The tables below give a description of the various parameters used in a typical DRAGON analysis. The “Branch Name” corresponds to the branch name in the ROOT trees generated by mid2root. Note that the more raw parameters, for example raw ADC/TDC/VME module data (v792.*, etc.), are not listed here but are still avaliable in the default ROOT trees.

Head (Gamma-Ray) Event (t1 Tree)

Branch Name Description
head Head (gamma-ray) singles
head.header MIDAS header informnation
head.header.fEventId MIDAS event ID
head.header.fTriggerMask MIDAS trigger mask
head.header.fSerialNumber MIDAS event serial number
head.header.fTimeStamp MIDAS event timestamp in seconds (from computer clock)
head.header.fDataSize Size in bytes of the MIDAS event
head.bgo BGO data
head.bgo.ecal[30] Calibrated BGO energies, by detector number
head.bgo.tcal[30] Calibrated BGO TDC measurements
head.bgo.esort[30] Calibrated BGO energies, sorted in order of highest -> lowest
head.bgo.sum Energy sum of all valid BGO hits
head.bgo.hit0 Index of the BGO w/ the highest energy deposition
head.bgo.x0 x-position of the BGO w/ the highest energy deposition
head.bgo.y0 y-position of the BGO w/ the highest energy deposition
head.bgo.z0 z-position of the BGO w/ the highest energy deposition
head.bgo.t0 TDC measurement of the BGO w/ the highest energy deposition
tcal0 TDC measurement of the BGO channel which produced the trigger
tcalx TDC measurement of the “crossover” (heavy-ion trigger) signal
tcal_rf TDC measurement of the gated RF signal

Head (Gamma-Ray) Scaler Event (t2 Tree)

Branch Name Description
sch Head (gamma-ray) scaler measurements
sch.count[17] Number of counts in a particular scaler reading (~1 sec), by channel number
sch.sum[17] Sum of counts over the current run, by channel number
sch.rate[17] Count rate (counts / time) in a particular scaler reading, by channel number

Tail (heavy-ion) Event (t3 Tree)

Branch Name Description
tail Tail (heavy-ion) singles
tail.header MIDAS header informnation
tail.header.fEventId MIDAS event ID
tail.header.fTriggerMask MIDAS trigger mask
tail.header.fSerialNumber MIDAS event serial number
tail.header.fTimeStamp MIDAS event timestamp in seconds (from computer clock)
tail.header.fDataSize Size in bytes of the MIDAS event
tail.dsssd DSSSD measurements
tail.dsssd.ecal[32] Calibrated DSSSD energies, by channel number
tail.dsssd.efront Calibrated energy of the front strip w/ the most energy deposition
tail.dsssd.eback Calibrated energy of the back strip w/ the most energy deposition
tail.dsssd.hit_front Index of the front strip w/ the most energy deposition
tail.dsssd.hit_back Index of the back strip w/ the most energy deposition
tail.dsssd.tfront TDC measurement of the front strip trigger (OR of all front strip signals)
tail.dsssd.tback TDC measurement of the back strip trigger (OR of all front strip signals)
tail.ic Ion chamber measurements
tail.ic.anode[5] IC Anode signals (energy deposition), by channel
tail.ic.tcal[4] IC anode TDC measurements, by channel
tail.ic.sum Sum of all valid anode signals (total energy deposited)
tail.nai Sodium iodide auxillary detector measurements
tail.nai.ecal[2] Calibrated energy signals, by detector
tail.ge HPGs auxillary detector measurements
tail.ge.ecal Calibrated energy signal
tail.mcp MCP measurements
tail.mcp.anode[4] Anode signals on MCP0, by channel number
tail.mcp.tcal[2] TDC measurement for each MCP (tcal[0] == MCP0, tcal[1] == MCP1)
tail.mcp.esum Sum of all valid anode signals
tail.mcp.tac MCP TAC signal
tail.mcp.x x position at MCP0, from relative anode signal sized
tail.mcp.y y position at MCP0, from relative anode signal sized
tail.sb Surface barrier measurements
tail.sb.ecal[2] Calibrated energy signals, by detector number
tail.tof Time of flight between various heavy-ion detectors, calculated by subtracting relevant TDC measurements.
tail.tof.mcp TOF from MCP0 -> MCP1
tail.tof.mcp_dsssd TOF from MCP0 -> DSSSD
tail.tof.mcp_ic TOF from MCP0 -> IC
tail.tcal_rf TDC measurement of the gated RF signal
tail.tcal0 TDC measurement of the signal which made the tail trigger
tail.tcalx TDC measurement of the “crossover” (head trigger) signal

Tail (Gamma-Ray) Scaler Event (t4 Tree)

Branch Name Description
sch Tail (gamma-ray) scaler measurements
sch.count[17] Number of counts in a particular scaler reading (~1 sec), by channel number
sch.sum[17] Sum of counts over the current run, by channel number
sch.rate[17] Count rate (counts / time) in a particular scaler reading, by channel number

Coincidence Event (t5 Tree)

Branch Name Description
coinc Coincidence event
coinc.head Head data, see singles parameters for sub-branches
coinc.tail Tail data, see singles parameters for sub-branches
coinc.xtrig Time difference between head trigger and tail trigger, in uSec; measured by the IO32 timestamp counter.
coinc.xtofh Time difference between head trigger and tail trigger, measured by the head TDC
coinc.xtoft Time difference between head trigger and tail trigger, measured by the tail TDC

EPICS Event (t20 Tree)

Branch Name Description
epics EPICS event
epics.header MIDAS header informnation
epics.header.fEventId MIDAS event ID
epics.header.fTriggerMask MIDAS trigger mask
epics.header.fSerialNumber MIDAS event serial number
epics.header.fTimeStamp MIDAS event timestamp in seconds (from computer clock)
epics.header.fDataSize Size in bytes of the MIDAS event
epics.ch Channel number of the EPICS recording
epics.val Measurement value of the EPICS recording