# Presentation: 268034

## Software and performances

- Release schedule
- Main deliverables for release 14
- LAr calibration in FDR-2 ?
- Sensitivity to upstream material
- CSC notes

*G.Unal,H.Ma*
*06/12/2007*

## Releases

- 13.0.40 very soon, collect all corrections from 13.0.30.X + what is needed for FDR-1
- Currently validating 13.0.30 simulation
- CSC data (rel 12 simulation) being reconstructed with 13.0.30
- 13.0.35 for M5 reprocessing
- 13.1.0 last week, intermediate release towards release 14
- Release 14 (~Feb 2008) could be the one used for the first data taking

## Deliverables for release 14

- Main emphasis is readiness for first data, all required infrastructure, improvement on CPU and memory usage

## Infrastructure / Calibration
Bad channel database (T.Todorov)
Interface and basic tools in 13.1.0
Need to work on Cool backend
And fill with realistic list from commissioning
Then should be used at various steps (HLT, reconstruction, simulation)
Cleaning up HV tools and interfaces
What to do at cell level is ~ understood but should clarify where it is done and how to keep track of what has been done
Common set of interfaces and services being designed by J.Boudreau (cf talk yesterday)
Production of electronics calibration constants
Cf talk by F.Tarrade on automatic processing Monday
Tools for data quality of calibration constants 
Complete missing database structure
For instance store measured noise in MeV from randoms, etc... (this morning database meeting)
A lot of technical work on T/P split for conditions data, jobOptions, etc..

- Bad channel database (T.Todorov)
- Interface and basic tools in 13.1.0
- Need to work on Cool backend
- And fill with realistic list from commissioning
- Then should be used at various steps (HLT, reconstruction, simulation)
- Cleaning up HV tools and interfaces
- What to do at cell level is ~ understood but should clarify where it is done and how to keep track of what has been done
- Common set of interfaces and services being designed by J.Boudreau (cf talk yesterday)
- Production of electronics calibration constants
- Cf talk by F.Tarrade on automatic processing Monday
- Tools for data quality of calibration constants
- Complete missing database structure
- For instance store measured noise in MeV from randoms, etc... (this morning database meeting)
*A lot of technical work on T/P split for conditions data, jobOptions, etc..*

## Robustness/consolidation 
Improve memory/CPU usage
Commissioning reconstruction with 32 samples + random phase is more challenging than “typical” Atlas reconstruction
Double vs float usage in reconstruction
Complete configurable migration
jobOptions better controlled
Merging “commissioning” and “Atlas MC reconstruction” configuration to prepare first reconstruction of collisions data
Also applies to trigger software

- Improve memory/CPU usage
- Commissioning reconstruction with 32 samples + random phase is more challenging than “typical” Atlas reconstruction
- Double vs float usage in reconstruction
- Complete configurable migration
- jobOptions better controlled
- Merging “commissioning” and “Atlas MC reconstruction” configuration to prepare first reconstruction of collisions data
- Also applies to trigger software

## Corrections for first data
With release 14 simulation
Calibration hits method for EM calibration
Detector description
“final” ID description (note that the amount of material has significantly changed compared to release 12 nominal geometry)
Description of dead material in barrel-endcap crack (cf talk by M.Thioye)
Improvement in end-cap geometry description (cf talk by M.Fincke-Keeler)
G4 simulation
Define “best” G4 version / physics list /range cut for the full simulation  => Atlas G4 optimization task force
(cf talks from Tancredi and Andrei at last LAr week)
(frozen showers, Atlfast-2 on the simulation side for physics events => a lot of work for validation / improvement)

- With release 14 simulation
- Calibration hits method for EM calibration
- Detector description
- “final” ID description (note that the amount of material has significantly changed compared to release 12 nominal geometry)
- Description of dead material in barrel-endcap crack (cf talk by M.Thioye)
- Improvement in end-cap geometry description (cf talk by M.Fincke-Keeler)
- G4 simulation
- Define “best” G4 version / physics list /range cut for the full simulation  => *Atlas G4 optimization task force*
*(cf talks from Tancredi and Andrei at last LAr week)*
*(frozen showers, Atlfast-2 on the simulation side for physics events => a lot of work for validation / improvement)*

## Barrel-Endcap crack description

## Slide 8

## Material distribution for ID services 

- Material distribution for ID services

## This will go in the release

- - Distribution is not symmetric in !
- - Gaps, 4, 5, 11, 12, 13, and 14 have less material

- Note being written by Moustapha to document all this
- Should arrange some meeting with ID people to have their “blessing”

## HEC geometry improvement

## Slide 12

## Slide 13

## Be careful to preserve

- Calibration hits

## FDR-2

- (march-april 2008)
- Try to “emulate” LAr calibration physics stream (5 samples from single electron).
- Produce MC samples with ADC data for cells above threshold
- Exercise calibration algorithms that could run “easily” on express stream
- Pedestal shift, Noise in MeV, autocorrelation from random events
- Exercise more refined in-situ calibration algorithms (maybe outside FDR-2) ?
- Z->ee intercalibration from AOD
- Position alignment ?
- In real life, will take some time to analyse together with many other things before understanding all effects (upstream material vs intercalibration, etc...)

