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FEE for TPC MPD__NICA JINR

FEE for TPC MPD__NICA JINR. Yu.Zanevsky, A.Bazhazhin, S.Bazilev , S.Chernenko , G.Cheremukhina, V.Chepurnov, O.Fateev, S. Razin, V.Slepnev, A. Shutov, V. Vereschagin, V.Zryuev. JINR, Dubna. S. Chernenko, NECC2011, September 13, 2011. 1. MPD NICA.

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FEE for TPC MPD__NICA JINR

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  1. FEE for TPC MPD__NICA JINR Yu.Zanevsky, A.Bazhazhin, S.Bazilev , S.Chernenko, G.Cheremukhina, V.Chepurnov, O.Fateev, S. Razin, V.Slepnev, A. Shutov, V. Vereschagin, V.Zryuev JINR, Dubna S. Chernenko, NECC2011, September 13, 2011 1

  2. MPD NICA S. Chernenko, NECC2011, September 13, 2011 2

  3. Time Projection Chamber (TPC) TPC parameters Size: 3.4 m (length) x 2.2 m (diameter) Drift Length: 150cm # of samples: 50 Electric field: 140V/cm Magnetic field: 0.5 T (max.) Gas: 90% Argon + 10% Methane (atm+2mbar) Readout: 2x12 sectors (MWPC+pads or GEM) Pad size – 4x10mm in inner sector area 6x12mm in outer sector area Total # of pads: ~80000 Performance Spatial resolution: srf~300 mm sz~ 2 mm Two track resolution < 1 cm Momentum resolution Dp/p < 3% (0.2<p<1 GeV/c) dE/dx resolution < 8% TPC prototyping has already started S. Chernenko, NECC2011, September 13, 2011 3

  4. MPD TPC prototyping (2) Field Cage Rods Diameter - 950 mm Length - 900 mm Wall thickness - 2 mm Material – Kevlar Readout – MWPC: 6x12 & 4x10 mm pads Gas – Ar/CH4 (80/20) MWPC readout MPD TPC read-out specification Readout: 2x12 sectors Pad size: 5x12,5mm Total # of pads: ~80.000 S. Chernenko, NECC2011, September 13, 2011 4

  5. Front End Electronics Requirement Total number of channels............80.000 Smax/N………………………….…..30:1 @ MIP, noise < 1000e- Dynamic Range…………………..1000 (10 bits) Shaping time ……………………..~200ns (smooth shape, S/N) Sampling ……………...................12.5 MHz Tail cancellation (after 1 s)……< 1% Temperature………………………~ 0.10 C (stable drift velocit) Pcons…………………..……………..40mW/ch S. Chernenko, NECC2011, September 13, 2011

  6. Front End Electronics Component Base FEE for TPC_MPD two ASICs from ALICE TPC : - PASA (analogue) - ALTRO (digital) REASONS - availability (total needed number of channels ) - reliability - good experience ● ALICE ~ 600.000 chs ● STAR ~ 140.000 chs(recent upgrade) - no long R&D S. Chernenko, NECC2011, September 13, 2011

  7. STAR FEE Upgrade based on ALTRO+PASA (DAQ1000 ) > 10 times faster DAQ 1000 Old TPC features • Zero suppression done at FEE in the Altro • Event transfer 16-20 times smaller • Combined with slightly faster link, will allow rates ~1000-5000 hz • Event Buffering on FEE • TPC stays alive as long as throughput is < max • Deadtime only caused by TPC Drift.. • 0.004% dead / hz readout • Zero suppression done at RB in the DAQ room • Full ~460,000 10 bit words transferred over each fiber. • 10ms readout time every event. 100hz max rate. • No event buffering on FEE • TPC dead during digitization & readout time. • 1% dead / hz readout. S. Chernenko, NECC2011, September 13, 2011

  8. Track Signals readout Induced charge on pads Pad Plane Prototype ~ 3.000 chs Data flow (rate) - 1MB @ event (Z-suppresion  10% occupancy) - 6kHz trigger  5 GB @ TPC ~ 2 Gb per chamber - fast trtransmission + on-line data reduction (upgrade STAR, ~100times) to FEE S. Chernenko, NECC2011, September 13, 2011

  9. Digital Circuit 64 chs FEE for TPC_MPD TPC__MPD ALTRO ALTERA (control) L1: 6 kHz 4 CHIPS x 16 CH / CHIP 4CHIPS x 16 CH / CHIP drift region 40 ms Front-end Bus ALTRO gating grid Readout controller PASA ADC RAM anode wire CUSTOM IC (CMOS 0.35mm) pad plane 80.000PADS CUSTOM IC (CMOS 0.25mm ) CSA SEMI-GAUSS. SHAPER 1 MIP = 4.8 fC S/N = 30 : 1 DYNAMIC = 30 MIP • BASELINE CORR. • TAIL CANCELL. • ZERO SUPPR. 10 BIT < 10 MHz MULTI-EVENT MEMORY GAIN = 12 mV / fC FWHM = 190 ns S. Chernenko, NECC2011, September 13, 2011 9

  10. Processing in PASA & ALTRO - FWHM – 190ns - Baseline restoration after 1ms: ~ 5 % in amplifier / shaper ~ 0.1% in dig. chip FWHM ~ 190ns PASA ALTRO - Baseline corrections - Tail cancellation S. Chernenko, NECC2011, September 13, 2011 10

  11. Conclusion - TPC is optimal tracking Detector for MPD ( high multiplicity environment, possibility for dE/dx measurement ) - TPC prototyping is in a good progress now ( development of field cage, pad plane, FEE and so on; test with the laser ) - FEE is based on ALTRO and PASA chips (ALICE TPC) ALTRO and PASA are available and can provide all required parameters - FEE prototyping is being planned to be completed in 2012 - TPC installation into MPD is being planned to be completed in 2016 S. Chernenko, NECC2011, September 13, 2011 11

  12. Thank you for attention S. Chernenko, NECC2011, September 13, 2011 12

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