Closed chamber system of space X-ray polarization detector

Abstract

The utility model discloses a closed chamber system of a space X-ray polarization detector, which is characterized by comprising a chamber wall and a chamber bottom, the cavity bottom is provided with a groove, a plurality of screw holes, a plurality of high-pressure joint mounting holes and a plurality of electronic feed-through mounting holes; the screw holes comprise electronics case mounting holes and sealing screw holes; the opening of the cavity wall is inserted into the groove and is hermetically connected with the cavity bottom through the sealing screw hole to form a closed cavity system; the high-pressure connector mounting hole is used for being hermetically connected with a vacuum high-pressure connector for providing high-pressure input for an X-ray detector in the sealed cavity system; the electronic feed-through mounting hole is used for hermetically connecting and reading electronic feed-through of a space X-ray signal observed in the closed cavity system; two sides of the side wall of the cavity wall are provided with transmission window mounting holes used for being hermetically connected with the transmission window, and X-rays enter and penetrate out of the closed cavity system through the transmission window; an inflation inlet is formed in one side wall of the cavity wall and used for inputting working gas into the closed cavity system. The system is easy to operate and maintain.

Description

Technical Field

[0001] This utility model belongs to the field of space application engineering and relates to a sealed chamber system for a space X-ray polarization detector, used for space X-ray polarization detection. Background Technology

[0002] The Wideband X-ray Polarimetry and Energy Spectral Polarimetry Satellite (WXPT), as a next-generation space X-ray polarization telescope, is expected to achieve simultaneous measurements of X-ray polarization and energy spectrum over a wide wavelength range of 3–500 keV, while also possessing a certain degree of autonomous orientation capability for celestial sources. WXPT will include three different types of polarization detectors, covering different energy regions. The low-energy detector will employ a Time Projection Chamber (TPC) polarimeter for polarization observations in the 3–10 keV energy range. The mid-energy detector will use a Compton polarimeter composed of a scattering rod and a cadmium zinc telluride (CZT) crystal array for observations in the 10–60 keV range. The high-energy detector will employ a scintillator detector, covering the 50–500 keV energy range. The TPC polarimeter's chamber is a closed system filled with working gas, primarily located between the drift electrode and the gas electron multiplier (GEM). Space X-rays interact with the sensitive gas via photoelectric reaction, generating photoelectrons. These photoelectrons lose energy and excite ionized electrons along their path. Ionized electrons drift towards the GEM at a constant velocity under the influence of a uniform electric field, and are eventually collected by the readout strips of the prototype to generate a signal. The electronics readout system records the position and time at which the ionized electrons reach the anode strip. Therefore, the TPC polarimeter obtains a two-dimensional image of the photoelectron track from a one-dimensional readout strip array, with the two-dimensional coordinates corresponding to the readout strip position and the time the signal arrives at the readout strip, respectively. Based on the two-dimensional image of the photoelectron track, the azimuth angle of each photoelectron emission direction can be reconstructed. By statistically fitting a large number of azimuth angles of photoelectron emission directions, the polarization direction and degree of polarization of the incident X-rays can be obtained, enabling polarization observation of space X-rays.

[0003] To ensure the normal operation of the TPC polarimeter during its on-orbit operation, its chamber must meet the following requirements:

[0004] 1. Allows space X-rays to both enter the chamber and exit from the chamber to the cascaded Compton polarimeter at the rear;

[0005] 2. The chamber provides a working gas input interface and a high-voltage input connector required by the detector. The signal generated by space X-rays inside the chamber can be led out to the readout electronics system outside the chamber.

[0006] 3. The WXPT satellite is expected to operate in orbit for two years, meaning the TPC's working pressure needs to remain within specified limits for at least two years. Currently, readily available chambers on the market cannot simultaneously meet all of these requirements. Utility Model Content

[0007] To address design requirements and limitations of existing structural components, this invention designs a sealed chamber system for a space X-ray polarization detector, the overall structure of which is as follows: Figure 1 As shown.

