利用薄片石英测量电子束热激波

The measurement of thermal shock waves induced by electron beam by using thin slice quartz

介绍了在“闪光二号”脉冲电子柬加速器上采用X切割薄片石英压电传感技术测量热激波的情况。传感器通过对压电信号的积分得到热激波波形，克服了厚石英晶体传感技术测量有效时间受厚度限制的缺点。实验得出：（1）一维应变冲击条件下，在1400MPa应力以下，薄片石英压电系数平均为2．10pc／N；（2）靶后固定位置的热激波峰值与入射电子束能注量成线性增加关系；（3）涂层材料对内层靶表面形成了有效保护，并有效降低了靶中传播的热激波峰值强度；（4）在一维应变状态下，石英晶片工作面积大，压电信号的信噪比高，特别适合用于复合材料中的热激波测量。

In this paper, on ＂FLASH II＂ pulse electron beam accelerator, the measurement technology of thermal shock waves induced by electron beam using x-cut thin slice quartz piezoelectric transducer is introduced. By integrating the piezoelectric signal, transducers obtain the thermal shock wave waveform, which overcomes the thickness limitation of thick quartz crystal sensing technology during the effective time range of measurement. Experimental results indicate： （1） Under the condition of one dimensional strain shock, the average piezoelectric coefficient of thin quartz is 2.10 pc/N, within the range of 1400Mpa stress. （2） The peak values of thermal shock wave at a fixed position behind the target increase linearly with the increase of energy fluence of incident electron beam. （3） The coating material can effectively protect the inner target surface and reduce the peak intensity of thermal shock wave propagating in the target. （4） Under the condition of one-dimensional strain, thin slice quartz has large working area and high signal-to-noise ratio （SNR） of piezoelectric signal. It is especially suitable for thermal shock wave measurement in composite materials.