• 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