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History: BigBite Drift Time to Distance

Comparing version 1 with version 4

Version: 1		Version: 4 (current)
riordan - Tue 12 of Jun, 2007 [15:17 UTC]		riordan - Tue 12 of Jun, 2007 [15:23 UTC]
@@ -Lines: 2-6 changed to +Lines: 2-6 @@ Drift time to distance can be well described by the formula - ::d = c0tanh((v/c0)(t-t0) + (c2/c0)(t-t0) ):: + ::d = c0tanh((v/c0)(t-t0) + (c2/c0)(t-t0)**2 ):: Where c0 is the half width of the drift chamber cell (0.5cm for GEn), v is the constant drift velocity at low drift times (on the order of 5x10^-5 m/ns), and t0 is a global TDC offset. @@ -Lines: 12-16 changed to +Lines: 12-16 @@ Attached is a script that calculates these values from a replay. This replay requires that there be no cuts in drift time done (so drift.min and drift.max in db_B.dc.dat should be set to very low and high values). This is required to remove the large background contributions. Also, tracking should be disabled for this type of run so it does not become overwhelmed with the large number of drift chamber hits. - This script should not be run blindly and will not run without adding in parameters such as the ROOT file path, number of drift planes, etc. There is a number of defined values that are required and can be found in a mwdc_defs.h header. (See (BigBite Analysis Scripts) for a copy) + This script should not be run blindly and will not run without adding in parameters such as the ROOT file path, number of drift planes, etc. There is a number of defined values that are required and can be found in a mwdc_defs.h header. (See ((BigBite Analysis Scripts\|BigBite Analysis Scripts)) for a copy) The output to stdout is identical to that required in db_B.dc.dat using the THaVDCFuncTTDConv class.

History

Legend: v=view, s=source

Date	User	Ip	Comment	Version	Action
Tue 12 of Jun, 2007 [15:23 UTC]	riordan	128.2.112.124		4 current	v s
Tue 12 of Jun, 2007 [15:22 UTC]	riordan	128.2.112.124		3	v s
Tue 12 of Jun, 2007 [15:19 UTC]	riordan	128.2.112.124		2	v s
Tue 12 of Jun, 2007 [15:17 UTC]	riordan	128.2.112.124		1	v s

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5)	BigBite Geometry and Survey
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10)	Helicity

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