Page History

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Operation phase setpoint (degrees, where 0 is on-crestPDESMeasured phase from cavity probe (degreesPACTSEL_POFFSEL offset setpoint (not used in SELA/GDR mode)SEL_POFF NAMeasured detune frequency (Hz) using state space equation, cavity and forward signals - used to drive piezosDFCavity quench fault, from RFS status

Stepper temperature fault, from Interlock chassis. Current status, latched status, bypass command, bypass status0210STEPTEMPFLTSTEPTEMP_LTCH0210STEPTEMPLTCHSTEPTEMP_BYP 0210STEPTEMPBYPSTEPTEMP_BYP_RBV 0210STEPTEMPBYP_RBVCoupler temperature 1 status

Coupler temperature 2 fault, from Interlock chassis. Current status, latched status, bypass command, bypass status

0210CPLRTEMP2FLTCPLRTEMP2_LTCH0210CPLRTEMP2LTCHCPLRTEMP2_BYP0210CPLRTEMP2BYPCPLRTEMP2_BYP_RBV0210CPLRTEMP2BYP_RBVFPGA PLL lock RFS chassis. Current status, latched status. Cannot be bypassed.

EPICS IOC watchdog fault, from RFS chassis. Current status, latched status, bypass command, bypass status

IOCWDOG_BYP 0210IOCWDOGBYPIOCWDOG_BYP_RBV 0210IOCWDOGBYP_RBV SSA permit fault, from RFS chassis. Current status, latched status, bypass command, bypass status0210SSAFLTSSA_LTCH 0210SSA_LTCH

Coupler vacuum fault, from Interlock chassis. Current status, latched status, bypass command, bypass status

Beamline vacuum fault, from Interlock chassis. Current status, latched status, bypass command, bypass status

Cryo summary fault, from local Cryo PLC. Current status, latched status, bypass command, bypass status

Amplitude feedback proportional gain readback (units not yet determined)AMPFB_GAIN_P_RBV/WGAINPAMPFBGAINP R Amplitude feedback integral gain readback (units not yet determined)AMPFBGAINI_RBV/WGAINIAMPFBGAINI R PHAFBGAINP_RBVAMPFB_GAIN_P_RBV

R/W

Name

Description

SRF Example

(CM 2 Cavity 1)

Gun/Buncher Example

R/W

RFMODECTRL

RF mode control (SEL, SELA, SELAP, SEL Raw, Pulse, Chirp)

ACCL:L1B:0210:RFMODECTRL

N/A

R

RFMODE

Readback of current RF mode (SEL, SELA, SELAP, SEL Raw, Pulse, Chirp, Tone)

ACCL:L1B:0210:RFMODE

R/W

RFCTRL

Cavity on/off control. Off = LLRF drive set to 0. (SSA control will be different.)

ACCL:L1B:0210:RFCTRL

R

RFSTATE

Readback of cavity RF on/off state

ACCL:L1B:0210:RFSTATE

N/A

R

RFREADYFORBEAM

Indicates cavity is in an okay state for beam operation. Possible states:

Ready (numerical 1) = cavity RF is On and mode is SELAP

Not ready (numerical 0) = Ready criteria not met

ACCL:L1B:0210:RFREADYFORBEAM

R/W

ADES

Operation amplitude setpoint (MV)

(For SRF, this setting is used in SEL, SELA, SELAP modes.)

ACCL:L1B:0210:ADES

R/W

ACON

Configuration amplitude (MV)

ACCL:L1B:0210:ACON

W

ACONTODES

Push configuration amplitude value to ADES. To do this, write 1 to ACONTODES

ACCL:L1B:0210:ACONTODES

R

GDES

Gradient setpoint (MV/m) - readback only

ACCL:L1B:0210:GDES

N/A

R

SEL_ASET

SRF amplitude setpoint in SEL Raw, Pulse, Chirp modes. Is in units of % of full drive scale.

ACCL:L1B:0210:AACTSEL_ASET

N/A

R

GACTAACTMEAN

Measured gradient amplitude from cavity probe (MV/m)), averaged over LLRF waveform. Identical to CAV:AMEAN. Typically averaged over ~350 ms, but this can vary depending on waveform settings.

ACCL:L1B:0210:AACTMEAN

R

GACTMEAN

ACCL:L1B:0210:GACT

R/W

GACT

Measured gradient from cavity probe (MV/m), averaged over LLRF waveform. Typically averaged over ~350 ms, but this can vary depending on waveform settings.

ACCL:L1B:0210:GACTGACTMEAN

R/W

AMAXADES_MAX

Maximum allowable amplitude (MV) - experts only). Minimum of SRF, RF, and Ops limits (below).

ACCL:L1B:0210:AMAXADES_MAX

R

GMAX

/W

ADES_MAX_SRF

SRF maximum allowable amplitude, set by SRF experts (MV)Maximum allowable gradient (MV/m) - readback only

ACCL:L1B:0210:GMAXADES_MAX_SRF

R/W

PDES

ADES_MAX_RF

RF maximum allowable amplitude, set by RF experts (MV)

ACCL:L1B:0210:

ADES_MAX_RF

R

PACT

/W

ADES_MAX_OPS

Ops maximum allowable amplitude, set by Operations experts (MV)

ACCL:L1B:0210:

ADES_MAX_OPS

R/W

PREF

PACTMEAN

Measured phase from cavity probe (degrees), averaged over LLRF waveform. Identical to CAV:PMEAN. Typically averaged over ~350 ms, but this can vary depending on waveform settings.a.k.a.gold, phase offset used by LLRF to convert measured phase to one relative to on-crest operation, adjusted by beam phasing (degrees)

ACCL:L1B:0210:PREFPACTMEAN

R/W

PDES

Operation phase

setpoint (degrees, where 0 is on-crest by convention). Range -180 to 180.

ACCL:L1B:0210:

PDES

R/

W

R

SEL_POFF_RBV

PCON

Configuration phase (degrees

SEL phase offset (not used in SELA/GDR mode

)

ACCL:L1B:0210:SEL_POFF_RBV

N/A

R

DFACT

Measured etune frequency (Hz)

N/A

R

DF

ACON

W

PCONTODES

Push configuration phase value to PDES. To do this, write 1 to PCONTODES

ACCL:L1B:0210:PCONTODES

R/W

CKP

Cavity needs to be phased with respect to beam. Phasing program should set this to 0 when phasing is complete. It is set to 1 automatically when someone accepts a new Phase Reference Line offset.

