用于Z箍缩功率密度测量的针孔阵列设计
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摘要
针对"强光一号"加速器Z箍缩负载产生的总能量约40kJ软X射线功率密度测量问题,提出了利用针孔阵列对距离负载中心较近处试验面的功率密度进行衰减的物理方案,分析了针孔成像原理,设计了针孔阵列,计算了阵列衰减因数。分析计算结果表明,设计的针孔阵列可有效对软X射线功率密度进行衰减,衰减因数为4×10~(-6)。同时,该针孔阵列可对由磁流体力学不稳定性引起的Z箍缩软X射线辐射源成像光强不均匀现象起到匀化作用,从而使利用该针孔阵列对试验面功率密度进行测量具备了可行性。
For measurement of the power density of soft X-ray radiated by Z pinch load on Qiangguang-I generator with a total energy of 40 kJ,apinhole array is designed to effectively decay the power density on the test plane which is very close to the Z pinch source.Based on the principle of the pinhole image,the configuration of the pinhole array is designed,and the attenuation coefficient of the pinhole array is calculated.The results show that the pinhole array is feasible to be used as an attenuator with attenuation coefficient of 4×10~(-6),and the pinhole array can also mitigate the non-uniformity of Z pinch X-ray source caused by magnetohydrodynamic(MHD)instability.The measurement of X-ray power density on the test plane is practical by adding apinhole array in the system.
For measurement of the power density of soft X-ray radiated by Z pinch load on Qiangguang-I generator with a total energy of 40 kJ,apinhole array is designed to effectively decay the power density on the test plane which is very close to the Z pinch source.Based on the principle of the pinhole image,the configuration of the pinhole array is designed,and the attenuation coefficient of the pinhole array is calculated.The results show that the pinhole array is feasible to be used as an attenuator with attenuation coefficient of 4×10~(-6),and the pinhole array can also mitigate the non-uniformity of Z pinch X-ray source caused by magnetohydrodynamic(MHD)instability.The measurement of X-ray power density on the test plane is practical by adding apinhole array in the system.
引文
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[11]JONES M C,AMPLEFORD D J,CUNEO M E,et al.X-ray power and yield measurements at the refurbished Z machine[J].Rev Sci Instrum,2014,85(8):083501.
[2]KUAI B,CONG P T,ZENG Z Z,et al.An experimental study on Kr gas-puff Z-pinch[J].Plasma Science&Technology,2002,4(3):1 329-1 334.
[3]邱爱慈,蒯斌,王亮平,等.强光一号Z箍缩实验研究[J].强激光与粒子束,2008,20(11):1 761-1 772.(QIU Ai-ci,KUAI Bin,WANG Liang-ping,et al.Experimental research on Z-pinch at Qiangguang-I facility[J].High Power Laser and Particle Beams,2008,20(11):1 761-1 772.)
[4]LIN P,WANG X J,WANG D W,et al.Experimental studies on radiation behavior of composites induced by pulsed soft X-ray[J].Journal of Materials Science and Engineering,2006,24(1):6-9.
[5]KANIA D R,PAN L S,BELL P,et al.Absolute X-ray power measurements with subnanosecond time resolution using type IIa diamond photoconductors[J].J Appl Phys,1990,68(1):124-130.
[6]SPIELMAN R B,DEENEY C,FEHL D L,et al.Fast resistive bolometry[J].Rev Sci Instrum,1999,70(1):651-655.
[7]郭硕鸿.电动力学[M].北京:高等教育出版社,1995.(GUO Shuo-hong.Electrodynamics[M].Beijing:Higher Education Press,1995.)
[8]WANG L P,WU J,LI M,et al.Characteristics of implosion and radiation for aluminum planar wire array Z pinch at1.5 MA[J].Physics of Plasmas,2012,19(12):122707.
[9]王秉超,李良德,马文琦,等.光学[M].长春:吉林大学出版社,1991.(WANG Bing-chao,LI Liang-de,MA Wen-qi,et al.Optics[M].Changchun:Jilin University Press,1991.)
[10]IVES H C,STYGAR W A,FEHL D L,et al.Measurement of the energy and power radiated by apulsed blackbody X-ray source[J].Phys Rev S T Accel Beams,2006,9(11):110401.
[11]JONES M C,AMPLEFORD D J,CUNEO M E,et al.X-ray power and yield measurements at the refurbished Z machine[J].Rev Sci Instrum,2014,85(8):083501.