1. 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

2. 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

3. 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

4. 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 compiler?)
A.P.Waite
5 Aug 1999
LCD Simulation Tools

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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