List and Meaning of Data Variables

This page is to accumulate the knowledge on the data variables of E906 and E1039. The similar information accumulated during E906 can be found on the UMich E906 TWiki page; http://twiki.npl.illinois.edu/bin/view/E906/TableStructure . That should be imported to this page time-by-time.

The data structure is definded as C++ classes in the following repositories. You are expected to look into them to find a complete list of the variables. The table below shows the specific class/function for each type of data.

	Repository	Event	Detector Hit	Beam	Scaler
E1039	e1039-core/interface_main	SQEvent	SQHitVector	n/a	n/a
E906	seaquest-ktracker	SRawEvent	SRawEvent	n/a	n/a

Spectrometer Info (Main DAQ)

Event Info: SQEvent & SRawEvent

• Turn ID and RF ID
  t.b.w.
• QIE presum: SQEvent::get_qie_presum(i)
  Never used. Explained in DocDB ????.
• QIE trigger count: SQEvent::get_qie_trigger_count()
  Never used. Explained in DocDB ????.
• RF intensity: SQEvent::get_qie_rf_intensity(i) in E1039 & SRawEvent::fIntensity[16] in E906
  It is proportional to the number of protons. The coefficient varies with time/run, but you can use "1 QIE count = 30 protons" in rough estimate.qie_rf_intensity stores the raw ADC counts of RF-bucket intensities measured by the Cherenkov beam counter. It has 33 elements (RF-16...RF+16), where RF+00 corresponds to the triggered RF bucket. RF+01/RF-01 corresponds to the next/previous RF bucket.
• Trigger:
  • An event can be fired by many triggers. To get the triggers fired : SQEvent::get_trigger()
  • Return is an integer.
  • Convert the decimal to binary to get the bit stream. Each resultant bit is assigned to a trigger.
  • Use get_trigger(SQEvent::TrigerMask) to see if a particular trigger is fired in the event considered.
  • Check TrigerMask for the trigger assignment.

MC Event Info: SQMCEvent

• Event weight: SQMCEvent::get_weight()
  • The PYTHIA8 generator (PHPythia8) doesn't make use of it and thus it is always 1.
  • The E906 generator (SQPrimaryParticleGen) sets it to "cross section * luminosity". You have to count up the event yield with the event weight, e.g. the contents of a histogram bin have to be the sum of event weights.
  • When you are interested in the absolute yield, you normalize the (weighted) event yield by the simulated luminosity, where the simulated luminosity per job (=DST) is provided by PHGenIntegral. The normalized (weighted) event yield means the differential cross section of the bin. You could multiply it by a value of anticipated luminosity (like per one week, one month, etc.) to obtain the anticipated yield in the bin.

Hit Info: SQHit

• The occupancy is defined as the number of chamber hits per station. When the occupancy of an event is above the upper limit at any station, the reconstruction (kTracker) skips the event.

Beam Info (Beam DAQ)

• Detector and readout: DocDB 537
• Live PoT: DocDB1212
• Intensity:Chamber (Drift?) intensity interms of QIE unit. (Question from Abi: How it is different from RF+00? Is it collection of all RF buckets QIE that falls into the drift time (600 ns) ?
• Intensity_p:
• PotPerQie:

Scaler Info (Scaler DAQ)

ACNET Info

ACNET = Accelerator Control NETwork managed by Fermilab.

Name	Unit	Meaning
F:NS2FLO	gpm	Flow rate of LCW at NS2?
F:NS2SUP	degF	Temperature of LCW supply at NS2?
F:NS2RET	degF	Temperature of LCW return at NS2?
F:NM2V	amps
F:NM2D1	amps
F:NM2H	amps
F:NM3S	amps	FMag current.
F:NM4AN	amps	KMag current.
I:BEAM21	E12
I:VFOUT	Hz
E:M3TGHM	mm	Mean of horizontal beam profile measured at NM3.
E:M3TGHS	mm	Sigma of horizontal beam profile measured at NM3.
E:M3TGVM	mm	Mean of vertical beam profile measured at NM3.
E:M3TGVS	mm	Sigma of vertical beam profile measured at NM3.
E:M3TGHI	n/a	Fitted center of horizontal beam profile?? Obsolete?
E:M3TGHF	n/a	Fitted width of horizontal beam profile?? Obsolete?
E:M3TGVI	n/a	Fitted center of vertical beam profile?? Obsolete?
E:M3TGVF	n/a	Fitted width of vertical beam profile?? Obsolete?
E:M2C2HM	mm	At NM2.
E:M2C2HS	mm	At NM2.
E:M2C2VM	mm	At NM2.
E:M2C2VS	mm	At NM2.
E:M2C2HI	n/a	At NM2.
E:M2C2HF	n/a	At NM2.
E:M2C2VI	n/a	At NM2.
E:M2C2VF	n/a	At NM2.
L:CBAR	MB	At NM2.
S:KTEVTC	Torr	At NM2.
F:NM2ION	ppp	Number of protons measured with Ion Chamber at NM2.
F:NM3ION	ppp	Number of protons measured with Ion Chamber at NM3.
F:NM3SEM	ppp	Number of protons measured with SEM at NM3.
F:NS7DFP	psi
M:OUTTMP	degF	Outside temperature?
F:E906BM	cnts	Scaler counts of E906 Beam Monitor (which no longer exists).
S:G2SEM	ppp	Number of protons measured with SEM at G2.
F:NM3RST	degF
F:NM3RRT	degF
G:TURN13		Number of turns where a set of protons are injected into single RF bucket.
G:BNCH13	bnch	Number of filled RF buckets per cycle (= 84 RF buckets). 84 at max.
G:NBSYD		Number of filled RF buckets every 7 RF buckets. 7 at max.
S:MSEP1U	Mils
S:F1SEM	Ptns	Number of protons measured with SEM at F1?
F:NM2Q1	Amps
F:NM2Q2	Amps
U:TODB25	Date
G:RD3161	mrem
G:RD3162	mrem
I:FTSDF	53k%	Duty factor sampled at 53 kHz.
F:MT6SC1	Cnts
F:MC7SC1	Cnts
F:MC1D	amps
F:MW1W	Amps
F:NM4LCWFLOW	gpm	Flow rate of LCW at NM4.
F:NM4LCWP1	psig	Pressure of LCW return at NM4.
F:NM4LCWP2	psig	Pressure of LCW supply before regulator(?) at NM4.
F:NM4LCWP3	psig	Pressure of LCW supply at NM4.
F:NM4LCWT1	degF	Temperature of LCW return at NM4.
F:NM4LCWT2	degF	Temperature of LCW supply at NM4.
F:NM4LCWT3	degF	Invalid.
G:OUTTMP	degF	Outside temperature.
G:HUMID	%	Outside humidity.
G:BPRESS	mBar	Barometric pressure.