Okay (numerical 0)

Check phase (numerical 1) - cavity needs to be phased

ACCL:L1B:0210:

CKP

N/A

R

DFVALID

Measured detune frequency (Hz) using state space equation, cavity and forward signals is valid. If it is not valid, its value cannot be used and the resonance system will not automatically change the piezo setting. In order for it to be valid, there must be sufficient cavity signal and it must be within +/- a couple hundred Hz.

ACCL:L1B:0210:DFVALID

N/A

R

DF_FC

Measured detune frequency (Hz) using frequency counter method - not used in resonance control, larger operating range than DF

ACCL:L1B:0210:DF_FC

N/A

R

CHIRP:DF

Measured detune frequency (Hz) using chirp method - only active in Chirp and Pulsed modes, primarily for use when cavity is many kHz out of tune, operating range of tens of kHz or more

ACCL:L1B:0210:CHIRP:DF

N/A

R/W

ALEM

LEM computed integrated RF amplitude (MV) per cavity and per cryomodule

ACCL:L1B:0210:ALEM

R/W

PLEM

LEM computed phase (deg)

ACCL:L1B:0210:PLEM

R/W

EGLEM

LEM computed energy gain (MeV)

ACCL:L1B:0210:EGLEM

R/W

CHLEM

LEM computed chirp (MeV)

ACCL:L1B:0210:CHLEM

R/W

CAV:FUDG

Beam-based scale factor applied to cavity probe amplitude readback. Nominal value of 1.

ACCL:L1B:0210:CAV:FUDG

R

L

Cavity design length - constant

ACCL:L1B:0210:L

N/A

R

FREQ

Cavity design frequency - constant

ACCL:L1B:0210:FREQ

N/A

R

IMPED

Cavity design shunt impedance - constant

ACCL:L1B:0210:IMPED

N/A

Tentative

STAT

Status bits in software (define the bits)

CKPSUM

Alarm status for: cavity needs to be phased with respect to beam. Takes into account whether cavity is parked.

Okay (numerical 0)

Check phase (numerical 2)

ACCL:L1B:0210:CKPSUM

W

GOLD_PDES

'Golds' PDES. It will cause PREF to be updated and leave PDES at zero. How to use:

Find maximum energy by adjusting PDES
Set GOLD_PDES to 1

Doing so will cause:

a. PREF to be set to (PREF-PDES)

b. PDES will then be set to 0

ACCL:L1B:0210:GOLD_PDES

R/W

PREF

Do not set PREF directly. Instead, use GOLD_PDES above.

Phase offset (degrees) used by LLRF to convert measured phase to one relative to on-crest operation, adjusted by (gold) beam phasing. Recommend not setting PREF directly, but using GOLD_PDES (above).

PREF is subtracted from PDES before writing phase to hardware. PREF is added to the raw phase readback from hardware.

ACCL:L1B:0210:PREF

R/W

PTOF

Phase offset (degrees) used to adjust for changes in beam time-of-arrival, in particular for changes in bunch compressor path length. Unlike PREF, changing PTOF will immediately change the cavity phase.

PTOF is subtracted from PDES before writing phase to hardware. PTOF is added to the raw phase readback from hardware.

ACCL:L1B:0210:PTOF

R/W

SEL_POFF

SEL phase offset setpoint

ACCL:L1B:0210:SEL_POFF

N/A

R

SEL_POFF_RBV

SEL phase offset readback

ACCL:L1B:0210:SEL_POFF_RBV

N/A

R

DFACT

Measured detune frequency (Hz)

N/A

R

DF

Measured detune frequency (Hz) using state space equation, cavity and forward signals - used to drive piezos

ACCL:L1B:0210:DF

N/A

R

DFVALID

Measured detune frequency (Hz) using state space equation, cavity and forward signals is valid. If it is not valid, its value cannot be used and the resonance system will not automatically change the piezo setting. In order for it to be valid, there must be sufficient cavity signal and it must be within +/- a couple hundred Hz.

ACCL:L1B:0210:DFVALID

N/A

R

DF_FC

Measured detune frequency (Hz) using frequency counter method - not used in resonance control, larger operating range than DF

ACCL:L1B:0210:DF_FC

N/A

R

CHIRP:DF

Measured detune frequency (Hz) using chirp method - only active in Chirp and Pulsed modes, primarily for use when cavity is many kHz out of tune, operating range of tens of kHz or more

ACCL:L1B:0210:CHIRP:DF

N/A

R/W

ALEM

LEM computed integrated RF amplitude (MV) per cavity and per cryomodule

ACCL:L1B:0210:ALEM

R/W

PLEM

LEM computed phase (deg)

ACCL:L1B:0210:PLEM

R/W

EGLEM

LEM computed energy gain (MeV)

ACCL:L1B:0210:EGLEM

R/W

CHLEM

LEM computed chirp (MeV)

ACCL:L1B:0210:CHLEM

R/W

CAV:FUDGE

Beam-based scale factor applied to cavity probe amplitude readback. Nominal value of 1.

CAV:SCALE = cavity_preliminary_scaling * CAV:FUDGE

CAV:SCALE is applied at the waveform level and so FUDGE is included in scalars like AACT, CAV:AMEAN, CAV:AMIN, CAV:AMAX, etc. and waveforms like CAV:IWF, CAV:QWF, CAV:AWF, etc.

Example:

Cavity ADES and AACTMEAN are 10 MV, but measured energy gain is 11 MV.

Set CAV:FUDGE to 1.1.

This will cause the RF drive level to be adjusted by 1/1.1

new_drive = original_drive / 1.1

and the cavity amplitude readback to be adjusted by 1.1.

ACCL:L1B:0210:CAV:FUDGE

R

L

Cavity design length - constant

ACCL:L1B:0210:L

N/A

R

FREQ

Cavity design frequency - constant

ACCL:L1B:0210:FREQ

N/A

R

IMPED

Cavity design shunt impedance - constant

ACCL:L1B:0210:IMPED

N/A

R

PWRDISS

Cavity dissipated power (W). Calculated by LLRF from Q0 and cavity amplitude. Sent by LLRF to cryo controls.

ACCL:L1B:0210:PWRDISS

R

Q0

Cavity Q0 (unitless), including user fudge factor. This is the value used by HaLO, LLRF calculation of dissipated power, etc. Formula: Q0 = Q0:MEAS * Q0:FUDGE

ACCL:L1B:0210:Q0

R/W

Q0:MEAS

Last measured cavity Q0 (unitless)

ACCL:L1B:0210:Q0:MEAS

R/W

Q0:FUDGE

Cavity Q0 fudge factor (unitless). Nominal value of 1. Can be used to adjust Q0 if suspect actual Q0 is not Q0:MEAS, for example due to recent quench.

