Setting up ASTA UED LLRF for 180 Hz operation
ASTA UED derives its timing from LCLS EVG timing system.
LCLS EVG now has a new event code '165' for 180 Hz operation on beamcode 0 for LCLS.
Currently the masks have been setup to exclude time slots 1,3 and 5 with the exclusion mask of 0x15 in Modifier 2.
Thus time slots 2,4 and 6 alone are active.
Each time slot corresponds to 60 Hz. Thus the three active time slots support 3*60Hz = 180 Hz operation.
Please do not change the Event modifier bits. Leave them as they are now:
The VME Master IOC-AS01-RF01 has been modified to looks for the above patterns.
(a) It provides pattern matching in three time slots for 180 Hz operation, instead of two time slots that were originally done for 120 Hz.
(b) Event code 165 has been added to the default set of events and visible in AS01 EVR RF01 Trigger Diags panel as shown below: