0 The LHCb Hadron Calorimeter Rustem Dzhelyadin, (IHEP, Protvino) INSTR02 Conference, BNPI, Novosibirsk, Russia Contents: Design overview Trigger with

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The LHCb Hadron CalorimeterRustem Dzhelyadin, (IHEP, Protvino)

INSTR02 Conference, BNPI, Novosibirsk, Russia

Contents: Design overview Trigger with HCAL Internal structure Iron plates production Scintillating tiles Fiber routing Module-0 assembly Calibration with 137Cs Beam-test Summary

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The LHCb Hadron Calorimeter

design overview

05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia

two separate movable halves:• stack of 26 modules in each half• 5.6 instrumented depth• 4.2(w) x 0.26(h) x 1.66(l) m • module weight 9.5 ton• read-out electronics on detector

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trigger on high Pt hadron


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internal structure


Sampling iron/scintillator: 5.58:1

• master plate 6 mm thick

• spacer plate 4 mm thick

• scintillator tile 3 mm thick

Natural iron path:

• 1cm lateral ~ 1 X0

• 20 cm longitudinal ~ 1 I

Mechanical advantages:

• self supporting, rigid

• same iron design both for

- full size cell and

- half size cell

Easy in construction:

• punching technology (iron plates)

• casting in mold (scintillator tiles)

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iron plates production


Three technologies tested:• milling - easy to start, but production rate and cost/quality problem• laser cut - low cost, productive, but tolerance problem • punching - good for mass production, but die construction needed

Module-0 parts (milled iron) Masters under test (laser cut)

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The LHCb Hadron Calorimeteriron plates production (cont.)


guide pinsguide pins

Die for masters punching

guide pinsguide pins

Die data: - weight 5.3 ton - contour circumference ~3 m - positioning accuracy 0.05 mm - dimension tolerance 0.10 mm - production rate 50 pc/h

Key dimension measured as 80.02

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The LHCb Hadron Calorimeteriron plates production (cont.)


Spacer punching in progress

Die data (for spacer #5): - weight 1.5 ton - contour ~93 cm - accuracy 0.05 mm - tolerance 0.10 mm - prod. rate 40 pc/h

Spacers #5 just after punch

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scintillator tiles


Scintillating tiles produced by casting in mold

Tile dimension: 197 x 256 x 3 mm3 - full size tile 197 x 127 x 3 mm3 - half size tile

All wrapped in TYVEK envelope

Fiber fed at edges inside TYVEK

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scintillator tiles


Tile response scan with -source:

• two-side fiber readout• wrapped in TYVEK

• whole tile• half tile

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The LHCb Hadron Calorimeterfiber routing


WLS fibers KURARAY type Y-11MS(250)

Mirror at far end - - aluminized

Two LED per module for calibration:

• timing (±0.5 ns)• short term stability• PMT linearity

Diamond head

Fiber cut tool

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The LHCb Hadron Calorimetermodule-0 assembly


Module-0 constructed in 2001:• iron - milled in Tula, Russia• assembled in IHEP workshop• delivered to CERN

Optics parts:• fiber aluminized at IHEP• tiles cast in Podolsk, Russia• assembled at CERN

PMT’s:• 24 FEU-115m10 from MELZ• 16 HM7899-01, HAMAMATSU

Two fast LED with drivers installed

Electronics for DC current measurement (induced by 137Cs radioactive source)

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calibration with 137Cs radioactive source


3 miniature 137Cs -source manufactured at JINR, Dubna: • 5 mCu, 8 mCu, 10 mCu

Allow measure any tile and fiber response:• continuous pipe-line through all modules• hydraulic pump-valve driver• garage for source housing

Readout electronics:• DC integrator ( = 2 ms)• 12 bit ADC (5 ms/module)• CAN-PCI (1 Mb/s)

Software:• CAN Open protocol drivers• Visualization - monitoring• SCADA control

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beam-tests


Module-0 on X7 beam-line at CERN SPS

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Summary


•Design goal - simple detector easy to construct

•Allow essentially improve sensitivity to hadronic final states of B-decay

•Productive and low cost technology available: casting and punching

• Module-0 has been constructed show feasibility of design

• Mass production started in 2002

Documents

0 The LHCb Hadron Calorimeter Rustem Dzhelyadin, (IHEP, Protvino) INSTR02 Conference, BNPI, Novosibirsk, Russia Contents: Design overview Trigger with