ACCL:L1B:0210:Q0:FUDGE

SRF Interlocks - Per Cavity

W

INTLK_RESET_ALL

Reset all latched faults from RFS and Resonance/Interlock chassis

ACCL:L1B:0210:INTLK_RESET_ALL

R

RFS:INTLK_FIRST

Bit mask indicating which interlock fault was first detected by RFS.

ACCL:L1B:0210:RFS:INTLK_FIRST

N/A

R

RFS:FLTINTLK_FIRST

For last captured fault waveform, bit mask indicating which interlock fault was first detected by RFS

ACCL:L1B:0210:RFS:FLTINTLK_FIRST

N/A

R

QUENCH_FLT

Cavity quench fault, from RFS chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:QUENCH_FLT

R

QUENCH_LTCH

ACCL:L1B:0210:QUENCH_LTCH

W

QUENCH_BYP

ACCL:L1B:0210:QUENCH_BYP

R

QUENCH_BYP_RBV

ACCL:L1B:0210:QUENCH_BYP_RBV

R

QUENCH_CNTT

ACCL:L1B:0210:QUENCH_CNTT

R

QUENCH_CNTY

ACCL:L1B:0210:QUENCH_CNTY

R

QUENCH_CNT

ACCL:L1B:0210:QUENCH_CNT

R

QUENCH_CNTU

ACCL:L1B:0210:QUENCH_CNTU

R

STEPTEMP_FLT

Stepper temperature fault, from Interlock chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:STEPTEMP_FLT

R

STEPTEMP_LTCH

ACCL:L1B:0210:STEPTEMP_LTCH

W

STEPTEMP_BYP

ACCL:L1B:0210:STEPTEMP_BYP

R

STEPTEMP_BYP_RBV

ACCL:L1B:0210:STEPTEMP_BYP_RBV

R

STEPTEMP_CNTT

ACCL:L1B:0210:STEPTEMP_CNTT

R

STEPTEMP_CNTY

ACCL:L1B:0210:STEPTEMP_CNTY

R

STEPTEMP_CNT

ACCL:L1B:0210:STEPTEMP_CNT

R

STEPTEMP_CNTU

ACCL:L1B:0210:STEPTEMP_CNTU

R

CPLRTEMP1_FLT

Coupler temperature 1 fault, from Interlock chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:CPLRTEMP1_FLT

R

CPLRTEMP1_LTCH

ACCL:L1B:0210:CPLRTEMP1_LTCH

W

CPLRTEMP1_BYP

ACCL:L1B:0210:CPLRTEMP1_BYP

R

CPLRTEMP1_BYP_RBV

ACCL:L1B:0210:CPLRTEMP1_BYP_RBV

R

CPLRTEMP1_CNTT

ACCL:L1B:0210:CPLRTEMP1_CNTT

R

CPLRTEMP1_CNTY

ACCL:L1B:0210:CPLRTEMP1_CNTY

R

CPLRTEMP1_CNT

ACCL:L1B:0210:CPLRTEMP1_CNT

R

CPLRTEMP1_CNTU

ACCL:L1B:0210:CPLRTEMP1_CNTU

R

CPLRTEMP2_FLT

Coupler temperature 2 fault, from Interlock chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:CPLRTEMP2_FLT

R

CPLRTEMP2_LTCH

ACCL:L1B:0210:CPLRTEMP2_LTCH

W

CPLRTEMP2_BYP

ACCL:L1B:0210:CPLRTEMP2_BYP

R

CPLRTEMP2_BYP_RBV

ACCL:L1B:0210:CPLRTEMP2_BYP_RBV

R

CPLRTEMP2_CNTT

ACCL:L1B:0210:CPLRTEMP2_CNTT

R

CPLRTEMP2_CNTY

ACCL:L1B:0210:CPLRTEMP2_CNTY

R

CPLRTEMP2_CNT

ACCL:L1B:0210:CPLRTEMP2_CNT

R

CPLRTEMP2_CNTU

ACCL:L1B:0210:CPLRTEMP2_CNTU

R

PLL_FLT

FPGA PLL lock fault, from RFS chassis. Current status, latched status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults. Cannot be bypassed.

ACCL:L1B:0210:PLL_FLT

R

PLL_LTCH

ACCL:L1B:0210:PLL_LTCH

R

PLL_CNTT

ACCL:L1B:0210:PLL_CNTT

R

PLL_CNTY

ACCL:L1B:0210:PLL_CNTY

R

PLL_CNT

ACCL:L1B:0210:PLL_CNT

R

PLL_CNTU

ACCL:L1B:0210:PLL_CNTU

R

IOCWDOG_FLT

EPICS IOC watchdog fault, from RFS chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:IOCWDOG_FLT

R

IOCWDOG_LTCH

ACCL:L1B:0210:IOCWDOG_FLT

W

IOCWDOG_BYP

ACCL:L1B:0210:IOCWDOG_BYP

R

IOCWDOG_BYP_RBV

ACCL:L1B:0210:IOCWDOG_BYP_RBV

R

IOCWDOG_CNTT

ACCL:L1B:0210:IOCWDOG_CNTT

R

IOCWDOG_CNTY

ACCL:L1B:0210:IOCWDOG_CNTY

R

IOCWDOG_CNT

ACCL:L1B:0210:IOCWDOG_CNT

R

IOCWDOG_CNTU

ACCL:L1B:0210:IOCWDOG_CNTT

R

SSA_FLT

SSA permit fault, from RFS chassis. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:0210:SSA_FLT

R

SSA_LTCH

ACCL:L1B:0210:SSA_LTCH

W

SSA_BYP

ACCL:L1B:0210:SSA_BYP

R

SSA_BYP_RBV

ACCL:L1B:0210:SSA_BYP_RBV

R

SSA_CNTT

ACCL:L1B:0210:SSA_CNTT

R

SSA_CNTY

ACCL:L1B:0210:SSA_CNTY

R

SSA_CNT

ACCL:L1B:0210:SSA_CNT

R

SSA_CNTU

ACCL:L1B:0210:SSA_CNTU

SRF Interlocks - Per Rack (A or B)

R

CPLRVAC[A,B]_FLT

Coupler vacuum fault, from Interlock

HSTA

Hardware status

SRF Interlocks - Per Cavity

W

INTLK_RESET_ALL

Reset all latched faults from RFS and Resonance/Interlock chassis

ACCL:L1B:0210:INTLK_RESET_ALL

R

RFS:INTLK_FIRST

Bit mask indicating which interlock fault was first detected by RFS.

