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First Results from the MINOS Calibration Detector. Patricia Vahle University of Texas at Austin for the MINOS Collaboration. Outline: MINOS in a Minute Why a 3 rd detector Detector & Beam Electrons & Hadrons Summary. Work made possible by: DOE, Welch—US PPARC—UK.

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First results from the minos calibration detector

First Results from the

MINOS Calibration Detector

Patricia Vahle

University of Texas at Austin

for the

MINOS Collaboration

  • Outline:

  • MINOS in a Minute

  • Why a 3rd detector

  • Detector & Beam

  • Electrons & Hadrons

  • Summary

Work made possible by:

DOE, Welch—US

PPARC—UK


First results from the minos calibration detector

MINOS in a Minute

FarDetector

(Soudan Mine)

  • 735 km long-baseline

  • neutrino experiment

  • Two tracking

  • calorimeters

Near Detector (prototype)

(Fermilab)


First results from the minos calibration detector

Why a 3rd Detector?

  • Underground detectors--

  • no calibration beam

  • 5%absolute calibration required

  • Calibration Detector (CalDet) to determine

  • response vs.

    • particle type (m, e, h)

    • energy

    • topology

  • TuneMonte Carlo

  • Tune pattern recognition algorithm--

  • NC/CC separation

  • Characterize response in terms ofmuons

  • Study hadronic response of detector at

  • low energies


First results from the minos calibration detector

The Detector

Last Dipole

T11

  • 1 m x 1 m x 3.7 m

  • 60 planes of 1 cm co-extruded plastic

  • scintillator, backed by planes of 2.5 cm Fe

  • 5.9 cm pitch

  • 5 modules (for moving)

  • Each scintillator plane composed of 24

  • strips, 4.1 cm wide, a total of 1440 strips

  • Consecutive scintillator planes rotated 90o

  • Wavelength shifting fiber glued into

  • scintillator routes light out of detector

  • Clear and green (to simulate size of far

  • detector) ribbon cable transports light

  • to PMTs

Beam Line

Electronics and PMTs

1m

24 strips

x 60

(3.7 m)

Scintillator

1m

Steel

5.9 cm


First results from the minos calibration detector

Active Detector Components

  • Near/Far Detectors differ

  • in readout to achieve

  • similar response.

  • CalDet directly compares

  • differences

  • Currently configured to

  • mimic Far Detector

    • Hamamatsu M16

    • VA front-end

    • Double-ended readout

  • Future->mimic Near

  • Detector

    • Hamamatsu M64

    • QIE front-end

    • reflectors


First results from the minos calibration detector

Beam Line

East Hall Schematic

  • T11 (East Hall) PS complex at CERN

  • Max p= 3.6 GeV/c

  • Dp/p=3% (collimators open)

  • Control of intensity

    • collimators

    • quad defocus

  • Beam composition: p, p, e , m 

  • PID: Cerenkov and TOF

  • Ran at energies ranging from 0.5-3.5 GeV, roughly 0.5 GeV steps

Particle Fractions in T11

%

Beam Momentum


First results from the minos calibration detector

MINOS in a Beam

  • MINOS Far Detector electronics designed

  • for low rates

  • Rate Related effects in spill

    • Chips dead for 4.5 ms after readout

    • Hit channels take 50 ms to recover

  • Hence, at the CalDet, we write outevery hit!

    • Perform a plane trigger offline

    • Record “chip histories”

e Energy

MEU

Channel Recovery after hit

Dead Channels

Strip

Pedestal ADC

Plane

Time(ms)


First results from the minos calibration detector

Particle Identification

CER

TOF

  • Threshold Cerenkov Detector for e identification

    • CO2

    • pthresh,m=3.5 GeV, pthresh,p =4.5 GeV

    • Events from peak of pulse height distribution

  • Time of FlightSystem for p, p+ separation

    • 12.8 m lever arm

    • 35 psec. LSB

  • Other event selection criteria:

    • 4/5 plane trigger

    • electronics cuts

    • veto non-beam events

    • cuts on response in first scintillator plane


First results from the minos calibration detector

Electrons and Positrons

  • MEU: Muon Energy Unit, mean pulse height due to a through-going muon measured in a strip end

Hits

“Wings”

due to PMT xtalk

Strip

Plane

Sample Event (2GeV e+)

Strip vs. Plane profile, weighted by number of hits

Even Plane view

Odd Plane view

MEU

Relative Pulse Height

Strip

Strip

Plane

Plane

Strip vs. Plane profile, weighted by MEU deposited


First results from the minos calibration detector

Electron Event Characteristics

MEU(plane)/Tot. MEU

vs. Plane number

X0=4.1 cm (.69 planes)

<Planes Hit>=10.3

MEU(strip)/Tot MEU vs. Radius

rm=3.1 cm (.75 strips)

MEU

MEU Distribution

Sigma/Mean = 16.5%


First results from the minos calibration detector

Detector Response

Total MEU vs. Beam Momentum

MEU=p1*Momentum+p0

Total MEU

Preliminary

Resolution2 vs. 1/Beam Momentum

Momentum

Res2=k2+m2/p

Resolution2

Expected resolution, 23%/E

constant term <5%

1/Momentum


First results from the minos calibration detector

Hadrons

Sample Pion Events

Sample Proton Events

Odd Plane view

Even Plane view

Even Plane view

Odd Plane view

Strip

Strip

Relative Pulse Height

Relative Pulse Height

3.5 GeV

3.5 GeV

Plane

Plane

2 GeV

2 GeV

1 GeV

1 GeV


First results from the minos calibration detector

Hadron Event Characteristics

Pions (+1.6 GeV)

Protons (+1.6 GeV)

Peak at ~38 hits/event

Peak at ~50 hits/event

Peak at ~13 Planes Hit

Peak at ~13 Planes Hit


First results from the minos calibration detector

Energy Spectra of Hadrons

Pion MEU distributions

Proton MEU Distributions

1 GeV

1.6 GeV

1.6 GeV

1 GeV

2.5 GeV

2 GeV

2 GeV

2.5 GeV

3 GeV

3.5 GeV

3 GeV

3.5 GeV


First results from the minos calibration detector

Summary

  • CalDet Preliminary results:

    • EM resolution 23%, as expected

    • Analysis of hadrons progressing

  • Further analysis

    • Tune MC

    • Pattern Recognition

  • More data in 2002-2003

    • Higher energies

    • Different electronics