Segment lists are used to figure out which time segments were good for the detector. These should be considered output files to prevent redundant downloading when unpacking an archived job. Since they are necessary for any work involving a jobspec file anyway, you want to know whether they are there, and it is thus important to list their status when the -o flag is given. It is also therefore important to include them in the archive, so that later data analysis can be performed offline.
Used the wrong channel: H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_2
is incorrect for LHO Cesium; use
H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_1 instead.
... you are analyzing H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_2, which is NTP comparator channel and not the atomic clock. That's why your offset as well as linear drift is very small. Real atomic clock comparison should look like the LLO data. The correct channel to analyze is H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_1. ... A minor point related to the above is that the diagnostic channel plots like https://dcc.ligo.org/DocDB/0145/T1700441/001/G297595- diagnostic-channel-plot-comparison.pdf should include corner station comparator A channels like L1:SYS-TIMING_C_PPS_A_SIGNAL_1_DIFF both for LLO and LHO. Corner station comparator B channels are not connected to anything. ...
Start downloading the missing channel on my data download server.
Finished, less than 24 hours for a single channel.
Explanation here. Explanation here. Explanation here.Do this using os.path.realpath for all cases.
Also back up files to research/archive/slow-channel-dumps.
This took way too long and made way too many zoom plots. It also forced the downloading of thousands of files and more than doubled storage used. This is because the LHO Cesium clock was outside of the default anomaly window for most of the run. Just about every anomaly was a plain old outlier.
Adding a new TODO item to fix this now.
To be honest, a good amount of this was already done in another branch.
Fortunately there were no faults. Only a spurious missing time at hanford segment 218, as with the other channels.
No longer need to say that LHO’s superior performance is worth investigating because apparently it isn’t superior after all. Somewhat better calibrated, but not qualitatively so. Similar order of magnitude drift.
Waiting on Zsuzsa’s okay.
Add a line about double checking with people on site.
First of all, put in first line that get in touch with Keith and Dave at the sites to make sure that no cables were switched...