[0008] The technical solution of this utility model is as follows:

[0009] A sealed chamber system for a space X-ray polarization detector, characterized in that it includes a cavity wall 7 and a cavity bottom 9;

[0010] The cavity bottom 9 is provided with a groove 2, several screw holes, several high-voltage connector mounting holes and several electronic feedthrough mounting holes;

[0011] The screw holes include an electronics chassis mounting hole 1 for connecting the electronics chassis and a sealing screw hole for fixing the cavity wall 7 to the cavity bottom 9;

[0012] The opening of the cavity wall 7 matches the groove 2, and the opening of the cavity wall 7 is provided with a sealing screw hole that matches the position of the sealing screw hole on the cavity bottom 9; the opening of the cavity wall 7 is inserted into the groove 2 and sealed to the cavity bottom 9 through the sealing screw hole to form a closed cavity system;

[0013] The high-pressure connector mounting hole is used for a sealed connection of the vacuum high-pressure connector 5, which provides high-pressure input to the X-ray detector in the sealed chamber system.

[0014] The electronic feedthrough mounting hole is used for the sealed connection of the electronic feedthrough 4 for reading out the space X-ray signal observed in the sealed chamber system.

[0015] The side walls of the cavity wall 7 are provided with transmission window mounting holes for sealing and connecting the transmission window 6, so that X-rays enter the sealed cavity system through the transmission window 6 on one side, pass through the cavity, and exit the sealed cavity system through the transmission window 6 on the other side.

[0016] An air inlet 8 is provided on one side wall of the cavity wall 7 for introducing working gas into the sealed cavity system.

[0017] Furthermore, the groove is rectangular; the screw holes are evenly distributed around the outer edge of the groove; the high-voltage connector mounting holes are evenly distributed along the inner edge of one side of the groove; and the electronic feedthrough mounting holes are located at the center of the cavity bottom.

[0018] Furthermore, the mounting holes for the electronic chassis are distributed at the four apex positions of the groove.

[0019] Furthermore, the groove 2 is filled with a sealing ring.

[0020] Furthermore, the inflation port is a flange; the flange is connected to a gas valve for controlling the gas flow.

[0021] Furthermore, a tee is connected between the flange and the gas valve, and one of the tee channels is connected to a barometer for monitoring the gas pressure in the sealed chamber system.

[0022] Furthermore, one end of the flange is welded to the cavity wall 7; the transmission window is welded to the cavity wall 7.

[0023] Furthermore, a metal protective shell is installed on the outside of the transmission window 6.

[0024] Furthermore, both the cavity bottom 9 and the cavity wall 7 are made of metallic materials.

[0025] The overall structure of the sealed chamber system in this application is approximately a cuboid, such as... Figure 1 As shown, the chamber system is mainly divided into two parts: the upper part is the chamber wall, and the lower part is the chamber floor. Figure 3 As shown, the bottom of the chamber system includes screw holes, grooves, high-voltage connector mounting holes, and electronic feedthrough mounting holes. The screw holes are evenly distributed around the outer edge of the grooves, the high-voltage connector mounting holes are evenly distributed along one side of the inner edge of the grooves, and the electronic feedthrough mounting holes are located at the center of the bottom of the chamber. There are two types of screw holes: one type is for electronic enclosure mounting, located at the four corners for connecting the electronic enclosure; the remaining screw holes are for sealing and fixing the chamber wall to the bottom of the system. The high-voltage connector mounting holes are used to house the vacuum high-voltage connector, providing high-voltage input to the detectors within the chamber system. The electronic feedthrough mounting holes are used to house the electronic feedthrough for reading out the space X-ray signals observed within the chamber system. The chamber system has five sides. The bottom of the chamber wall has evenly arranged sealing screw holes, which correspond to the sealing screw holes at the bottom of the chamber. The area around the screw holes is a groove for placing the sealing ring. The sides are divided into four sides. The two shorter sides have transmission window mounting holes near the center, which ensures that X-rays from the outside space can penetrate the chamber system while maintaining the airtightness of the chamber system. One of the two longer sides is a complete plane, and the other side has a working gas input interface near the center.

[0026] Furthermore, a high-voltage connector is welded to the high-voltage connector mounting hole at the bottom of the chamber system, and an electronic feeder is welded to the electronic feeder mounting hole.

[0027] Furthermore, the cavity wall mounting holes for the transmission window are used for welding the transmission window.

[0028] Furthermore, a metal protective shell is installed on the outside of the transmission window of the chamber system to prevent the transmission window from being squeezed and deformed or damaged.

[0029] Furthermore, a flange is installed at the working gas inlet of the chamber system for gas input and for sealing the chamber after gas input.

[0030] Furthermore, the positions of the pre-drilled screw holes and grooves on the bottom and bottom surfaces of the cavity system are consistent, and the sealing ring tightly fills the grooves on the bottom and bottom surfaces of the cavity system.

