample fixture 4 for installing samples of various sizes is installed inside the vacuum isolation straight tube 7 in the atmospheric environment, and the telescopic movement of the bellows 6 is controlled by the movement of the servo motor 31 to achieve adjustable distance from the sample to the target neutron source 1.

[0049] 5) The front end of the system is equipped with a laser ranging probe 2 to monitor the distance from the sample to the target neutron source 1 in real time, and timely feed back to the centralized control box 9 through the composite feedback cable 19, so as to realize real-time and accurate automatic control of the sample distance, and further improve the experimental efficiency and detection accuracy.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A synchronously controllable large dynamic pulse neutron measurement system, characterized in that: include: A target chamber (23) having a hollow structure, used for accommodating a target neutron source (1); A sample mounting assembly comprises a vacuum isolation cylinder (7) and a sample fixing part (4) located in the vacuum isolation cylinder (7); the vacuum isolation cylinder (7) can enclose a target chamber (23) to form a vacuum space, and can move linearly under the drive of a driving mechanism (3) to approach or move away from a target neutron source (1) located in the target chamber (23); the sample fixing part (4) has mounting holes (40) of at least two diameter specifications and / or depth specifications, and the mounting holes (40) are used to fix samples to be activated; A centralized control box (9) is used to receive a distance signal between the front end of the vacuum isolation cylinder (7) and the target neutron source (1), and control the operation of the driving mechanism (3); A gamma measurement assembly, used for measuring the neutron yield after sample activation, comprising a gamma spectrum recorder (14) and a gamma ray detector (12); Triggering a synchronous controller (10) to control the working time nodes of the centralized control box (9) and the gamma spectrum recorder (14); The sample carrying assembly also includes a bellows expansion tube (6) sleeved on the outside of the vacuum isolation straight cylinder (7), the bellows expansion tube (6) having a front connecting end (60) and a rear connecting end (61), wherein the rear connecting end (61) is fixedly connected to the rear end of the vacuum isolation straight cylinder (7), the front connecting end (60) is fixedly sleeved with a right mounting flange (8), and the target chamber (23) has a left mounting flange (24) matching the right mounting flange (8); The sample fixing member (4) comprises at least two fixing seats (41) in a disc-shaped structure. The fixing seats (41) are distributed along the axial direction of the vacuum isolation straight cylinder (7). There is a thickness difference between each fixing seat (41). Each fixing seat (41) is provided with at least two carrying holes (40). There is a diameter difference between each carrying hole (40) on the same fixing seat (41). The diameters of the carrying holes (40) facing each other between the fixing seats (41) are equal.

2. The synchronously controllable large dynamic pulse neutron measurement system according to claim 1, characterized in that: The driving mechanism (3) comprises a screw rod (30) and a servo motor (31); the front end of the screw rod (30) is rotatably supported on the right mounting flange (8), and the rear end is connected to the rear connecting end (61) in a threaded manner; the servo motor (31) is used to drive the screw rod (30) to rotate; a laser distance measuring probe (2) is provided at the front end of the vacuum isolation straight cylinder (7); the laser distance measuring probe (2) is connected to the centralized control box (9) via a composite feedback cable (19); and the servo motor (31) is connected to the centralized control box (9) via a drive control cable (18).

3. The synchronously controllable large dynamic pulse neutron measurement system according to claim 2, characterized in that: The rear end of the sample fixing member (4) is provided with a centralizing tube (42) extending backward along its length direction, and the composite feedback cable (19) passes through the centralizing tube (42).

4. The synchronously controllable large dynamic pulse neutron measurement system according to any one of claims 1 to 3, characterized in that: A time delay controller (11) is provided between the trigger synchronization controller (10) and the gamma spectrum recorder (14); the trigger synchronization controller (10) is connected to the time delay controller (11) via a trigger signal cable B (17); the time delay controller (11) is connected to the gamma spectrum recorder (14) via a delay control line (22); and the trigger synchronization controller (10) is connected to a centralized control box (9) via a trigger signal cable A (16).

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