Constants.h File Reference

Global TRD definitions and constants. More...

Go to the source code of this file.

Namespaces
namespace	o2
	a couple of static helper functions to create timestamp values for CCDB queries or override obsolete objects
namespace	o2::trd
namespace	o2::trd::constants

Variables
constexpr int	o2::trd::constants::NSECTOR = 18
	the number of sectors
constexpr int	o2::trd::constants::NSTACK = 5
	the number of stacks per sector
constexpr int	o2::trd::constants::NLAYER = 6
	the number of layers
constexpr int	o2::trd::constants::NCHAMBERPERSEC = 30
	the number of chambers per sector
constexpr int	o2::trd::constants::NHCPERSEC = 60
	the number of half-chambers per sector
constexpr int	o2::trd::constants::MAXCHAMBER = 540
	the maximum number of installed chambers
constexpr int	o2::trd::constants::MAXHALFCHAMBER = 1080
	the maximum number of installed half-chambers
constexpr int	o2::trd::constants::NCHAMBER = 521
	the number of chambers actually installed
constexpr int	o2::trd::constants::NHALFCRU = 72
	the number of half cru (link bundles)
constexpr int	o2::trd::constants::NLINKSPERHALFCRU = 15
	the number of links per half cru or cru end point.
constexpr int	o2::trd::constants::NLINKSPERCRU = 30
	the number of links per CRU (two CRUs serve one supermodule)
constexpr int	o2::trd::constants::NCRU = 36
	the number of CRU we have
constexpr int	o2::trd::constants::NFLP = 12
	the number of FLP we have.
constexpr int	o2::trd::constants::NCRUPERFLP = 3
	the number of CRU per FLP
constexpr int	o2::trd::constants::TRDLINKID = 15
	hard coded link id, specific to TRD
constexpr int	o2::trd::constants::NCOLUMN = 144
	the number of pad columns for each chamber
constexpr int	o2::trd::constants::NROWC0 = 12
	the number of pad rows for chambers of type C0 (installed in stack 2)
constexpr int	o2::trd::constants::NROWC1 = 16
	the number of pad rows for chambers of type C1 (installed in stacks 0, 1, 3 and 4)
constexpr int	o2::trd::constants::FIRSTROW [NSTACK] = {0, 16, 32, 44, 60}
	first pad row for each stack
constexpr int	o2::trd::constants::NMCMROB = 16
	the number of MCMs per ROB
constexpr int	o2::trd::constants::NMCMHCMAX = 64
	the maximum number of MCMs for one half chamber (C1 type)
constexpr int	o2::trd::constants::NMCMROBINROW = 4
	the number of MCMs per ROB in row direction
constexpr int	o2::trd::constants::NMCMROBINCOL = 4
	the number of MCMs per ROB in column direction
constexpr int	o2::trd::constants::NROBC0 = 6
	the number of ROBs per C0 chamber
constexpr int	o2::trd::constants::NROBC1 = 8
	the number of ROBs per C1 chamber
constexpr int	o2::trd::constants::NADCMCM = 21
	the number of ADC channels per MCM
constexpr int	o2::trd::constants::NCOLMCM = 18
	the number of pads per MCM
constexpr int	o2::trd::constants::NCHANNELSPERROW = NMCMROBINCOL * 2 * NADCMCM
	the number of readout channels per pad row
constexpr int	o2::trd::constants::NCHANNELSC0 = NROWC0 * NCHANNELSPERROW
	the number of readout channels per C0 chamber
constexpr int	o2::trd::constants::NCHANNELSC1 = NROWC1 * NCHANNELSPERROW
	the number of readout channels per C1 chamber
constexpr int	o2::trd::constants::NCHANNELSTOTAL = NSECTOR * NLAYER * (NSTACK - 1) * NCHANNELSC1 + NSECTOR * NLAYER * NCHANNELSC0
	the total number of readout channels for TRD
constexpr int	o2::trd::constants::NCHANNELSPERSECTOR = NCHANNELSTOTAL / NSECTOR
	then number of readout channels per sector
constexpr int	o2::trd::constants::NCHANNELSPERLAYER = NCHANNELSPERSECTOR / NLAYER
	then number of readout channels per layer
constexpr int	o2::trd::constants::NCPU = 4
	the number of CPUs inside the TRAP chip
constexpr int	o2::trd::constants::NCHARGES = 3
	the number of charges per tracklet (Q0/1/2)
constexpr int	o2::trd::constants::NBITSTRKLPOS = 11
	number of bits for position in tracklet64 word
constexpr int	o2::trd::constants::NBITSTRKLSLOPE = 8
	number of bits for slope in tracklet64 word
constexpr int	o2::trd::constants::ADDBITSHIFTSLOPE = 1 << 3