ACCL:L1B:0210:RFS:INTLK_FIRST

N/A

R

RFS:FLTINTLK_FIRST

For last captured fault waveform, bit mask indicating which interlock fault was first detected by RFS

ACCL:L1B:0210:RFS:FLTINTLK_FIRST

N/A

R

QUENCH_FLT

chassis. Current status, latched status, bypass command, bypass

status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:02100200:QUENCHCPLRVACA_FLT

R

QUENCHCPLRVAC[A,B]_LTCH

ACCL:L1B:02100200:QUENCHCPLRVACA_LTCH

W

QUENCH_BYPCPLRVAC[A,B]_BYP

ACCL:L1B:02100200:QUENCHCPLRVACA_BYP

R

QUENCHCPLRVAC[A,B]_BYP_RBVRBV

ACCL:L1B:02100200:QUENCHCPLRVACA_BYP_RBV

R

STEPTEMP_FLT

CPLRVAC[A,B]_CNTT

ACCL:L1B:

0200:

CPLRVACA_

R

CNTT

R

CPLRVAC[A,B]_CNTY

ACCL:L1B:

0200:

CPLRVACA_

CNTY

W

R

CPLRVAC[A,B]_CNT

ACCL:L1B:

0200:

CPLRVACA_

CNT

R

CPLRVAC[A,B]_CNTU

ACCL:L1B:

0200:

CPLRVACA_

CNTU

R

CPLRTEMP1BMLNVAC[A,B]_FLT

Beamline vacuum fault, from Interlock chassis. Current status, latched status, bypass command, bypass

status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:02100200:CPLRTEMP1BMLNVACA_FLT

R

CPLRTEMP1BMLNVAC[A,B]_LTCH

ACCL:L1B:02100200:CPLRTEMP1BMLNVACA_LTCH

W

CPLRTEMP1BMLNVAC[A,B]_BYP

ACCL:L1B:02100200:CPLRTEMP1BMLNVACA_BYPBYP

R

CPLRTEMP1BMLNVAC[A,B]_BYP_RBV

ACCL:L1B:02100200:CPLRTEMP1BMLNVACA_BYP_RBV

R

CPLRTEMP2_FLT

BMLNVAC[A,B]_CNTT

ACCL:L1B:

0200:

BMLNVACA_

CNTT

R

BMLNVAC[A,B]_CNTY

ACCL:L1B:

0200:

BMLNVACA_

CNTY

W

R

BMLNVAC[A,B]_CNT

ACCL:L1B:

0200:

BMLNVACA_

CNT

R

BMLNVAC[A,B]_CNTU

ACCL:L1B:

0200:

BMLNVACA_

CNTU

R

PLLCRYOSUM[A,B]_FLT

Cryo summary fault, from

local Cryo PLC. Current status, latched status, bypass command, bypass status, counts of today's faults, yesterday's faults, total faults, a resettable counter's faults.

ACCL:L1B:02100200:PLLCRYOSUMA_FLT

R

PLL_LTCH CRYOSUM[A,B]_LTCH

ACCL:L1B:02100200:PLLCRYOSUMA_LTCH

R

IOCWDOG_FLT

W

CRYOSUM[A,B]_BYP

ACCL:L1B:02100200:IOCWDOGCRYOSUMA_FLTBYP

R

CRYOSUM[A,B]_BYP_RBV

R

IOCWDOG_LTCH

ACCL:L1B:02100200:IOCWDOGCRYOSUMA_BYP_FLTRBV

W

R

CRYOSUM[A,B]_CNTT

ACCL:L1B:

0200:

CRYOSUMA_

CNTT

R

CRYOSUM[A,B]_CNTY

ACCL:L1B:

0200:

CRYOSUMA_

CNTY

R

SSA_FLT

CRYOSUM[A,B]_CNT

ACCL:L1B:

0200:

CRYOSUMA_

CNT

R

CRYOSUM[A,B]_CNTU

ACCL:L1B:

0200:

W

SSA_BYP

ACCL:L1B:0210:SSA_BYP

R

SSA_BYP_RBV

ACCL:L1B:0210:SSA_BYP_RBV

SRF Interlocks - Per Rack (A or B)

R

CPLRVAC[A,B]_FLT

ACCL:L1B:0200:CPLRVACA_FLT

R

CPLRVAC[A,B]_LTCH

ACCL:L1B:0200:CPLRVACA_LTCH

W

CPLRVAC[A,B]_BYP

ACCL:L1B:0200:CPLRVACA_BYP

R

CPLRVAC[A,B]_BYP_RBV

ACCL:L1B:0200:CPLRVACA_BYP_RBV

R

BMLNVAC[A,B]_FLT

ACCL:L1B:0200:BMLNVACA_FLT

R

BMLNVAC[A,B]_LTCH

ACCL:L1B:0200:BMLNVACA_LTCH

W

BMLNVAC[A,B]_BYP

ACCL:L1B:0200:BMLNVACA_BYP

R

BMLNVAC[A,B]_BYP_RBV

ACCL:L1B:0200:BMLNVACA_BYP_RBV

R

CRYOSUM[A,B]_FLT

ACCL:L1B:0200:CRYOSUMA_FLT

R

CRYOSUM[A,B]_LTCH

ACCL:L1B:0200:CRYOSUMA_LTCH

W

CRYOSUM[A,B]_BYP

ACCL:L1B:0200:CRYOSUMA_BYP

R

CRYOSUM[A,B]_BYP_RBV

ACCL:L1B:0200:CRYOSUMA_BYP_RBV

SRF Interlocks - Per Cryomodule - Tentative

R

CRYOSUM_FLT

Cryo summary status from local Cryo PLC. Current status

ACCL:L1B:0200:CRYOSUM_FLT

R

HELEVEL_FLT

Cryo Helium level status from local Cryo PLC. Current status

ACCL:L1B:0200:HELEVEL_FLT

R

HEPRES_FLT

Cryo Helium pressure status from local Cryo PLC. Current status

ACCL:L1B:0200:HEPRES_FLT

R

CRYOHEARTBEAT_FLT

Cryo PLC heartbeat fault. Generated by RF software when cryo data stops updating or updates too slowly

