Help for Longitudinal Feedbacks
WARNING: The controls on this screen perform INVASIVE operations.
This Help screen applies to all Longitudinal Feedbacks currently operating; there are seven feedback configured up through BC2. The longitudinal feedbacks adjust the phase and / or amplitude of the L0B RF, L1S RF,and L2 24-1 and 24-2 phases, in order to maintain the desired energy and / or bunchlength at different points along the beamline. The DL2 Energy portion is not yet operational.
The desired Energy and Bunchlength values (State Setpoints) are set by the operator on this screen.
This screen is arranged in three sections.
SECTION ONE: Longitudinal Feedback Control
This section, across the top of the display, is a duplicate of the controls on the Feedback Control display, and they work the same way. It contains the controls as one line item for the associated longitudinal feedback. Please see the Help... for the Feedback Control display for a description of these indicators and control buttons.
SECTION TWO: Feedback Detail Graphic
This middle Section shows a graphic of the position of the devices used in the associated Feedback application. The device name is a button which brings up the related device display. There is a square of color that indicates whether the device is currently used in the Feedback. Green means it is in-use, Grey means it is not used. If it is Red or Yellow, then the device or state is in a warning or error condition. See the tabular display below to see if the device or state is operating near or outside of its limits.
SECTION THREE: Tabular Data Display
This section shows a table of the lower limit, current value, and upper limit of measurements collected for the associated Feedback, and the calculated States and actuator values. When the feedback is on the current values will update continuously. If a device or state is operating near its limits, or out-of-range, the current value will be highlighted with a corresponding yellow or red box around it.
There are six inputs available in the section for the operator. The operator may change these setpoints 'on-the-fly', the feedback will read the new setpoint on the next iteration. The setpoints are:
DL1 Energy: The desired Energy for Dog Leg 1, in MeV.
BC1 Energy: The desired Energy at Bunch Compressor 1, in MeV.
BC1 Bunchlength: The desired Bunchlength after Bunch Compressor 1, in percent???
BC2 Energy: The desired Energy at Bunch Compressor 2, in MeV.
BC2 Bunchlength: The desired Bunchlength after Bunch Compressor 2, in percent???
DL2 Energy: The desired Energy for Dog Leg 2, in MeV.(not yet available)
Graphs... button
This button brings up a display that contains continuously updating graphs of the Measurements, States, and Actuators for this feedback.