A measurement and monitoring device suitable for large-scale heavy ion beam current

Abstract

The present invention belongs to the technical field of ion beam flow measurement, and specifically relates to a measurement and monitoring device suitable for a large range of heavy ion beam flows, comprising an irradiation target chamber (1) with an entrance port (6) at one end, a sample moving platform (2) provided in the irradiation target chamber (1), a measurement detector provided on the sample moving platform (2), and the measurement detector used to measure the fluence rate of the heavy ion beam flow entering from the entrance port (6), and a collimator provided on the entrance port (6). The present invention can accurately measure the fluence rate at different height positions before device irradiation, thereby ensuring the accuracy of irradiation data; it can also accurately monitor the total fluence irradiated to the device surface during the device irradiation process without affecting the device irradiation experimental research, thereby providing basic data for the radiation resistance research of space-borne electronic components.

Description

Technical Field

[0001] The invention belongs to the technical field of ion beam current measurement, and in particular relates to a measurement and monitoring device suitable for a large range of heavy ion beam currents. Background Art

[0002] While in orbit, spacecraft are exposed to an extremely harsh space radiation environment, including galactic cosmic rays, solar cosmic rays, and particles trapped in the Earth's captured belt. Heavy ion irradiation of the electronic devices within them can cause single-particle effects (SEPs), leading to device malfunction or even burnout, thus affecting the spacecraft's mission. Therefore, it is necessary to study the SEPs of aerospace electronic devices and assess their radiation resistance. Due to the high cost, long cycle, and poor repeatability of space travel, the most common method is to conduct accelerator simulation tests on the ground to measure the SEP cross-section curve of the device. This is then combined with a model of the space application orbital radiation environment to estimate the device's on-orbit failure rate.

[0003] When simulating the heavy ion space radiation effects on the ground, due to the complexity of the space radiation environment and the different sizes, sensitivities, and test effect types of different aerospace devices, the requirements for the beam quality, especially the monitoring accuracy of the fluence / fluence rate, in heavy ion irradiation experiments are very stringent, whether for mechanism research or evaluation and assessment. It is necessary to establish a special fluence / fluence rate measurement and monitoring device to ensure the accuracy of the beam condition monitoring measurement during the device irradiation process. Summary of the Invention

[0004] The purpose of the present invention is to provide a measurement and monitoring device suitable for a large range of heavy ion beams based on a heavy ion single particle effect irradiation terminal. Before the device is irradiated, the fluence rate at different height positions can be accurately measured to ensure the accuracy of the irradiation data; during the device irradiation process, the total fluence irradiated to the device surface can be accurately monitored without affecting the device irradiation experimental research, providing basic data for the radiation resistance research of space-borne electronic components.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is a measurement and monitoring device suitable for a large range of heavy ion beams, which includes an irradiation target chamber with an incident port at one end, a sample moving platform provided in the irradiation target chamber, a measurement detector provided on the sample moving platform, and the measurement detector is used to measure the fluence rate of the heavy ion beam entering from the incident port, and a collimator is provided on the incident port.

[0006] Furthermore, the measurement detector is arranged on the front surface of the sample moving platform facing the incident port, and includes a first detector, a second detector and a third detector.

[0007] Furthermore, the first detector, the second detector and the third detector are all columnar structures, with their bottom ends vertically arranged on the front surface of the sample moving platform facing the incident port and their top ends close to the incident port.

[0008] further,

[0009] The distance between the detection sensitive area at the top of the first detector and the front surface of the sample moving platform is 4 cm;

[0010] The detection sensitive area at the top of the third detector is 9 cm away from the front surface of the sample moving platform;

[0011] fitting the fluence rates measured by the first detector and the third detector;

[0012] The distance between the detection sensitive area at the top of the second detector and the front surface of the sample moving platform is 4 cm.

[0013] Furthermore, the first detector, the second detector and the third detector are plastic scintillator detectors.

[0014] Furthermore, the collimator is composed of four metal plates, and the middle area surrounded by the four metal plates constitutes a rectangular incident hole. The positions of the four metal plates can be adjusted to adjust the size of the incident hole and obtain beam spots of different diameters.

[0015] Furthermore, an alignment hole adjustment plate is provided on each of the metal plates, and three alignment holes are provided on the alignment hole adjustment plate, and the diameters of the alignment holes are 5 mm, 3 mm and 1 mm respectively.

