1. ALFA & its Simulation in the Athena framework status 29.11.2010
Tom Sýkora
on behalf of the ALFA soft-sim group
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

2. ALFA detector – positions
first “track candidates” observed (K. Korcyl, M. Heller)
our ROD and ROS are now part of that ATLAS DAQ the first data file recorded in ATLAS DAQ through the ALFA ROD
pot installed
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

3. ALFA packages – release status
in the nightly release 
together with FPTracker
full documentation – on the way
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

4. ALFA_BeamTransport – new schema
Daniel Pelikan
beam
ATLAS cavern
ZDC volume
ALFA volume
? (AFP)
Transport
Andrea Dell’Acqua (from his Forward Detectors meeting transparencies):
My proposal is to:
Set up a Geant4 parameterization scheme for the forward regions
Control is given to an external handler as soon as particles enter the forward volume
Utilize G4 tracking to the end of the ATLAS cavern
FP(N)Track will kick in and transport particles to the front face of the detector where accurate G4 simulation can be restarted
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

5. ALFA_BeamTransport vs MADx – elastic case
Daniel Pelikan
comparison made before entering the first station (i.e. on ~ 240m)
difference σ ~ 12μm
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

6. ALFA – FPTrack vs MADx – diffraction
Maciej Trzebinski
expected – a good agreement
MADx
FPTrack
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

7. ALFA_BeamAnalysis – from elastic to single diffraction and further
Daniel Pelikan
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

8. Test Beam (TB) data in Athena
Sara Diglio & TS
bytestream
bytestream converter
ALFA_RawData
filler
missing step
ALFA_Digit
ALFA_Reconstruction
byte-stream converter & data class – Athena ready
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

9. ALFA detector – positions – survey
Dieter Notz
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

10. ALFA Geo Model – detector alignment & positioning
Libor Nozka
position of the detectors from survey measurement
function for detector movement
influence of rotations and shifts – comparison with TB09 & TB10 data
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

11. pot position in station CS
Libor Nozka
measured two points RPPin1 and RPPin2 –
additional constrain need: bend measurement by SYLVAC probes
additional step in simulation: internally RPPins positions recalculated to pot‘s main point origin as the pot is rotated to its main point (artificial one) - transformation matrix is set-up accordingly
Dieter Notz
RPPin2
RPPin1
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

12. detector position in pot CS
Libor Nozka
measured two points DetPin1 and DetPin2 w.r.t RPPin1
additional constrain need: tilt measurement points – rotation around z-coord.
additional step in simulation: internally detector is placed in pot’s main point so DetPins positions are recalculated to this point origin (artificial one) - transformation matrix is set-up accordingly assuming RPPin1 position by metrology
Dieter Notz
DetPin2
DetPin1
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

13. ALFA local recontruction
Petr Hamal
B7L1
A7L1 z IP x y
A7R1
B7R1 2 1 3 4 5 6 7
beam 1
beam 2
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

14. ALFA & its Simulation, status, ATLAS Software & Computing Workshop
summary
ALFA_GeoModel is under the continuous development
full station survey, pot movement – implemented, testing & validation are ongoing
simplest digitization works for MD & OD using the same digitization process
still missing – efficiency, cross talks etc.
local reconstruction
multiple tracks (Matthieu Heller)
improved algorithms 2D, 3D…, algorithm comparison
global reconstruction, momentum reconstruction – will come soon
visualization of ALFA in VP1 – parametrized volumes, new type of volumes in GeoModel
following muon example – xml, Andrea Dell’Acqua - an example, will he give a talk?, shall we follow?
Geant4 simulation of the forward region (Ladislav Chytka) – support from LHC (Simulation group & Forward detectors) will be needed/useful,
py script model – a better understanding needed – documentation?
ALFA included in Simulation py scripts – thanks to Andrea Dell’Acqua; more communication with Andy Buckley needed
ALFA in nightly release – thanks for the help to Emil Obreshkov and John Chapman
notes
TB09(10) vs simulation – P. Hamal, L. Nozka, M. Heller, T.S.
Transport of Protons with High Energy Loss Through the LHC Magnetic Lattice – M. Trzebinski, J. Chwastowski, T.S.
Forward Detectors member(s) in the Simulation group? What is an opinion of the Simulation group?
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

15. ALFA & its Simulation, status, ATLAS Software & Computing Workshop
question + numbering of releases + errors s
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

16. ALFA & its Simulation, status, ATLAS Software & Computing Workshop
the end
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

17. ALFA & its Simulation, status, ATLAS Software & Computing Workshop
presented (backup)
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop

18. full simulation flow geometry fibres, pots, stations
detector conditions
(run positions, beam, …)
metrology
GeoModel ATLAS & ALFA
elastic scattering
diffraction
beam conditions
generation
generator
simulation ATLAS
particle transport
IP  RPs
optic files
full simulation flow
simulation ALFA
hit, energy deposit
digitization
calibration
PE spectra
el. noise
digitization
energy  PE
test beam
data format
byte-stream conversion
stream
monitoring
reconstruction
online monitoring
data quality, gain monitoring
stream-byte conversion
x-y reconstruction
analysis
ESD, AOD, DPD
offline monitoring
alignment
(luminosity) analysis
steering or job option
production of “as real” data;
a bit artificial but serves to the consistency check
data
“as real data” simulation
packages
November 29-th 2010
ALFA & its Simulation, status, ATLAS Software & Computing Workshop