CCD236 is a new generation swept charge device (SCD) developed by e2v. It is designed for the Low Energy Telescope (LE) onboard the Hard X-ray Modulation Telescope (HXMT). The spectrum of the detector is a convolution result of the incident spectrum and the energy response of the detector. One can obtain accurate quantities of incident spectrum by fitting the model spectrum with the energy response. According to the two-dimensional interpolation method, an energy response matrix of CCD236 is generated using the calibration data obtained by the low X-ray calibration facility located at Institute of High Energy Physics. The accuracy of interpolation is better than 0.2 eV, and the full width at half maximum (FWHM) variation trend with energy of the RSP agrees well with that of the calibration data. After that, a double-gaussian model of Fe-55 source was convoluted with the energy response matrix. The result shows that the fitting residual is controlled within 3σ after considering a systematic error of 0.1%. The deviation of full-energy peak is less than 10 eV. The RSP can well characterize the response of CCD236 detector in the observable energy region.

CCD236是e2v开发的新一代扫掠电荷器件（SCD）。它专为硬 X 射线调制望远镜 (HXMT) 上的低能望远镜 (LE) 而设计。探测器的光谱是入射光谱和探测器能量响应的卷积结果。通过将模型光谱与能量响应进行拟合，可以获得准确数量的入射光谱。根据二维插值法，利用高能物理研究所低X射线校准设备获得的校准数据生成CCD236的能量响应矩阵。插值精度优于0.2 eV，RSP的半峰全宽（FWHM）随能量变化趋势与标定数据吻合较好。在那之后，Fe-55 源的双高斯模型与能量响应矩阵进行卷积。结果表明，考虑到0.1%的系统误差，拟合残差控制在3σ以内。全能峰偏差小于10 eV。RSP可以很好地表征CCD236探测器在可观测能量区的响应。