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Use of ALICE T0 Electronics for BPTX Readout

Use of ALICE T0 Electronics for BPTX Readout. David Evans. The T0 detector in ALICE Requirements of the T0 detector and electronics Timetable / Progress of T0 system Suitability for BPTX What next ?. Purpose of the T0 Detector. T0 is a triggering detector for level 0 trigger

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Use of ALICE T0 Electronics for BPTX Readout

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  1. Use of ALICE T0 Electronicsfor BPTX Readout David Evans • The T0 detector in ALICE • Requirements of the T0 detector and electronics • Timetable / Progress of T0 system • Suitability for BPTX • What next ?

  2. Purpose of the T0 Detector • T0 is a triggering detector for level 0 trigger • Gives rough on-line vertex • Beam-gas suppression • Gives rough on-line centrality measurement for trigger • Acts as pre-trigger for TRD

  3. Position of T0 in ALICE T0L -5 < h < -4.5 T0R2.9 < h < 3.3 3.5 m 0.7 m

  4. T0– the final configuration: • Two arrays of 12 PMTs with quartz radiators • T0 Right ( + 0.7 m) • T0 Left ( - 3.5 m) • Two shoe boxes of fast electronics inside the magnet (+5 m and –5 m) • Few creates of electronics outside the magnet • Laser calibration system also outside the magnet

  5. Requirements of T0 • Precise timing (50 ps) • Fast read-out (used for L0 trigger) • Event spacing 25 ns (pp) L1 L2 T =L1 /c –L2 /c L1 L2 T = (L1+L)/c – (L2 - L)/c = (L1-L2)/c + 2 L/c = T0 + T L Gives vertex to 7.5 mm

  6. Output Signals • T0 = (tr- tl)/2+t • T0v = tr-tl (ON/OFF adjustable during run) • T0-L, T0-R, Coinc • Time and energies (all 24 PMTs) • 3 levels of sum energy • Low • Medium • High

  7. T0 Timescale / Progress • Draft TDR completed • Final TDR by end of 2003 ? • Prototype of T0 completed • Electronics prototypes completed • Final choice of timing discriminators to be made • Final configuration of readout electronics to be chosen • Still no final cost estimate (but may use TOF timing electronics – if so, cost per channel ~ 20 SFrs for preamplifiers, shapers and timing). • Production should be completed by July 2005

  8. Suitability for BPTX ORTEC pico-TIMING TMDiscriminator Model 9307 Accept inputs pulse widths from 400 ps to 5 ns Time slewing (walk) < 20 ps from -150 mV to -1.5 V (Typically < 50 ps for signal amplitudes from -50 mV to –5V.) Accepts burst rates up to 100 MHz Operating temperature range 0 to 50C Note: timing of 50 ps is for whole system. Electronics alone have timing better for 30 ps (~ 25ps) i.e. vertex to ~ 4mm.

  9. What Next ? Need to clarify some information from the BPTX i.e. what is the physical form of the pulses (including width and height) ? Need to sit down and talk to T0 group, after their holidays, in order to go through the details. In summary, ALICE has fast (< 30ps) electronics that we should be able to utilise. Cost of special module for BPTX should be “peanuts” !!

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