Measurement of displacement cross sections of aluminum and copper at 5 K by using 200 MeV protons
Measurement of displacement cross sections of aluminum and copper at 5 K by using 200 MeV protons
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DOI：
10.1016/j.jnucmat.2018.05.038
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发表时间：
2018-09
影响因子：
3.1
通讯作者：
Y. Iwamoto;M. Yoshida;T. Yoshiie;D. Satoh;H. Yashima;H. Matsuda;S. Meigo;T. Shima
中科院分区：
文献类型：
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作者：
Y. Iwamoto;M. Yoshida;T. Yoshiie;D. Satoh;H. Yashima;H. Matsuda;S. Meigo;T. Shima
为了验证预测 > 100 MeV质子辐照金属辐射损伤的蒙特卡罗代码，我们开发了一种质子辐照装置，该装置带有Gifford-McMahon （GM）制冷机，对直径为0.25 mm的铝和铜导线样品进行低温冷却。利用该装置，在大阪大学RCNP回旋加速器的束流线上，测量了200 mev质子以5 K 照射下铜和铝的缺陷电阻率与位移截面相关的变化。辐照后3.89 × 1018质子/ m2flux,铝样品的损坏率是1.30 × 10−31Ωm3 /质子在185 兆电子伏,铜3.60 × 10−31Ωm3 /质子在196 兆电子伏。通过等时退火对铝和铜中累积缺陷的恢复测量（与样品中缺陷浓度有关），约50%的损伤在40 K时仍然存在，在反应堆中子、聚变中子和125-MeV质子辐照的其他实验结果中也观察到同样的趋势。将实测位移截面与NRT-dpa和热重组校正位移损伤（arc-dpa）截面的计算结果进行比较，结果表明，Almazouzi和Nordlund给出的铝和铜缺陷生产效率的arc-dpa比NRT-dpa能更好地定量描述位移截面。
To validate the Monte Carlo codes for prediction of radiation damage in metals irradiated by > 100 MeV protons, we developed a proton irradiation device with a Gifford–McMahon (GM) cryocooler to cryogenically cool two 0.25-mm-diameter wire samples of aluminum and copper. By using this device, the defect-induced electrical resistivity changes related to the displacement cross section of copper and aluminum were measured under irradiation with 200-MeV protons at 5 K at the beamline of the cyclotron facility at RCNP, Osaka University. After irradiation to a 3.89 × 1018proton/m2flux, the damage rate of the aluminum sample was 1.30 × 10−31Ωm3/proton at 185 MeV and that of copper was 3.60 × 10−31Ωm3/proton at 196 MeV. Based on measurements of recovery of the accumulated defects in aluminum and copper through isochronal annealing, which is related to the defect concentration in the sample, about 50% of the damage remained at 40 K, with the same tendency observed in other experimental results for reactor neutron, fusion neutron, and 125-MeV proton irradiations. A comparison of the measured displacement cross sections with the calculated results of the NRT-dpa and the athermal-recombination-corrected displacement damage (arc-dpa) cross sections indicates that arc-dpa with the defect production efficiencies provided by Almazouzi for aluminum and Nordlund for copper provide better quantitative descriptions of the displacement cross section than NRT-dpa.