From Event: SPIE Optical Engineering + Applications, 2017
X-ray lobster optics provide a unique way to focus X-rays onto a small focal plane imager with wide field of view imaging. Such an instrument with angular resolution of a few arcminutes can be used to study GRB afterglows, as well as the variability and spectroscopic characteristics for other astrophysical objects. At Penn state University, we characterize these lobster optics with an H1RG CMOS sensor (100 μm thick Silicon with 18 μm pixel size), procured from Teledyne Imaging Sensors at its focal plane. The light-weight compact lobster optic with a 25 cm focal length provides two dimensional imaging with ~25 cm^2 effective area at 2 keV. We chose the hybrid CMOS detector (HCD) since X-ray HCDs offer several advantages (e.g. radiation hard, low power, faster and flexible readout rate) over CCDs for future X-ray missions. We utilize 47 m long X-ray beam line at Penn state University to do our experiments where we characterize the overall effective area of the instrument at 1.5 - 8 keV for both on-axis and off-axis angles. In this presentation, we will describe the characterization test stand and methods, as well as the detailed results. We perform ray-tracing simulations to theoretically validate the results which would also be briefly discussed here. While this is simply a proof-of-concept experiment, such an instrument with significant collecting area can be explored for future rocket or CubeSat experiments.
Tanmoy Chattopadhyay, Mitchell Wages, David Burrows, Evan Bray, Adolf Inneman, Rene Hudec, Veronika Stehlikova, David Schendt, Sam Hull, Abe Falcone, and Maria Mcquaide, "Characterization of x-ray lobster optics with a hybrid CMOS sensor (Conference Presentation)," Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103991P (Presented at SPIE Optical Engineering + Applications: August 10, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2274647.5581285430001.
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