| Name | Description |
---|
| GDES | Operation Gradient setpoint (MV/m) - Possibly deprecate | | GACT | Measured gradient from cavity probe (MV/m) |
| GMAX | Maximum allowable gradient (MV/m) - readback only |
| GCAL | Gradient calibration scale factor, nominally 1. Multiply by this when calculating raw register value to set, so increasing GCAL increases output. |
| ADES | Operation Amplitude setpoint (MV) |
| AACT | Measured amplitude from cavity probe (MV) |
| AMAX | Maximum allowable amplitude (MV) |
| ACAL | Amplitude calibration scale factor, nominally 1. Multiply by this when calculating raw register value to set, so increasing GCAL ACAL increases output. |
| PDES | Operation Phase setpoint (degrees, where 0 is on-crest) |
| PACT | Measured phase from cavity probe (degrees) |
| PREF | a.k.a.gold, phase offset used by LLRF to convert measured phase to one relative to on-crest operation, adjusted by beam phasing (detreesdegrees) |
| DETDESDFDES | Cavity detuning setpoint (Hz) |
| DETACTDFACT | Detune seen by the resonance system (Hz) |
| ModeRFMODECTRL | RF mode control (offSEL, pulsedSELA, SEL, GDR)SELAP) |
| RFMODE | Readback of current RF mode |
| RFCTRLMaster enable for an RF cavity (On, Off) \[How to distinguish this from the SSA specific RF enable register?] | Cavity on/off control. Off = LLRF drive set to 0. (SSA control will be different.) |
| RFReady | Status of RF controls, (Ready, Not Ready) set to ready when control loops are closed and RF is continuous. Or will we ever run with pulsed RF? |
| Quench | Status showing when a cavity quenches, from interlocks (Normal, Quenched) |
| STAT | Status bits in software (define the bits) |
| HSTA | Hardware status |
| GTRACEAWF | Gradient waveform from the cavity probe, which is used to calculate GACT (MV/m) |
| PTRACEPWF | Phase waveform from the cavity probe, which is used to calculate PACT (degrees) |
| *ERRTRACE | Error waveforms corresponding to waveforms above, captured and put in a separate buffer when a fault is detected (degrees or MV/m) |
| | Any of the above in I/Q equivalent of Amplitude/Phase |
| PwrFwd | Forward power from SSA to cavity |
| PwrRev | Reflected/reverse power from cavity |
| PzWF | Waveforms from tuner piezo motors, useful for finding microphonics. Units TBD. |
| ALEM | LEM computed integrated RF amplitude (MV) per cavity and per cryomodule |
| PLEM | LEM computed phase (deg) |
| EGLEM | LEM computed energy gain (MeV) |
| CHLEM | LEM computed chirp (MeV) |
Waveform Signals |
The PVs below will be provided for each waveform signal. Each cavity has the following waveform signals: Description | PV name, <SIG> in following section | Drive | DRV | Forward Power | FWD | Reflected Power | REV | Cavity Probe | CAV | Detune | DET DF | DAC (FPGA internal, input to DAC that drives SSA) | DAC |
|
Waveform | <SIG>:ATRACEAWF | Signal amplitude waveform |
Statistics | <SIG>:AMEAN | Mean of <SIG>:ATRACEAF |
<SIG>:ASTD | Standard deviation of <SIG>:ATRACEAWF |
<SIG>:AMIN | Minimum of <SIG>:ATRACEAF |
<SIG>:AMAX | Maximum of <SIG>:ATRACEAWF |
Waveform | <SIG>:PTRACEPWF | Signal phase waveform |
Statistics | <SIG>:PMEAN | Mean of <SIG>:PTRACEPWF |
<SIG>:PSTD | Standard deviation of <SIG>:PTRACEPWF |
<SIG>:PMIN | Minimum of <SIG>:PTRACEPWF |
<SIG>:PMAX | Maximum of <SIG>:PTRACEPWF |
Waveform | <SIG>:PWRTRACEPWRWF | Signal power waveform |
Statistics | <SIG>:PWRMEAN | Mean of <SIG>:PWRTRACE |
<SIG>:PWRSTD | Standard deviation of <SIG>:PWRTRACEPWRWF |
<SIG>:PWRMIN | Minimum of <SIG>:PWRTRACEPWRWF |
<SIG>:PWRMAX | Maximum of <SIG>:PWRTRACEPWRWF |
Waveform | <SIG>:ITRACEITWF | Signal I waveform |
Waveform | <SIG>:QTRACEQTWF | Signal Q waveform |