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| Name | Description | |
|---|---|---|
| (from Chris Adolfsen. Garth wonders should this be a calibration attribute rather than physics interface?) Slow tuner start-up position prior to rf turn on - with the piezo voltages zeroed, the cavity would be tuned close to 1.3 GHz after the operating gradient is established - thus the initial detuning with rf off relative to 1.3 GHz is K*(operating gradient)^2 | ||
| (from Chris Adolfsen. Garth wonders should this be a calibration attribute rather than physics interface?) Slow tuner park position - this is the position the tuner would be set if one wants to detune the cavity so it does not interact with the beam. | ||
| Q0 | Q0 measurement from partner labs, delivered with the cryomodule | |
| Qext | Qext measured in-situ (last measurement – used to calibrate cavity probe signal based on discharge power) | |
| LFD | Lorentz Force Detuning K factor(Hz/(MV/m)^2) measured in-situ | |
| Calibration of the slow tuner (Hz/step) measured in-situ | ||
| Calibration of the piezo tuners (Hz/volt) measured in-situ | ||
| Signal calibration. The PVs below will be provided for FWD, REV, DRV signals. | ||
| Measured values | ||
| <SIG>:CAL_ADC_10DBM | ADC counts at 10 dBm. EPICS software uses this to calculate RF power at full scale. | |
| <SIG>:CAL_LOSS_CABLE | Measured cable losses for forward measurement used in signal calibration. Positive value in dB. | |
| <SIG>:CAL_LOSS_CPLR | Measured coupler loss for forward measurement used in signal calibration. Positive value in dB. | |
| <SIG>:CAL_LOSS_ATTEN | Fixed attenuator for forward measurement used in signal calibration. Positive value in dB. | |
| <SIG>:CAL_LOSS_OTHER | Unattributed measured loss for forward measurement used loss used in signal calibration. Positive value in dB. <SIG>:CAL_LOSS_TOTAL | Total loss for forward measurement used in signal calibration. Positive value in dB. |
| EPICS-calculated values | ||
| <SIG>:CAL_REF_PWR | RF power at ADC full scale for forward measurement. In dBm. Analogous PVs exist for reverse and drive (aka loopback) signals. | |
| <SIG>:CAL_LOSS_TOTAL | Total loss for forward measurement (of cable, coupler, atten, other) loss used in signal calibration. Positive value in dB. | |
| <SIG>:SCALE | Calibration scale factor to convert forward raw ADC counts to amplitude in sqrt(Watts). Calculated internally by RF software, based on system losses and ADC power at full scale. | |
| Signal calibration for Cavity Probe (CAV) | ||
| CAV:CAL_SCALE | Calibration scale factor to convert cavity probe raw ADC counts to amplitude in MV. Calculated by LLRF calibration sequence. See CAV:SCALE for more info. | |
| CAV:SCALE | Calibration scale factor to convert cavity probe raw ADC counts to amplitude in MV. Is equal to product of CAV:CAL_SCALE and beam-based FUDG scale factor. | |
| Chassis and ADC scale factor, or polynomial coefficients. From lab measurements of chassis to convert ADC units to physics units | ||
| PI(no D) loop parameters for amplitude and phase loops. Maybe PKp, PKi, GKp, GKi | ||
| Open loop amplitude and phase DAC settings | ||
| Control loop status (open, closed) | ||
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