The calculation of total dose using SPENVIS

The potential radiation dose for the Solar-B EIS CCDs was discussed in reference [1], and the potential effect of that radiation dose was discussed in reference [2]. Whilst the effect of ionising radiation on CCD areas such as flat band voltage shifts was not a cause for concern (although the transient effects on image quality may be) there was a potential problem with the effect of Non-Ionising Radiation damage on the CCD’s Charge Transfer Inefficiency (CTI). Consequently, it was recommended that an operating temperature of around -80°C or so may be necessary to ensure adequate CTI. However, subsequent thermal studies have shown that such a low temperature may be difficult to reach.