Ray-tracing simulations for the ultra-lightweight X-ray optics toward a future jupiter exploration mission

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• 作者：I. Mitsuishi^a ; ^b ; ^{mitsuisi@u.phys.nagoya-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Y. Ezoe^a ; T. Ogawa^a ; M. Sato^a ; K. Nakamura^a ; M. Numazawa^a ; K. Takeuchi^a ; T. Ohashi^a ; K. Ishikawa^c ; K. Mitsuda^d
• 关键词：X-ray ; Optics ; MEMS ; JUXTA
• 刊名：Advances in Space Research
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：57
• 期：1
• 页码：320-328
• 全文大小：2574 K

文摘

To investigate a feasibility for in situ X-ray imaging spectrometer JUXTA (Jupiter X-ray Telescope Array) onboard a Japanese Jupiter exploration mission, we demonstrated the ideal performances, i.e., angular resolution, effective area and grasp, of our original, conically-approximated Wolter type-I MEMS-processed optics, by extending the previous ray-tracing simulator. The novel simulator enables us to study both on- and off-axis responses for our optics with two-stage optical configurations for the first time. The on-axis angular resolution is restricted to xt stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715006067&_mathId=si1.gif&_user=111111111&_pii=S0273117715006067&_rdoc=1&_issn=02731177&md5=38a4837e9e929cd9248ddf3630d3ab92" title="Click to view the MathML source">∼$\sim$13 μm corresponding to xt stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715006067&_mathId=si1.gif&_user=111111111&_pii=S0273117715006067&_rdoc=1&_issn=02731177&md5=38a4837e9e929cd9248ddf3630d3ab92" title="Click to view the MathML source">∼$\sim$10 arcsec on the detector plane without considering the diffraction effect and dominated by the diffraction effect below xt stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715006067&_mathId=si1.gif&_user=111111111&_pii=S0273117715006067&_rdoc=1&_issn=02731177&md5=38a4837e9e929cd9248ddf3630d3ab92" title="Click to view the MathML source">∼$\sim$1 keV (e.g., 13 arcsec at 1 keV). Si optics can achieve effective area of >700 mm² and grasp of >1600 mm² deg² at our interesting energy of 600 eV. Larger effective area and grasp can be attained by employing Ni as a substrate material or Ir as a reflecting surface material. However, other factors produced in the fabrication processes such as the waviness on the mirror surface and the deformation error cause the significant performance degradation. Thus, we concluded that MEMS-processed optics can satisfy all the requirements of JUXTA only if the manufacturing accuracy can be controlled.