Bunch pattern SA1 / SA3

SQS requests to change the bunch pattern.
Currently SA1/SA3 run interleaved as 131313...
The first bunch in the train (for SA1, non-lasing in SA3) nevertheless is visible as a small pre-peak in the diode signal which SQS uses to check the timing.
Therefore SQS requests to change to 31313131....

It was checked with SA1 (SPB/SFX) and the accelerator experts that this should not cause any issues (AGIPD detector is running on dynamic trigger),
therefore it was agreed that SPB/SFX informs BKR when there is a good moment without data acquisition, and BKR will make this change after informing SQS.
This change will happen within the next hour (as of 15h20).