[0016] Furthermore, a fourth detector is provided on each of the metal plates as a monitoring detector; by rotating the collimation hole adjustment plate, the center of one of the collimation holes is aligned with the center of the fourth detector each time.

[0017] The beneficial effects of the present invention are:

[0018] 1. The device can accurately measure the fluence rate at different heights before irradiation to ensure the accuracy of irradiation data.

[0019] 2. During the device irradiation process, the total dose irradiated to the device surface can be accurately monitored without affecting the device irradiation experimental research, providing basic data for the radiation resistance research of space-borne electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a measurement and monitoring device (excluding a collimator) suitable for a large range of heavy ion beam currents as described in a specific embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a collimator described in a specific embodiment of the present invention;

[0022] In the figure: 1-irradiation target chamber, 2-sample moving platform, 3-second detector, 4-first detector, 5-third detector, 6-incident port, 7-metal plate, 8-collimation hole adjustment plate, 9-incident hole. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] The present invention provides a measurement and monitoring device suitable for a large range of heavy ion beams (see Figure 1 ), which includes an irradiation target chamber 1 with an incident port 6 at one end, a sample moving platform 2 provided in the irradiation target chamber 1, a measuring detector provided on the sample moving platform 2, and the measuring detector is used to measure the fluence rate of the heavy ion beam entering from the incident port 6, and a collimator is provided on the incident port 6.

[0025] The measurement detector is arranged on the front surface of the sample moving platform 2 facing the incident port 6 , and includes a first detector 4 , a second detector 3 and a third detector 5 .

[0026] The first detector 4 , the second detector 3 and the third detector 5 are all columnar structures, with their bottom ends vertically arranged on the front surface of the sample moving platform 2 facing the incident port 6 and their top ends close to the incident port 6 .

[0027] The distance between the detection sensitive area at the top of the first detector 4 and the front surface of the sample moving platform 2 is 4 cm (i.e., the height of the first detector 4 is 4 cm);

[0028] The distance between the detection sensitive area at the top of the third detector 5 and the front surface of the sample moving platform 2 is 9 cm (i.e., the height of the third detector 5 is 9 cm);

[0029] The fluence rates measured by the first detector 4 and the third detector 5 are fitted and extrapolated to obtain the fluence rates at other heights;

[0030] The distance between the detection sensitive area at the top of the second detector 3 and the front surface of the sample moving platform 2 is 4 cm (ie, the height of the second detector 3 is 4 cm). The second detector 3 is used to measure low fluence rate.

[0031] The first detector 4 , the second detector 3 and the third detector 5 are plastic scintillator detectors.

[0032] Before device irradiation, the fluence rate must be adjusted to meet the requirements of effect testing. When the DUT is mounted on the sample holder, there is a certain height difference from the front surface of the sample holder due to factors such as the device shape, sub-board shape, and external cables. The beam intensity varies at different locations along the beam direction, so corrections are required to ensure accurate beam fluence rate measurements at different DUT heights. Statistics were collected for the installation heights (distance from the front surface of the sample moving platform 2) of user DUTs used in experimental research conducted at the HI-13 tandem accelerator heavy ion single event effect irradiation terminal over a one-year period over four experimental cycles. Based on these statistics, two sets of first and third detectors 4 and 5 were installed at different heights, with the detector sensitive areas at 4 cm and 9 cm from the front surface of the sample holder, respectively. Most DUTs fall within this height range. Furthermore, based on the accelerator's beam current, the beam divergence characteristic can be assumed to be a linear function of distance within a certain range. Therefore, the fluence rates measured at these two sets of detectors at different heights were fitted and extrapolated to obtain the fluence rates at other heights.

[0033] In addition, according to the above, during the fluence rate adjustment process, if a lower fluence rate needs to be measured, a larger collimator hole or a longer time is required. In order to save beam time, a Φ4mm detector collimator hole can be selected for fluence rate measurement. This detector is Figure 1 The height of the second detector 3 is set to 4 cm.

[0034] Collimator (see Figure 2 ) consists of four metal plates 7, the middle area surrounded by the four metal plates 7 constitutes a rectangular incident hole 9, the positions of the four metal plates 7 can be adjusted (moved in a one-dimensional plane), so as to adjust the size of the incident hole 9 and obtain beam spots of different diameters.