ACCL:L1B:0200:CRYOPLC_HEARTBEAT

SRF Cavity Characterization and Expert Settings

R

QLOADED

Loaded Q

ACCL:L1B:0210:QLOADED

R

LDCOEF

Lorentz detuning coefficient

ACCL:L1B:0210:LDCOEF

R

BCOEFM

State space B coefficient magnitude

ACCL:L1B:0210:BCOEFM

R

BCOEFP

State space B coefficient phase

ACCL:L1B:0210:BCOEFP

R

SSA:SLOPE

SSA curve parameter - slope

ACCL:L1B:0210:SSA:SLOPE

R

SSA:PED

SSA curve parameter - pedestal

ACCL:L1B:0210:SSA:PED

R

SSA:MINX

SSA curve parameter - min x

ACCL:L1B:0210:SSA:MINX

R

SSA:MAXR

Maximum drive to SSA, range 0 to 1. (Need better name.)

ACCL:L1B:0210:QLOADED

CRYOSUMA_CNTU

SRF Interlocks - Per Cryomodule - Tentative

R

CRYOSUM_FLT

Cryo summary status from local Cryo PLC. Current status

ACCL:L1B:0200:CRYOSUM_FLT

R

HELEVEL_FLT

Cryo Helium level status from local Cryo PLC. Current status

ACCL:L1B:0200:HELEVEL_FLT

R

HEPRES_FLT

Cryo Helium pressure status from local Cryo PLC. Current status

ACCL:L1B:0200:HEPRES_FLT

R

CRYOHEARTBEAT_FLT

Cryo PLC heartbeat fault. Generated by RF software when cryo data stops updating or updates too slowly

ACCL:L1B:0200:CRYOPLC_HEARTBEAT

SRF Cavity Characterization and Expert Settings

R

QLOADED

Loaded Q

ACCL:L1B:0210:QLOADED

R

LDCOEF

Lorentz detuning coefficient

ACCL:L1B:0210:LDCOEF

R

BCOEFM

State space B coefficient magnitude

ACCL:L1B:0210:BCOEFM

R

BCOEFP

State space B coefficient phase

ACCL:L1B:0210:BCOEFP

R

SSA:SLOPE

SSA curve parameter - slope

ACCL:L1B:0210:SSA:SLOPE

R

SSA:PED

SSA curve parameter - pedestal

ACCL:L1B:0210:SSA:PED

R

SSA:MINX

SSA curve parameter - min x

ACCL:L1B:0210:SSA:MINX

R

SSA:DRV_MAX

Maximum drive to SSA, range 0 to 1. Do not change this directly. It is set by SSA calibration script.

ACCL:L1B:0210:DRV_MAX

Waveform Signals

Each SRF cavity has the following waveform signals:

Description	PV name, <SIG> in following section	Amplitude Units	Power Units	Phase Units
Forward Power	FWD	sqrt(W)	W	degrees
Reverse/Reflected Power	REV	sqrt(W)	W	degrees
Cavity Probe	CAV	MV	mW	degrees
DAC (FPGA internal, input to DAC that drives SSA)	DAC	% of full DAC scale	(% of full DAC scale)^2	degrees
Detune (see below)	DF	Hz	N/A	N/A
Drive (RFS chassis loopback) - waveform disabled by default	DRV	sqrt(W)	W	degrees

For SRF systems, these PVs are provided for CAV, FWD, REV, DAC (and DRV only during expert diagnostics/troubleshooting.) Example PVs are for CAV.

R

<SIG>:AWF

Signal amplitude waveform

ACCL:L1B:0210:CAV:AWF

R

<SIG>:AMEAN

Mean of <SIG>:AWF

ACCL:L1B:0210:CAV:AMEAN

R

<SIG>:ASTD

Standard deviation of <SIG>:AWF

ACCL:L1B:0210:CAV:ASTD

R

<SIG>:ARSTD

Standard deviation of <SIG>:AWF divided by mean of <SIG>:AWF

ACCL:L1B:0210:CAV:ARSTD

R

<SIG>:AMIN

Minimum of <SIG>:AWF

ACCL:L1B:0210:CAV:AMIN

R

<SIG>:AMAX

Maximum of <SIG>:AWF

ACCL:L1B:0210:CAV:AWF

R

<SIG>:PWF

Signal phase waveform

ACCL:L1B:0210:CAV:PWF

R

<SIG>:PMEAN

Mean of <SIG>:PWF

ACCL:L1B:0210:CAV:PMEAN

R

<SIG>:PSTD

Standard deviation of <SIG>:PWF

ACCL:L1B:0210:CAV:PSTD

R

<SIG>:PRSTD

Standard deviation of <SIG>:PWF divided by mean of <SIG>:PWF

ACCL:L1B:0210:CAV:PRSTD

R

<SIG>:PMIN

Minimum of <SIG>:PWF

ACCL:L1B:0210:CAV:PMIN

R

<SIG>:PMAX

Maximum of <SIG>:PWF

ACCL:L1B:0210:CAV:PMAX

R

<SIG>:PWRWF

Signal power waveform

ACCL:L1B:0210:CAV:PWRWF

R

<SIG>:PWRMEAN

Mean of <SIG>:PWRWF

ACCL:L1B:0210:CAV:PWRMEAN

R

<SIG>:PWRSTD

Standard deviation of <SIG>:PWRWF

ACCL:L1B:0210:CAV:PWRSTD

R

<SIG>:PWRRSTD

Standard deviation of <SIG>:PWRWF divided by mean of <SIG>:PWRWF

ACCL:L1B:0210:CAV:PWRRSTD

R

<SIG>:PWRMIN

Minimum of <SIG>:PWRWF

Waveform Signals

Each SRF cavity has the following waveform signals:

Description	PV name, <SIG> in following section	Amplitude Units	Power Units	Phase
Drive (RFS chassis loopback)	DRV	sqrt(W)	W	degrees
Forward Power	FWD	sqrt(W)	W	degrees
Reverse/Reflected Power	REV	sqrt(W)	W	degrees
Cavity Probe	CAV	MV	mW	degrees
DAC (FPGA internal, input to DAC that drives SSA)	DAC	% of full DAC scale	(% of full DAC scale)^2	degrees
Detune (see below)	DF	Hz	N/A	N/A

For SRF systems, these PVs are provided for CAV, FWD, REV, DAC (and DRV only during expert diagnostics/troubleshooting.) Example PVs are for CAV.

