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中国物理学会期刊
Chinese Physics Letters Chinese Physics B 必威体育下载 物理 中国物理学会期刊网
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    Wang Xun, Zhang Feng-Qi, Chen Wei, Guo Xiao-Qiang, Ding Li-Li, Luo Yin-Hong
    Acta Phys. Sin., 2019, 68(5): 052901.
    doi: 10.7498/aps.68.20181843
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    • Abstract

      Due to the lack of available spallation neutron source, the atmospheric neutron single event effect (SEE) in China were studied mainly by means of simulation and single energy neutron test. Since the Chinese spallation neutron source (CSNS) passed the national acceptance, it has become possible to carry out the research on atmospheric neutron SEE by using the CSNS. In this paper, the neutron SEE experiments of 3 kinds of SRAMs with different feature sizes are carried out for the first time by using the CSNS back-n. The application of CSNS back-n in the study of atmospheric neutron SEE is evaluated by comparing with the results of the earlier plateau experiment. The results show that the cross section of the single event upset is smaller than that of the plateau test, and the cross sections of different devices have no obvious monotonic relationship with feature size. The reason for the former result is that the energy spectrum of CSNS back-n is slightly softer than that of the atmospheric neutron. The reason for the second result is that small feature size means small critical charge and small sensitive volume, and these two factors compete with each other when they make the contribution to the cross section. According to the difference in energy spectrum and cross section among the SRAM devices, a correction factor is proposed to correct the test results based on CSNS back-n. For the difference in energy spectrum, different energy thresholds will produce different ratios between the cross sections by using CSNS back-n and atmospheric neutron. The neutrons of CSNS back-n are mainly concentrated around 1 MeV, which is close to the energy threshold of general SRAM devices. Thus, inaccurate energy threshold estimation will introduce a large error into the cross section of SEU. Thus, the relation between the correction factor and the energy threshold is analyzed. If 12 MeV is selected as the energy threshold to calculate the cross section, more consistent results could be obtained for our DUT in CSNS back-n and atmospheric neutron environment. In a word, the results show that the CSNS back-n can be used to speed up the atmospheric neutron SEE test, but the result should be corrected to evaluate the threat from atmospheric neutron. Fortunately, with the continuous increase of CSNS operating power, the neutron flux and the accelerated factor of CSNS will increase synchronously. Besides, other 3 white light neutron beams are planned in the CSNS project, the planned energy spectra are closer to those of atmospheric neutron. It is expected that the CSNS will be better applied to the study of atmospheric neutron SEE.

        Authors and contacts

          • Corresponding author:Wang Xun,wangxun@nint.ac.cn
        • Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11690040, 11690043, 61634008).

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        中子源 中子谱 优点 缺点 相关文献报道
        国外 国内
        航空高度环境 完全相同 无误差环境 成本高 √ ×
        地面大气环境 谱形状相同 无误差环境 注量率低耗时长 √ ×
        散裂中子源 谱形状相似能量范围不同 能谱范围大注量率高 模拟源少 √ ×
        单能中子源 单能 模拟源多成本低 需要多个能量点 √ √
        DownLoad: CSV

        型号 制造商 容量/bits 特征尺寸/${\text{μ}}{\rm m}$ 工作电压/V
        HM62V8100 RENESAS 8 M (1 M × 8 bit) 0.18 3
        HM628512B HITACHI 4 M (512 K × 8 bit) 0.35 5
        HM628512A HITACHI 4 M (512 K × 8 bit) 0.50 5
        DownLoad: CSV

        型号 测试图形 总容量/bit 总注量/n·cm–2 有效注量占比/% 翻转数(#) 翻转截面/cm2·bit–1 置信水平/%
        HM62V8100 0x00H 24M 2.90 × 109 45.73 343 1.02 × 10–14 94.6
        0x55H 24M 2.89 × 109 45.73 367 1.10 × 10–14 94.8
        0xAAH 24M 2.89 × 109 45.73 387 1.16 × 10–14 94.9
        0xFFH 24M 2.93 × 109 45.73 342 1.01 × 10–14 94.6
        HM628512B 0x00H 12M 3.12 × 109 45.73 207 1.15 × 10–14 93.0
        0x55H 8M 3.84 × 109 45.73 197 1.34 × 10–14 92.9
        0xAAH 12M 4.90 × 109 45.73 303 1.07 × 10–14 94.3
        0xFFH 12M 1.78 × 109 45.73 114 1.11 × 10–14 90.6
        HM628512A 0x00H 12M 3.03 × 109 45.73 176 1.01 × 10–14 92.5
        0x55H 12M 3.94 × 109 45.73 262 1.16 × 10–14 93.8
        0xAAH 12M 2.94 × 109 45.73 215 1.27 × 10–14 93.2
        0xFFH 12M 2.93 × 109 45.73 205 1.22 × 10–14 93.0
        DownLoad: CSV

        型号 总容量/bit 测试时长/h 翻转数(#) 翻转率/#·bit–1·h–1 翻转截面/cm2·bit–1 置信水平/%
        HM62V8100 8M × 573 6085 195 6.67 × 10–12 5.21 × 10–14 98.6
        HM628512B 4M × 1221 5198 181 6.80 × 10–12 5.31 × 10–14 98.3
        HM628512A 4M × 635 5198 76 5.49 × 10–12 4.29 × 10–14 97.4
        DownLoad: CSV

        中子源 中子数占比/% 通量/cm2·s–1(> 1 MeV)
        1—10 MeV 10—100 MeV > 100 MeV
        JEDEC(地面) 35 35 30 5.56 × 10–3
        IEC(12 km) 36.5 37.2 26.3 2.43 × 100
        羊八井 35.6 32.1 32.3 3.56 × 10–2
        CSNS-back-n @76 81.7 16.8 1.5 7.32 × 105(20 kW)
        CSNS-TS1-41° @20 m 50 28 22 —
        CSNS-TS2-30° 44 28.5 27.5 —
        CSNS-TS2-15° 22.6 25 52.4 —
        DownLoad: CSV

        型号 能量阈值/MeV 有效注量占比/% 翻转截面/cm2·bit–1
        CSNS back-n 羊八井 CSNS back-n 羊八井
        HM62V8100 0.6 59.23 51.13 8.50 × 10–15 4.70 × 10–14
        HM628512B 2.5 26.61 38.02 2.30 × 10–14 6.43 × 10–14
        HM628512A 6.0 13.48 32.16 3.94 × 10–14 6.15 × 10–14
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        型号 不同能量阈值取值时的修正因子
        10 MeV 12 MeV 14 MeV
        HM62V8100 1.33 1.19 1.05
        HM628512B 1.12 1.00 0.88
        HM628512A 1.04 0.93 0.81
        DownLoad: CSV
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      Publishing process
      • Received Date:12 October 2018
      • Accepted Date:21 November 2018
      • Available Online:01 March 2019
      • Published Online:05 March 2019

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