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Pileup Background Rejection

Fast Timing Detectors for FP420. MAN-06. WHO?. UTA ( Brandt ), Alberta (Pinfold), Louvain (K.P.), FNAL (Albrow) + SACLAY (Royon), Stoneybrook (M. Rij). WHY?. Pileup Background Rejection. Ex, Two protons from one interaction and two b-jets from another. How?. Compare z-vertex

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Pileup Background Rejection

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  1. Fast Timing Detectors for FP420 MAN-06 WHO? UTA (Brandt), Alberta (Pinfold), Louvain (K.P.), FNAL (Albrow) + SACLAY (Royon), Stoneybrook (M. Rij) WHY? Pileup Background Rejection Ex, Two protons from one interaction and two b-jets from another How? Compare z-vertex for SVX with TOF z=c(TR-TL)/2 How Fast? z (mm) =0.21 t (psec) (2.1 mm for t=10 psec) 10 psec -> x40 to x30 rejection

  2. The Detectors : 1) GASTOF (Louvain) http://www.fynu.ucl.ac.be/themes/he/ggamma/Cherenkov/

  3. 5 psec GASTOF • Advantages: • Presents little material to beam • Extremely fast • Disadvantages: • No segmentation • Long

  4. The Detectors : 2) QUARTIC proton • 8 fused silica rods in z (my fused silica!) Mike’s idea Jaak’s drawing

  5. Spread in timing as f() since n() 60 psec Fused Silica Bars • 9 cm bars • Some converted to mini-bars

  6. Sketch of Mini-bar Solution 6 20 p 6 dimensions in mm, not to scale (mini-bar at 50 deg to p) ~ 60 Fused Silica ~ 10 Air light guide (Jim’s) (Aluminium box, or mylar lined plastic) 4 4 Taper 6  4 (4 is a guess) (Crude “Winston Cone”) Match to photocathode “sweet spot” UTA simulations showed this solution superior to long bars

  7. beam 3.7 cm QUARTIC Preprototype side view 9.0 cm 4.7 cm 1.97 cm 2.57 cm 50º 2.54 cm 2.54 cm 2.54 cm top view MCP-PMT 6.4 cm 1.53 cm top view (photo)

  8. 20 psec QUARTIC (V2) • Advantages: • Segmentation (8 x 4) • Compact • Disadvantages: • More material • Not as fast

  9. Baseline Plan 1 QUARTIC Lots of silicon 1 GASTOF

  10. T958 • Fermilab Test beam experiment to study fast timing counters for FP420 (Brandt spokesman) • Used prototype/preprototype detector with expensive or Louvain-made amplifiers and NIM/CAMAC discriminator/TDC to test concept • Sporadic mostly parasitic running Aug 12- Sep 14 (primary user Sep 7-10, 14) Time resolution for the full detector system: 1. Intrinsec detector time resolution 2. Jitter in PMT's 3. Electronics (AMP/CFD/TDC)

  11. Initial Results For QUARTIC bar at 2300V Get 110 psec after correcting for variable height in bar (compared to 90 psec for G at same voltage); Efficiency typically .5 to .6/bar, low of .2, high of .9, at least part of dependence due to CFD performance G1-G2 For events with a few bars on see anticipated √N dependence <70 psec/Gastof (2500V) >90% efficiency

  12. Upgrade for T958 Phase II Planned for March 7-20 • New detector prototypes • New electronics • Improved DAQ • Improved alignment • Automated analysis and database routines, to allow instant and easier analysis • Improved tracking

  13. T958 Electronics Phase I: Amplifier : Hamamatsu Ortec Phillips Burle 8x8 MCP-PMT 25 um pore Constant Fraction Discriminator Ortec 934 (9307) TDC (Phillips 7186) SMA SMA Lemo 10 um Burle or 6 um Hamamatsu HPTDC Phase II: New boards (Louvain/Alberta) Phase III:

  14. Extrapolating Suppose we did no better in next run (!): 67 psec/GASTOF +8bars *.6 eff at 110, this would give 40 psec track measurement or about ~x10 background rejection. Lars estimates 40 psec for revised electronics, conservatively 40 psec for 10 um tube and 30 for detector (64 psec/bar), and .75 efficiency gives 26 psec for QUARTIC alone, combined with a GASTOF (elec=40,tube=20,det=10) of 44 psec, gives 22 psec track (x18). Ultimately QUARTIC might be (20, 15, 20) but lets assume limit of (25,25,25) gives 15 psec + GASTOF (15,10,5) gives 18 psec -> total ~11 psec (x37). A second QUARTIC could get us <10.

  15. New Baseline Plan 2 QUARTICs Lots of silicon 1 GASTOF

  16. Critical Issues for T958 Phase II • New detectors • a) QUARTIC • light tight interface to tube, mounting+cabling, alignment • full layout diagram with all cable lengths, crate location etc. • purchase of cables+ connectors • delivery of 2nd Burle tubes • b) GASTOF • mounting+alignment • tube change possible? • dimensions • 2) Electronics *(Schedule risk) • a) Alberta: layout, fabrication, financing of boards, low voltage • b) Louvain: layout, fabrication • 3) MOU +ORC updates • 4) Mar 7-20, manpower • 5) DAQ/tracking upgrades*(result risk) • 6) New trigger counters/fast clear of TDC

  17. Manchester Major Milestones • CURRENT FOCUS: March 2007: test beam, to evaluate electronics performance, validate detector design. Achievement of 40/60 picoseconds resolution per channel, 25/track. • Early summer 2007: funding request • August 2007: CERN test beam, integrated test (RISK: readout integration, although developing plan with Scott) • January 2008: production • Spring 2008: final tests • Summer 2008: delivery for assembly • Winter 2008: installation

  18. TDR Motivation Detector concept G+Q Electronics *Simulations detector performance/rejection; backgrounds Test beam results performance/rejection *Readout, integration, triggering, reco software Reference timing *Alternate technology (silicon PMT?, 3D silicon?) **Technical risk: Associated with PMT operation • backgrounds in detector/PMT, especially from soft/slow local particles • coherent noise • radiation/rate issues *NOT under control (manpower)

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