3 Feb. 2006Shuei YAMADA 1 MEG Software MEG Software Group.

3 Feb. 2006Shuei YAMADA 1

MEG Software

MEG Software Group


Contents

Summary of Software Meeting (3-4 Nov. 2005)Standard Operating SystemTransition to SubversionROME based analysis tools

Status of SoftwareSoftware OrganizationStatus of Monte CarloStatus of Offline Software

Ongoing Studies Using MCResources and Needs

CPUDISKNetwork

Schedule and Manpower


Summary of Software Meeting (3-4 Nov. 2005)

Standard Operating SystemScientific Linux (SL)

Mostly used in the HEP communityDerived from RedHat Enterprise Linux, Freely available

Transition to SubversionA concurrent versioning system, similar to, but better than CVS

Truly atomic commit (CVS: file-by-file)Moving/renaming files and directories (CVS: loses history)

Free/Open source version control systemRuns on all modern flavor of Unix, Mac & Win2k/XP

Binary package available for SL3/4


ROME based analysis tool

MegRoot was rejectedAnalysis tools based on ROME was approved

megbartender : event cocktail & digitizationmeganalyzer : reconstruction & event display

Both for online & offline

New software coordinationRepository : Fabrizio Cei, Shuei YamadaMC : Fabrizio Cei, Shuei YamadaOffline : Matthias Scheebeli, Ryu SawadaOnline : Stefan Ritt


Status of Software

Software OrganizationMonte Carlo StatusOffline Software StatusOngoing Studies Using MC


Software Organization

Simulation

DC H. Nishiguchi

TC P. Cattaneo

XE F. Cei + S. Yamada

Beam/Target W. Ootani + K. Ozone + V.

Tumakov

Calibration F. Cei

DC digitization P. Huwe

TC digitization P. Huwe

XE digitization Y. Uchiyama

Trigger simulation D. Nicolo’ + Y. Hisamatsu

Analysis

Framework M. SchneebeliDatabase R. Sawada

DC H. Nishiguchi + M. SchneebeliTC D. ZanelloXE G. Signorelli + R. Sawada


Procedure of Analysis

GEM

ZEBRA

bartender

analyzer

ROOT

MC simulation event generation detector simulation

Electronics simulation

event cocktail waveform simulation digitization trigger simulation

DAQ

MIDAS

ROOT

simulationexperiment

Reconstruction Event display


Monte Carlo Status

GEANT3 based simulation program : GEMProgram built around the framework REMOrganization in modules, as an OO class; structured like:

xxx (prefix of specific device) = dch, ticp, ticz, xec … yyy (suffix defining the functionality) = ini, set, end, draw, …

Documentation under SVN in meg/rem/docInteractive GEM

Call GEANT3 functions interactively to Draw geometry, track and hitChange the running conditions

To be done:Learn how to use itImplement user interface (kumac and/or GUI)


Drift Chamber

ProgressImproved integration of time to distance profile from GARFIELD GEANT simulation of Vernier electrode patternsImproved hit structure

More adequate description w/ low-E -raysSimple and small hit data structure (220 → 8 words/hit)Efficient (80 →100%) and simple hit cell# calculation

To be doneEffect on signal of Vernier patternsImprove detail of material : electronic cards, cables, …


Timing Counters

Progress:Implementation of many geometries : cables, jacket, bars w/ slanted ends, square fibers, PMTs, APDs, …Preliminary support structureGeneration and propagation of scintillation photons : based on analytical calculation & Poisson fluctuations

To be done:Improve details of materials and support structureImprove photon propagation modelCross check w/ beam test data (for counter)


Liquid Xenon Calorimeter

Progress:Geometry almost finalized

Inner&Outer vessel, PMT holders, PMT position, Honeycomb,…

Faster GEANT based optical photon tracking : (~10s/event on 3GHz Pentium4, ~ 7.5s/event on 2.4GHz Athlon64)

To be done:Implement final geometry : Dense PMT layout for backside, hollow spacer for L&R sideFast optical photon tracking


