Introduction
The EVent Generator (EVG) has the task of generating signals that coordinate many pieces of the control system to do what is wanted on each of 360 pulses per second. Typically there are several types of things we can do on a pulse like, nothing, send beam to the LCLS electron dump, send beam to end station A. Each of these things happens on different pulses. Each has a rate (e.g. 60 Hz) at which it happens and that rate can be quickly changed by operator actions or hardware inputs from operator buttons, the beam containment system or the machine protection system.
This GUI allows the user to define patterns (also known as modifier bits) that are used to execute the above. These modifier bits are then used in other places to decide on e.g. whether to trigger a device or read a BPM. This GUI is not used for day-to-day control. Rather it is used a few times per run to define the rates at which various beams can be run.
The GUI is divided into five tabs. We will cover them one-by-one.
Define Modifiers
On each pulse blah blah blah...