[0031] Furthermore, the bottom of the chamber system is aligned with the bottom of the chamber wall, and screws are placed at the corresponding sealing holes to tightly connect the two parts, forming a complete sealed chamber system.

[0032] Furthermore, a pressure gauge is installed at the flange interface where the gas is input to the chamber system to monitor the change in the gas pressure of the chamber system over time and provide feedback on the airtightness of the chamber system.

[0033] In a preferred embodiment of this utility model, functional holes are designed mainly on the bottom and walls of the chamber, and structural components corresponding to the functional holes are installed, thereby realizing an integrated chamber system.

[0034] In a preferred embodiment of this invention, the cavity bottom and cavity wall are made of metal materials, which are sturdy and shock-resistant, and shield against external electromagnetic interference.

[0035] In a preferred embodiment of this invention, O-rings or metal gaskets are placed at the cavity wall and the cavity bottom groove of the chamber system to ensure a tight fit between the two parts.

[0036] In a preferred embodiment of this invention, the transmission window of the cavity system wall is made of beryllium metal to ensure the transmission of space X-rays.

[0037] In a preferred embodiment of this invention, the transmission window on the cavity wall of the chamber system is constructed using welding technology, which ensures both the firmness of the transmission window mounted on the cavity wall and the airtightness of the chamber system.

[0038] In a preferred embodiment of this invention, the gas inlet of the chamber system wall is connected by a flange, with one end of the flange welded to the chamber wall to ensure the stability of the flange and the airtightness of the connection.

[0039] In a preferred embodiment of this invention, the chamber system is filled with working gas by connecting a gas valve to a flange on the chamber wall, and the valve controls the gas flow.

[0040] In a preferred embodiment of this invention, after the working gas in the chamber system reaches the specified working pressure, the gas valve is closed to complete the gas seal.

[0041] In a preferred embodiment of this invention, a tee is connected between the flange of the airtight cavity wall of the chamber system and the air valve, one of which is connected to a barometer to monitor the change of air pressure in the chamber system over time.

[0042] The sealed chamber system of the space X-ray polarization detector provided by this invention has the following advantages:

[0043] First, the entire chamber system is easy to install and disassemble, and easy to operate and maintain.

[0044] Secondly, the entire chamber system is an integrated structure after installation, which makes transportation and transfer convenient and quick. Furthermore, the size of the chamber system can be flexibly adjusted according to design requirements, making it universally applicable.

[0045] Third, the cavity wall interface of the chamber system has both gas filling and pressure monitoring functions, realizing multiple uses in one place, with simple design and flexible operation.

[0046] Fourth, the bottom of the chamber system directly integrates signal input / output interfaces, making interaction with external systems efficient and convenient.

[0047] Fifth, the entire chamber system is made of metal, making it robust, reliable, and resistant to vibration and electromagnetic interference. Attached Figure Description

[0048] Figure 1 This is a structural diagram of the sealed chamber system of a space X-ray polarization detector.

[0049] Figure 2 This is a side view of the sealed chamber system of a space X-ray polarization detector.

[0050] Figure 3 This is a diagram of the bottom structure of a closed chamber system.

[0051] Reference numerals: 1-Electronics chassis mounting hole, 2-Groove, 3-Sealing screw hole, 4-Electronics feedthrough, 5-High voltage connector, 6-Transmission window, 7-Cavity wall, 8-Air inlet, 9-Cavity bottom. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to specific embodiments.

[0053] The installation and monitoring steps for this system are as follows:

[0054] Step 1: Machining the cavity bottom 9 and cavity wall 7 of the cavity system. Nine screw holes for electronic feedthrough and one high-voltage connector are reserved on the cavity bottom 9. Two transmission windows 6 and one air inlet 8 are reserved on the cavity wall 7.

[0055] Step 2: Drill 16 sealing screw holes 3 and 1 groove 2 for filling sealing ring at the same position on the bottom surface of the cavity system 9 and the cavity wall 7.

[0056] Step 3: Solder nine 360-CRBC-1.3 high-voltage connectors 5 and one DB50 electronic feeder 4 to the bottom 9 of the chamber system to form the complete bottom 9 of the chamber system.

[0057] Step 4: Select 15mm*15mm*50um beryllium metal as the transmission window 6 and weld it to the transmission window position of the cavity wall 7 of the chamber system. After welding, fix the protective shell of the transmission window 6 and weld the CF16 flange as the air inlet 8 to the cavity wall 7 of the chamber system to form the complete cavity wall 7 of the chamber system.

