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A cluster counting drift chamber for central tracking at ILC

INSTR08 Novosibirsk. A cluster counting drift chamber for central tracking at ILC. Roberto Perrino INFN Lecce. Mar 1, 2008. Outline. Tracking requirements at the ILC Low density DCH + Cluster counting Expectations for the CluCou DCH (ILC 4 th Concept)

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A cluster counting drift chamber for central tracking at ILC

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  1. INSTR08 Novosibirsk A cluster counting drift chamber for central tracking at ILC Roberto Perrino INFN Lecce Mar 1, 2008

  2. Outline Tracking requirements at the ILC Low density DCH + Cluster counting Expectations for the CluCou DCH (ILC 4th Concept) CluCou R&D Program Status of the Experimental Tools Summary and outlook INSTR08 Novosibirsk

  3. LHC machine for discovery machine for precision measurements Which precision? Unbiased benchmark case:Higgs detection at the ILC • A golden channel for SM Higgs: • Z decay is tagged by clean l +l _ decays H-mass measured independent of decay channel, because of constrained kinematics [ ILC-Reference Design Report - Vol.I ]

  4. ILC-type TPC + 5 layers of Si pixels How to meet PT resolution requirements? KLOE-type DCH m New DCH with potential m We can operate on both arms of Light-mass DCH He+wires Higher position resolution track sampling [G. Tassielli, Doctoral Dissertation, Feb 2008] 0.5 % X0 Greatly Improves pT<25GeV/c m Greatly Improves pT>25GeV/c

  5. With lesson learned from e.g. KLOE and BaBar He-based mixture Low drift velocity (2.5 times less than Ar) [C. Grupen - Particle Detectors - Cambridge U. Press] Low ionization density along track (5 times less than Ar) 0.4 ns/chan mip crossing 2cm radius drift tube He+iC4H10 (90/10) Read-out elx Expect that single electron counting can efficiently be performed Risetime ns Sampling rate Gsa/s

  6. A cluster counting central DCH for future experiments at ILC (4th Concept proposal) • KLOE-like DCH • CluCou (≥1GHz; ≥2 GSa/s; 8 bit) • 1.5m track-length; ~125 points/track; = 60 m • He-based mix ⇒ contribution to m.s.~0.15% X0 • 60K Hex 0.6-0.7cm cells in 20 s_layers • Full stereo U-V ±72-180mrad • 60K 20m sense wires; 120K 80m Ewires • Uniform sampling over >90% of volume • Position resolutions: b= 60 m ; z= 300 m • PID resolution ~2% through dNcl/dx Design and construction of such type of chamber relying on robust engineering calculations and consolidated carbon fiber technology (e.g. KLOE, Novosibirsk DCH)

  7. Expectations for CluCou DCH @ ILC 4th Concept Simulation in the ILCRoot framework: e+e- → HZ → X + µ+µ- √s=230GeV @500 fb-1 [G. Tassielli, Doctoral Dissertation, Feb 2008]

  8. Software simulations (Garfield, Magboltz): • control of the gas transport parameters • electrical characterization of drift cell • measurability of single electron • FE elx transfer function The CluCou R&D Program Simple cosmic ray experimental setup (drift tubes, trigger, fast digital scope) Development of fast FE VLSI ASIC (preamp, shaper, ADC, buffer) Precision strip tracker for detailed study DCH small scale prototype construction CR-test and beam-test of DCH prototype • Waveform analysis and cluster counting algorithms

  9. CLUCOU Simulation: Gas parameters Based on packages: HEED, MAGBOLTZ, GARFIELD9 and ROOT Clusters Poisson ionization statistics Number of clusters/cm and e-/cluster Electron Landau ionization statistics He-iC4H10 Working Point [G. Chiodini - SuperB Detector R&D - Slac Feb 2008]

  10. CLUCOU simulations: FE response Peak Finder after Front-End Phase Gain ~1MHz ~3GHz [G. Tassielli, Doctoral Dissertation, Feb 2008] Atlas internal note MUON-NO-105 (1995) and PS-SPICE

  11. CluCou Measurements • Scintillator trigger • Drift tube: r = 1.4cm L=30 cm • He 90% + iC4H1010% • Sense wire 25m ∅ • HV V • 10 × Preamp @ bw=500 MHz • 2.5 Gsa/s 4GHz bw digital scope tFIRST tLAST • Slow control parameters continuosly monitored (HV, Temp, Press, GasFlow) tdr t

