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CDC Readout

CDC Readout. - upgrade for Higher Luminosity -. Y.Sakai (KEK). Review of Status/Plan (based on materials from S.Uno/M.Tanaka). 29-Oct-2002. TRG/DAQ WS @OCU. Introduction. CDC will work at L = 10 35 → ?? x10 35. with some mod/improvement (a la S.Uno) [ small cell type CDC with R>15cm].

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CDC Readout

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  1. CDC Readout - upgrade for Higher Luminosity - Y.Sakai (KEK) Review of Status/Plan (based on materials from S.Uno/M.Tanaka) 29-Oct-2002 TRG/DAQ WS @OCU

  2. Introduction CDC will work at L = 1035 → ?? x1035 with some mod/improvement (a la S.Uno) [ small cell type CDC with R>15cm] (Basic assumption) CDC readout Electronics to be designed to work up to CDC Hardware Limit (T0 Timing device is not included here)

  3. Requirement: CDC Basically same as present one • Tracking: Position Resolution (s~130um) • P-id: dE/dx (s~6% for MIPS) [ Trigger signals → not issue here (Y.Iwasaki)] Higher Lum. Machine : higher beam current High hit rate : 100~200KHz Smaller Cell (~7mm? ← 15~18mm) Fast Gas (80~100um/ns ← <40) Max. Drift time (Tmax) : ~100 ns ← 400ns

  4. CDC Hit Rate (present) • Hit rate of innermost part • ＞100KHz • chamber itself is working • Other layers: ~5KHz • → OK with higher • beam current • (>20 times higher BG) Radius = 15cm

  5. QT Deadtime & Efficiency Belle CDC Innermost 2 layers QT board replaced QT conv. Dead time ~700ns June-2002 Number of hits used in track Chamber Efficiency itself is OK with >100KHz hit rate ~200ns Oct-2002

  6. Fast Gas : CH4 80~100us/ns • dE/dx resolution : similar to He(50)/C2H6(50)

  7. CDC Readout Requirement Basically same as present one (except dead time) Normal ! Time Info. a la Tanaka-san sT~130um/vdrift → 1.3~1.6ns (v=80~100um/ns) ~0.5 ns LSB (1 ns maybe OK), Range ~ 2Tmax Charge Info. Dynamic range: >40MIPS sQ ~ sPED << ssig ~20% Linearity : < 0.5~1% Min. 10 bits (11~12 preferred) CDC hardware limit Dead Time/hit : CDC intrinsic = Tmax ~100ns < 500ns (10% @200KHz， ~Tmax preferred) Dead Time/trig. : < 3us (10%@30KHz) “Pipeline”

  8. Possible Choices Total number of channels : ~15K (← 8.4+1.8K) Preamp/Shaper : conventional one is OK thin & smaller : small cell size, less material Digitizers (I) FADC only - 100MHz, 8~9bit, data compression (II) “QTC” + TDC [TDC only] - Charge integ. QT: conversion dead time - TOT type: accuracy ok for dE/dx ? (III) TDC + slow ADC - TMC based TDC + 10~20MHz FADC (10bit)

  9. M.Tanaka (I) (II) (III) (A) (B)

  10. Component for T & dE/dx measurements(I) • 10bit 200MHz FADC • Performance : no problem • Power : problem ~1W/ch • 100MHz,8bit? Possible just do it. No R&D required • Alternative solution : Analog memory with deconvolution function ASIC  low power! R&D going on

  11. Component for T & dE/dx measurements(II) ASDQ on Flex circuit (K.Tauchi) Analog: preamplifier (Gain=1.5 mV/fC, 1.5ns rise) Shaping: Pole-zero cancel. (25 mV/fC, 5ns 0-paek, <2% undershoot) Discriminator: Baseline Restorer (fully differencial, AC cpoupling) Q-measurement: Time-over-Theshold, Width ~log(Q) Full range 120 fC Chip: 5.4x3.9mm2 PQFP, Rad-hard analog bipoler 8ch, 40mW, Noise ~2300e (10pF inp.cap)

  12. Component for T & dE/dx measurements(II) (continued) • ASDQ+TDC(TMC based) System is working • Enough performance for timing measurement • Need detailed study for dE/dx measurement Timing resolution<1nsec & (K.Tauchi)

  13. COPPER (DAQ platform) User I/O board FINESS

  14. Component for T & dE/dx measurements(III) • Conventional way • TDC  TMC core 24ch/FINESS 96ch/COPPER • ADC  10bit 20MHz HFADC 8ch/FINESS 32ch/COPPER FINESS development is on going (Trigger out to be considered) Dense implementation  ASIC(next. step)

  15. ASIC core development • HFADC core (for ADC FINESS ) • ~10bit • <20MHz • 0.5~4.5V • TMC core (for TDC FINESS) • 0.2~1ns • AMC core (for waveform sampler FINESS) • 64 samples • Analog BW < ?? TADC FINESS ASIC with (ADC+TDC) (goal)

  16. Component for COPPER I/F • L1 pipeline storage  T.Higuchi talk • One example This will be implemented in FINESS-proto for debug of COPPER

  17. Data Size (comments) (May-2001) Belle CDC: ~ 2KB + 50 * cdccur0 (~3KB=375 hits @L=3x1033 (cdccur0=20uA) → ~10KB @L=1035 (~1250 hits) (now it is smaller)

  18. Summary CDC upgrade for Higher Luminosity Readout Electronics: requirements can be satisfied with available technology R&D in progress, but still need more work We are looking for person/group to work on CDC upgrade for Electronics R&D and implement (work with Tanaka-san) and for Construction / installation

  19. Additionally… • Possibility of new TMC development project using 0.18um CMOS processModification for our purpose may be….. • Y. Arai san’s talk !!!Specification should be discussed asap

  20. Belle CDC (schematic)

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