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

** MPD NICAS. Chernenko, NECC2011, September 13, 2011

**Time Projection Chamber (TPC) TPC parametersSize: 3.4 m (length) x 2.2 m (diameter) Drift Length: 150cm# of samples: 50Electric field: 140V/cmMagnetic 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 areaTotal # of pads: ~80000

Performance

Spatial resolution: srf~300 mm sz~ 2 mm

Two track resolution < 1 cm

Momentum resolution Dp/p < 3% (0.2

**Field Cage RodsDiameter - 950 mmLength - 900 mmWall thickness - 2 mmMaterial Kevlar Readout MWPC: 6x12 & 4x10 mm padsGas Ar/CH4 (80/20)MPD TPC prototyping (2)MWPC readout MPD TPC read-out specificationReadout: 2x12 sectors Pad size: 5x12,5mm Total # of pads: ~80.000S. Chernenko, NECC2011, September 13, 2011

* 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/chS. Chernenko, NECC2011, September 13, 2011

* 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&DS. Chernenko, NECC2011, September 13, 2011

*STAR FEE Upgrade based on ALTRO+PASA (DAQ1000 )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.Zero suppression done at FEE in the Altro

Event transfer 16-20 times smallerCombined with slightly faster link, will allow rates ~1000-5000 hz

Event Buffering on FEE

TPC stays alive as long as throughput is < maxDeadtime only caused by TPC Drift..0.004% dead / hz readoutOld TPC featuresDAQ 1000 > 10 times fasterS. Chernenko, NECC2011, September 13, 2011

* Track Signals readout Pad Plane Prototype ~ 3.000 chsInduced charge on pads to FEES. Chernenko, NECC2011, September 13, 2011 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)

**64 chs FEE for TPC_MPD anode wirepad planedrift region 40 msL1: 6 kHzPASAADCRAM4 CHIPS x16 CH / CHIP

4CHIPSx 16 CH / CHIPCUSTOM IC(CMOS 0.35mm)CUSTOM IC (CMOS 0.25mm )TPC__MPD

80.000PADS1 MIP = 4.8 fCS/N = 30 : 1DYNAMIC = 30 MIP CSA SEMI-GAUSS. SHAPERGAIN = 12 mV / fCFWHM = 190 ns10 BIT< 10 MHz BASELINE CORR. TAIL CANCELL. ZERO SUPPR.MULTI-EVENTMEMORYFront-end Bus

gating gridALTROALTERA(control)ReadoutcontrollerALTROS. Chernenko, NECC2011, September 13, 2011

** Processing in PASA & ALTRO- FWHM 190ns- Baseline restoration after 1ms: ~ 5 % in amplifier / shaper ~ 0.1% in dig. chip PASA ALTRO

- Baseline corrections

- Tail cancellationS. Chernenko, NECC2011, September 13, 2011FWHM ~ 190ns

*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 2016S. Chernenko, NECC2011, September 13, 2011

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

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