Beam and Target

Progress:Muon beam simulation based on phase space into event generatorElliptical tube option for targetImplemented end cap and Rohacell insertion tube

To be done:Implement Beam Transport SolenoidComplete the beam transport within the detectorImplement final target with support3D Field map + interpolation


Calibration

Extensive work in the pastPartially implemented in MC

Progress:Geometry and tracking media almost completedEvent generation under testing

To be done:Test and commit event generatorComplete implementation of geometry

Ni plates outside Ni plates outside LXe calorimeter LXe calorimeter (neutron calibration)(neutron calibration)


MC General Conclusion

Simulation status satisfactory :good level of sophistication in geometry and physical process simulation.Further refinements in geometry under way. Simulation of calibration procedures started.Some people (5 - 6) actively working. It’s a good time for testing the mass production(possible problems with disk space, memory management…)


Offline Software Status

Single Event DisplayPreliminary mu -> e+gamma trigger simulationWaveform simulation & digitization

XE & DC : readyTC : preliminary

Analysis Extensive works by individualsPartially implemented in meganalyzer :

XE : Fast reconstruction (Qsum, position,…), Position reconstruction DC : preliminary track fit (for online display)


Single Event Display

ROME and ARGUS are mergedBoth for online & offlineROME runs in 3 modes

ROME stand aloneArgus stand aloneROME with Argus display (new mode)

Configuration in the ROME configuration fileNo special user code needed


QT movie…


Ongoing Studies Using MCBG Source Study

Optimize end cap ,target system and Rohacell tube design

AIF events in LXeSource of AIF gammasAIF gammas’ spectrum & yieldAIF Rejection

LXe WaveformWaveform simulationPile-up rejection


BG Source Study

New featuresOptimize end-caps

Upstream End-cap

Rohacell Insertion Tube

Optimize target system

Purpose

beam

DC cable duct

Michel decay


BG from End Cap

39 photons / 50,000 Michel e+

Designed end-cap

(Aluminum part)

+

SUS Beam Pipe

beamMichel decay

Aluminum

SUS

Bremsstrahlung photon


BG from Rohacell Tube

3 photons / 50,000 Michel e+Bremsstrahlung photon

Rohacell X0 = 820cm density = 0.052 g/cm3

C9H13O2N


BG from DC cable duct

427 photons / 50,000 Michel e+

beam

Michel decay

Carbon fiberAluminumCu cable

Bremsstrahlung photon


BG Source Study(1) Summary

BG SourcesEffect of cable ducts was improved down to 1/2Bremsstrahlung & Annihilation at rest

Effect of end-cap is relatively smallLow E ( ～ 1MeV), but pile-up study is needed

AIF studytarget & Rohacell tubeCable duct

Target studySlant angle of the targetComplete target support structure & calibration system

Energy deposit in LXe [MeV]


AIF study using MC

1. Generate Michel e+ in target, emit them for 4π

2. At the each GEANT tracking step, calculate annihilation probability 　 by material information and Michel e+ momentum information

3. Generate 2 γ at each step weighted by this probability

4. Trace 2γ , if it enters Xe cryostat


AIF probability map

X-Y View Z-Y View Z-X View

No

Cut

Xe e

vents

Xe eventsEgam

> 45MeV


AIF Spectrum & Photon Yield

AIF spectrum and their origin

Egam MeV/52.8MeV Egam MeV/52.8MeV

Photon yield per muon decay


AIF Event Rejection in LXe

Different arrival times of 2 gammasDifferent Impinging points

TODO : Pattern recognition

δT2gamma [sec]

δX2gamma [cm]


LXe Waveform

Waveform SimulationPile-up rejection

Take sum of PMT outputsLarger pulseMicrostructure in pulse shape disappear

Optimization for # of PMTs to be summedSumming up all the PMTs not good from S/N viewpoint


Xe Waveform Simulation

1. Sum up Gaussians over all photo electrons• Mean = arrival time of each photon• Width = TTS (1 p.e. response)

2. Shaping (Low Pass Filter)• Low Pass filter• Time constant RC = 5nsec

Fits very well with real pulse !


