Block Diagram of Level 1 Pattern Pixel Track Vertex Recognition - - PowerPoint PPT Presentation

▶
block diagram of level 1
SMART_READER_LITE
LIVE PREVIEW

Block Diagram of Level 1 Pattern Pixel Track Vertex Recognition - - PowerPoint PPT Presentation

Apr 27, 2023 248 likes •487 views

Block Diagram of Level 1 Pattern Pixel Track Vertex Recognition System Reconstruction Reconstruction FPGA DSP Associative Vertex Farm Memory (1 DSP per crossing) DSP Track Farm Average Average (4 DSPs per crossing) Latency:

slide-1
SLIDE 1
slide-2
SLIDE 2
slide-3
SLIDE 3
slide-4
SLIDE 4
slide-5
SLIDE 5
slide-6
SLIDE 6
slide-7
SLIDE 7
slide-8
SLIDE 8
slide-9
SLIDE 9
slide-10
SLIDE 10
slide-11
SLIDE 11
slide-12
SLIDE 12
slide-13
SLIDE 13
slide-14
SLIDE 14
slide-15
SLIDE 15
slide-16
SLIDE 16

1 1

Pixel System

FPGA Associative Memory

Pattern Recognition Track Reconstruction Vertex Reconstruction

DSP Track Farm (4 DSPs per crossing)

Average Latency: 0.4 µs Average Latency: 200 µs

DSP Vertex Farm (1 DSP per crossing)

Average Latency: 250 µs Average latency for the Level 1 trigger: 0.5 ms Number of DSPs (e.g. TMS320C6701): 2000 + 500 = 2500

Block Diagram of Level 1

slide-17
SLIDE 17

BTeV Pixel Trigger (FPGA)

  • Form Hit Clusters, sort by quadrant (More Parallel)
  • Search “In out” and “Out in” in precision bend view
  • Start near pipe and near edge – Use Beam/Material constraints
  • Find Confirming hit, then match non-bend pixels
  • Pass on info to DSP’s

Approach reduces combinatorics too Inside Hole Of Next plane Outside, but close, and from beam Fake Hit Fake Plane

slide-18
SLIDE 18

DSP’s Form tracks form segments found by FPGA’s

BTeV Pixel Trigger (DSP Part A)

Tracking 85% efficient > 5GeV

  • BTeVGEANT contains hadronic

interactions, γ conversions, δ-rays

  • Pixel hits have non-Gaussian tails

(derived from test beam data) After clean up cuts Momentum of tracks in fiducial

  • Average of 2 interactions per

crossing Tracks get passed to Vertex DSP

slide-19
SLIDE 19

74%

1%

BTeV Pixel Trigger (DSP Part B)

  • Form Verticies
  • Require 2 tracks:

a) Within 2mm of primary b) > 6 “errors” of impact Keep ~50% of B’s Reject 99% of min bias

slide-20
SLIDE 20

L1 Trigger Performance

State efficiency(%) state efficiency(%) B → π+π- 63 Bo → K+π- 63 Bs → DsK 71 Bo → J/ψ Ks 50 B-→ DoK- 70 Bs → J/ψK* 68 B-→ Ksπ- 27 Bo → ρoπo 56

Full GEANT simulations including pattern

recognition done for trigger

Refinements and Recoveries in Level 2 and Level 3

slide-21
SLIDE 21

Pixel hits after 1st segment finding

slide-22
SLIDE 22

This is the most Dramatic change..