GAUDI Muon Software

Algorithms : MuonDigitization

MuonL0Trigger

MuonIdentification

Detector Description Database

Transient Detector Store

Detector Data Converters

24/11/99 Paul Colrain, Miriam Gandelman LHCb SW week Nov 99

The MuonDigitization Algorithm

• Analysis

• Design

• Implementation

• Results : Comparison with SicB

• What next ?

Problem Statement

Data Flow Diagram

Problem Solution

Object Diagram

Class Diagram

Sequence Diagram

Problem Statement :Q. What does it do?

A. Performs the digitization of the Muon Detector. Same functionality as SICB.

Q. What data does it take as input?

A. MC hits in the Muon detector (entry, exit, TOF, deposited Energy).

Q. What data does it produce?

A. Raw hits in the Muon Detector (pad/strip id, time stamp, pointer(s) to MC hits).

Q. Are there constraints?

A. Yes. 1. GAUDI and

2. The Muon Detector design.

ie. The Muon chambers will be of 2, 3 or even 4 different technologies (RPC,

DRPC, CPC, WPC, WSC) and have 2 different designs (pads and strips).

=> at least 2 different digitization implementations => “polymorphism”

MuonDigitization : Analysis

Transient Event

Data Store

Transient Detector

Data Store

create layer hits

perform coincidence logic

Job Options

file

MuonDigitizer

MC Hits

Raw Hits

Algorithm properties

database

MuonDigitization : Analysis

Data Flow Diagram

Algorithm properties

geometry, response data, . . .

layer hits

layer 1

layer 2

layer 3

layer 4

layer hit

1 chamber containing 4 pad layers :

charged particle trajectory

3 of 4 majority logic raw hit produced

charged particle trajectory

MuonDigitization : Analysis

Problem Solution (simplified) :

• Initialization

• Execution

• Finalization Delete all Chambers

Construct a list of those Chambers to be digitized

LHCb has 5 Muon Stations. Each Station has many Chambers.A Chamber can access its own MCMuonHits event by event.A Chamber has a list of RawMuonHits (initially empty).A Chamber can access its technology, structure, geometry, response, noise, cross-talk….A Chamber has the ability to digitize() its own MCMuonHits to produce RawMuonHits.

register() RawMuonHits by Station in the Transient Event Store

Inform each Chamber of its MCMuonHits

Iterate over all Chambers in the list

digitize() the MCMuonHits in each Chamber to produce RawMuonHits

add electronic noise hits

MuonDigitization : Design

CPC 2

CPC 1

WPC 3

MuonDigitizer

Transient Detector Store

Muon DetElement

Station 1Station2

Layer 2

Layer 1

LayerHit LayerHit

Object Diagram

RawHitSet

RawHit

Transient Event Store

RawHitSet1

RawHit

MCHitSet

MCHit

GAUDI

Private

Algorithm Data

Algorithm

IAlgorithm

MuonDigitizer

Stationdigitize()

Chamberdigitize()

CPCdigitize()

WPCdigitize()

WSCdigitize()

Layerdigitize()

LayerHit

RawMuonHit

MCMuonHit

ContainedObject

RawMuonHitSet

MCMuonHitSet

DataObject

MuonDetElement

DetectorElement

5

0..*

0..*

0..*

1

1..* 0..*

1

0..*

MuonDigitization : DesignClass Diagram

delete

retrieveMCHits()

retrieveMCHits()

retrieveObject()

new

retrieveObject()

delete

registerRawHits()

digitize()

retrieveMCHits()

configure()

finalize()

execute()

delete

registerObject()

digitize()

digitize()

new

initialize()

MuonDigitizerEventData

ServiceWPCCPCStationDetectorData

Service

MuonDigitization : Design

Sequence Diagram

retrieveObject()

retrieveObject()

SICB v115

GAUDI

MuonDigitization : Comparison with SicB

Muon Station 5 pad X v Y

?

MuonDigitization : What Next?

Upgrade : use new version of GAUDI

Review of Design and Code by GAUDI team

Include detector response simulation for each technology

(Detector Description Database)

Muon GAUDI Software : What Next?

MuonL0Trigger : Start Design early next year

MuonIdentification : ??

(Wait for ‘final’ Trigger HW architecture)