Performance Testing of a Large-Format X-ray Reflection Grating Prototype for a Suborbital Rocket Payload

B. Donovan, R. McEntaffer, C. DeRoo, J. Tutt, F. Gris'e, Chad M. Eichfel, Oren Z. Gall, V. Burwitz, G. Hartner, C. Pelliciari, Marlis-Madeleine La Caria
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引用次数: 6

Abstract

The soft X-ray grating spectrometer on board the Off-plane Grating Rocket Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum of an astrophysical object when it is launched via suborbital rocket. Paramount to the success of the spectrometer are the performance of the $>250$ reflection gratings populating its reflection grating assembly. To test current grating fabrication capabilities, a grating prototype for the payload was fabricated via electron-beam lithography at The Pennsylvania State University's Materials Research Institute and was subsequently tested for performance at Max Planck Institute for Extraterrestrial Physics' PANTER X-ray Test Facility. Bayesian modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling indicated that the grating achieved the OGRE single-grating resolution requirement of $R_{g}(\lambda/\Delta\lambda)>4500$ at the 94% confidence level. The resulting $R_g$ posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite $R_g$ parameter space was sampled and the model could not constrain the upper bound of $R_g$ to less than infinity. Raytrace simulations of the system found that the observed data can be reproduced with a grating performing at $R_g=\infty$. It is therefore postulated that the behavior of the obtained $R_g$ posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on $R_g$. Implications of these results and improvements to the test setup are discussed.
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亚轨道火箭载荷大口径x射线反射光栅样机性能测试
离机光栅火箭实验(OGRE)机载软x射线光栅光谱仪希望通过亚轨道火箭发射获得天体物理物体的最高分辨率软x射线光谱。对于光谱仪的成功至关重要的是其反射光栅组件中$>250$反射光栅的性能。为了测试当前的光栅制造能力,宾夕法尼亚州立大学材料研究所通过电子束光刻技术制造了有效载荷的光栅原型,随后在马克斯普朗克地外物理研究所的PANTER x射线测试设施进行了性能测试。通过马尔可夫链蒙特卡罗(MCMC)采样对所得数据进行贝叶斯建模,表明该光栅在94时达到了OGRE单光栅分辨率$R_{g}(\lambda/\Delta\lambda)>4500$的要求% confidence level. The resulting $R_g$ posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite $R_g$ parameter space was sampled and the model could not constrain the upper bound of $R_g$ to less than infinity. Raytrace simulations of the system found that the observed data can be reproduced with a grating performing at $R_g=\infty$. It is therefore postulated that the behavior of the obtained $R_g$ posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on $R_g$. Implications of these results and improvements to the test setup are discussed.
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