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 × 10¹⁸ proton/m² flux, the damage rate of the aluminum sample was 1.30 × 10⁻³¹ Ωm³/proton at 185 MeV and that of copper was 3.60 × 10⁻³¹ Ωm³/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.

为了验证用于预测100 MeV质子辐照的金属中的辐射损伤的蒙特卡洛代码，我们开发了一种具有Gifford-McMahon（GM）低温冷却器的质子辐照设备，可对两个直径为0.25 mm的铝和铜线样品进行低温冷却。通过使用该装置，在大阪大学RCNP的回旋加速器装置的光束线下，在5 K下用200 MeV质子辐照，测量了与铜和铝的位移横截面有关的由缺陷引起的电阻率变化。照射到3.89×10后¹⁸质子/米²磁通，该铝试样的损坏速率为1.30×10 ^-31 Ωm的³ /质子在185兆电子伏和铜的那是3.60×10 ^-31 Ωm的³ /质子在196 MeV。根据通过等时退火对铝和铜中累积的缺陷的回收率的测量结果（与样品中的缺陷浓度有关），约有50％的损伤保留在40 K处，在反应堆的其他实验结果中也观察到了相同的趋势中子，聚变中子和125 MeV质子辐照。将测得的位移横截面与NRT-dpa和无热重组校正的位移损伤（arc-dpa）横截面的计算结果进行比较表明，电弧-dpa具有Almazouzi提供的铝和Nordlund产生缺陷的效率与NRT-dpa相比，用于铜的位移横截面的定量描述更好。