R

<SIG>:AWF

Signal amplitude waveform

ACCL:L1B:0210:CAV:AWFPWRMIN

R

<SIG>:AMEANPWRMAX

Maximum of <SIG>:PWRWF Mean of <SIG>:AWF

ACCL:L1B:0210:CAV:AMEANPWRMAX

R

<SIG>:ASTDIWF

Signal I waveform Standard deviation of <SIG>:AWF

ACCL:L1B:0210:CAV:ASTDIWF

RR

<SIG>:ARSTDQWF

Signal Q waveform Standard deviation of <SIG>:AWF divided by mean of <SIG>:AWF

ACCL:L1B:0210:CAV:ARSTD AWF

R

<SIG>:AMINFLTAWF

Fault waveform - signal amplitude Minimum of <SIG>:AWF

ACCL:L1B:0210:CAV:AMINFLTAWF

R

<SIG>:AMAXFLTPWF

Fault waveform - signal phase Maximum of <SIG>:AWF

ACCL:L1B:0210:CAV:AWF

R

<SIG>:PWF

:CAV:FLTPWF

Other SRF Waveform Signals:

R

DF:WF

Detune frequency waveform. Calculated by software from cavity and forward signals. [Hz] Signal phase waveform

ACCL:L1B:0210:CAVDF:PWFWF

RR

<SIG>DF:PMEANMEAN

Mean of <SIG>Mean of DF:PWFWF

ACCL:L1B:0210:CAVDF:PMEAN MEAN

R

<SIG>DF:PSTDSTD

Standard Standard deviation of <SIG>of DF:PWFWF

ACCL:L1B:0210:CAVDF:PSTD STD

R R

<SIG>DF:PRSTDMIN

Minimum of DF:WF Standard deviation of <SIG>:PWF divided by mean of <SIG>:PWF

ACCL:L1B:0210:CAVDF:PRSTD MIN

RR

<SIG>DF:PMINMAX

Minimum of <SIG>Maximum of DF:PWFWF

ACCL:L1B:0210:CAVDF:PMINMAX

R

<SIG>BW:PMAXWF

Cavity bandwidth waveform. Calculated by software from cavity and forward signals. [Hz] Maximum of <SIG>:PWF

ACCL:L1B:0210:CAVBW:PMAXWF

R

<SIG>CTRL:PWRWFIWF

P/I Controller Output I waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1] Signal power waveform

ACCL:L1B:0210:CAVCTRL:PWRWFIWF

RR

<SIG>CTRL:PWRMEANQWF

P/I Controller Output Q waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1] Mean of <SIG>:PWRWF

ACCL:L1B:0210:CAVCTRL:PWRMEANQWF

RR

<SIG>CTRL:PWRSTDAWF

P/I Controller Output amplitude waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1] Standard deviation of <SIG>:PWRWF

ACCL:L1B:0210:CAVCTRL:PWRSTD AWF

R

<SIG>CTRL:PWRRSTDFLTAWF

Fault waveform - P/I Controller Output amplitude Standard deviation of <SIG>:PWRWF divided by mean of <SIG>:PWRWF

ACCL:L1B:0210:CAVCTRL:PWRRSTDFLTAWF

R

<SIG>CTRL:PWRMINFLTPWF

Fault waveform - P/I Controller Output phase Minimum of <SIG>:PWRWF

ACCL:L1B:0210:CAVCTRL:PWRMINFLTPWF

R

<SIG>:PWRMAX

/W

ACQ_FLT_DELAY

Fault data trigger control. In % of total waveform data duration. 0% = all data is pre-fault, 100% = all data is post-fault Maximum of <SIG>:PWRWF

ACCL:L1B:0210:CAV:PWRMAX

R

<SIG>:IWF

Signal I waveform

ACCL:L1B:0210:CAV:IWF

ACQ_FLT_DELAY

Feedback

R

AMPFB_GAIN_P_RBV

Amplitude feedback proportional gain readback (units not yet determined)

R

<SIG>:QWF

Signal Q waveform

ACCL:L1B:0210:CAV:AWFAMPFB_GAIN_P_RBV

R

<SIG>:FLTAWF

/W

AMPFB_GAIN_P

Amplitude feedback proportional gain setting (units not yet determined) Fault waveform - signal amplitude

ACCL:L1B:0210:CAV:FLTAWF

R

<SIG>:FLTPWF

AMPFB_GAIN_P

R

AMPFB_GAIN_I_RBV

Amplitude feedback integral gain readback (units not yet determined) Fault waveform - signal phase

ACCL:L1B:0210:CAV:FLTPWF

Other SRF Waveform Signals:

AMPFB_GAIN_I_RBV

R/W

AMPFB_GAIN_I

Amplitude feedback integral gain setting (units not yet determined)

R

DF:WF

Detune frequency waveform. Calculated by software from cavity and forward signals. [Hz]

ACCL:L1B:0210:DF:WFAMPFB_GAIN_I

R

PHAFB_GAIN_P_RBV

Phase feedback proportional gain readback (units not yet determined)

R

DF:MEAN

Mean of DF:WF

ACCL:L1B:0210:DF:MEANAMPFB_GAIN_P_RBV

R

DF:STD

/W

PHAFB_GAIN_P

Phase feedback proportional gain setting (units not yet determined)Standard deviation of DF:WF

ACCL:L1B:0210:DF:STD

R

DF:MIN

AMPFB_GAIN_P

R

PHAFB_GAIN_I_RBV

Phase feedback integral gain readback (units not yet determined)Minimum of DF:WF

ACCL:L1B:0210:DF:MIN

R

DF:MAX

AMPFB_GAIN_I_RBV

R/W

PHAFB_GAIN_I

Phase feedback integral gain setting (units not yet determined)Maximum of DF:WF

ACCL:L1B:0210:DF:MAX AMPFB_GAIN_I

R

AMPFB_LSUM

Amplitude feedback is at lower limit while feedback is active. 0 if true (alarm state), 1 if false (good state)

R

BW:WF

Cavity bandwidth waveform. Calculated by software from cavity and forward signals. [Hz]

ACCL:L1B:0210:BW:WF AMPFB_LSUM

R

AMPFB_HSUM

Amplitude feedback is at upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)

R

CTRL:IWF

P/I Controller Output I waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1]

