| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 70459501 | 2019 | 352 | 00:00 | 2 | 6 | APD realignment. Better center pupil image on APD. Resulted in better timing performance. |
| 70459501 | 2019 | 233 | 00:00 | 2 | 6 | Switch 40 micron APD for best-available 30 micron. Systematic characterization of APD timing performance as function of breakdown voltage and discriminator thresholds was done to determine best performer. |
| 70459501 | 2018 | 131 | 00:00 | 2 | 9 | Cesium clock is now, again, APOLLO timebase. |
| 70459501 | 2017 | 355 | 00:00 | 2 | 9 | XL-DC again is APOLLO timebase. Cesium clock experienced multiple fatal errors, was shipped off for repair. |
| 70459501 | 2017 | 046 | 00:00 | 2 | 9 | Cesium clock is now, again, APOLLO timebase. |
| 70459501 | 2017 | 034 | 00:00 | 2 | 9 | XL-DC again is APOLLO timebase. Reverted to previous hardware state for diagnosing problem with APOLLO system. |
| 70459501 | 2017 | 004 | 00:00 | 2 | 9 | Cesium clock is now APOLLO timebase. |
| 70459501 | 2016 | 043 | 00:00 | 1 | 9 | Began universal counter (UC) clock frequency comparison between cesium and XL-DC. XL-DC still timebase for APOLLO. |
| 70459501 | 2013 | 250 | 00:00 | 0 | 6 | APD readout electronics/motherboard changed. Same APD. |
| 70459501 | 2012 | 098 | 00:00 | 2 | 6 | Began using different gate width. Improved data quality. |
| 70459501 | 2010 | 311 | 00:00 | 2 | 6 | Switch from 30 micron APD to 40 micron |
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