Sequencer and Bunch Control
- Michael Abbott
This screen is used to control the sequencer and the associated bunch configurations.
Sequencer
This view of the sequencer shows the configuration for state #1. For a complete view of the sequencer see Sequencer Setup, where all 7 states can be configured and the behaviour of each field is described.
Bunch Bank
This section shows a summary of the setup of each of the four available bunch control banks and provides links to the Bunch Bank Control screen where each bank can be reconfigured. For each bank the following information is shown (each PV prefixed with $(device):$(axis) and n running from 0 to 3).
| Title | PV | Description |
|---|---|---|
| FIR select | :BUN:n:FIRWF:STA | Summary of FIR configuration |
| DAC out status | :BUN:n:STATUS | Summary of selected DAC output configuration |
For each monitored waveform the status report shows one of three things depending on whether individual bunches are have different configurations:
- If all bunches have the same configuration, a summary of that configuration is shown, eg "Sweep"
- If one bunch is different, but all the others are the same then the common configuration is shown followed by the unique configuration and bunch position, for example "FIR (Sw+FIR @100)" indicates a DAC output configuration with feedback on all bunches, and sequencer sweep on bunch 100 only.
- Otherwise the phrase "Mixed FIR", "Mixed outputs", "Mixed gains" is shown as appropriate.
Below the bank selection are three PVs that help with copying bank configurations:
| Name | PV | Description |
|---|---|---|
:BUN:COPY_FROM_S | Selects which of the four banks is to be copied. | |
| Copy Bank | :BUN:COPY_BANK_S | Copies the entire bank configuration state (FIR selection and all five source gains and enables waveforms) from the selected source to the selected destination bank. |
:BUN:COPY_TO_S | Selects which of the four banks is to be overwritten by the "Copy Bank" action. |
NCOs
This allows the two fixed frequency oscillators to be controlled. The following PVs are available, each prefixed with $(device):$(axis):$(nco) where $(nco) is either NCO1 or NCO2.
| Name | PV | Description |
|---|---|---|
| Frequency | :FREQ_S | The NCO frequency can be set to any value in units of cycles per machine revolution. |
| Gain | :GAIN_DB_S | This shows the configured output gain in dB with 0dB representing full scale DAC output. Clicking on this will bring up the NCO Gain Configuration where the gain can be adjusted. |
| Enable | :ENABLE_S | This must be set to "On" for NCO output to be generated. |
| Track PLL | :TUNE_PLL_S | If this is set to "Follow" then the generated frequency will be adjusted by the :PLL:NCO:OFFSET as managed on the Tune PLL screen. |