NICADD LCD Simulations: Capability Overview and Future Plans Guilherme Lima, Jeremy Mc. Cormick 6/23/2003
Current Process Overview Event Generation JAS, Pandora-Pythia std. HEP Detector Simulation Gismo SIO Analysis SIO File Server SIO File (remote) JAS Note: Each arrow represents a (probable) file transfer. 6/23/2003 2
Event Generation Single Particles • JAS Sing. Part. Gen class • typically electrons, pions or muons • helpful for debugging and results certification • typical single particles E = 2, 5, 10, 20, 50 Ge. V • fixed theta/phi or randomized within boundaries Complex Events • pandora-pythia (TAULA, Pandora, Pythia) • processes include E+ E-, Gamma, E- E-, E-(+) Gamma, Gamma E-, etc. • multiple processes 6/23/2003 3
Detector Simulation Gismo • std. HEP input with SIO output • C++ package maintained at SLAC--no longer in development (difficult to install and uses old and unsupported toolkits) • version 3. 1. 1 distribution includes CLHEP 1. 4. 0. 0, std. HEP 4. 06 and several XML libraries (icu, xerces, xml 4 c) Geant 4 Software • LCDG 4 and LCD-Mokka in beta or alpha. • Mokka is available for simulations and mutual results certification. 6/23/2003 4
Analysis • SIO files remotely accessible in JAS • wired display, MC Tree, MC Table and LCD Event • browseable database of SIO files • LCDROOT 6/23/2003 5
General Problems General Issues • CVS, messy codebase, lack of documentation, manpower and expertise, many simultaneous demands, unclear priorities… • utter lack of in-house design docs (“Road Map”) Geometry • XML limits customization of the detector geometries. • only idealized structures with limited utility beyond a certain LCD design phase Simulator Zoo • LCDG 4 local capability only (nicadd) with no certification study. • Mokka tested only on pre-defined detectors—non-working Mokka geometry drivers for XML input; LCD-Mokka from Ties has a Seg Fault in XML library. • Non-projective fork of LCDG 4 will be difficult to reintegrate into main trunk. Pipeline • perl and bash scripts plus manual command-line work (Ex. - sftp, ftp or scp for files. ) • Job submission, event generation and detector simulation have little to no User Interface outside of the command-line. • SIO catalog is manually updated and currently not up-to-date. • Analysis tools “hacked” to accommodate geometry modifications. 6/23/2003 6
LCDG 4 -related Problems Extending Difficult • limited by XML format • class structure is not well-designed • sensitive detector and geometry code requires an overhaul Codebase • no support for non-projective readout in main code trunk • CVS is a mess. • practically undocumented • misuses and recodes Geant 4 constructs • coding style, including indentation and variable naming, is inconsistent • unused code still compiled! Structural Problems • poor class design creates major redundencies and inefficiencies • supports only LCD XML file format • lacks a coherent long-term design plan and path 6/23/2003
Short-term Goals 1) LCDG 4 and LCD-Mokka mutual results certification for identical detector geometries 2) correct text output for LCDG 4 with simulated non-projective cell geometry in HCal 3) debugged LCDG 4 running on the Fermilab cluster 4) clean up LCDG 4 code: remove unused code, document, standardize on indentation and variable naming conventions 5) complete CVS reorganization/reconfig, dropping old versions from codebase 6) study Geant 4 toolkit to understand class structures, application scope and “built in” capabilities 6/23/2003 8
Midterm Plans • phase out Gismo for a Geant 4 -based simulator • coherent design document for a Geant 4 simulation package before the coding effort OR • drop LCDG 4 in favor of a more mature package such as Mokka • LCDG 4: class restructuring in SD and geometry, NP in Ecal, projective and non-projective geometries • modify JAS to easily analyze SIO files based on changeable geometry formats • plan & develop tools pipeline for LCD computing in all 3 phases • establish collaborative efforts with CERN and SLAC for LCD simulation tool development with Geant 4 • continue to work on UI for event generation and simulation tools • design better distribution and packaging system for NICADD LCD software and results files 6/23/2003 9
Ambitious Long-Term Musings • GDML: parsers and translators packaged with Geant 4 • XML format for LCD geometries should be based on low-level Geant 4 volume objects, which GDML mirrors. GDML does not currently include sensitive detector information, and this capability should be either added to the format or included in a separate XML file, connected to GDML volumes by ID tags. • STEP file input from CAD to test actual detector designs, also a Geant 4 “built-in” • translate XML/SQL formats to GDML via XSLT and relational mappings • full range of tower/non-projective simulation with cells as reflected volumes • XML-based application config file for flexibility • "hooks" for analysis/event-gen (Geant 4 has built-in eventgen and visualization capabilities) • flexibility in input and output formats and locations (remote would be nice) • simulator engine that can be run remotely via server commands (XML-RPC/CORBA/SOAP) • local computing cluster for pipeline automation • catalog and distribution system for software and simulation or event generation result files • Event Generation, Detector Simulation and Analysis tools must be powerful, flexible and configurable. • Would you build an LCD without blueprints? No. Similarly, producing good software usually requires a design phase. 6/23/2003 10
References • Pandora-Pythia: http: //www-sldnt. slac. stanford. edu/nld/new/Docs/Generators/PANDORA_PYTHIA. htm • JAS: http: //www-sldnt. slac. stanford. edu/jas/ • Geant 4: http: //wwwasd. web. cern. ch/wwwasd/geant 4. html • std. HEP: http: //cepa. fnal. gov/CPD/stdhep/ • SIO (now within LCIO): http: //www-it. desy. de/physics/projects/simsoft/lcio/ • Mokka: http: //polype. in 2 p 3. fr/geant 4/tesla/www/mokka. html • Gismo: http: //www-sldnt. slac. stanford. edu/nld/new/Docs/Gismo. Install. htm • LCDG 4: http: //nicadd. niu. edu/simulations/software/index. html • fbsng: http: //www-isd. fnal. gov/fbsng/ • Mokka & LCDG 4 Geometries: http: //nicadd. niu. edu/~jeremy/mokka-lcdg 4. html • LCD Simulation at NICADD: http: //nicadd. niu. edu/~dhiman/talks/lcdg 4_slac 03_030521. pdf • Mokka/LCDG 4 Comparison: http: //www-conf. slac. stanford. edu/lcsimworkshop/talks/mokka. pdf • GDML: http: //gdml. web. cern. ch/gdml/ 6/23/2003 11
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