ACCL:L1B:0210:CTRL:IWF AMPFB_HSUM

R

CTRL:QWF

AMPFB_SUM

Amplitude feedback is at either lower or upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)P/I Controller Output Q waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1]

ACCL:L1B:0210:CTRL:QWF AMPFB_SUM

R

CTRL:AWF

P/I Controller Output amplitude waveform. Calculated by software from cavity and DAC signals. [% of full scale, range -1 to 1]

ACCL:L1B:0210:CTRL:AWF

PHAFB_LSUM

Phase feedback is at lower limit while feedback is active. 0 if true (alarm state), 1 if false (good state)

R

CTRL:FLTAWF

Fault waveform - P/I Controller Output amplitude

ACCL:L1B:0210:CTRL:FLTAWF

R

CTRL:FLTPWF

PHAFB_LSUM

R

PHAFB_HSUM

Phase feedback is at upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state) Fault waveform - P/I Controller Output phase

ACCL:L1B:0210:CTRL:FLTPWFPHAFB_HSUM

R/W

ACQPHAFB_FLT_DELAYSUM

Phase feedback is at either lower or upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)Fault data trigger control. In % of total waveform data duration. 0% = all data is pre-fault, 100% = all data is post-fault

ACCL:L1B:0210:ACQPHAFB_FLT_DELAYSUM

Feedback

R

FB_SUM

Amplitude or phase feedback is at either lower or upper limit while RFREADYFORBEAM is active. 0 if true (alarm state), 1 if false (good state). This summary's counts of today's faults, yesterday's faults, total faults, a resettable counter faults.

R

AMPFB_GAIN_P_RBV

ACCL:L1B:0210:

FB_SUM

R

AMPFB

FB_

SUM_

CNTT

Amplitude feedback proportional gain setting (units not yet determined)

ACCL:L1B:0210:

FB_

SUM_

CNTT

R

AMPFB_GAIN_I_RBV

FB_SUM_CNTY

ACCL:L1B:0210:

FB_

SUM_

CNTY

R

AMPFB

FB_

SUM_

CNT

Amplitude feedback integral gain setting (units not yet determined)

ACCL:L1B:0210:

FB_

SUM_

CNT

R

FB_

SUM_

CNTU

Phase feedback proportional gain readback (units not yet determined)

ACCL:L1B:0210:

FB_SUM_CNTU

Resonance control

Name

DescriptionDescription

SRF Example

(CM2 Cavity 1)SRF Example

Gun/Buncher Example

R/W

PHAFB_GAIN_P Phase feedback proportional gain setting (units not yet determined)

STEP:NSTEPS

Stepper tuner number of steps per move

ACCL

:L1B:0210

:AMPFB_GAIN_P R PHAFB_GAIN_I_RBV Phase feedback integral gain readback (units not yet determined)ACCL:L1B:0210:AMPFB_GAIN_I_RBVR/W PHAFB_GAIN_I Phase feedback integral gain setting (units not yet determined)ACCL:L1B:0210:AMPFB_GAIN_I R AMPFB_LSUM Amplitude feedback is at lower limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:AMPFB_LSUM R AMPFB_HSUM Amplitude feedback is at upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:AMPFB_HSUM R AMPFB_SUM Amplitude feedback is at either lower or upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:AMPFB_SUM R PHAFB_LSUM Phase feedback is at lower limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:PHAFB_LSUM R PHAFB_HSUM Phase feedback is at upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:PHAFB_HSUM RPHAFB_SUMPhase feedback is at either lower or upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:PHAFB_SUMRFB_SUMAmplitude or phase feedback is at either lower or upper limit while feedback is active. 0 if true (alarm state), 1 if false (good state)ACCL:L1B:0210:FB_SUM

Resonance control

...

SRF Example

(CM2 Cavity 1)SRF Example

...

:STEP:NSTEPS
W	STEP:MOV_REQ_NEG	Request stepper tuner move negative STEP:NSTEPS. Write 1 to request	ACCL:L1B:0210:STEP:MOV_REQ_NEG
W	STEP:MOV_REQ_POS	Request stepper tuner move positive STEP:NSTEPS. Write 1 to request	ACCL:L1B:0210:STEP:MOV_REQ_POS
R	STEP:STATWRD	Stepper controller status word readback	ACCL:L1B:0210:STEP:STATWRD
R	STEP:STATWRD.B0	Stepper controller status bit: motor moving; 1 = moving, 0 = not	ACCL:L1B:0210:STEP:STATWRD.B0
R	STEP:STATWRD.B2	Stepper controller status bit: motor done; 1 = done, 0 = not	ACCL:L1B:0210:STEP:STATWRD.B2
R	STEP:STATWRD.B3	Stepper controller status bit: at limit B; 1 = at limit, 0 = not. (The limit should never be reached.)	ACCL:L1B:0210:STEP:STATWRD.B3
R	STEP:STATWRD.B4	Stepper controller status bit: at limit A; 1 = at limit, 0 = not. (The limit should never be reached.)	ACCL:L1B:0210:STEP:STATWRD.B4
R	STEP:CTRLWRD	Stepper controller status word readback	ACCL:L1B:0210:STEP:CTRLWRD
R	STEP:CTRLWRD.B5	Stepper controller status bit: move direction; 1 if negative, 0 if positive	ACCL:L1B:0210:STEP:STATWRD.B0
R	STEP:STATMSG	High-level status message from stepper controller software	ACCL:L1B:0210:STEP:STATMSG
W	PZT:ENABLE	Piezo enable/disable control; set to 1 to enable, 0 to disable	ACCL:L1B:0210:PZT:ENABLE
R	PZT:ENABLESTAT	Piezo enable/disable status; 1 = enabled, 0 = disabled	ACCL:L1B:0210:PZT:ENABLESTAT
W	PZT:MODECTRL	Piezo mode control; set to 1 for Integrator (feedback driven by RFS measured detune), 0 for DC control. Integrator is the correct mode for normal operations.	ACCL:L1B:0210:PZT:MODECTRL
R	PZT:MODESTAT	Piezo mode status; 1 = Integrator, 0 = DC	ACCL:L1B:0210:PZT:MODESTAT
R	PZT:V	Calculated piezo voltage	ACCL:L1B:0210:PZT:V
R	PZT:DF_RFS	Detune measurement sent from RFS to Resonance chassis. This drives the piezo while in Integrator mode.	ACCL:L1B:0210:PZT:DF_RFS
R	PZT:DFVALID_RFS	Detune measurement sent from RFS to Resonance chassis is valid. If it is not valid, the Integrator will not change the piezo setting	ACCL:L1B:0210:PZT:DFVALID_RFS
R/W	PZT:DAC_SP	DC voltage offset setting. Only used while in DC mode.	ACCL:L1B:0210:PZT:DAC_SP
R/W	PZT:INTEG_SP	Optional Integrator setpoint. Can be used to compensate for observed systematic detune offset while in Integrator mode.	ACCL:L1B:0210:PZT:INTEG_SP
R	PZT:INTEG_SP_RBV	Readback of optional Integrator setpoint.	ACCL:L1B:0210:PZT:INTEG_SP_RBV
R/W	PZT:BIAS	Piezo bias voltage setting. Nominally 25 V. Used to operate piezo away from range limits. This should not change during normal operations.	ACCL:L1B:0210:PZT:BIAS
R	PZT:BIAS_RBV	Readback of piezo bias voltage setting.	ACCL:L1B:0210:PZT:BIAS_RBV
R	PZT:INTEG_AT_LIM	Piezo integrator (feedback) is at a limit of its range. This may require moving the stepper to re-center the piezo.	ACCL:L1B:0210:PZT:INTEG_AT_LIM

