CCDB Tables FDC

Variations

No interesting variations at the moment.

The following tables exist for every FDC package, N=1-4:

FDC/packageN/strip_gains

12 rows, 192 columns	gain correction factors

FDC/packageN/strip_pedestals

12 rows, 192 columns	ADC pedestals

FDC/packageN/strip_timing_offsets

12 rows, 192 columns	timing offsets (ns)

FDC/packageN/wire_timing_offsets

6 rows, 96 columns	timing offsets (ns)

Non-package specific tables:

FDC/lorentz_deflections - 840 rows

x	Parameterization of lorentz deflections
z
bx
bz
nx
nz

FDC/fdc_drift_table (51 rows)

t	drift time (μs) in 100 micron steps

FDC/fdc_parms

FDC_DRIFT_SPEED	0.0055	electron drift velocity
FDC_WIRE_DEAD_ZONE_RADIUS	3.5	dead wire radius
FDC_STRIP_DEAD_ZONE_RADIUS	5.0	other dead wire radius
FDC_ACTIVE_AREA_OUTER_RADIUS	48.5
FDC_ANODE_CATHODE_SPACING	0.5
FDC_TWO_HIT_RESOL	25.
FDC_WIRES_PER_PLANE	96
FDC_WIRE_SPACING	1.
FDC_STRIPS_PER_PLANE	192
FDC_STRIP_SPACING	0.5
FDC_STRIP_GAP	0.1
FDC_MAX_HITS	100
FDC_K2	1.15
FDC_STRIP_NODES	3
FDC_THRESH_KEV	1.	threshold in keV
FDC_THRESH_STRIPS	5.	threshold in pC
FDC_ELECTRON_CHARGE	1.6022e-4	electron charge in fC
FDC_DIFFUSION_COEFF	1.1e-6	diffusion speed cm^2/s --> 200 microns at 1 cm
FDC_TDRIFT_SIGMA	3.6363636e-9	The error on the drift time in the FDC, used to gaussianly smear incoming hits
FDC_CATHODE_SIGMA	150.0	The error in the distance along the wire as measured by the cathodes (NOT including Lorentz effect, but including fluctuations due to ion trail density, in microns)
FDC_PED_NOISE	0.0	The FDC pedestal noise is used to smear the cathode ADC values such that the position along the wire has the resolution specified by FDC_CATHODE_SIGMA, units in pC (calculated from FDC_CATHODE_SIGMA in SmearFDC)
FDC_TIME_WINDOW	1000.0E-9	Time window for acceptance of FDC hits units in seconds
FDC_HIT_DROP_FRACTION	0.0	Fraction of FDC hits to randomly drop (0=drop nothing 1=drop everything)

The following tables should not be used anymore: