Muons & Particle ID

Muon/PID Studies

Global Simulation Software Dev. - A. Maciel - NIUTracking/ID w/µ, π, bb events – C. Milstene – NIU/FNAL

Scintillator Module R&D Overview – G. Fisk – FNALMAPMT Tests/Calib/FE Elect. – P. Karchin – Wayne St.

Digitization & Readout – M. Tripathi – UC DavisGeiger Mode APD R&D - R. Wilson – Colorado St.

European Muon Studies – M. Piccolo –INFN Frascati

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1/15/2004 Gene Fisk 1

Major Software Issues• Dev. of global cal/muon planar detector

representations and first usage. A. Maciel• Development of Muon Identification Algorithms• Testing the algorithms on:

MuonsPionsb Pair Events

• Pion punchthrough• Low energy muons

C. Milstene & M. Piccolo

Gene Fisk 2

NICADD Test Beam Simulator

Project Description

• Test Beam Prototype • Hadron & EM Calorimeters, Tail Catcher• HCal & ECal layering similar to SDJan03• Polystyrene and Silicon sensitive regions

A. Maciel 1/7/2004

All Trajectories and Lit Cells: Side Viewpi+E = 20 GeVall traj & lit cells

SimulationSimulation

implemented implemented

in standalonein standalone

G4 and “G4 and “MokkaMokka””

A. Maciel 1/07/2004

Strip Width Studies

Limits are determined by;

• minimum: -- σx(hits) w.r.to theprevious layer

-- cost (#of channels)• maximum: -- hit densities

-- geom. resolution(e.g. track matching)

We looked at multiple scattering σx and hitdensities using a GEANT4 implementation of the“Tail Catcher”. For calorimetric studies seeVishnu Zutshi’s talk, calorimetry session 6.

geometryonly

•• geometry and reconstruction onlygeometry and reconstruction only•• does not include light collectiondoes not include light collectionG. Lima

J. SimmonsV. ZutshiA. Maciel

A. Maciel 1/07/2004

σ(X) w.r.t. incident position

4 cm strips => σ = 1.2 cm

A. Maciel 1/07/2004

Muon ID Algorithm DevelopmentSiD detector: Rin = 349 cm;

Rout = 660 cm.5 cm thick Fe; 32/48 1.5 cm gaps instrumented.

1. Extrapolate fitted tracks to EC, HC and MuDet.

2. Collect hits in (∆θ, ∆ϕ) bins about extrapolated trks.

3. For muons with p > 3 GeV/c require 16/32 hits taking into account dE/dx.

Similar studies by M. Piccolo

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Single Muons

C. Milstene 1/07/2004

Muon ID Algorithm DevelopmentAnalyze single pions with the same algorithm to

get punch-through. At 50 GeV/c it is 1.4%.

C. Milstene July 2003

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Muon ID for bb Events_

10K bb events @ 500 GeV Pandora Pythiagenerated at NIU.

Single muon eff.

µ from bb

C. Milstene 1/07/2004

Hadrons near muons…. for bb_

• For 5000 bb events there were 136 tracks that satisfied the µ algorithm but were labeled as hadrons entering the µ detector, because there was a hadron in the allowed (∆θ, ∆ϕ) window of the extrapolated track. Many of these are low p tracks.

• About 70% of these tracks have two, or sometimes three, nearby tracks where one is a true µ.

• By using the µ ID algorithm in Hcal, (# of hits/layer, etc.) it looks like about 2/3 of these tracks can be identified as muons or hadrons.

• M. Piccolo has also looked at low momentum µ tracks, because of interest in LC physics, e.g. LSP could be massive, slightly less than the smuon mass . Use Hcal.

• Work in progress… Intra-detector studies!C. Milstene 1/07/2004

Hardware Development

P. Karchin – Scintillator Based Muon System Collaboration page 14 1/8/2004

Layout of Scintillator Strips in one Plane

Optical Fiber Work at Notre DameM. Wayne

● 64 long pieces of clear fiber polished and tested with LED-Photodiode system. σ of < 0.5% for all fibers.