  12. DriftTime “white” spectrum High # of peaks Little Impact Parameter “Confidence gaining” results Short arrival time R=1.2 cm t=900 ns R=2.0 cm Look forward to select impact parameter with micrometric tracker

  13. A precision tracking telescope

  14. CLUCOU measurements: Si-Telescope (I) TTL Trigger In ILLINOIS adapter board FNAL Mezzanine XILINX FPGA Drift tube Under test FNAL PTA card ALTERA FPGA [G. Chiodini - SuperB Detector R&D - Slac Feb 2008] PCI bus Daisy-Chain6 CDF Run2b modules LV Power Supply Linux OS HV caen • Hardware ready • Firmware ready • Software to finalize for: • tracking • analysis • Two Si-modules already readout in daisy chain • External trigger readout • 6 modules + 4 spare available • Mechanical assembly and HV ready. • Module~4x18 cm2 = • 1 hybrid+ 2 Si sensor: • 8 bit ADC • p+/n sensors • 75um readout pitch with intermediate floating strips Many thanks Fermilab ESE department and Thomas Junk (IL Urbana University) !!!

  15. CLUCOU measurements: Si-Telescope (II) Si - telescope and Device Under Test. Only one Si plane shown out of 6. 6 plane microStrip-Si telescope [G. Chiodini - SuperB Detector R&D - Slac Feb 2008] • Full adjustable angles 1.20 step • Easy to upgrade to more planes Next: Tracking on cosmics - X0 Material not optimized yet

  16. Technology = 0.13 µm CMOS Core area = 2.4 mm2 The CluCou Chip Design specs Preamp: Programmable DC-gain 0-20 dB BW 500 MHz @ -3 dB Input-referred noise = 52Vrms wrt drift tube output noise of 100Vrms ADC: Resolution = 6 bits Sample rate = 1GSa/s FS input range = 160mV [S. D’Amico - Proc. IWASI2007 - Bari June 26-27, 2007]

  17. CluCou FE Chip test plan Feb 18th 2008: 70 chips delivered Feb 22nd 2008: Test boards delivered In the course of setting-up bench tests (electrical, general functionality) BENCH TESTS: Polarization: control of absorbed current and output voltages Characterization of variable gain amplifier prior to ADC Frequency response for different gains Noise and linearity Characterization of the ADC S/N ratio evaluation + distorsion Last Word from TESTS ON DETECTOR’s FE

  18. In progress this year: • Bench tests of the 70 pre-production CluCou chips; get conclusions within 2008 • Further development of peak-counting algorithms for efficient waveform analysis • Setting-up microstrip telescope for detailed study of the ionization statistics, r-t relation and resolution • Event-by-event measurements on drift tubes with the CluCou chip and a commercial board (National Semiconductors) for performance comparison On the longer run (2009) • Design and build a prototype DCH w/ 50 cells fully equipped with FE elx • Test of the prototype DCH with cosmics • Test of the prototype DCH in a testbeam Summary & Outlook The CluCou Collaboration is exploring the introduction of a very light He-based DCH with cluster counting capabilities Exploration of new light materials for wiring (carbon, polyester, as thin as 10m) Solution applicable to ILC for pushing to extreme resolution on momentum measurements (or to SuperB Factories for PID with ionization density measurement) MC computational tools developed for exploring the improvement of single point position resolution to 50m VLSI ASIC designed for 1 GHz bw and 1 Gsa/s 6 bit waveform sampling; first 70 out of foundry ready for testing Experimental tools for consistency check of simulations with drift tubes and cosmic rays INSTR08 Novosibirsk

  19. Credits The CluCou Collaboration F. Grancagnolo[1], A. Baschirotto [2,1], G. Chiodini[1], P. Creti[1], S. D’Amico[2,1], M. De Matteis[2,1], M. Panareo[2,1], R. Perrino[1] , S. Spagnolo[3,1], G.F. Tassielli[3,1] 1) INFN Lecce 2) Università del Salento, Dipartimento di Ingegneria dell’Innovazione, Lecce 3) Università del Salento, Dipartimento di Fisica, Lecce INSTR08 Novosibirsk

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