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Readout Issues for the TPC/HBD Detector

Readout Issues for the TPC/HBD Detector. Craig Woody BNL. FEM/DAQ Upgrade Meeting October 24, 2002. PHENIX Central Region. Prime Real Estate ( accepting applications now). Detectors Proposed for the Inner Central Region. Silicon Vertex and Tracking Detectors

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Readout Issues for the TPC/HBD Detector

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  1. Readout Issues for the TPC/HBD Detector Craig Woody BNL FEM/DAQ Upgrade Meeting October 24, 2002

  2. PHENIX Central Region Prime Real Estate (accepting applications now) C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  3. Detectors Proposed for the Inner Central Region • Silicon Vertex and Tracking Detectors • Barrel pixel detector (~1.5M chs) • Endcap pixel detectors (~4.0 M chs) • Strip detector (~165K chs) • TPC/HBD • TPC (~80K chs) • HBD (4-5K chs) • NTC’ • Nose Cone Calorimeter (?) • Issues • Space • Power & cooling • Cables & fibers • Affect on other PHENIX detectors • Radiation length budget • Backgrounds for Muon Arms • Access and installation • Schedule C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  4. Electronics and Readout Issues for TPC/HBD • HBD • - Need to define segmentation of readout plane, gas gain,… • (  number of channels, electronic gain, input capacitance, noise,…) • - New ASIC or hybrid electronics ? • - Must be low mass (sits in main part of PHENIX acceptance) • TPC • - Low power ADC • - Analog memory vs direct digitization • - Sampling rate (20-25 ns), dynamic range (8-10 bits) • - Data volume (zero suppression) • - Optical links (1 Gbit  160 fibers, higher speed fibers,…) • Interface to PHENIX DAQ and trigger • - New DCMs • - Impact on Event Builder, trigger, etc. C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  5. HBD Readout Parameters Pad size: ~ 2 cm radius (r = 1.68 cm hexagons) Channel count: ~ 4-5 K (8x70x58/7.3=4430) Occupancy: ~ 20% for central Au+Au (w/4 layers of 1% Xo Si) • Main Question • How much of the readout electronics do we • put on the back of the readout plane ? • PS/SA only (  4-5K signal cables, • FEMs on edge of detector) • Full digitization (requires custom ASIC) Simulation by S. Milov - Central HIJING C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  6. Data Volume and Readout Speed for TPC Number of channels Aplane = p (552 - 202) = 8247 cm2 Apad = 1.0 x 0.2 = 0.2 cm2 Npad = 8247/0.2 = 41,233 x 2 = ~ 80K chs Readout Speed in PHENIX Buffer size < 40 beam clock ticks 40 x 100 ns (10 MHz) = 4 msec (EMCAL pushes this to 6.4 msec) Readout time < 40 msec (25 KHz in DCM) 800 Kb => 6.4 x 106 bits/40 x 10-6 sec = 1.6 x 1011 bits/sec = 160 Gbits/sec (20 Gb/sec) => 160 1Gbit fibers (TEC has 128) => 40 DCMs (TEC has 28) Data Volume 4 msec/20 ns => 200 time samples (8 bits) 80K x 200b ~ 16 Mb Assume zero suppression of 1/20 => 800 Kb (actual hit rate gives 80 Kb => 1/200) Trigger Expect actual trigger rate in pp to be ~104 Hz at L = 2 x 1032 (trigger rate of interesting events including W,Z,charm is only ~ 103 Hz) If data volume after final zero suppression is 80 Kb, then 80 Kb x 104/sec => 800 Mb/sec => need Level 3 trigger C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  7. Options for TPC Readout AMU + ADC readout Direct ADC readout To be discussed in Chi’s talk… C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

  8. T.Frawley UGW 5/7/02 Rates for Vector Mesons AuxAu Min. Bias: dN(p0)/dy=80, dN(r0)/dy=16, r0 -> e+e- = 4.5x10-5 PHENIX acceptance for f-> e+e- ~ 3.5% (assume same for r0) N(r0) = 2.5 x 10-5 per min bias event 240 mb-1 => 1.74x109 min. bias events => N(r0) = 44,000 (c.f. 8,000 J/y) Archive rate: 60 MB/s, 20% m.b.,180 kB/m.b. evt => 66 Hz m.b. archive rate 8 weeks at 25% overall duty factor => 8x107 m.b. events => N(r0) = 2000 Assume Level 2 trigger using HBD => 8 kHz to EvB 8 weeks at 25% overall duty factor => 9.7x109 events to EvB => N(r0) = 240,000 With Level 1 trigger -> 7x1010 m.b.events => N(r0) = 1.74x106 Not Enough Better Best C.Woody, FEM/DAQ Upgrade Meeting, 10/24/02

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