Simulation Review Outline Cast of Characters Simulation Code Road Map Simulation Code Inventory Plans Cast of Characters P.B.Armstrong J.R.Bogart G.R.Bower R.Cassell R.Dubois D.L.Flath A.S.Johnson A.P.Waite A.P.Waite 5 Aug 1999 LCD Simulation Tools

LCD Road Map Generator(s) stdHEP files fastMC (Root) Gismo Gismo Material Files Generator Files Track Momentum Resolution Tables Parameter Files (JAS) Geometry Description Files Parameter Files (Root) stdHEP files fastMC (Root) Gismo fastMC (JAS) ASCII recon ASCII raw data JAS parser Root parser Root parser JAS parser .lcd files Root files Root files .lcd files Root Analysis Full Recon JAS analysis A.P.Waite 5 Aug 1999 LCD Simulation Tools

Simulation Code Inventory (SLAC) Key l Fully implemented l Fully implemented (including PIC) l In progress l Not attempted l Twinkle in our eye! A.P.Waite 5 Aug 1999 LCD Simulation Tools

Gismo Still working with a copy taken over a year ago. The GLAST and LCD versions have diverged (architecturally at least) since then! Our improvements/modifications Remove generation truncation limit Fix assorted PDG errors u,d quarks swapped Higgs renumbered from 9999 to 25 Correct some B baryon masses Remove miscalculated looping limit (essential for background overlay) Outstanding Fix NaN problem in optimized Linux code (EGCS 1.1 compiler?) Fix debug problem in optimized DEC/OSF1 code (EGCS 1.0.3 compiler?) A.P.Waite 5 Aug 1999 LCD Simulation Tools

GismoApps Fixes/improvements incorporated Add a VXD cryostat Fix calorimeter layer encoding to avoid overflows Add north/south encoding for tracking hits Add a version number to the ASCII output file Fixes/improvements still required Realistic magnetic field maps All GismoApps code now stored/controlled by CVS GismoApps being used as a test-bed for Development Environment Controller (DEC) testing XML testing Serial Input/Output (SIO) testing A.P.Waite 5 Aug 1999 LCD Simulation Tools

Root and RootApps Joanne Bogart working on introducing XML ‘Keepers of the Flame’ are Masako Iwasaki and Homer Neal Homer has Root/RootApps running on a DEC/OSF1 platform Please see Masako’s talk for further details A.P.Waite 5 Aug 1999 LCD Simulation Tools

Geant and GeantApps Version 4.0.1 of Geant was released 19 July 1999 Dependence on commercial software No longer dependent on RogueWave (good) Only persistence model fully supported is Objectivity (unfortunate but not fatal) Dependence on free software CLHEP A variety of visualization schemes Cygnus Solutions ‘Cygwin’ environment (Windows/NT only) Trying to persuade SCS to support Geant centrally No LCD applications written yet! A.P.Waite 5 Aug 1999 LCD Simulation Tools

CLHEP (for Gismo) and CLHEP Class Library for High Energy Physics (CERN product) Three versions exist at SLAC CLHEP for Gismo as LCD took it over a year ago CLHEP for Gismo as used by GLAST today CERN’s official version LCD Gismo/GismoApps still uses the first version Geant requires the official version A.P.Waite 5 Aug 1999 LCD Simulation Tools

stdHEP Fermilab product Used almost exclusively in LCD to read and write generator files Out of the box, it does not support PIC libraries (needed by Root) Windows/NT (LCD/SLAC has hacked together its own version) A.P.Waite 5 Aug 1999 LCD Simulation Tools

XML and XMLApps We use many independent ASCII input files to Gismo, fastMC (JAS), fastMC (Root), etc. despite the fact that they often contain overlapping information. This style of ASCII input tends to be inflexible (to the extent that most of these programs have hard wired some constants rather than change the ASCII file format). XML provides a method to build an in-memory database of constants based on one or more flexibly defined ASCII input files. XML is becoming a standard. XMLApps is an application level library being written by Joanne Bogart to provide access to XML generated database(s). Joanne Bogart is predicting a week’s work to complete a single platform Gismo/GismoApps application running with XML/XMLApps (2/3 done already). Unfortunately the week doesn’t start until she returns from vacation. A.P.Waite 5 Aug 1999 LCD Simulation Tools

SIO (Serial Input/Output) What XML does for ASCII input files, SIO attempts to do for ASCII output data files ASCII output data files tend to be Bulky Information Lossy Inflexible SIO addresses these problems by providing A binary format (industry standard xdr format) A counted, self navigating layout Multiple I/O streams each allowing heterogeneous record types Enforced data versioning Tony Johnson is currently trying to read an SIO file generated from a Gismo/GismoApps application Could provide a solution for Geant persistency A.P.Waite 5 Aug 1999 LCD Simulation Tools

Short Term Plan (<6 months) Distribute! (~week(s)) Take the results of this meeting to create new detectors Incorporate all the technical fixes we know about Construct the simulation executables (Gismo but not Geant) Test Distribute code to collaborators Farm! (~month(s)) Transmit the output files to Penn. Tradeoffs Incorporate SIO? (probably). XML? (probably not). Realistic field maps? (probably not). How much testing? A.P.Waite 5 Aug 1999 LCD Simulation Tools

Long Term Plan (> 6 months) What we are targeting Adopt Geant (to replace Gismo) Carry forward our GismoApps code to GeantApps If XML didn’t make it into the Gismo round, adopt it now If SIO didn’t make it into the Gismo round, adopt it now (or come up with another solution to the Geant persistency problem) Incorporate realistic magnetic field maps Open questions Geant persistency model {your question here} A.P.Waite 5 Aug 1999 LCD Simulation Tools