Pulse Shape Fluctuation

Pulse shapes are not constant especially for small pulses

0.6V

datasimulation simulation

1.2V

data

deviation

Fluctuation reproduced


Pile-up finding

T=50ns. T=15ns

11MeV + 42MeV

Peak searchCount # of peaks in Moving averageSimple but powerfulfor large T

DifferentialCount # of peaks in DifferentiationPowerful for small T


Rejection Efficiency

(E 1 + E 2

)/52.8MeV

Optimal Value : 60 ~ 70% of QsumFunction of Energy


Rejection Efficiency

T 8ns

T 10ns

T 15ns

T 50ns

T 100ns

As functions of Energy of each and TSummed up to60% QsumMisidentificationprobability: <0.05%

Weak points:T < 10nsecSmall pulse aftera large one


Resources & Needs

Data storageCPU PowerData Access


Data Storage Resource & Needs

PSI Tapes PSI Disks MEG Needs

30-40 TBytes (free) +

40 TBytes occupied by back up (to be freed)

4TBytes (backuped)+

6TBytes(not backuped)

～ 10TBytes/yr (read data)～ 40-50TBytes/yr (MC Production)～ 10TB/yr (overheads, DSTs)

total 70-80 TBytes 10TBytes 60-70TBytes/yr

MEG Needs ～ 5 TBytes/year of Disk Space for DATAAssuming 1/2 of the data collected in one year reside on disk for monitoring, calibrations, faster analysis, etc…


CPU Resource & Needs

PSI Nodes MEG Needs (CPUs/yr)

64 ～ 3 CPUs (real data, w/o Waveform fitting)< 1 CPU (selected data w/ Waveform fitting)～ 20 CPUs (MC production & bartender)～ 10 CPUs (MC reconstruction = 3x data, w/o WF fitting)< 1 CPU (MC selected sample w/ WF fitting)

Total 64 CPUs ～ 33 (+20 per 10 repr.) CPU/yr

128 CPUs

128 CPUs


Data Access Resource & Needs

PSI Link Speed MEG Needs

25MBytes/s to tapes via FTP1Gbits/s to disks from CPUs

～ 1MBytes/s (w/ Waveform compression)～ 10MBytes/s (w/o Waveform compression)

OK !


Schedules and Manpower

MilestonesManpower


Milestones

Within 2-3 weeksNew PSI cluster partly ready : 128 OpteronsMC mass production (at least signal events and Michel positrons)

Start development of reconstruction & Pattern recognition algorithmsStart pre-selection study

By end of SeptemberFinish MC mass production

Signal, Michel positrons, backgrounds…


Schedule for LXe analysisOther sub-detectors can emulate LXe schedule


Man Power

2006Q1Y. Hisamatsu 0.5H. Nishiguchi 0.2W. Ootani 0.1K. Ozone 0.5R. Sawada 0.5Y. Uchiyama 0.7S. Ritt 0.1M. Schneebeli 0.4F. Cei 1.0G. Gallucci 1.0D. Nicolo’0.2A. Papa 0.3R. Pazzi 1.0G. Signorelli 0.5P. W. Cattaneo 0.5D. Zanello 0.5A. Barchiesi 1.0W. Molzon 0.2V. Tumakov 1.0S. Yamada 1.0P. Huwe 1.0F. Xiao 0.7

Total 12.9

2006Q2Y. Hisamatsu 0.5H. Nishiguchi 0.3W. Ootani 0.1K. Ozone 0.5R. Sawada 0.5Y. Uchiyama 0.7M. Schneebeli 0.8F. Cei 1.0G. Gallucci 1.0D. Nicolo’0.2A. Papa 0.3R. Pazzi 1.0G. Signorelli 0.5P. W. Cattaneo 0.5D. Zanello 0.5A. Barchiesi 1.0W. Molzon 0.2V. Tumakov 1.0S. Yamada 1.0P. Huwe 1.0J. Perry 0.7D. Stute 0.4F. Xiao 0.5

Total 14.2


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3 Feb. 2006Shuei YAMADA 1 MEG Software MEG Software Group.

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