[0035] A collimation hole adjustment plate 8 is provided on each metal plate 7 . The collimation hole adjustment plate 8 is provided with three collimation holes. The diameters of the collimation holes are 5 mm, 3 mm and 1 mm respectively.

[0036] On each metal plate 7, a fourth detector is provided as a monitoring detector; by rotating the collimation hole adjustment plate 8, the center of one collimation hole is aligned with the center of the fourth detector each time.

[0037] The fourth detector (monitoring detector) is mainly used to monitor the total fluence during the device irradiation process. Therefore, the detector needs to be installed outside the user beam area. The specific installation plan is as follows: Figure 2 As shown, the shaded portion in the figure represents the beam spot available to the user (the incident hole 9 in the figure).

[0038] Design of collimating holes

[0039] In the process of single-particle effect cross-section test, the error range of the dose is required. If the relative standard error of the count in the dose measurement is required to be υ N , then according to the nuclear physics experimental method:

[0040]

[0041] Where N is the detector count.

[0042] Before the single event effect test, the heavy ion injection rate F needs to be measured by the detector. Generally, F is selected as 1×10 3 -1×10 4 ions / cm 2 / s range, the detector count can be expressed as:

[0043]

[0044] Where D is the diameter of the detector collimation hole and t is the measurement time. In order to reduce the error caused by beam fluctuation, the measurement time is usually 60s, so the range of count N is 4.71×10 4 ×D 2 -4.71×10 5 ×D 2 According to the user's test data requirements, the corresponding collimation hole can be selected to measure the injection rate.

[0045] In general, the diameter of the detector collimator hole is Φ1mm, so the minimum count is 471, and the relative standard error of the count is less than 4.6%. If a lower fluence rate is required in the experiment, the measurement time can be extended or a larger collimator hole can be used. For example, a collimator hole with a diameter of Φ4mm can meet the requirement of F of 1×10 2 ions / cm 2 / s measurement requirements.

[0046] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the scope of the technical innovation of the present invention.

Claims

1. A measurement and monitoring device suitable for a large range of heavy ion beam currents, characterized by: The invention comprises an irradiation target chamber (1) having an entrance port (6) at one end, a sample moving platform (2) being provided in the irradiation target chamber (1), a measuring detector being provided on the sample moving platform (2), the measuring detector being used to measure the fluence rate of the heavy ion beam entering from the entrance port (6), and a collimator being provided on the entrance port (6); The measurement detector is arranged on the front surface of the sample moving platform (2) facing the incident port (6), and includes a first detector (4), a second detector (3) and a third detector (5); The first detector (4), the second detector (3) and the third detector (5) are all columnar structures, with their bottom ends vertically arranged on the front surface of the sample moving platform (2) facing the incident port (6), and their top ends close to the incident port (6); The distance between the detection sensitive area at the top of the first detector (4) and the front surface of the sample moving platform (2) is 4 cm; The distance between the detection sensitive area at the top of the third detector (5) and the front surface of the sample moving platform (2) is 9 cm; Fitting the fluence rates measured by the first detector (4) and the third detector (5); The distance between the detection sensitive area at the top of the second detector (3) and the front surface of the sample moving platform (2) is 4 cm.

2. The device for measuring and monitoring a large-scale heavy ion beam according to claim 1, wherein: The first detector (4), the second detector (3) and the third detector (5) are plastic scintillator detectors.

3. The device for measuring and monitoring a large-scale heavy ion beam according to claim 2, wherein: The collimator is composed of four metal plates (7), the middle area surrounded by the four metal plates (7) forms a rectangular incident hole (9), and the positions of the four metal plates (7) can be adjusted, thereby adjusting the size of the incident hole (9) and obtaining beam spots of different diameters.

4. A measurement and monitoring device suitable for a large range of heavy ion beams as claimed in claim 3, characterized in that: Each of the metal plates (7) is provided with a collimation hole adjustment plate (8), and the collimation hole adjustment plate (8) is provided with three collimation holes, and the diameters of the collimation holes are 5 mm, 3 mm, and 1 mm, respectively.

5. A measurement and monitoring device suitable for a large range of heavy ion beams as claimed in claim 4, characterized in that: Each of the metal plates (7) is also provided with a fourth detector as a monitoring detector; by rotating the collimation hole adjustment plate (8), the center of one of the collimation holes is aligned with the center of the fourth detector each time.

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