A cluster counting drift chamber for central tracking at ILC
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Transcript of A cluster counting drift chamber for central tracking at ILC
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
+ −
+ −
→
→
2 sint
t t
p ba
p p
δθ
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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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