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Advancements in TOP Counter Technology and PID Development for Particle Physics

This document provides an overview of the latest research and development status of the TOP (Time Of Propagation) Counter and its integration with Particle Identification (PID) systems, presented at the Nagoya University PID Workshop. Key highlights include advancements in timing resolution, photon detection, and the analysis methods employed for better performance in particle detection. The TOP Counter shows promising results in separating particle types and improving PID efficiency, particularly for next-generation B-factory applications. Ongoing collaborations on fused silica bar production and testing results are discussed.

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Advancements in TOP Counter Technology and PID Development for Particle Physics

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  1. TOP Counter R & D Status Katsumi Senyo Nagoya University • PID and Physics • TOP Counter • R&D Status PID Workshop@Nagoya

  2. PID and Physics B->Kp/pp B->DK/Dp 85.2±10.1 12.3±3.9 Preliminary! 0.4±3.8 PID Workshop@Nagoya

  3. TOP Counter Performance(K/pi separation) TOP ideal performance: Better than sig. 4 PID Workshop@Nagoya

  4. PID and Physics TOP(expected perf.) Current PID devices PID Workshop@Nagoya

  5. Time Of Propagation(TOP) Counter Reflection mirror 200mm y z x 20mm A few meters PMTs Fused silica(n=1.47) PID Workshop@Nagoya

  6. TOP Counter Crystal Bar 1m MAPMT PID Workshop@Nagoya

  7. PID Devices (3) • Cerenkov Counter A charged particle velocity greater than the (local phase) velocity of light →Radiating Cerenkov light Cerenkov cone half angle: cosq = 1/nb PID Workshop@Nagoya

  8. DIRC(Detection of Internally Reflected Cherenkov light) and TOP Counter DIRC: Radiation angle -> X-Y position TOP: Radiation angle -> Prop. Time-X position Time or Both TOP and DIRC give a hyperbolic projection image of Cherenkov light. 1m PID Workshop@Nagoya

  9. TOP Counter y L z PMT qz Radiation angle Propagation time Short Propagation time: p - like Long Propagation time : K - like PID Workshop@Nagoya

  10. DIRC (cont.) • What’s problem in DIRC? Huge Stand-off Volume ~4m Is really such a dead volume needed? PID Workshop@Nagoya

  11. TOP Counter • The 3 dimension information of the Cerenkov cone is resolved with time and x position at the cross section of the fused silica. Propagation times of １,2,3 are different ３ ２ １ Readout PID Workshop@Nagoya

  12. TOP Counter （ns） （ns） Unfolding TOP TOP x x （mm） （mm） 30 photons observed in typical case. PID Workshop@Nagoya

  13. Key Issues on TOP Counter R & D • Good timing resolution(~100ps) on a single photon measurement w/ position-sensitive(~1mm) MAPMT. • Precise fused silica bar production on geometry and smoothness (~ Å). • Sophisticated analysis method. PID Workshop@Nagoya

  14. MAPMT R & D HPK R5900-U-L16 • Transit Time Spread~７５ ps • channel width １mm Insensitive region Collaboration w/ HPK PID Workshop@Nagoya

  15. Fused Silica bar R & D Improved Polish and Finish Previous Polish Δt ~150ps even after 4m transition PID Workshop@Nagoya

  16. Time v.s. X plot (Beam test result) 2.5GeV/c pion @KEK-PS pi2 line on Nov,2001. 200k events concentrated plot Good relation of photon propagation time and X position at the edge is observed as expected. Preliminary! PID Workshop@Nagoya

  17. TOP Counter – Installed in Super-Belle Installing Belle detector… • r = 1m • 30 < q < 140barrel region P(K/p) q Υ（4s） → BB p+p- K+p- PID Workshop@Nagoya

  18. Bar TOP v.s. Mirror TOP(MC Study) Separability > 4 in whole coverage of Super Belle PID Workshop@Nagoya

  19. Summary • TOP Counter is a promising PID device at next-generation B factories. • R & D is in good shape. • Beam test results will be performed on Nov. PID Workshop@Nagoya

  20. DIRC (cont.) PID Workshop@Nagoya

  21. PID and B Physics • Flavor Tagging －Determine a flavor of B PK < 1.5 GeV/c • Rare Decays including K and p • － B->Kp/pp , DK/Dp • 2.0 < PK < 4.0 GeV/c PID Workshop@Nagoya

  22. PID System at Belle PID Workshop@Nagoya

  23. DIRC Improvement • Focusing DIRC • Photon Propagation Time SLAC-PUB-8989 The Next Generation of Internally Reflected Imaging Counters, Sep.2001 PID Workshop@Nagoya

  24. TOP Counter (cont.) • HPK R5900-U-L16　time res.　　７５ ps • channel width １mm 30 photons observed in typical case PID Workshop@Nagoya

  25. TOP Counter(Bar width) 50mm 100mm 150mm 200mm c2 K p K p K p p K qc qc qc qc The bar width should be 200 mm or larger in current analysis scheme. PID Workshop@Nagoya

  26. TOP Counter - Application • Detected #Photon : 30~100 PID Workshop@Nagoya

  27. TOP Counter - Separability Mom.　p = 4GeV/c, q ＝ 90° （L = 2m） S = 10 s PID Workshop@Nagoya

  28. Separability for B->pp PID Workshop@Nagoya

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