Constants to Review

These are constants whose values need to be revisited

FCAL

Description	Variable	Value	File	Line/Function
fADC counts -> physical units	a_scale	1.0E6/1.3E5	DFCALHit_factory.cc	53
shower profile parameters?			DFCALCluster	shower_profile()
mcsmear gaussian time resolution (ps)		200.	mcsmear/smear.cc	869

CDC

Description	Variable	Value	File	Line	Action to take
fADC counts -> physical units	a_scale	1.0E6/1.3E5	DCDCHit_factory.cc
Energy conversion factor for dE calc.	w_eff	29.5E-9	DCDCTrackHit_factory.cc	109
Gain factor for dE calc.	gas_gain	1.0E5	DCDCTrackHit_factory.cc	110
initial time -> drift conversion		55.0E-4	DCDCTrackHit_factory.cc	113	Remove

FDC

Description	Variable	Value	File	Line
fADC counts -> physical units	a_scale	2.4E4/1.3E5	DFDCHit_factory.cc
Time range used to cluster cathode hits (ns)	TIME_SLICE	10	DFDCCathodeCluster_factory.cc	10
Energy conversion factor for dE calc.	W_EFF	30.2e-9	DFDCPseudo_factory.cc	26
Gain factor for dE calc.	GAS_GAIN	8e4	DFDCPseudo_factory.cc	27

BCAL

Description	Variable	Value	File	Line
fADC counts -> physical units, 100 keV/count (?)	a_scale	0.0001	DBCALHit_factory.cc	38
non-linear shower energy corrections			DBCALShower_factory_IU.cc	23-46
sigma(z) estimation, cm (with TDC info, from NIM article)	m_sig_z	1.1 / sqrt(E)	DBCALPoint.cc	96
sigma(z) estimation, cm (without TDC info, from NIM article)	m_sig_z	30.	DBCALPoint.cc	104

In DBCALUnifiedHit_factory::brun():34-119 - Need to revisit timewalk corrections.

TOF

Description	Variable	Value	File	Line
fADC counts -> physical units	a_scale	0.2/5.2E5	DTOFHit_factory.cc
fADC time resolution (ns)	hit->sigma_t	4.0	DTOFHit_factory.cc
TDC time resolution (ns)	hit->sigma_t	0.160	DTOFHit_factory.cc

t0 offset for fADC?

Start Counter

Description	Variable	Value	File	Line
fADC counts -> physical units	a_scale	2.0E-2/5.2E-5	DSCHit_factory.cc	36
fADC time resolution (ns)	hit->sigma_t	4.0	DSCHit_factory.cc	37
TDC time resolution (ns)	hit->sigma_t	0.160	DSCHit_factory.cc	38

Geometry constants

FDC

FDC/DFDCGeometry.h has a bunch of constants that need to be reconciled with HDGeant/hitFDC.c Note that HDGeant/hitFDC.c actually reads these out of the CCDB (!)

//----- These were cut from HDGeant/hitFDC.c -----
#define DRIFT_SPEED           .0055
#define CATHODE_ROT_ANGLE     1.309  // 75 degrees
//#define CATHODE_ROT_ANGLE     0.7854 // 45 degrees
#define WIRE_DEAD_ZONE_RADIUS 3.2
#define ANODE_CATHODE_SPACING 0.5
#define TWO_HIT_RESOL         250.
#define WIRES_PER_PLANE       96
#define WIRE_SPACING          1.0
#define U_OF_WIRE_ZERO        (-((WIRES_PER_PLANE-1)*WIRE_SPACING)/2)
#define STRIPS_PER_PLANE      192 
#define STRIP_SPACING         0.5
#define U_OF_STRIP_ZERO            (-((STRIPS_PER_PLANE-1)*STRIP_SPACING)/2)
#define STRIP_GAP             0.1
#define MAX_HITS             100
//#define K2                  1.15
#define STRIP_NODES           3
#define THRESH_KEV           1.
#define THRESH_STRIPS        5.   /* mV */
#define ELECTRON_CHARGE 1.6022e-4 /* fC */
//------------------------------------------------