Abstract
Abstract
We designed a flight model of the wide field X-ray imager on board the microsat
KOYOH, referred to as T-LEX, and investigated its imaging performance
through laboratory beam tests. T-LEX employs the coded mask method, wherein
the aperture pattern of the mask was selected and fabricated from 50,000 patterns
using a Monte Carlo approach. Utilizing the obtained mask along with a silicon
strip detector, we examined the angular response by varying the incident
angle with a stage during X-ray irradiation. The resulting angular response
exhibited deviations from the design values, yet it confirmed that the targeted
position accuracy of 15 arcminutes is maintained across a range from -20deg to
+20deg with the best fit calibrated model.