Names are broken down into the standard parts, DeviceType : Area : Position : Attribute
Name | Description |
---|---|
ACCL | Used for everything in the RF system that is part of the general physics and operations interface at the cavity level |
CMOD | Used for everything in the RF system that is part of the general physics and operations interface at the cryomodule level (Gang phase and LEM computations) |
GUN | Used for everything in the gun |
Buncher? | |
PRC/RFS/RES/SSA | Used for engineering diagnostics related to a specific control chassis, such as chassis health monitors. They names correspond to the chassis types: Precision Receiver Chassis, RF Chassis, Resonance Chassis, Solid State Amplifier |
See https://slacspace.slac.stanford.edu/sites/lcls/lcls-2/wd/dsg/Forms/AllItems.aspx, Naming Convention section 6.1.2.2
Area | Physical Location |
---|---|
GUNB | LCLS-II Gun |
L0B | LCLS-II L0 Accelerator Region |
L1B | LCLS-II L1 Accelerator Region |
BC1B | LCLS-II Bunch Compressor 1 |
L2B | LCLS-II L2 Accelerator Region |
BC2B | LCLS-II Bunch Compressor 2 |
L3B | LCLS-II L3 Accelerator Region |
SYS2 | Full LCLS-II Accelerator scope, e.g. global phase offset |
See https://slacspace.slac.stanford.edu/sites/lcls/lcls-2/wd/dsg/Forms/AllItems.aspx, Naming Convention section 6.1.2.3.2
Cryo Module # | Description |
01-35 | CM01-CM35, 1.3GHz cavity |
H1 | 3.9GHz Cryomodule 1, located in L1B and follows CM03 |
H2 | 3.9GHz Cryomodule 2, located in L1B and follows H1 |
Numbering of cavities within a cryomodule:
Name | Description |
---|---|
GDES | Operation Gradient setpoint (MV/m) |
GACT | Measured gradient from cavity probe (MV/m) |
GMAX | Maximum allowable gradient (MV/m) |
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 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 (detrees) |
FDES | Cavity detuning setpoint (Hz) |
FACT | Detune seen by the resonance system (Hz) |
Mode | RF mode (off, pulsed, SEL, GDR) |
RFCTRL | Master enable for an RF cavity (On, Off) \[How to distinguish this from the SSA specific RF enable register?] |
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 |
GTRACE | Gradient waveform from the cavity probe, which is used to calculate GACT (MV/m) |
PTRACE | Phase waveform from the cavity probe, which is used to calculate PACT (degrees) |
GFWDTRACE | Gradient waveform from SSA output (MV/m) |
PFWDTRACE | Phase waveform from SSA output (degrees) |
GREVTRACE | Reverse/reflected SSA output gradient waveform (MV/m) I'm favoring rev over ref because ref sounds to me like "reference" |
PREVTRACE | Reverse/reflected SSA output phase waveform (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) |
Below are signals to discuss added 1/17/2018 Sonya. | |
GTRACE_I | Gradient waveform from the cavity probe, real part |
GTRACE_Q | Gradient waveform from the cavity probe, imaginary part |
GTRACE | Gradient waveform from the cavity probe, amplitude. (GTRACE above) |
PTRACE | Gradient waveform from the cavity probe, phase. (PTRACE above) |
GTRACE_MEAN | Or GMEAN? Mean of GTRACE (may be fed into GACT?) |
PTRACE_MEAN | Or PMEAN? Mean of PTRACE (may be fed into PACT?) |
GTRACE_STD | Or GSTD? Standard deviation of GTRACE |
PTRACE_STD | Or PSTD? Standard deviation of PTRACE |
GTRACE_MIN | Or GMIN? Minimum value of GTRACE |
PTRACE_MIN | Or PMIN? Minimum value of PTRACE |
GTRACE_MAX | Or GMAX? Maximum value of GTRACE |
PTRACE_MAX | Or PMAX? Maximum value of PTRACE |
DTRACE_I | Drive; waveform of RFS chassis drive loopback, real part |
DTRACE_Q | Drive; waveform of RFS chassis drive loopback, imaginary part |
DTRACE_AMPL | Drive; waveform of RFS chassis drive loopback, amplitude |
DTRACE_PHAS | Drive; waveform of RFS chassis drive loopback, phase |
DTRACE_AMPL_MEAN | Or DAMPLMEAN? Mean of DTRACE_AMPL |
DTRACE_PHAS_MEAN | Or DPHASMEAN? Mean of DTRACE_PHAS |
DTRACE_AMPL_STD | Or DAMPLSTD? Standard deviation of DTRACE_AMPL |
DTRACE_PHAS_STD | Or DPHASSTD? Standard deviation of DTRACE_PHAS |
DTRACE_AMPL_MIN | Or DAMPLMIN? Minimum value of DTRACE_AMPL |
DTRACE_PHAS_MIN | Or DPHASMIN? Minimum value of DTRACE_PHAS |
DTRACE_AMPL_MAX | Or DAMPLMAX? Maximum value of DTRACE_AMPL |
DTRACE_PHAS_MAX | Or DPHASMAX? Maximum value of DTRACE_PHAS |
FWDTRACE_I | |
REVTRACE_I | Or REFLTRACE_I |
By default, these should be write-protected during operation
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 | |
Cables and couplers loss, combined with sensor sensitivity, as a scale factor to multiply raw reading by to get MV/m | |
Attenuator value, combined with the above as a multiplier to convert raw to units. Probalby in dB | |
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) | |
Name | Description |
---|---|
VacStat | Vacuum interlock status (Good, Faulted) \[NOTE: Details needed for specifying which vacuum status bit, coupler or beamline] |
TStat | Temperature interlock status (Good, Faulted) \[NOTE: Details needed for specifying which temperature status bit, coupler or stepper.] |
Temperature interlock threhshold | |
V | Chassis power supply voltage |
T | Chassis board temperature |
DC | SSA enable/disable internal DC power |
SSA RF enable, how to distinguish from global RF enable? | |
PzVout | Output voltage to the piezo tuning motor |
PzHz | Expected tuning change from PzVout |
Name | Description |
---|---|
Firmware MD5 | |
BMB7 board serial # | |
Digitizer board serial # | |
Chassis serial # and/or Depot number |