不同能量光子辐照电缆响应规律研究

Responses Laws of Coaxial Cable to Different X-ray Energy

利用时域传输线(TL)方法计算了不同能量光子辐照同轴屏蔽电缆时的响应规律。计算结果表明:光子能量不同时,电缆介质层中沉积电荷分布不同导致电缆响应极性发生了变化;光子能量增大到一定值后,响应变化幅度很小;1MeV的单能电子经钽靶发生韧致辐射后在电缆上的瞬态辐照响应是前向电子和光子在电缆上响应的综合,两者在电缆上的电压响应均为负值,幅度差别在1.8倍以内;钽靶后面增加一定厚度的铝材料,可明显减小前向电子在电缆响应中的比例。

The responses of coaxial cable to different X-ray energy were calculated using transmission line（TL） method.The numerical results indicate that the response polarity is sensitive to the distribution of charges in medium layer for different photon energy,and the responses do not increase when the photon energy reaches to a certain level.For 1 MeV electron beams irradiating the tantalum target,the cable responses are combination effects due to forward electrons and photons,which are negative respectively,and the responses of forward electrons are larger than that of photons by 1.8 times at the most,and the responses of forward electrons distinctly decrease when aluminum materials are added behind the tantalum target.