energy resolution and energy resolution and
uniformityuniformitySPS-1/2 runs (e data): (AliRoot analysis, using trunk version as of Feb.20)
(14) 6 positions 5-100 GeV electrons
module&tower centers, module borders
energy resolution @different positions:
resolution of beam energy
different collimator settings @60-100GeV
uniformity of energy response with 80GeV electrons
EMCAL test beam 2007 @cern SPS/PS
Delia Hasch emcal meeting Nantes 15-17/07/2008
containing all changes from Jennifer++
caveats: (relative) tower-to-tower re-calibration first point on ToDo list
energy resolution energy resolution @diff. @diff.
positionspositions
run371 @80 GeV run589 @80 GeV
‘good’ calibration ‘bad’ calibration
Delia Hasch emcal meeting Nantes 15-17/07/2008
(relative) re-calibration needed (on ToDo list)
EMCAL test beam 2007 @cern SPS/PS
energy resolution energy resolution @diff. @diff.
positionspositions
single position resolution
only ‘good’ calibrations: 14 6 positions
Delia Hasch emcal meeting Nantes 15-17/07/2008
EMCAL test beam 2007 @cern SPS/PS
energy resolution energy resolution @diff. @diff.
positionspositions
single position resolution
only ‘good’ calibrations: 14 6 positions
Delia Hasch emcal meeting Nantes 15-17/07/2008
Alexei’s values (June08)summing all SPS-1 runs after re-calibration
EMCAL test beam 2007 @cern SPS/PS
linearity linearity @diff. positions@diff. positions
~ (still) factor 0.8 off … any idea ?
Delia Hasch emcal meeting Nantes 15-17/07/2008
only ‘good’ calibrations: 14 6 positions
EMCAL test beam 2007 @cern SPS/PS
beam energy resolutionbeam energy resolution determined by position of momentum defining collimators C3, C8:
[%]4.19
8C3C 22
p
p
with C3/C8 … full width opening of the collimators [mm]
C3/8 standard settings @SPS: ±30 mm:
rms: %3.1~12
%4.4 0.7% @ ±10 mm
Delia Hasch emcal meeting Nantes 15-17/07/2008
factor 19.4% … vertical momentum dispersion of beam at C3 compared to C8
EMCAL test beam 2007 @cern SPS/PS
standard settings: C3/C8 @30 mm C3/C8 @10 mm (run727,28,34)
beam energy resolutionbeam energy resolution
single position resolution
Delia Hasch emcal meeting Nantes 15-17/07/2008
determined by position of momentum defining collimators C3, C8:
EMCAL test beam 2007 @cern SPS/PS
Delia Hasch emcal meeting Nantes 15-17/07/2008
rear view
module/tower borders
tower centers
module centers
position scan80 GeV electron beam
uniformity of responseuniformity of response
processing…
EMCAL test beam 2007 @cern SPS/PS
uniformity of responseuniformity of response
module centers
module borders tower centers
80 GeV electron beam: position scan ToDo: (relative) re-calibration; correction for time dependence (temp) of gain
Delia Hasch emcal meeting Nantes 15-17/07/2008
3% variation
2.4% resolutionfrom Alexei after recalibration
EMCAL test beam 2007 @cern SPS/PS
• reconstructed energy > incident energy:
for discussion: gain jumpsfor discussion: gain jumps
run725 @80GeV run726 @60GeV
mean: 120 GeV mean: 100 GeV
Delia Hasch emcal meeting Nantes 15-17/07/2008
no ‘extreme’ temperature behaviour observed… any hint ?
EMCAL test beam 2007 @cern SPS/PS
an interesting an interesting
point…point…
Delia Hasch emcal meeting Nantes 15-17/07/2008
80GeV incident beam energy
‘MC’ calib data base ‘test beam’ calib data base
factor 0.8 off
EMCAL test beam 2007 @cern SPS/PS
iterative from data at module centers using events with 4 cells per cluster
‘cross check’ with data at tower centers / mip calibration (see Marie’s studies) / re-calib from Alexei …
ToDoToDo
using correction routine from David
Delia Hasch emcal meeting Nantes 15-17/07/2008
apply temperature gain corrections for uniformity studies
relative tower –to- tower calibration for both energy scans and uniformity studies :
EMCAL test beam 2007 @cern SPS/PS
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