	in the TRAP the slope is shifted by 3 additional bits compared to the position
constexpr int	o2::trd::constants::PADGRANULARITYTRKLPOS = 40
	tracklet position is stored in units of 1/40 pad
constexpr int	o2::trd::constants::PADGRANULARITYTRKLSLOPE = 128
	tracklet deflection is stored in units of 1/128 pad per time bin
constexpr float	o2::trd::constants::GRANULARITYTRKLPOS = 1.f / PADGRANULARITYTRKLPOS
	granularity of position in tracklet64 word in pad-widths
constexpr float	o2::trd::constants::GRANULARITYTRKLSLOPE = 1.f / PADGRANULARITYTRKLSLOPE
	granularity of slope in tracklet64 word in pads/timebin
constexpr int	o2::trd::constants::ADCBASELINE = 10
	baseline in ADC units
constexpr int	o2::trd::constants::TIMEBINS = 30
	the number of time bins
constexpr float	o2::trd::constants::MAXIMPACTANGLE = 25.f
	the maximum impact angle for tracks relative to the TRD detector plane to be considered for vDrift and ExB calibration
constexpr int	o2::trd::constants::NBINSANGLEDIFF = 25
	the number of bins for the track angle used for the vDrift and ExB calibration based on the tracking
constexpr double	o2::trd::constants::VDRIFTDEFAULT = 1.546
	default value for vDrift
constexpr double	o2::trd::constants::EXBDEFAULT = 0.0
	default value for LorentzAngle
constexpr int	o2::trd::constants::NBINSGAINCALIB = 320
	number of bins in the charge (Q0+Q1+Q2) histogram for gain calibration
constexpr float	o2::trd::constants::MPVDEDXDEFAULT = 42.
	default Most Probable Value of TRD dEdx
constexpr float	o2::trd::constants::T0DEFAULT = 1.2
	default value for t0
constexpr int	o2::trd::constants::HBFBUFFERMAX = 1048576
	max buffer size for data read from a half cru, (all events)
constexpr unsigned int	o2::trd::constants::CRUPADDING32 = 0xeeeeeeee
	padding word used in the cru.
constexpr int	o2::trd::constants::CHANNELNRNOTRKLT = 23
	this marks channels in the ADC mask which don't contribute to a tracklet
constexpr int	o2::trd::constants::NOTRACKLETFIT = 31
	this value is assigned to the fit pointer in case no tracklet is available
constexpr int	o2::trd::constants::TRACKLETENDMARKER = 0x10001000
	marker for the end of tracklets in raw data, 2 of these.
constexpr int	o2::trd::constants::PADDINGWORD = 0xeeeeeeee
	half-CRU links will be padded with this words to get an even number of 256bit words
constexpr int	o2::trd::constants::DIGITENDMARKER = 0x0
	marker for the end of digits in raw data, 2 of these
constexpr int	o2::trd::constants::MAXDATAPERLINK32 = 13824
	max number of 32 bit words per link ((21x12+2+4)*64) 64 mcm, 21 channels, 10 words per channel 2 header words(DigitMCMHeader DigitMCMADCmask) 4 words for tracklets.
constexpr int	o2::trd::constants::MAXDATAPERLINK256 = 1728
	max number of linkwords per cru link. (256bit words)
constexpr int	o2::trd::constants::MAXEVENTCOUNTERSEPERATION = 200
	how far apart can subsequent mcmheader event counters be before we flag for concern, used as a sanity check in rawreader.
constexpr int	o2::trd::constants::MAXMCMCOUNT = 69120
	at most mcm count maxchamber x nrobc1 nmcmrob
constexpr int	o2::trd::constants::MAXLINKERRORHISTOGRAMS = 10
	size of the array holding the link error plots from the raw reader
constexpr int	o2::trd::constants::MAXPARSEERRORHISTOGRAMS = 60
	size of the array holding the parsing error plots from the raw reader
constexpr unsigned int	o2::trd::constants::ETYPEPHYSICSTRIGGER = 0x2
	CRU Half Chamber header eventtype definition.
constexpr unsigned int	o2::trd::constants::ETYPECALIBRATIONTRIGGER = 0x3
	CRU Half Chamber header eventtype definition.
constexpr int	o2::trd::constants::MAXCRUERRORVALUE = 0x2
	Max possible value for a CRU Halfchamber link error. As of may 2022, can only be 0x0, 0x1, and 0x2, at least that is all so far(may2022).
constexpr int	o2::trd::constants::INVALIDPRETRIGGERPHASE = 0xf
	Invalid value for phase, used to signify there is no hcheader.

Detailed Description

Global TRD definitions and constants.

Author

ole.s.nosp@m.chmi.nosp@m.dt@ce.nosp@m.rn.c.nosp@m.h

Definition in file Constants.h.