1. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois1 SAS Overview Overall Data Flow Sim/Recon –Gleam –Recon rewrites –Calibrations Level 1 Pipeline + Mirrors Science Tools Advertisement

2. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois2 Data Flow MOC IOC DPF Recon L1 DB SSC L2 DB Italian mirror French mirror MC Calibs Fully automated server, with RDB for data catalogue + processing state. Uses SLAC batch CPU and disk farms. Data recon + MC on disk. Abstract full- recon output into L1 DB for analysis Parts of L2 processing also automated

3. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois3 Instrument Simulations and Reconstruction CAL Detail Instrument data 3 GeV gamma interaction 3 GeV gamma recon

4. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois4 Processing Pipeline ~50 CPUs; ~50 TB disk by 2010 IOC Batch system Level 0 Level 1, diagnostics HSM Automated Tape Archive Level 0

5. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois5 Sim/Recon Toolset cvs – file version management CMT – package version management simulation package gismo – on its way out GEANT4 – on its way in Root – object I/O Gaudi – code framework Gleam TkrRecon, CalRecon, AcdRecon – test beam era versions; Rewrites being planned & executed vcmt – Windows gui glastpack+soap - Linux ssh – secure cvs access VC++ – Windows IDE gnu tools - Linux Root, IDL – analysis xml – geometry, parameters utilities applications Event Display

6. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois6 Goals for Gleam New flexible geometry –flight.xml + detModel –Handle EM1 (1x1), Calib unit (1x4), Flight (4x4) Calib may well include some simulation of beamline Expect to handle BFEM; maybe BTEM –Used in Sim, Recon & Event Display. Analysis? –Looking successful so far I&T group trying it out for EM1 Separate Sim, Digi & Recon –Separately selectable and configurable via jobOptions –Persistent I/O from each phase Root is the current choice Fully detailed output –Object I/O matches OO coding in sim/recon –MC allows for configurable output – user can specify which volumes are sensitive and PositionHit or IntegratingHit types –Separate trees for MC, Digi, Recon Logically connected as one dataset Separate branches for systems: MC, subsystems Can exercise conditional reads by branch –Expect to have a summary ntuple as well Derivable from the full tree

7. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois7 Output Structure MC TreeDigi TreeRecon Tree Summary ntuple McParticle McPositionHit McIntegratingHit TkrDigi CalDigi AcdDigi TkrRecon CalRecon AcdRecon need mechanism to link Recon Digi MC nice if it were external to either pair could also be used for cross-subsystem relationships talking to Riccardo/Toby about such a mechanism

8. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois8 Gleam Goals (cont’d) New Recon chains per subsystem –TKR well underway (subject of this meeting) –CAL just getting going again TKR+CAL for low energy measurements – TKR is sampling calorimeter Real clustering at low energies? Revisit leakage corrections, especially off-axis –ACD to get a facelift Use revised propagator to associate tracks to tiles (use extrapolated error matrix?) –Expect such work to be made much easier with the new output structures – access to all the detail we’ll need to understand algorithm performance –Gaudi allows for plug ‘n’ play operation of algorithms, so we can try out new ones easily. Have to make sure the recons are set up to exploit this! –Started planning on extensive test suites to follow performance as code evolves Tie to Release Manager – track performance vs Release via database

9. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois9 Cal ID Layer Tower Column x=y=50 mm Horiz pitch = 27.84 mm => Tower 10, Col 1

10. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois10 Xtal Threshold Threshold @ 2 MeV = 100 ADC: looks close. Might need more stats to understand cutoff.

11. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois11 Details of Subsystems Data Root output is imminent –MC & CAL already available for Digis –TKR should be appear within a day or two –ACD by end of week (we hope, if Heather has recovered!) We have proto Root macros for accessing new output files and doing some simple checking Have sample userAlg files for generating them (userAlg.cxx, requirements and jobOptions) Can demonstrate them this week

12. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois12 Calibrations Infrastructure –Starting to happen now (Joanne Bogart) –MySql db for metadata; xml, Root for storing parameters –Prototyping now on TKR hot/dead channels –CAL interested in getting on board early. First redesign of calibration classes happening. TKR –Hot/dead channels (Leon) –Alignment (Hiro Tajima) – should have substantial progress by end 2002 CAL (NRL, Bordeaux?) –Thresholds, pedestals, gains, light tapers –Charge injection –Using heavy ions in flight ACD –thresholds, pedestals, gains

13. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois13 Data Pipeline and Mirrors We are in the process of writing a spec for the pipeline now –Alex Schlessinger will write the server etc –Database is specified already – started from SLD experience Set up for flexibility – configure data per task so RealData and MC can both be handled See LAT-TD-0533 for database description Will augment db for handling server state We expect to have mirrors in 3 locations: –SSC – level 1 DB (summary ntuple needed for astronomy) –Italy – so far we have only had contact with ASI. ? –France –Don’t have input from LAT mirrors on what data to mirror Choices are Level 1 DB only; plus Recon; plus Raw Data Initial druther would be not to distribute raw data to ensure version control over Recon.

14. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois14 Science Tools Science Support Center is at Goddard –Well funded – will probably have ~12 people! –Their charter is to provide access to the public for analysis of GLAST data Our goal is to work with them on a single suite of tools –Joint LAT-SSC working group in operation for a couple of months now Have been fleshing out initial descriptions and requirements on the tool box http://www-glast.slac.stanford.edu/ScienceTools/tool_defs Public call for comments on the documents leading into the Science Tools Workshop @ SLAC June 12-14 Organized by Seth Digel (a Real Astronomer).

15. GLAST LAT ProjectTracking Software Week – Pisa – 20 May 2002 R.Dubois15 Communications Meetings –vrvs –Core – Wed 17:30; General Thurs 17:30; CAL – Wed 16:30; TKR/DSTF – Fri 17:30(alternating); DocTF – Tues 17:30 –All have minutes and slides posted from meetings –http://www-glast.slac.stanford.edu/software Mailing Lists –General – Softlist; Core – InfraSoftlist; TKR – TkrSoftlist; CAL – CalSoftlist; –“bug tracking” – HelpSoftList –Majordomo via Stanford. ICQ –Very useful for distributed group –Trillian for Windows; GAIM for linux seem best clients currently Monthly Code reviews