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EVIO Data Format

Table of Contents
minLevel2

Overview

EVIO (Event IO) is the raw data format used by the DAQ event builder.  The structure of an EVIO file is a tree of banks, each of which has a header and a data payload. 

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Parent banktagtag hexNameNotes
event type 17170x11PrestartOnly bank in pre-start event
event type 18180x12GoOnly bank in go event
event type 311290x81EpicsEpics mother bank
|-576180xe112Epics headerEpics header bank
|-576200xe114Epics stringEpics string bank - contains the epics data in one long string of value-key pairs.
 576210xe115ScalersScaler banks
  0xe101  
Physics event>128bit 7 setPhysics 
|-491520xc000Event ID 
|-37,39,46,580x25,0x27,0x2e,0x3a 

 

Crate NameContentsTagTag Hex
hps11SSP, ECal Bottom Disc/TDCs/Scalers, RF FADC460x2e
hps12ECal Top & RF Disc/TDCs/Scalers580x3a

hps1

ECal Top FADC37

0x25

hps2ECal Bottom FADC, Faraday Cup Disc/Scalers390x27

Prestart Bank

IndexPrestart bank0x11 (17)
0start timeunix timestamp
1run number 
2file number 

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Epics nameMeaningNotes
MBSY2C_energyBeam energy according to Hall B BSY dipole "bus" 
ARCx:p
Beam energy measured in Arc "x" ; e.g. ARC2:p
x=12...9A
PSPECIRBCKPair Spectrometer Current Readback 
HPS:LS450_2:FIELDFrascati probe field 
HPS:LS450_1:FIELDPair Spectrometer probe field 
MTIRBCKFrascati Current Readback 
VCG2C212C21 Vacuum gauge pressure 
VCG2C21A2C21A Vacuum gauge pressure 
VCG2C24A2C24A Vacuum gauge pressure 
VCG2H00A2H00 Vacuum gauge pressure 
VCG2H01A2H01 Vacuum gauge pressure 
VCG2H02A2H02 Vacuum gauge pressure 
scaler_calc1Faraday cup current 
scalerS12bHPS-Left beam halo count 
scalerS13bHPS-Right beam halo count 
scalerS14bHPS-Top beam halo count 
scalerS15bHPS-SC beam halo count 
hallb_IPM2C21A_XPOSBeam position X at 2C21 
hallb_IPM2C21A_YPOSBeam position Y at 2C21 
hallb_IPM2C21A_CURCurrent at 2C21 
hallb_IPM2C24A_XPOSBeam position X at 2C24 
hallb_IPM2C24A_YPOSBeam position Y at 2C24 
hallb_IPM2C24A_CURCurrent at 2C24 
hallb_IPM2H00_XPOSBeam position X at 2H00 
hallb_IPM2H00_YPOSBeam position Y at 2H00 
hallb_IPM2H00_CURCurrent at 2H00 
hallb_IPM2H02_YPOSBeam position X at 2H02 
hallb_IPM2H02_XPOSBeam position Y at 2H02 

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