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THE FORWARD PROTON DETECTOR AT DZERO

THE FORWARD PROTON DETECTOR AT DZERO. Gilvan Alves Lafex/CBPF. 1) MOTIVATION 2) DETECTOR OPTIONS 3) FPD R&D 4) OUTLOOK. Lishep 98 Lafex/CBPF Feb 17, 1998. p Beam. p F. P. p. p. Diffractive Kinematics. Rapidity Gap Approach Need to Tag and Measure p( p ). Detector.

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THE FORWARD PROTON DETECTOR AT DZERO

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  1. THE FORWARD PROTON DETECTOR AT DZERO Gilvan Alves Lafex/CBPF 1) MOTIVATION 2) DETECTOR OPTIONS 3) FPD R&D 4) OUTLOOK Lishep 98 Lafex/CBPF Feb 17, 1998

  2. pBeam pF P p p Diffractive Kinematics • Rapidity Gap Approach • Need to Tag and Measure p( p ) Detector

  3. Y - Pot 14.4mm 20mm X - Pot 6.8mm Beam Axis 8s Beam Envelope The Detector UVX Planes 0.8mm

  4. DETECTOR GOALS • Position resolution of 100µm • Efficiency close to 100% • Radiation Hardness • High Rate capability • Low background rate • Small dead area close to the beam

  5. Quadrupole Dipole ACCEPTANCE x Quadrupole ( p or ) 450 400 350 280 200 MX(GeV) Geometric (f) Acceptance x Dipole ( only) GeV2 450 400 350 280 200 MX(GeV) GeV2 Dipole acceptance better at low |t|, large x Cross section dominated by low |t| x 0 0.02 0.04 1.4 1.4 1.3 2 35 95

  6. DETECTOR OPTIONS

  7. Photon Detection Device • Quantum Efficiency • Light  Charge • VLPC ( 80%) • APD ( 70%) • Image Intensifier • CCD ( 20%) • Low rate • MAPMT ( 20%) • VLPC the best option • But... cryogenics$$$

  8. DETECTOR OPTIONS • Fiber Options Investigated • Scint. Tile to Clear Fiber • Scint. Tile to WLS Fiber • Scint. Fiber Straight • Scint. Fiber to Clear Fiber • Round vs. Square Fibers

  9. Scint Tile 800m thick WLS fiber DETECTOR OPTIONS 4fibers  PMT Scint Tile 800m thick Clear Fiber 2 WLS fibers  PMT

  10. Scint Fibers 800m Clear fiber DETECTOR OPTIONS Mirrored side 4fibers  PMT Scint Fibers 800m Mirrored side 4fibers  PMT

  11. DETECTOR OPTIONS XY Plane Detector Active Area Pot UV Plane Pot

  12. DETECTOR OPTIONS • Square Fibers Increase • light Yields by  20% • Scint. Tile to Clear Fiber or WLS discarded for low yield • Reduce Pot Size Using tilted planes (U,V) • Fiber bend does not affect performance(limited to  = 5cm)

  13. Single PE Measurement H6568 LED Calibration. Scint. Tile + Clear Fiber <NPE>=3.0

  14. Scint. Fiber Output H6568 <NPE>=7.3 Effect of cutting Fiber at 45 <NPE>=6.8

  15. <NPE>=7.4 Scint. Fiber + Clear Fiber Output H6568 • Similar to Uncut Straight Fibers • Gain Attenuation length • Losses due to • Cutting Fiber at 45 (5%) • Fiber Splicing (5-10%) • Preferred Option • Accelerator Background • Cross Talk

  16. Cross Talk Results H6568 1.3mm window thickness Improved by new 0.8mm window Using Scintillating Fibers w/o EMA => 25% increase

  17. Efficiency Measurement Use 10644Ru 3.5 MeV e- Source D Source Collimator T2 T1 D - Detector Cell T1&T2 - Trigger Scintillators  = 90-95% (not corrected for  background)

  18. THE DETECTOR Six planes (u,u’,v,v’,x,x’) of 800 m scintillator fibers (’) planes offset by 1/3 fiber 20 channels/plane(U,V)’ 16 channels/plane(X,X’) 112 channels/detector 2016 total channels 80 m teor. resolution

  19. THE DETECTOR 4 Fiber bundle fits well the pixel size of H6568 16 Ch. MAPMT 7 PMT’s/detector (most of the cost) U’ U

  20. SUMMARY • Fiber Detector represents the best option • Prototype being built for beam/cosmic tests • FPD will be a completely integrated sub-detector • of the detector which will help maximize • Run II physics potential • Hard diffraction needs large data samples and precise measurements

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