1 / 21

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.

Download Presentation

THE FORWARD PROTON DETECTOR AT DZERO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related