## Motivations

**Contribute to quantify the amount of material in front of the calorimeter with early data**

- Number and radius of γ-conversions

- E/p of high Pt electrons

- Energy flow of minimum bias events
*(ATL-LARG-PUB-2007-007)*

**ID based methods**

**ID & calo**

**EM calo based methods**
- Thanks to its high lateral and longitudinal granularity

- Electron shower shape

- &

-  Evaluate the potential of high p**T** electrons shower shapes to probe material before EM calo and assess its complementarity with traditional methods

- M.Kuna
- Study of material
- Upstream EM calo

## Possible strategy

- _Method :_ Compare EM transverse and longitudinal shower shapes with a reference
- _Leading idea :_   the more material, the earlier the shower starts and the more brems.
-  wider electromagnetic shower, especially in S1
-  bigger proportion of energy in S1

-  At the very beginning of data taking :
-  Use φ-symmetry of EM calo response : no input from Monte-Carlo              use data as the reference
-  Detect anomalies in material distribution using only the calorimeter
-  Complementarity with minimum bias events
-  Whenever possible (reliable MC and aligned tracker) :
-  Use MC as the reference
-  Complementarity with track variables (E/p, track fit quality, ****-conversions)
-  Determine the absolute amount of material and its radial position

## Impact of ID material: shower width

-  The material increase in the ID induces a shower enlargement in S1
-  In this case, the statistical significance of the deviation is S = (r-1)/ error ~16σ

- r = a/b = 1.095 +/- 0.006

-  Look at the shower shape in the shower core in S1

*** ******= [E(±3) - E(±1) ]/ E(±1) ***
***Where E(******±******n) = energy in ******±******n strips around the strip with highest energy***

## Sensitivity to matter between PS and S1 (2)

**b**

**a**

**r = a/b = 1.02 +/- 0.003**
**S = (r-1)/ error ~6****σ**

-  The energy fraction in S1 is sensitive to this 0.05X**0** material increase
-  The material added is 0.05*cosh(****) X**0**  we do see this trend!

**Example  for 1.0<****η****<1.1 **

- Look at the effect on the longitudinal development (energy fraction in S1)

- η

- Ratio of. frac. in S1 = a/b

**Energy fraction in S1**

**Generalize to every ****η**** **

- Extra material PS-S1: 0.05*cosh(****) X**0**

## Sensitivity to matter in cryostat (1) 

- |η|

**X/X****0**

- Sensitivity to matter in cryostat (1)

**Shower width in S1**

**b**

**a**

-  The shower width in S1 is sensitive to this 0.10X**0** material increase in cryostat
-  It is far enough from S1 to be seen, contrarily to material between PS and S1

**Example  for 1.0<|****η****|<1.1 **

- Look at the effect on the shower width in S1

- η

**Generalize to every ****η**** **

- Shower widening = a/b

**r = a/b = 1.03 +/- 0.004**
**S = (r-1)/ error ~9****σ**

- Extra material in cryostat: 0.10*cosh(****) X**0**

**Red: ********>0, ********=-********2****, ********2**
**Green: ********<0, ********=********2****,3********2**

## High pT electron shower shapes (e.g. shower width and longitudinal development) can be used with very early data to search for anomalous distributions of material before the calorimeter

Thanks to the high granularity of EM calo, these shower shapes are sensitive to material excesses...
... in the Inner Detector
Sensitive to the 0.1-0.4 X0 added material
the shower width is S1 is the most sensitive variable 

... just in front of the calo
Between PS and S1 (0.05 X0): the energy fraction in S1 is sensitive, but not the shower width (material too close from S1) 
In the cryostat (0.10 X0): the energy fraction in S1 and the shower width in S1 are equally sensitive

- Thanks to the high granularity of EM calo, these shower shapes are sensitive to material excesses...
- ... in the Inner Detector
- Sensitive to the 0.1-0.4 X**0** added material
- the shower width is S1 is the most sensitive variable
- ... just in front of the calo
- Between PS and S1 (0.05 X**0**): the energy fraction in S1 is sensitive, but not the shower width (material too close from S1)
- In the cryostat (0.10 X**0**): the energy fraction in S1 and the shower width in S1 are equally sensitive

- The mapping of the absolute amount of material will require more time/data
- Complementarity with track variables (E/p, track quality, ****-conversions)
- We need to study this further

## CSC note status

- EG-6 (calibration)
- Report by Claire. Detailed outline agreed with all involved people. Material taken from:
- Calibration work done for release 12
- Atlas detector paper
- EM calibration workshop + Lar note for calibration hits method and study
- Calo CSC notes
- Slowly progressing for most of them. Need to finish up soon
- This is not the end of the work but should be taken as a “snapshot” of the performances with releases 12/13 and would be very valuable for us