energy resolution and uniformity

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energy resolution and energy resolution and uniformity uniformity SPS-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 elect EMCAL test beam 2007 @cern SPS/PS emcal meeting Nantes containing all changes from Jennif caveats: (relative) tower-to-tower re-calibration first point on ToDo list

description

energy resolution and uniformity. EMCAL test beam 2007 @cern SPS /PS. Delia Hasch emcal meeting Nantes 15-17/07/2008. SPS-1/2 runs (e data): (AliRoot analysis, using trunk version as of Feb.20). - PowerPoint PPT Presentation

Transcript of energy resolution and uniformity

Page 1: energy resolution and uniformity

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

Page 2: energy resolution and uniformity

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

Page 3: energy resolution and uniformity

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

Page 4: energy resolution and uniformity

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

Page 5: energy resolution and uniformity

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

Page 6: energy resolution and uniformity

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

Page 7: energy resolution and uniformity

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

Page 8: energy resolution and uniformity

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

Page 9: energy resolution and uniformity

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

Page 10: energy resolution and uniformity

• 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

Page 11: energy resolution and uniformity

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

Page 12: energy resolution and uniformity

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