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ICD/MG Detectors. Reweighting the ICD response First look at Muons. Some news on the ICD detector. Bob Kehoe noticed that the L1 CAL towers that include mainly ICD towers report much more energy than the precision readout I noticed the following:. Response. ICD Fraction.

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Icd mg detectors
ICD/MG Detectors

  • Reweighting the ICD response

  • First look at Muons

Vivian O’Dell, Fermilab


Some news on the icd detector
Some news on the ICD detector

  • Bob Kehoe noticed that the L1 CAL towers that include mainly ICD towers report much more energy than the precision readout

  • I noticed the following:

Response

ICD Fraction

Vivian O’Dell, Fermilab


Response in mg detectors montecarlo
Response in MG Detectors: MonteCarlo

ICD

ECMG

Response

Monte Carlo predicts

response Vs. fraction

should be flat

CCMG

Fraction (0.0 - 1.0)

Vivian O’Dell, Fermilab


Response in mg detectors data
Response in MG Detectors: Data

ICD

ECMG

Response

Both ICD and CCMG

look low to me.

CCMG

Fraction (0.0 - 1.0)

Vivian O’Dell, Fermilab


Icd reweighting
ICD reweighting?

  • Calibration of the ICD was done on a test stand using sources for MIP peaks

  • The test stand used Calorimeter preamps because they have higher gains and made calibration of small signals easy

  • In going from ADC counts to energy the difference of the calorimeter preamps/ICD preamps used in the detector was taken out

  • This factor was 3.8 - measured on the test stand

  • The ICD readout is really lower by 3.8 because of the lower gain preamps - which means this factor needs to go back in.

  • If all this confuses you, it’s because I don’t understand it either

Vivian O’Dell, Fermilab


Icd reweighting1

Response

ICD Fraction

ICD reweighting?

  • I put this factor of 3.8 in a crude way into the response/fraction calculations and get:

Vivian O’Dell, Fermilab


Data monte carlo
Data/Monte Carlo

Correction Effect

With ICD

Correction

Without ICD

Correction

Vivian O’Dell, Fermilab


Looking at muons
Looking At Muons

  • It would be nice to find MIP peaks in the MG detectors to see where they are in the data

  • For each good Muon object, make a linear extrapolation from the vertex to A Layer

  • Then I look at Delta Eta, Delta Phi between Muon extrapolation and Cal Cells

All Cells

Closest Cell

in dEta, dPhi

Delta Eta between Muon Object and ICD Cell

Cut at +- 0.2

Vivian O’Dell, Fermilab


Looking at muons1
Looking At Muons

Layer 7 (EM Layer 4)

CC MG

EC MG

ICD

Vivian O’Dell, Fermilab


Energy in closest cells
Energy in Closest Cells

Energy in ICD

Energy

in an

ICD Cell

Energy

in closest

ICD cell

ICD Energy in closest -

energy in random cell

‘Peak’ at

~200 MeV?

Vivian O’Dell, Fermilab


Energy in closest cells1
Energy in Closest Cells

Energy in CCMG

Energy

in an

CCMG Cell

Energy

in closest

CCMG cell

‘Peak’ at

~150 MeV?

CCMG Energy in

closest cell - energy in

random cell

Vivian O’Dell, Fermilab


Energy in closest cells2
Energy in Closest Cells

Energy in ECMG

Energy

in an

ECMG Cell

Energy

in closest

ECMG cell

‘Peak’ at

~150 MeV?

ECMG Energy in

closest cell - energy in

random cell

Vivian O’Dell, Fermilab


Energy in closest cells3
Energy in Closest Cells

Energy in Layer 7

Energy

in an

L7 Cell

Energy

in closest

L7 cell

‘Peak’ at

~75 MeV?

L7 Energy in

closest cell - energy in

random cell

Vivian O’Dell, Fermilab


Icd next step
ICD next step

  • ICD also has channel to channel variation of MIP peaks as seen on the test stand - I would like to reproduce this with muon data - but clearly this will take a lot of data

  • If we need channel - to - channel variations of calibration in reco, this is a non-trivial change to the calorimeter software framework

  • Would like to get the factor of 3.8 into the next reco version and see how that helps

  • Would like to understand CC & EC MG detectors better as well

Vivian O’Dell, Fermilab


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