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UPDATE ON THE FORWARD PROTON DETECTOR

UPDATE ON THE FORWARD PROTON DETECTOR. Gilvan Alves Lafex/CBPF. Introduction Accelerator Roman Pots Detector Future Plans. April 1, 1998 (no kidding). FORWARD PROTON DETECTOR. Roman Pot. Bellows. p. p. Detector. A 1Q. P 1Q. A 1S. P 1S. S. D. Q 1. Q 2. Q 3. Q 4.

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UPDATE ON THE FORWARD PROTON DETECTOR

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  1. UPDATE ON THE FORWARD PROTON DETECTOR Gilvan Alves Lafex/CBPF • Introduction • Accelerator • Roman Pots • Detector • Future Plans April 1, 1998 (no kidding)

  2. FORWARD PROTON DETECTOR Roman Pot Bellows p p Detector A1Q P1Q A1S P1S S D Q1 Q2 Q3 Q4 Q4 Q3 Q2 S A2Q A2S P2S P2Q AD2 AD1 59 57 36 31 23 19 13 7 0 7 13 19 23 31 Z(m) Series of 18 Roman Pots forms 9 independent spectrometers 1 Dipole Spectrometer ( p ) x > xmin 8 Quadrupole Spectrometers (p or p, up or down, left or right) t > tmin

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

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

  5. PROPOSAL FOR A FORWARD PROTON DETECTOR AT DZERO (P-900) Andrew Brandt FNAL/ 1) PHYSICS MOTIVATION 2) FPD DETAILS Fermilab PAC meeting Fermilab October 17, 1997

  6. ACCELERATOR MODIFICATIONS 1) Move low beta quadrupoles ~ 2/3 meter closer to the interaction point. Requires modified quadrupole supports. 2) Insert pots in electrostatic separator region. Requires bypass extension. Bypass extended

  7. ACCELERATOR MODIFICATIONS • 3) Dipole Spectrometer does not require • modifications  Warm section exists. • Feasibility and Cost Studies done in conjunction with Beams Division (see Memo). • No interference with Tevatron operation • Total Cost  $500k (Mostly Engineering Labor). • An Engineer from Brazil will work with the AD on the modifications. • Mike Martens has joined the FPD group and will act as the Beams Division Liaison Person for this project.

  8. FRONT VIEW OF PROPOSED ROMAN POTS

  9. SIDE VIEW: CROSS SECTION

  10. Full Scale Model Presented at Lishep98 - Rio

  11. Full Scale Model Presented at Lishep98 - Rio

  12. Full Scale Model Presented at Lishep98 - Rio

  13. Further Development in Progress • Reducing Pot “Long Neck” Size • Interface with Pumping Devices • Chainless Design • Agreement Signed with LNLS for • Prototype building this spring • LNLS - National Synchrotron Lab • Helps on Funding • Prague group is Helping with • design & Vacuum expertise

  14. THE DETECTOR Six planes (u,u’,v,v’,x,x’) of 800 m scintillator fibers (’) planes offset by 2/3 fiber 20 channels/plane(U,V)’ 16 channels/plane(X,X’) 112 channels/detector 2016 total channels 80 m theoretical resolution

  15. 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

  16. 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$$$

  17. 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

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

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

  20. Detector Test Setup Use 10644Ru 3.5 MeV e- Source D Source Collimator T2 T1 D - Detector Cell T1&T2 - Trigger Scintillators

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

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

  23. <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

  24. Current Developments • 0th order Fiber detector Prototype being tested • DAQ for prototype testing has been assembled • Modifications to Splicing Machine being made • Work on adapting CFT Trigger System • Work on FPD Trigger strategy in progress

  25. 1998 Plans • Finalizing Detector and Pot Designs • BothPrototypes Ready by Fall • Request for National Grant within Brazil • Project Integration within accelerator and D

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