Difference between revisions of "BCAL Beam Test Plots, November 20, 2006"
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* Gain Correction: | * Gain Correction: | ||
| − | *# Establish the '''means''' of each cell in the Monte Carlo and find the ratio wrt MC Cell 8 | + | *# Establish the '''means''' of each cell in the Monte Carlo and find the ratio wrt MC Cell 8 over whole tagger spectra |
*# Find the current ratio of each ADC in the beamtest data wrt to North 8 | *# Find the current ratio of each ADC in the beamtest data wrt to North 8 | ||
*# Correct the ADC ratio to match the Monte Carlo Ratios | *# Correct the ADC ratio to match the Monte Carlo Ratios | ||
| Line 39: | Line 39: | ||
[[Image:AdcsumS 500to600.gif|thumb|none|100px|ADCsum South 500<Ephoton<600]] | [[Image:AdcsumS 500to600.gif|thumb|none|100px|ADCsum South 500<Ephoton<600]] | ||
<br> | <br> | ||
| − | This seems to remove the "junk" from the left of the spectra, and will flatten out the MC8/North8 ratio. But what is the "junk? | + | *This seems to remove the "junk" from the left of the spectra, and will flatten out the MC8/North8 ratio. But what is the "junk? |
| − | [[Image:North8 junk 300to400.gif| | + | [[Image:North8 junk 300to400.gif|320px|none]] |
| + | *-This has a 2% or more effect on the mean for 300<Ephoton<400. Probably much larger effect for the lower energies. | ||
| + | <br> | ||
| + | <br> | ||
| + | *Compare North 8 over all spectra when cutting on adcsumN > Ch1000 ~ 140MeV to previous | ||
| + | [[Image:EnergyN8 adcsumcut.gif|320px|left|with cut]] [[Image:EnergyN8.gif|320px|left|previously]] | ||
Revision as of 15:59, 19 November 2006
First go
- Gain Correction:
- Establish the means of each cell in the Monte Carlo and find the ratio wrt MC Cell 8 over whole tagger spectra
- Find the current ratio of each ADC in the beamtest data wrt to North 8
- Correct the ADC ratio to match the Monte Carlo Ratios
- The ratio of MC Cell 8 to North 8 defines the MeV/Channel
- How does this look over the entire tagger spectrum?
The 0.151 MeV/Ch is for a tagger photon (digregard this). The others are for energy deposit in the scintillator.
- What if we look at MC 8 vs North 8 with Tagger Energy cuts?
- Very Strange: Apparent Energy Dependence
- How do we see what's going on?
- Cuts: Trig==8 (MOR and BCal OR), Nphotons==1
- Possibly there are e+e-, maybe. Need to check the veto but it doesn't seem to be in the Root Trees
- Cut out the lower hump from the ADC sum.
- This seems to remove the "junk" from the left of the spectra, and will flatten out the MC8/North8 ratio. But what is the "junk?
- -This has a 2% or more effect on the mean for 300<Ephoton<400. Probably much larger effect for the lower energies.
- Compare North 8 over all spectra when cutting on adcsumN > Ch1000 ~ 140MeV to previous
