CAJ | 학술논문

研制了一台一维位置灵敏电离室.该电离室的收集电极由两块完全一样的相互独立并彼此绝缘的单元构成,每个单元有两路劈裂式极板,根据输出的电流信号可获得X光束的强度和位置.该电离室在上海光源(SSRF)生物大分子晶体学光束线上进行了实验测试,测试中采用了一个标准电离室作为强度测量对照.一维位置灵敏电离室被固定在一维电控滑台上,在水平方向上移动电控滑台逐步扫描测试光束的位置.测量时,光子能量为8 keV,扫描范围为10 mm,重复扫描12次;测试内容包括电离室的坪区、线性度、位置测量精度及光强.结果表明,该电离室的线性度较好,位置测量精度好于20 μm,线性测量范围为6 mm.它将安装在生物大分子晶体学光束线站上用于光束稳定性的监测.
연제료일태일유위치령민전리실.해전리실적수집전겁유량괴완전일양적상호독립병피차절연적단원구성,매개단원유량로벽렬식겁판,근거수출적전류신호가획득X광속적강도화위치.해전리실재상해광원(SSRF)생물대분자정체학광속선상진행료실험측시,측시중채용료일개표준전리실작위강도측량대조.일유위치령민전리실피고정재일유전공활태상,재수평방향상이동전공활태축보소묘측시광속적위치.측량시,광자능량위8 keV,소묘범위위10 mm,중복소묘12차;측시내용포괄전리실적평구、선성도、위치측량정도급광강.결과표명,해전리실적선성도교호,위치측량정도호우20 μm,선성측량범위위6 mm.타장안장재생물대분자정체학광속선참상용우광속은정성적감측.
A one-dimensional position-sensitive ionization chamber has been designed and fabricated. The cathode of this ionization chamber consists of two selfsame units that are insulated from each other and each unit is divided into two-way cleft plates. From current output signals, it can offer the intensity and position of X-ray beam. The ionization chamber was installed on a SSRF macromolecular crystallography beamline and its performance was tested. In the test,a standard ionization chamber was used for the comparison of beam intensity measurement. The one-dimensional position-sensitive ionization chamber was fixed on a high precision linear motor stage and was driven on horizontal direction to scan the beam position step by step, In which the beam energy was set to be 8 keV and the scanning range to be 10 mm. The position scan was repeated 12 times. The tested specifications were plateau curves, linearity, position resolution and the intensity of beam. The results indicate that the 1-D position-sensitive ionization chamber has a good linearity and its position resolution is better than 20 μm and linear measuring range is 6 mm. Moreover,it will be installed on the beamline of SSRF for monitoring the stability of beam.