Difference: CE7XRS (2 vs. 3)

Revision 32019-08-05 - PengWenxi

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CE-7 X-ray Spectrometer 搭载方案

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  1)4个KETEK SDD或Amptek SDD,总有效面积为1cm2,低能段效率受铍窗或薄窗的吸收影响;
2)采用背照式CMOS(10um硅有效厚度),单路有效面积5cm2,4路就可达到20cm2,1~2keV对于测量Mg,Al,Si比较有利;
但6~7keV,效率只有0.2,相当于0.4cm2,不如SDD。另外,能量分辨大约200eV@5.9keV,要差于SDD。
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3)采用背照式CCD(E2V),目前状态不清楚,不过需要工作在-40~-60℃低温下,制冷是个问题;
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3)采用背照式CCD (*E2V),目前状态不清楚,不过需要工作在-40~-60℃低温下,制冷是个问题;
 

2.编码孔型

如采用类似于REXIS的设计,CCD面积为24cm2,码板占空比0.5,视场27.6°,角分辨0.5°,成像模式需要相对较大耀斑发生,准直模式相当于12cm2;
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CCD同样有制冷问题,如用CMOS,则还是存在效率问题;
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同样有制冷问题,如用CMOS,则还是存在效率问题;
 

3.聚焦型

聚焦型适合对局部区域实现超高分辨的探测,例如100km轨道高度,实现~0.1km的分辨,但是需要较大耀斑的情况:

1)考虑采用LIGA Micro-Slot Optics镜子(张天冲),对于小面积SDD探测器(30mm2),基本只有0.1度的视场范围,1keV的有效面积也只有2~3 cm2 (口径10cm*10cm,焦距25cm) ,几何因子太小。
参考:Small satellites with MEMS x-ray telescopes for x-ray astronomy and solar system exploration

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2) 考虑采用miniature X-ray optics (MiXO),替代传统很重的NiCo shell镜子,角分辨<1’ over ~1 deg2, 50 cm focal length, ~25 cm2 on–axis effective area at 1 keV
参考: Miniature Lightweight X-ray Optics (MiXO) and CubeSat X-ray Telescope (CubeX) for Solar System Exploration.
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2) 考虑采用miniature X-ray optics (*MiXO ),替代传统很重的NiCo shell镜子,角分辨<1’ over ~1 deg2, 50 cm focal length, ~25 cm2 on–axis effective area at 1 keV
参考: Miniature Lightweight X-ray Optics and Cubesat X-ray Telescope for Solar System Exploration.
 

4. 国际合作

 
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