M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 1

The CDF MiniPlug Calorimeter

Forward Physics Conceptual

Design Prototype

Results Final Design Cosmic Ray Test Run II Data

M. Gallinaro (The Rockefeller University)

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 2

Forward Physics

• Hard Single Diffraction• Double Diffraction• Double Pomeron Exchange• Forward Jets (jet-gap-jet)• Exotics (DCC’s, Mini-centauros,

…)• Small-X gluon structure function

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 3

Conceptual Design

• PB plates in liquid scintillator

• WLS fibers to MAPMT

• Towerless geometry (no mechanical boundaries)

• “Tower” size determined by fibers’ grouping

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 4

Conceptual Design

• Measure charged and neutrals

• Hadrons release on average 1/3 of 0 energy

• Measure energy and position of both EM and hadron showers

• GEANT simulation: /E(e+) = 18%/E /E(+) = 30% independent

of E

• Hadron tagging fibers after 24 r.l.

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 5

MP Prototype

• Detector: 28-r.l. (1 i.l.) long 15x15 cm2 plates Bicron 517 L liquid

scintillator Kuraray Y-11 WLS fibers

• Test-beam: low energy pions and

electrons at BNL high energy beams at

Fermilab in 1997

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 6

Prototype ResultsLinearity EM Energy

Resolution

e+ Position Resolution

+ Position Resolution

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 7

Test Beam Data

50 GeV +

50 GeV e+

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 8

MiniPlugs in CDF-II• Due to space constraints

when Plug in “open” position, final MPs are 61-cm long(32 r.l. and 1.3 i.l.)

• Same plate/gap thickness, scintillator of prototype

• Larger hexagonal cell structure, balanced by increasing: Number of fibers (6 vs.

4) Fiber dia. (1 mm vs. 0.8

mm)

(installed in November 2001)

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 9

Final Design

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 10

Final Design

• 6 WLS fibers = hexagon 1 MAPMT pixel

• 1 clear fiber to LED

• 252 hexagons viewed by 1816-channel MAPMT

• 3 MAPMT outputs added 84 calorimeter “towers” (to reduce electronics’ cost)

• 4 rings: 3.6<||<5.1

• 18 + 18 “trigger-towers”East MP (viewed from IP)

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 11

MiniPlug Assembly

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 12

MiniPlug Assembly

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 13

MAPMT Test

• Channel-to-channel response Hamamatsu R-5900 (16 channels)

MAPMT test setup

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 14

Cosmic Ray Test

• Measure response to single photoelectrons (Co60 source)

• Trigger on cosmic rays for 60o-section of one MP

Average response is 100 p.e./MIP

x 10 amplification

(prototype was ~55 p.e./MIP)

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 15

MP Calibration

• Run II : s = 1.96 TeV

• Use slope from ADC distribution

• Tower-to-tower relative calibration with data/MC

• Energy scale from MC

Pile-up at high luminosity

(Slope-Fit)/Fit ~7%for each ring

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 16

MP Collider Data

•Fully instrumented

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 17

MP Collider Data

Particle multiplicity ~7

Tower ET distribution

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 18

Conclusions

• Two MP calorimeters (Pb/liquid scintillator) installed at CDF

• MPs measure energy and position of particles (3.6<||<5.1)

• Cosmic ray test resulted in light yield of ~100 pe/MIP per tower, exceeding design requirements

• MPs fully instrumented; first data taken from Collider run

• Forward physics goals (forward jets/gaps)

• MPs (together with Plug calorimeter) measure width of rapidity gap(s) from diffractive processes

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 19

“The universe (…) is composed of an indefinite and perhaps infinite number of hexagonal galleries.(…)There was no personal or world problem whose eloquent solution did not exist in some hexagon.”

Jorge L. Borges in The Library of Babel

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 20

Roman Pot Fiber Tracker

Fiber Tracker

3 trigger counters240 channels

3 stations57 meters from IP

MIPs ( > 1000 counts)

M.Gallinaro, ``Innovative Particle and Radiation Detectors’’, Siena, October 21-24 2002 slide 21

Beam Shower Counters

Beam LossesL1 Trigger

(veto E/W, minimum bias)