CAJ | 학술논문

一维位置灵敏单丝气体探测器采用单根镀金钨丝和200根阴极感应条的探测结构， X射线在阳极丝上产生的信号被多个阴极条感应，利用重心法得到X射线的原初电离点的位置信息，位置分辨率达到160μm(半高全宽).在同步辐射衍射实验中， X射线通过样品后会形成不同大小的衍射环，本实验中测量得到11.148?和14.201?的两组衍射角位置信息；通过平行移动一维探测器在衍射环范围内多次扫描，可以重建得到二维衍射环.由于一维探测器的气体厚度和入射窗宽度会给测量结果带来像差，分析发现像差的影响大于一维探测器的位置分辨.基于相应的物理分析对测量到的衍射位置进行修正，修正后的衍射位置相比修正前的衍射位置的相对像差最大改善达到7%，该方法实现了无像差二维衍射环的重建.
일유위치령민단사기체탐측기채용단근도금오사화200근음겁감응조적탐측결구， X사선재양겁사상산생적신호피다개음겁조감응，이용중심법득도X사선적원초전리점적위치신식，위치분변솔체도160μm(반고전관).재동보복사연사실험중， X사선통과양품후회형성불동대소적연사배，본실험중측량득도11.148?화14.201?적량조연사각위치신식；통과평행이동일유탐측기재연사배범위내다차소묘，가이중건득도이유연사배.유우일유탐측기적기체후도화입사창관도회급측량결과대래상차，분석발현상차적영향대우일유탐측기적위치분변.기우상응적물리분석대측량도적연사위치진행수정，수정후적연사위치상비수정전적연사위치적상대상차최대개선체도7%，해방법실현료무상차이유연사배적중건.
The one-dimensional position sensitive wire gaseous detector is developed for the synchrotron radiation diffraction, which consists of a single wire of gold-plated tungsten and 200 cathode strips as the readout. The induced signal is produced by the several adjacent cathode strips when X-ray is incident on anode wire with high voltage. Using the center gravity method to analyze the adjacent signals in one dimension, the primary ionization position of the X-ray can be obtained and the position resolution is 160 μm (FWHM). In Beijing Synchrotron Radiation Facility, the diffraction test is done at the experimental station. When the X-ray irradiates the crystal sample of SiO2, the different sizes of the diffraction rings can be produced. The diffraction angles are measured to be 11.148? and 14.201?, and the two-dimensional diffraction rings are reconstructed when the detector is moved and scanned with the several steps in the diffraction ring range. The diffraction aberration of one-dimensional wire chamber is very obvious. In the paper, the relevant influence factors of the detector construct are discussed. The thickness of the working gas and the width of active area window can give rise to the diffraction ring aberration. The theoretical calculation value of the diffraction aberration is larger than the position resolution value of the gaseous detector. The correction method is established based on the corresponding physical analysis, and by this method the value of the diffraction ring point is calculated. The relative aberration of diffraction position is improved by up to 7%with using the method, and the two-dimensional diffraction ring with no aberration can be reconstructed.