mip resolution/linearity/long. profile/x0 attenuation
DESCRIPTION
Mip Resolution/Linearity/Long. Profile/X0 Attenuation. MIP. Loose Selection Etot_adc_high < 1500 Tight Selection Etot_adc_high < 1000 Elayer_adc_highTRANSCRIPT
• Mip• Resolution/Linearity/Long. Profile/X0• Attenuation
MIP• Loose Selection
– Etot_adc_high < 1500
• Tight Selection – Etot_adc_high < 1000– Elayer_adc_high <100
• Special Selection
<10 > 5
<10 ●
Etot_adc_high
<4 >12 <4
●
<4 <4 >12
●
>12 <4 <4
●
<5 >12 <5
<5 ● <5
Fit
• Landau Gaussian
+ exponential background
• Mip is given by the MPV of the Landau function
• Meaning of
– Landau/ Gaussian Width
– would like to relate one to the single channel resolution
Illustration of the 3 selections
Comparison All methods
Loose Tight Special
Sylvie Zuhao
Delta = ~ 1adc
Average Mip Per Layer
Energy Resolution
• Lists of Runs 1. 6 Gev : 386,387 2. 10 GeV : 427,381,453,557,3. 30 GeV : 3564. 50 GeV : 3925. 70 GeV : 396 6. 100 GeV : 397 7. 120 GeV : 414,418,4198. 150 GeV : 401,5179. 180 GeV : 40510.210 GeV : 395,407,40811.250 GeV : 394,393,410
• Position (~ center of cell) - Xtab = - 2.7 mm - Ytab = + 2.7 mm
• MIP from Loose Selection
• Gain :
– protons
– 10, 30 and 150 GeV
– Gaussian Fit of high_gain/low_gain
Detailed studies:
Stefano & Sylvie
Election Identification
• Some Energy largely polluted by hadrons (6 GeV and 10 GeV)
• Selection on the Shape :– E9x/E25x and E9y/E25y – Widthx and Widthy – multiplicity
Electron ID (con’t)6GeV
30GeV
1rst Iteration of Position Correction
• Approximate ADC to GeV conversion using 6 GeV (minimal leakage)
• Color : Etot_mean / E_beam (i.e red ~ 1) • Idem for all 11 energies • → Average correction depending on barycenter
position (10 * 10 bins)
30 GeV Electrons
X bary ( 0 > cell center)
Y
Leakage Correction
• Approximate GeV Conversion using:
– 6 GeV/Etot_adc. = 2225.
• Vitaly & Loic ’s method
– Ebeam/Erec =
f( E_layer17/Erec)
– f : 1st degree polynomial → slope, const per energy
• mean slope / mean cons
Example @ 30 GeV
– Ebeam/Erec = f((E_lay16+E_lay17)/Erec )
• to be compared with E_lay17/Erec
– Combine all Beam energies in the same plot
– Fit one slope and one constant
Linearity and Resolution
• No selection according to position
• Same treatment @ all energies’
• NB : better if cut on xbary & ybary
6 GeV
S. Rosier
70 GeV
S. Rosier
210 GeV
S. Rosier
X0=1.07 lu => 17.2 X0 pour le calo
S. Rosier
Attenuation
• Mip – protons scan in X and Y – position is given by the table coordinate– all layers
• Electrons Scan in X and Y – 10 GeV,30 GeV (and 150 GeV) – position is given :
• Case 1 : by the table (easier) • Case 2 : by the tracker ….
– central layers• Hypothesis
– attenuation identical for all cells – combined fit
PM 17/18 > Cell 34 to 37
Example of Mip Variation along X/Y
Close to PM
Far to PM
Idem Layer 16
Example of Mip Evolution
The line is to guide the eyes …
mm (Table position)
Electrons (case1)
• Idem in X and Y
• 10 GeV > high gain
• 30 GeV & 150 GeV > low gain
• Dynode signal also used
• Case where the position is given by the (relative) table position
PM 17 } cell 34+cell35
Beam
Electrons (Case 1)
Fit : Gaussian + Exponential background
Example of Distribution (case 1)
Anode Dynode
Combined Fit
• 3 parameters
– Frac, Fast, Slow
• N amplitudes
• Electrons
– pos < 2 cm from edges not used
Attenuation Results
• Black : 10 & 30 GeV – table position
• Red : idem – xytracker
• Green : Mip only
• Blue : Mip , 10 & 30 GeV
• Yellow : idem + 150 GeV electrons
Δ(black-red)
Ytracker vs Ycoo
ytracker
ycoo
ladder 0/ zoom ladder 1
ladder 2
xcoo = 9.1 xbary – 311.5 ycoo = 9.1 ybary – 316.5
• Fold ycoo wrt to Table displacement
– ycoo = ycoo +ΔTable
• Restrict ycoo to the center of the cell (better measurement)
• “same beam”
• ytracker = P1*ycell + P0
• idem for the 3 ladders
• mean
Final adjustement
• We have now a Y position independent of the calorimeter
Final P1 / 648 mm
P0
Xtracker : idem but more complicated
Back to Attenuation ()
• 10 GeV and 30 GeV electrons
• E_Layer (anode/dynode) vs x-ytracker