“阳”加速器钛丝X箍缩光源辐射特性实验研究

Experimental investigation of radiation charactristics of Ti wire X-pinch X-ray source on Yang accelerator

为了利用X箍缩产生的点光源作为背光光源对丝阵Z箍缩内爆早期的负载内部结构进行背光照相,在"阳"加速器(电流峰值为500—800 kA,上升时间约80 ns)上开展了钛丝(丝交叉角度为60°)X箍缩光源辐射特性的初步实验研究.通过X射线二极管探测器、透射光栅谱仪、晶体谱仪和狭缝相机等诊断设备获取了箍缩点光源的辐射功率达到1.5 GW左右,辐射能量约为1 J,光子能量为keV量级的辐射能谱范围主要集中在1—4 keV能段,点光源尺寸小于15μ.tm,其时间尺度(辐射脉冲半高宽)达到了200 ps.对光源特征信息进行了初步分析,同时掌握了有效获取钛丝X箍缩单脉冲点光源的方法.

The X-ray radiation properties of titanium wire X-pinch are investigated on the Yang accelerator at 500-800 kA peak current with a rise time of about 80 ns. The radiation power, spectrum and source size of the X-pinch X-ray source are measured and analyzed using X-ray diodes, a transmission grating spectrometer, a crystal spectrometer and a slit camera. The hot dense spot smaller than 15 ~tm emits 1 J of X-ray with an FWHM of 200 ps and a peak power of 1.5 GW distributed in the range of 1--4 keV. A method to efficiently generate a single X-ray pulse during the X-pinch implosion is demonstrated. The X-pinch presented here is useful for imaging the early stage interior structure of Z pinch as a backlight source.