Deployment and calibration attributes

By default, these should be write-protected during operation

	Name	Description	SRF Example (CM 2 Cavity 1)	Gun/Buncher Example
R	AT:GMAX	During acceptance testing, maximum gradient. [MV/m]	ACCL:L1B:0210:AT:GMAX	N/A
R	AT:AMAX	During acceptance testing, maximum amplitude. [MV]	ACCL:L1B:0210:AT:AMAX	N/A
R	AT:GUSE	During acceptance testing, usable gradient. [MV/m]	ACCL:L1B:0210:AT:GUSE	N/A
R	AT:AUSE	During acceptance testing, usable amplitude. [MV]	ACCL:L1B:0210:AT:AUSE	N/A
R	AT:FEON_GACT	During acceptance testing, gradient at which field emission begins. [MV/m]	ACCL:L1B:0210:AT:FEON_GACT	N/A
R	AT:FEON_AACT	During acceptance testing, amplitude at which field emission begins. [MV]	ACCL:L1B:0210:AT:FEON_AACT	N/A
R	AT:LIMIT	During acceptance testing, cavity limiting factor. 0 = Undefined, 1 = Quench, 2 = FE, 3 = SSA trip, 4 = Admin, 5 = RF power, 6 = Other	ACCL:L1B:0210:AT:LIMIT	N/A
R	AT:Q0	During acceptance testing, cavity Q0 measured at 16 MV/m	ACCL:L1B:0210:AT:Q0	N/A
R	AT:QPROBE	During acceptance testing, cavity probe Q external, cold	ACCL:L1B:0210:AT:QPROBE	N/A
R	AT:QHOM_CPLR	During acceptance testing, Higher Order Mode coupler Q external, cold	ACCL:L1B:0210:AT:QHOM_CPLR	N/A
R	AT:QHOM_PICKUP	During acceptance testing, Higher Order Mode pickup Q external, cold	ACCL:L1B:0210:AT:QHOM_PICKUP	N/A

...

Piezo mode control; set to 1 for Integrator (feedback driven by RFS measured detune), 0 for DC control.

Integrator is the correct mode for normal operations.

...

Detune measurement sent from RFS to Resonance chassis is valid. If it is not valid, the Integrator

will not change the piezo setting

...

Piezo bias voltage setting. Nominally 25 V. Used to operate piezo away from range limits.

This should not change during normal operations.

...

Readback of piezo bias voltage setting.

...

Piezo integrator (feedback) is at a limit of its range. This may require moving the stepper to re-center the piezo.

...

Deployment and calibration attributes

By default, these should be write-protected during operation

Gun/Buncher Example Qext

Name	Description	SRF Example (CM 2 Cavity 1)
		(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 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
Per Cryomodule
R	SN	Cryomodule serial number	ACCL:L1B:0200:SN	N/A
Signal calibration. For SRF cavities, the PVs below are provided for CAV, FWD, REV, DRV signals. The SRF PV name examples below use CAV.
Measured values
R/W	<SIG>:CAL_ADC_10DBM	ADC counts at 10 dBm. EPICS software uses this to calculate RF power at full scale.	ACCL:L1B:0210:CAV:CAL_ADC_10DBM
R/W	<SIG>:CAL_LOSS_CABLE	Measured cable losses used in signal calibration. Positive value in dB.	ACCL:L1B:0210:CAV:CAL_LOSS_CABLE
R/W	<SIG>:CAL_LOSS_CPLR	Measured coupler loss used in signal calibration. Positive value in dB.	ACCL:L1B:0210:CAV:CAL_LOSS_CPLR
R/W	<SIG>:CAL_LOSS_ATTEN	Fixed attenuator used in signal calibration. Positive value in dB.	ACCL:L1B:0210:CAV:CAL_LOSS_ATTEN
R/W	<SIG>:CAL_LOSS_OTHER	Unattributed measured loss used in signal calibration. Positive value in dB.	ACCL:L1B:0210:CAV:CAL_LOSS_OTHER
EPICS-calculated values
R	<SIG>:CAL_REF_PWR	RF power at ADC full scale. [dBm]	ACCL:L1B:0210:CAV:CAL_REF_PWR
R	<SIG>:CAL_LOSS_TOTAL	Total (of cable, coupler, atten, other) loss used in signal calibration. Positive value in dB.	ACCL:L1B:0210:CAV:CAL_LOSS_TOTAL
R	<SIG>:SCALE	Final calibration scale factor to convert raw ADC counts to amplitude. This also include the beam-based fudge factor	ACCL:L1B:0210:CAV:SCALE
For SRF, the signal calibration for Cavity Probe (CAV) can be calculated 2 ways: (1) using the above system losses, power at ADC full scale, and cavity probe Q or (2) calculated from the reverse signal decay. Experts can choose which method they would like to use per cavity
R/W	CAVSCALE_SEL	Select between calibration methods: 0 = Qprobe, 1 = RevCal	ACCL:L1B:0210:CAVSCALE_SEL
R/W	QPROBE	Cavity probe Q. Used in Qprobe calibration method.	ACCL:L1B:0210:QPROBE

Other attributes for operations -

...

Tentative

Name	Description
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

...

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Resonance control

Resonance control

Deployment and calibration attributes

Deployment and calibration attributes

Other attributes for operations -

Tentative