A cluster counting drift chamber for central tracking

at ILCRoberto Perrino

INFN Lecce

INSTR08 Novosibirsk

Mar

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

INSTR08 Novosibirsk

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

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LHC machine for discovery

machine for precision measurements

[ ILC-Reference Design Report - Vol.I ]

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Which precision?Unbiased benchmark case:Higgs detection at the ILC

e e ZH

Xμ μ

+ −

+ −

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2 sint

t t

p ba

p p

δθ

= ⊕

How to meet PT resolution requirements?

ILC-type TPC + 5 layers of Si pixels

KLOE-type DCH μm

New DCH with potential μm

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Light-mass DCHHe+wires

Higher position resolution track

sampling

0.5 % X0 Greatly

ImprovespT<25 GeV/c

μm Greatly

ImprovespT>25 GeV/c

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He-based mixtureLow drift velocity(2.5 times less than Ar)

Low ionization density along track (5 times less than Ar)

Read-out elxRisetime ns

Sampling rate Gsa/s

Expect that Expect that single electron single electron countingcounting can efficientlycan efficiently bebe performedperformed

0.4 ns/chanmip crossing2 cm radiusdrift tubeHe+iC4H10

(90/10)

With lesson learned from e.g. KLOE and BaBar

A cluster counting central DCH for future experiments at ILC(4th Concept proposal)

Design and construction of such type of chamber relying on robust engineering calculations and consolidated carbon fiber technology (e.g. KLOE, Novosibirsk DCH)

KLOE-like DCH

CluCou (≥1GHz; ≥2 GSa/s; 8 bit) 1.5 m track-length; ~125 points/track; = 60 μm He-based mix ⇒ contribution to m.s.~0.15% X0

60K Hex 0.6-0.7 cm cells in 20 s_layers Full stereo U-V ±72-180mrad 60K 20 μm sense wires; 120K 80 μm Ewires Uniform sampling over >90% of volume Position resolutions: b= 60 μm ; z= 300 μm PID resolution ~2% through dNcl/dx

Expectations for CluCou DCH @ ILC 4th Concept

Simulation in the ILCRoot framework:

√s=230 GeV @ 500 fb-1

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e+e- → HZ → X + µ+µ-

The CluCou R&D Program

id

b• Software simulations (Garfield, Magboltz):

•control of the gas transport parameters•electrical characterization of drift cell•measurability of single electron •FE elx transfer function

Simple cosmic ray experimental setup (drift tubes, trigger, fast digital scope)

Development of fast FE VLSI ASIC (preamp, shaper, ADC, buffer)

Precision μstrip tracker for detailed study

DCH small scale prototype construction

CR-test and beam-test of DCH prototype

• Waveform analysis and cluster counting

algorithms

CLUCOU Simulation: Gas parameters

He-iC4H10 90%-10% 85%-15% 80%-20%

ncl/cm 11.3 15.3 19.6

nel/ncl 1.60 1.62 1.62

Based on packages: HEED, MAGBOLTZ, GARFIELD9 and ROOT

Number of clusters/cm and e-/cluster Clusters Poisson ionization statistics

He-iC4H10

Working Point

Electron Landau ionization statistics

[G. Chiodini - SuperB Detector R&D - Slac Feb 2008]

CLUCOU simulations: Peak Finder after Front-End

Atlas internal note MUON-NO-105 (1995)and PS-SPICE

Gain Phase~1MHz ~3GHz

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FE response

CluCou Measurements

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Scintillator triggerDrift tube: r = 1.4 cm L=30 cmHe 90% + iC4H10 10%Sense wire 25 μm ∅HV V10 × Preamp @ bw=500 MHz2.5 Gsa/s 4GHz bw digital scope

Slow control parameters continuoslymonitored (HV, Temp, Press, GasFlow) tdr t

tFIRST tLAST

“Confidence gaining” results

R=1.2 cm

R=2.0 cm

t=900 ns

High # of peaks

Short arrival timeLittle Impact Parameter

DriftTime “white” spectrum

Look forward to select impact parameterwith micrometric tracker

A precision trackingtelescope

CLUCOU measurements: Si-Telescope (I)

Linux OS

FNAL PTA card

FNAL Mezzanine

PCI bus

XILINX FPGA

ALTERA FPGA

ILLINOIS adapterboard

Daisy-Chain6 CDF Run2b modules

Module~4x18 cm2 =1 hybrid+ 2 Si sensor:• 8 bit ADC• p+/n sensors• 75um readout pitch with intermediate floating strips

HV caen

LV Power Supply

TTL Trigger In

• 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.

Drift tubeUnder test

Many thanks Fermilab ESE department and Thomas Junk (IL Urbana University) !!!

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Si - telescope and Device Under Test.Only one Si plane shown out of 6.

6 plane microStrip-Si telescope

Next: Tracking on cosmics- X0 Material not optimized yet

CLUCOU measurements: Si-Telescope (II)

• Full adjustable angles 1.20 step• Easy to upgrade to more planes

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QuickTime™ and a decompressor

are needed to see this picture.The CluCou ChipThe CluCou Chip

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Technology = 0.13 µm CMOS Core area = 2.4 mm2

ADC: Resolution = 6 bitsSample rate = 1 GSa/sFS input range = 160 mV

Preamp: Programmable DC-gain 0-20 dBBW 500 MHz @ -3 dBInput-referred noise = 52 μVrms

wrt drift tube output noise of 100 μVrms

[S. D’Amico - Proc. IWASI2007 - Bari June 26-27, 2007]

Design specs

CluCou FE Chip test CluCou FE Chip test planplan

Last Word fromTESTS

ON DETECTOR’s FE

BENCH TESTS:Polarization: control of absorbed current and output

voltagesCharacterization of variable gain amplifier prior to ADC

Frequency response for different gainsNoise and linearity

Characterization of the ADCS/N ratio evaluation + distorsion

Feb 18th 2008:70 chips delivered

Feb 22nd 2008:Test boards delivered

In the course of setting-up bench tests(electrical, general functionality)

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 μm) 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 μm 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

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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

CreditsThe 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 Lecce2) Università del Salento, Dipartimento di Ingegneria

dell’Innovazione, Lecce3) Università del Salento, Dipartimento di Fisica, Lecce

INSTR08 Novosibirsk

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