Semester Project: Linear Collider Beam Test Data AnalysisPHYS 5326Spring 2007

Jacob Smith

The Small Picture Standard Model predicts

and arranges particles SLAC (Ψ/J) Brookhaven (J/Ψ) Argonne (very busy) Fermilab (top quark) CERN (Ws and Zs, Higgs?) Where does the mass

come from? (Higgs) Find @CERN, measure@

ILC High Energy Electron

Positron Collider Calorimetry requires

good (high) resolution

The Detector Race, SiD

Four Detector Concepts GLD Concept LDC-Large Gaseous

Tracking Sid-Silicon Detector

Concept A Fourth Detector

Concept Detector consists of

sectors for measurement of specific processes

Gas Electron Multiplier (GEM) calorimeter for the hadronic (HCAL) section

Gas Electron Multiplier Foils

GEM Foil Cu clad kapton Consists of small holes Electric field due to potential

difference across foil accelerates electrons from ionized gas

Charge amplification occurs in holes

Double GEM provides optimum gain

70m140m

Invented by Fabio Sauli/CERN

From CERN-open-2000-344, A. SharmaSection of 30x30 cm UTA GEM foil

Development of GEM sensitive layer

9-layer readout pc-board

3 mm

1 mm

1 mm

Non-porous, double-sided

adhesive strips

GEM foils

Gas inlet/ outlet (example)

Cathode layer

Absorber strong back

Fishing-line spacer schematic

Anode(pad) layer

(NOT TO SCALE)

Development of GEM sensitive layer

9-layer readout pc-board

3 mm

1 mm

1 mm

Non-porous, double-sided

adhesive strips

GEM foils

Gas inlet/ outlet (example)

Cathode layer

Absorber strong back

Fishing-line spacer schematic

Anode(pad) layer

(NOT TO SCALE)

80:20 Ar:CO2

Cathode-Anode

ΔV=2100 V

ΔV=415 V

GEM Development Timeline

Readout Electronics

Function

Institution

KPix chip Analog SLAC

DCAL chip Digital Argonne

Anode Board w/ Preamp

Analog UTA-Fermilab

Implement 100 ch readout using new DAQ electronics, PC board, uses LabView (Carlos-UTA)

Designing and Testing Signal Shaper to incorporate Fermi Pre-Amps with DAQ electronics

New GEM chamber designs for SLICE test

PASTPRESENT

FUTURESLICE

Test

Gas Mixture, HV, & Gain Efficiency

Single chamber with one readout

Single chamber with multiple simultaneous readouts

Test Beam at Fermi National Laboratory 1st Quarter 2007

SLICE test DCAL and KPix on GEM Argonne RPC w/DCAL

Meter Cube Stack using Double GEM – Beam Test

Tests of detector

Electronics pretests ADC needs a

readable signal from detector

Analysis depends on reliability of electronics

Efficiency Correlation between scintillator and detector

Multiplicity Cross talk between readout pads (tiles)

Tools for Analysis - Root Root

Read in asciII file format

Use root tools Create correlation

histograms from nTuples

Software controlled thresholds

{ // example of macro to read data from an ascii file and// create a root file with an histogram and an ntuple. gROOT->Reset(); #include "Riostream.h" ifstream in; // we assume a file basic.dat in the current directory // this file has 3 columns of float data in.open("basic.dat"); Float_t x,y,z; Int_t nlines = 0; TFile *f = new TFile("basic.root","RECREATE"); TH1F *h1 = new TH1F("h1","x distribution",100,-4,4); TNtuple *ntuple = new TNtuple("ntuple","data from ascii file","x:y:z"); while (1) { in >> x >> y >> z;

if (!in.good()) break; if (nlines < 5) printf("x=%8f, y=%8f, z=%8fn",x,y,z); h1->Fill(x); ntuple->Fill(x,y,z); nlines++;

} printf(" found %d pointsn",nlines); in.close(); f->Write(); }

Event23388

ch0 1.718750

Event23389

ch0 7.802734

Event23390

ch0 -0.737305

Event23391

ch0 -0.219727

Event23392

ch0 5.351562

Event23393

ch0 0.278320

Event23394

ch0 -0.742187

Event23395

ch0 0.253906

Event23396

ch0 0.776367

Event23397

ch0 -0.283203

Event23398

ch0 0.566406

Event23399

ch0 0.737305

Event23400

ch0 0.244141

Event23401

ch0 -0.209961

Event23402

ch0 -0.659180

Event23403

ch0 0.097656

Event23404

ch0 0.019531

Event23405

ch0 3.393555

Event23406

ch0 0.087891

Event23407

ch0 -0.185547

Event23408

ch0 -0.371094

Event23409

ch0 1.323242

Event23410

ch0 -0.463867

Event23411

ch0 -0.571289

Event23412

ch0 -0.488281

Event23413

ch0 -0.175781

Event23414

ch0 -0.239258

Event23415

ch0 2.480469

Event23416

ch0 -0.556641

Event23417

ch0 -0.039062

Event23418

ch0 3.867187

Event23419

ch0 1.484375

Read Data (ASCI) Files1Event0ch0 0.024414

Event1ch0 0.297852Channel Gain Queue

Event2ch0 2.045898

Event3ch0 -0.043945

Event4ch0 -0.595703

Event5ch0 1.064453

Event6ch0 0.068359

Event7ch0 -0.395508

Event8ch0 -0.727539

Event9ch0 0.341797

Event10ch0 2.060547

Event11ch0 -0.576172

Event12ch0 0.078125

Event13ch0 -0.249023

Event14ch0 -0.356445

Event15ch0 -0.039062

Event16ch0 0.454102

Event17ch0 -0.063477

Event18ch0 -0.166016

Event19ch0 -0.751953

Event20ch0 0.156250

Event21ch0 0.175781

Event22ch0 -0.317383

Event23ch0 0.273437

Event24ch0 -0.620117

Event25ch0 3.808594

Event26ch0 0.312500

Event27ch0 0.371094

Event28ch0 -0.068359

Event29ch0 0.590820

Plans before Fermilab Test

1. Work with peers on re-familiarization of necessary programming tools

2. Use Arnab’s example Root files and nTuples to create single histograms, correlation histograms and normalization histograms

3. Commission GEM readout electronics taking advantage of Root functionality using data files from GEMview program

4. Create development tools for efficiency and multiplicity test using Root