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The LHCb Hadron Calorimeter Rustem Dzhelyadin, (IHEP, Protvino). Contents: Design overview Trigger with HCAL Internal structure Iron plates production Scintillating tiles Fiber routing Module-0 assembly Calibration with 137 Cs - PowerPoint PPT Presentation
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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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The LHCb Hadron Calorimeter
trigger on high Pt hadron
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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The LHCb Hadron Calorimeter
internal structure
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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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The LHCb Hadron Calorimeter
iron plates production
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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.)
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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.)
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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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The LHCb Hadron Calorimeter
scintillator tiles
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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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The LHCb Hadron Calorimeter
scintillator tiles
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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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The LHCb Hadron Calorimeter
calibration with 137Cs radioactive source
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
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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The LHCb Hadron Calorimeter
beam-tests
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
Module-0 on X7 beam-line at CERN SPS
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The LHCb Hadron Calorimeter
Summary
05.03.2002 Rustem Dzhelyadin(IHEP, Protvino)INSTR02 Conference, BNPI, Novosibirsk, Russia
•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
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