PHENIX Simulation System1

Software@BNL July 7, 1999

Simulation Progress and Simulation Progress and ROOT-in-PISAROOT-in-PISA

Charles Maguire

Vanderbilt University

July ‘99 Software Meeting

PHENIX Simulation System2

Software@BNL July 7, 1999

Recent ProgressRecent Progress Upgrade of WWW documentation

PISA Primer Manual Version 4.0 Self-contained introduction to PHENIX and software for the utter novice Available in HTML or PostScript form (bound volumes sold-out)

New Event Generator WWW pages Includes VNI vs HIJING comparisons Participation in OSCAR II in order to update event generators

Developed PRDF event mixing prototype More discussion in following talk

Embarked on ROOT I/O learning curve Successfully read/wrote BBC ZEBRA/O-O data structures !

PHENIX Simulation System3

Software@BNL July 7, 1999

ROOT-in-PISA DevelopmentsROOT-in-PISA Developments

Null Experience with ROOT I/O & Classes Began learning curve in early June Saw existing GEANT-to-ROOT model gh2root

First run F77 exe to convert ZEBRA data structures to ROOT objects ROOT objects based on standard GEANT data structures ROOT objects converted to detector hits based on knowledge of

GEANT geometry tree in Off-Line framework (GFHITS calls) Not well-matched to current PHENIX model

Pushing the ROOT envelope Want to write directly a ROOT file from PISA

Saves F77 conversion step; decouples GEANT tree from PHOOL Requires mixing of F77, C, and C++ classes, and a motley crew of

various libraries who need to be tamed

PHENIX Simulation System4

Software@BNL July 7, 1999

ROOT-in-PISA DevelopmentsROOT-in-PISA Developments Pushing the ROOT envelope

Learned Event example in ROOT Introduces ROOT I/O Trees Good mapping between ROOT Tracks Class and new PISA Hits Class Allows internal historgramming browsing equivalent to external

software written for STAF browsing of PISA hits files Teaches one how to incorporate user classes inheriting from ROOT classes

Developed BbcPISAEvent class Prototype of all detector subsystem classes for PISA events Wrote stand-alone program to read existing PISA hits file from MDC

Taken from DIO with all references to STAF software removed ZEBRA data structures are READ and Event objects are WRITTEN

Write components will now be transferred into PISA Stand-alone program mixes F77, C, and C++ source files and libraries

Demonstrated to work on Linux and DEC Alpha platforms

Developed PGF77-free version of PISA on Linux Needs correct match of CERNLIBs (only “new” 98 works)

PHENIX Simulation System5

Software@BNL July 7, 1999

Schedule and SummarySchedule and Summary ROOT-in-PISA to be ready by July 30

Aggressive scheduling to keep edge Includes writing of PISA ROOT files and

reading of these files in PHOOL framework to make PRDFs Aim to be as transparent as possible

for subsystem programmers Will support all existing Simulation functions now in STAF

including event merging and ancestry tracing PISA make file with be PGF77 free by July 30

No need to build your own, they all exist on AFS at RCF ! PRDF merging as per following talk results 3D magnetic field map by August 30