Simulation tools for Upgrades

NLO pQCD (W. Vogelsang)CTEQ6M5, DSS FF

pp @ 200 GeV ||<1.0

q,g jetsDirect

Fragmentation (assume RAA = 0.2)

JetsPhotons

0

Counts per 2.5 GeV bin in 50B AuAu Events

Colorado

Super Phenix

Boulder

Alex, Alan, Chris, Dave, Hugo, Martin. Matt

Boulder Colorado

March 13, 2010

2010

Geant

Congratulations it’s a …. simulation

Babies first X-ray (Simulation flow)

PHPythia/PHHijing

Geant 4

Response

Reconstruction

Input Particles

Geant Hits

Detector Hits

It’s a real chain: Status can besaved on a file at any point

Detectors under studyimplemented as activevolumes – granularity isapplied later in response. Run Geant once, and thenplay with detector layoutnoise, resolution, etc.

We can overlay multiple eventsat input or geant hits level

Phool Node tree

Root File

Nice plan, but ran into problemswhen dealing with showers

Babies first drawing (B=1T or so we thought)

Single pion Pythia

Rendering bug

EmCal

Si

(Geant4 default physics processes)

Pythia

GEANT4: Q-Pythia Dijet Event

One month old @ Columbia

Single +

Nine months, Geant4 + patch01/02

Basically Super Phenix is still in its infancy

Atlas sims @CHEP 2010

7

Reconstructed secondary vertices due to hadronic interactions in minimum-bias events in the first layer of the Pixel detector(sensitive to interaction length λ complementary to γ conversion studies)

Vertex mass veto applied against γ ee, KS0 and Λ

Vertex (R, Z) resolution ~ 250 μm (R <10 cm) to ~1 mm

φ φ

Data Simulation

Pixel module

Cooling pipe

Cables

C-fibershell

Bin size: 250 μm

Already very good,

but can be im

proved !

Atlas@ICEP2010

LCG Simulation Project

E. Garutti: LCG Phy. Val. meet. 10 June 2009

CALICE Preliminary

Hadronic showers http://lcgapp.cern.ch/project/simu/:

Report at LHCC comprehensive review , Feb 2010

What do we have now

• The same as we had in April (with newest G4 patch from Sept 2010)

• Implement your own – no problem as long as it’s a perfect cylinder or a rectangular box and made of standard materials

• At least it’s modular and integrated into our software framework, so you can easily include/drop detectors on a macro level

•Make it a model for next generation phenix code• Use only a subset of PHENIX code• 64 bit from the beginning• Database for material/geometry• New root version•Tap into all the work which has been done for LHC (e.g. interface to event Generators, geometry for embedding)•Investigate grid computing•basically avoid all mistakes we made with our previous sims

Todo

Geant4 is not your old so-sowhatever simulation tool anymorewhich can be ignored because youknow better. It will help us to makeinformed decisions about ourdetector design