[0058] Step 6: Fill the sealing ring into the groove 2 of the bottom 9 of the chamber system, align the bottom surface of the chamber system wall with it, and screw in the screw at the sealing screw hole. After tightening, a complete chamber system is formed.

[0059] Step 7: Connect a tee to the flange on the cavity wall of the chamber system. Connect one end of the tee to the vacuum gauge and the other end to the gas valve.

[0060] Step 8: Connect the other end of the gas valve to the gas cylinder, open the gas valve, and fill the chamber system with 0.5 atmospheres of working gas.

[0061] Step 9: After the vacuum gauge shows that the air pressure has reached the specified value, close the air valve and monitor the change in the vacuum count value every day. The monitoring time is ≥30 days to obtain the pressure change rate of the chamber system and verify whether the airtightness of the chamber system meets the requirements for on-orbit operation of space X-rays.

[0062] Experimental results

[0063] The constructed sealed chamber system was monitored for 30 days, and the gas pressure change was found to be <2Pa / day, which meets the requirements for on-orbit operation of space X-rays.

[0064] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit the utility model. Although the above embodiments have been described in detail, those skilled in the art can make substitutions, modifications and simple changes to them without departing from the scope of this technical solution. However, these substitutions, modifications and simple changes cannot cause the essence of the corresponding technical solution to deviate from the scope of the embodiments of this utility model.

Claims

1. A sealed chamber system for a space X-ray polarization detector, characterized in that, Includes the cavity wall (7) and the cavity floor (9); The cavity bottom (9) is provided with a groove (2), several screw holes, several high-voltage connector mounting holes and several electronic feedthrough mounting holes; The screw holes include an electronics chassis mounting hole (1) for connecting the electronics chassis and a sealing screw hole for fixing the cavity wall (7) to the cavity bottom (9); The opening of the cavity wall (7) matches the groove (2), and the opening of the cavity wall (7) is provided with a sealing screw hole that matches the position of the sealing screw hole on the cavity bottom (9); the opening of the cavity wall (7) is inserted into the groove (2) and sealed to the cavity bottom (9) through the sealing screw hole to form a closed cavity system; The high-pressure connector mounting hole is used for a sealed connection to a vacuum high-pressure connector (5) that provides high-pressure input to the X-ray detector in the sealed chamber system; The electronic feedthrough mounting hole is used for the sealed connection of the electronic feedthrough (4) for reading out the space X-ray signal observed in the sealed chamber system; The side walls of the cavity wall (7) are provided with transmission window mounting holes for sealing the transmission window (6), so that X-rays can enter the sealed cavity system through the transmission window (6) on one side, and exit the sealed cavity system through the transmission window (6) on the other side after passing through the cavity. An air inlet (8) is provided on one side wall of the cavity wall (7) for introducing working gas into the sealed cavity system.

2. The sealed chamber system of the space X-ray polarization detector according to claim 1, characterized in that, The groove is rectangular; the screw holes are evenly distributed around the outer edge of the groove; the high-voltage connector mounting holes are evenly distributed along the inner side of one side of the groove; and the electronic feedthrough mounting holes are located at the center of the cavity bottom.

3. The sealed chamber system of the space X-ray polarization detector according to claim 2, characterized in that, The mounting holes for the electronic chassis are located at the four apex corners of the groove.

4. The sealed chamber system of the space X-ray polarization detector according to claim 1, 2, or 3, characterized in that, The groove (2) is filled with a sealing ring.

5. The sealed chamber system of the space X-ray polarization detector according to claim 1, 2, or 3, characterized in that, The air inlet (8) is a flange, and the flange is connected to a gas valve for controlling the gas flow.

6. The sealed chamber system of the space X-ray polarization detector according to claim 5, characterized in that, A tee is connected between the flange and the gas valve, and one of the tee channels is connected to a barometer for monitoring the gas pressure in the sealed chamber system.

7. The sealed chamber system of the space X-ray polarization detector according to claim 5, characterized in that, One end of the flange is welded to the cavity wall (7); the transmission window is welded to the cavity wall (7).

8. The sealed chamber system of the space X-ray polarization detector according to claim 1, 2, or 3, characterized in that, A metal protective shell is installed on the outside of the transmission window (6).

9. The sealed chamber system of the space X-ray polarization detector according to claim 1, 2, or 3, characterized in that, The cavity bottom (9) and the cavity wall (7) are both made of metal.

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