BES Detector Description and Event DisplayⅢ

Zhengyun YOU, Yajun Mao

School of Physics , Peking UniversityJan.10th, 2006

Outline

What is XML;

BESⅢ Detector Description based on XML(GDML);

What is Detector Description;

Why we need Event Display;

BESⅢ Event Display Software -- BesVis;

Highlights in BesVis;

Part Ⅰ

Part Ⅱ

Part Ⅰ

Detector Description

Detector Description in BESIII Offline Software

GEANT4 GAUDI ROOT

BOOST BOSS

Detector related informationgeometry, material, structure…

Eve

nt

Gen

erat

or

Det

ecto

rS

imu

lati

on

Rec

onst

ruct

ion

Ph

ysic

s A

nal

ysis

Ph

ysic

s A

nal

ysis

Eve

nt

Dis

pla

y

XML (eXtensible Markup Language) is an industry standard tool.

XML has great power in auto-distribution and data exchange over platforms.

XML document

Same content Different formatstandard

auto

What’s XML?

A Simple Example With XML

<?xml version="1.0" encoding="UTF-8"?>

<gdml xsi=“/scratch/youzy/gdml/gdm_1.1.xsd”>

<material name=“air” … … > <material name=“Iron” Formula=“Fe” Z=“26.0” D=“7.84“ … >

<solid box=“world” x=“1*m”, y=“1*m z=“1*m” ><solid box=“layer” x=“0.5*m”, y=“0.8*m” z=“0.1*m” >

<volume name=“logLayer” solid=“layer” material=“iron”

<child name=“layer2” volumeref=“logLayer” pos=“…” rot=“…“ /child>

<child name=“layer3” volumeref=“logLayer” pos=“…” rot=“…“ /child>

<volume name=“logWorld” solid=“world” material=“air”>

</volume><setup name =“det” world ref=“logWorld” /setup></gdml>

airiron

<child name=“layer1” volumeref=“logLayer” pos=“…” rot=“…” /child>

BESⅢ Detector

Mdc

Tof

Emc

Muc

OthersMagnet, Beam Pipe...

BESⅢ Sub-detectors by XML

Mdc (18,324 Nodes)

Muc (16,071 Nodes)Emc (12,806 Nodes)

Tof (643 Nodes)

BES Detector Description based on GDMLⅢ

Geometry, Materials, Alignment…

Classes for Simulation

GDML description

Classesfor Reconstruction

Classesfor Event Display

RO

OT S

chem

aROOT Schema

GDML writer

GEANT4 Schema

GDML (Geometry Description Markup Language) is a kind of XML, developed by GEANT4 group.

We expand its GEANT4 Schema and developed a new ROOT Schema for BES applications.Ⅲ

Automatically

XML document

Advantage of Using XML

GDML description

Simulation

Reconstruction

Event Display

1. Single source for all applications

3. Data exchange over platforms

2. Auto distribution

Part SummaryⅠ

Next stage will focus on Reconstruction in other sub-detectors and alignment;

XML Detector Description has been well used in simulation, event display of all sub-detectors and Muc reconstruction;

Part Ⅱ

Event Display

Visual check of sub-detectors

Visual check of hits, tracks

Improve recon. eff., ghost, mis-ID

Propaganda

Visual check of hits-track association

Why we need Event Display

Object Oriented, C++, based on ROOT and GDML, independent of BOSS;

Start from Oct, 2005;

First version released;

Developed by Peking University;

BES Event Display Software -- BesVisⅢ

BesVis – Friendly User Interface

BesVis – Display Mode

XY + ZR

XY

ZR

3D

All

BesVis – Details Control

BesVis – OpenGL and X3D

OpenGL X3D

BesVis – Lots of Functions

Event

Detector View Control

Hot KeysUser favorite style

Dst

BesVis – Highlights ( )Ⅰ

XML Detector Description : from XML : consistent; from ROOT : fast;

A new BESⅢ Event Display software, based on investigation of many other experiments :ZEUS, CDF, PHENIX, ATLAS(Fast), Babar, STAR, CMS, LHCb, CLEO, BESII …

Newly developed 2D geometry system :

+ =

New nice style :

BesVis – Highlights ( ) -- InteractiveⅡ

BesVis – Highlights ( ) -- AnimationⅢ

J/Ψ-> μ+μ-

Part SummaryⅡ

New functions to be added : Display of MC truth; Event selection and save; ……

Event Display Software has basic functions and could be used;

Thank you!

BESⅢ Sub-detectors by XML

Mdc (18,324 Nodes)

Muc (16,071 Nodes)Emc (12,806 Nodes)

Tof (643 Nodes)

BesVis – Highlights ( ) -- AnimationⅢ

J/Ψ-> μ+μ-