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The Tagger Microscope is expected to have a time resolution of 200 ps or better. This specification imposes a strict demand on the light pulse rise time uncertainty because it introduces trigger time uncertainty when Constant Fraction Trigger (CFT) point is used.
= Scintillation Pulse Time Resolution =
The scintillations in the fiber are distributed exponentially with a characteristic decay time <math>\tau</math> = 2.7 for [http://www.detectors.saint-gobain.com/Data/Element/Product/product.asp?ele_ch_id=P0000000000000001909 BCF-10/20]. Since the variance is <math>\tau^2</math> (and is additive over independent events) the time uncertainty for N generated photons becomes <math>\tau/N^{1/2}</math>. Thus, in order of priority, this relation implies
# scintillating fiber with smallest decay time must be procured
# photon capture and detection efficiency must be optimized
= Scintillation Pulse Time Resolution =
The scintillations in the fiber are distributed exponentially with a characteristic decay time <math>\tau</math> = 2.7 for [http://www.detectors.saint-gobain.com/Data/Element/Product/product.asp?ele_ch_id=P0000000000000001909 BCF-10/20]. Since the variance is <math>\tau^2</math> (and is additive over independent events) the time uncertainty for N generated photons becomes <math>\tau/N^{1/2}</math>. Thus, in order of priority, this relation implies
# scintillating fiber with smallest decay time must be procured
# photon capture and detection efficiency must be optimized