An Overview of Atlantis

Andy Haas
Columbia U. / Nevis Labs

ATLAS @ BNL

May. 24, 2006

Team Atlantis:

Introduction

Displays are needed in various ways at different stages of the experiment:

Software development: understanding offline & trigger algorithms

During commissioning: cosmics, cabling, noise

Data taking: online monitoring, offline monitoring, weird problems

Physics: understanding event topologies, backgrounds processes

Outreach: picture of SUSY for the front page of the New York Times!

Atlantis was born from DALI, a very successful display, from a very successful experiment, ALEPH

Overview

Atlantis is 2D (for now...)

Multiple “data-oriented projections” :
XY, eta-phi, RZ, Lego, etc.

Loosely coupled to Athena

Athena ->JiveXML (C++) -> XML files

XML files -> Atlantis (Java)

XML “files” can also be XML “pipes” for online monitoring

Can also be run interactively with Athena

Strong support team (~8 FTE)

Very flexible configuration options

Runs on all computing platforms (Java)

Understanding the Detector and Reco

Reconstructed calorimeter objects (electrons, photons, jets, MET, etc.) and associations to cells in very clever ways

jet, elec. / photon, tau

reco. & trig.

Histograms of cumulative energy

Tracks, pixel/sct/trt hits, vertices, MC inifo, cal. cells, muon hits, muon segments, muon tracks

Pick objects for detailed info

Can zoom / pan / rotate / fisheye / cut / stretch / etc...

Multiple views at once in windows

Syncrocursors between the views

Lots of Options...

Atlantis v-plot for LArg

Match of electron to each calorimeter layer

Can see response / geometry in each layer

Can also display details of calorimeter clustering algorithms / jets / matches to track jets, etc.

Presampler

Layer 1

Layer 2

Layer 3

eta - phi

Cell clustering in Atlantis

Cells colored by cluster (Area  E)

Jet (Area  E)

E= 13 GeV

E= 347 GeV

Details of cell

clustering

AOD's – Reco-level Information

Draw reco objects from AOD's

Jets

B-jets

Tau-jets

Particle-jets

Electrons

Photons

Muons

Various mET

Can place cuts on these objects

ET

Significance

Isolation

etc...

electron
(in b-jet)

b-jets

mET

particle jets

Cuts, AOD Info

Test Beam

Trigger

Tricks for Understanding Events

Online Operation

Interactive Athena / Atlantis

Interactive Athena / Atlantis

Summary

Atlantis is a widely used, highly evolved, fully featured event display

Aims to fulfill most needs of ATLAS

Displays nearly everything we can think of

Very flexible: can make pictures with incredible complexity and detail or great simplification

Insulated from ATLAS software: standalone XML events and geometry

But can be interfaced tightly:
- interactive Athena use
- online event display

Java makes it easy

Andy Haas

2004-07-07T15:59:13