Monday June 3rd 2002 AIDA 2.2 WorkshopAlex Howard Imperial College London Slide 1 Implementation of AIDA within Geant4 for Underground and Space Applications

Monday June 3rd 2002

AIDA 2.2 Workshop Alex Howard Imperial College London Slide 1

Implementation of AIDA within Geant4 for Underground and

Space Applications1. Experimental configuration

a) Dark Matterb) LISA

2. Implementation

3. Output

4. Comments and Conclusions



UKDMC Experiment



LISA Geometry and Geant4 Images



GEANT 4• For both Dark Matter/Underground applications and

Space based experiments it is clear that simulations are required using Geant4.

• This will be an increasing requirement with high statistics in order to accurately model our detectors, therefore necessitating a stable and user friendly analysis framework.

• A basic implementation of AIDA has been incorporated within our Geant4 simulation for both a prototype system (see advanced example DMX in June release G4 4.1) and a LISA gravitational wave simulation – specifically looking at the cosmic ray induced charging rates of proof masses

• In addition, in order to produce high statistics an earlier AIDA implementation together with Lizard has been run extensively on the GRID (both GRIDPP in UK and DataGrid TestBed here at CERN) with > 300 jobs – surprising given Dynamic library constraints of Condor [see http://www.gridpp.ac.uk/news/]



Prototype Simulation: Full Lab Geometry



One High Energy event:

LXe

GXe

PMT

mirror

source



room elastic

inelastic outside

Neutrons



LISA/STEP• Gravitational wave experiment• STEP = test of the equivalence

principle• Both rely on floating proof masses

with no electrical connections prone to charging effects

from cosmic rays

However, charging rate is relatively low (~1 in 5000 particles)



LISA Geometry and Geant4 Images



AIDA 2.2 Implementation• Currently ongoing in the

framework of G4ComptonTest• Relatively straightforward,

although need for full-scale examples within Geant4 a benefit

• Need for stability definitely required/backward compatability

• Installation and update scripts a big bonus

• My own experience has mostly been with previous interface…



AIDA 2.2 Improvements• I’m very much a novice so my lack of

recommendations does not mean things are perfect nor that there’s a level of disinterest

• The interface seems okay, it is really in the analysis packages that development may be required

• Header files and their release as an advertised package helpful – within G4 release?

• File size compression • Recoverable files – batch jobs crashing…• Ability to add files together – particularly

important if batch/GRID running• Quality of output – graphical output directly,

malleable, postscript?



Conclusions• The implementation of AIDA 2.2 within G4

has been carried• There will be increasing need for analysis

packages and ease of creation of output files in the future with more and more complex simulations for both Dark Matter and Space applications

• There is an increasing amount of interest from both Space and Underground communities (workshop at Gran Sasso July 2nd specifically on AIDA 2.2 and G4). Communities that don’t have Particle Physics histories but will require sophisticated analysis techniques more in the future.

Documents

Monday June 3rd 2002 AIDA 2.2 WorkshopAlex Howard Imperial College London Slide 1 Implementation of AIDA within Geant4 for Underground and Space Applications