● WLS-clear fiber splicing at Fermilab; transmission tests at ND

● Fabricate small mockup by mid-January to study:– 180o turn at end of scintillator – Protection of chamber edges– Channeling of clear fibers back to PMT– Interface between scintillator/routing plate/outer skin

P. Karchin - Scintillator Based Muon System Collaboration

PMT Test and Calibration at WSU

A Hamamatsu R5900-M16 MAPMT mounted in a MINOS (far detector) base. The assembly has been modified to accommodate an aluminum guide for optical fibers. The 16 holes in the aluminumblock are aligned with the MAPMT photocathode grid. Ambient light or pulses from an LED are injected into individual pixels. Cables are visible for HV bias and anode signal readout.

P. Karchin 1/08/2004

PMT Test and Calibration at WSUM16 PMT with MINOS base – response to LED pulse

LED

PMT

P. Karchin 1/08/2004

M. Tripathi 1/07/2004

UC Davis MAPMT test-stand Bias-board PMT/Pre-amp Board

LED Pulser

Mounts With 90o

CalibratedRotation

Dark-box

UC Davis Pre-amp Board housing 16 channel PMT and Amplifiers

•4.5” x 4.5”

•Dynode resistor chain built-in

•16 amplifier chips on-board

M. Tripathi 1/07/2004

GPD Scintillator/Fiber Test BedTrigger Scintillator Stack

Detector ScintillatorY11 Readout Fibers (4*)

Flat Mirror Optically Coupled to Readout Fiber End

Extra length of Y-11 Fiber Epoxied to Readout Fiber End

Aluminum Light Shield Tube Around FiberGPD Mounted to X-Y Translator Stage

* For these measurements only a single fiber was instrumented with GPD readout.

Estimate average 4 photons/event at the end of spliced 1 mm diameter Y11cores fiber and 0.15 mm GPDs.Use QE*A=0.069 estimated for single 150 micron GPD at 20oC using LED -predict DE~0.24 neglecting additional losses, such as Fresnel reflection at the Y11-GPD interface.

Preliminary measured detection efficiency in test bed: 21±5(stat.)±??(sys.)%

Geiger Mode Avalanche Photo-Diode R.Wilson

R. Wilson 1/07/2004

New RPC production(the CAPIRE collaboration)

14/10/2003

13/10/2003

Screen printed resistive coating1 m X 1 mM. Piccolo 1/08/2004

Spatial resolutionA good glass RPC

Resolution of single RPC of the same order as the bakelite one.

Here too the actual value of the spatial resolution is set by the strip pitch.

Fit with two Gaussian distributionslead again to a ratio narrow/wide 20:1.

M. Piccolo 1/08/2004

Test @ BTF4+1 RPCs

M. Piccolo 1/08/2004

Scintillator

Calorimeterbeam

3 cm strips8 strip=1 ADC ch

Typical plateau curve

• Plateau curves for our standard mix (48/48/4) (Ar/Fr/Is).

• Four different 1m2

chambers .• The beam was

hitting the lower left corner of the detectors

• A fast area scan did not show any anomalies

M. Piccolo 1/08/2004

Future ActivitiesSimulation

• Global development: Planar detectors/45o

strips studies.• Muon ID algorithms:

low p using Ecal/Hcal; isolation cuts; full detector tracking χ2 for µ/had discrimination; w/SiD.

• Event samples: µ, π, bb, µµ with (mµ – mlsp) small.

Hardware• QA existing scintillator,

WLS & clear fiber.• 1m strip R&D: fiber splice

tests, fiber routing, light tighting, MAPMT mech., HV, etc.

• MAPMT calibration,cross talk, noise, shielding, etc.

• FE electronics, prototype digitization and DAQ – for 128 channels (single plane).~~ ~

G. Fisk 1/9/2004