July 14 2003US LC Workshop Cornell U – Chris Damerell 1 A CCD-based vertex detector Chris Damerell on behalf of the LCFI Collaboration Project overview.

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Presentation transcript:

July US LC Workshop Cornell U – Chris Damerell 1 A CCD-based vertex detector Chris Damerell on behalf of the LCFI Collaboration Project overview and design principles R&D programme Development of novel CCDs and readout electronics Development of thinnest possible detector layers Physics studies Summary and future plans

July US LC Workshop Cornell U – Chris Damerell 2 Project overview Linear Collider Flavour ID Collaboration: Bristol U, Lancaster U, Liverpool U, Oxford U, QMUL and RAL R&D assumes up to 5 CCD development cycles at intervals of ~20 months Initially funded by PPARC for £2.3M for 3 yrs from April 2002 (£700K equipment, £1600K PPARC manpower) Synergy with recent PPARC plans to play a major part in the LC BDS (beam delivery system) Working to develop closer ties between other regional VTX activities. Our international phone conference at time of US workshop at UT Arlington was a major success Looking forward to one international collaboration to build the LC vertex detector, once prototype ladders have enabled the technology choice to be made One major unknown in the decision process is the accelerator technology

July US LC Workshop Cornell U – Chris Damerell 3 Design principles 5 layers, inner layer at radius mm 3-hit coverage to cos  = 0.96 thin layers (<0.1% X 0 ) for minimal mult scatt and  conversions

July US LC Workshop Cornell U – Chris Damerell 4 silicon pixels of size ~ 20  m square for low cluster-merging in jets support structure with micron precision/stability (specially important for oblique tracks near ladder ends) on-detector signal processing, so almost no external connections power dissipation measured in few tens of watts, so gas cooling sufficient ( vital for low material budget) ‘adequate’ radiation hardness readout time ~  ms for JLC/NLC (between bunch trains) ~ 50  s for TESLA (20 frames/bunch train) crucial for efficient charm ID (1-prong decays), vertex charge (Bs), but quantitative physics examples still being worked on …

July US LC Workshop Cornell U – Chris Damerell 5 Novel CCDs and readout electronics CCD sizes similar to SLD, but readout needs to be times faster eliminate bulky electronics which would degrade fwd tracking and calorimetry total of 800 Mpixels, cf 307 Mpixels for SLD TESLA readout requirement stimulated concept of ‘column parallel’ operation innovative CCD/CMOS hybrid. If successful, this architecture may also be preferred for NLC/JLC. However, for this case, the conventional architecture with a multiple-output linear register should also be evaluated

July US LC Workshop Cornell U – Chris Damerell 6 “Classic CCD” Readout time  N  M/F out N M N Column Parallel CCD Readout time = N/F out Max possible readout speed, for given noise performance Readout IC (amp+ADC on 20  m pitch) only became available with deep submicron CMOS technology TESLA requires parallel register clocking at 50 MHz: 1 MHz is fine for NLC

July US LC Workshop Cornell U – Chris Damerell 7 electronics only at the ends of the ladders bump-bonded assembly between thinned CPCCD and readout chip readout chip does all the signal processing, yielding sparsified digital data CPCCD is driven with high frequency, low voltage clocks low inductance layout required for clock delivery

July US LC Workshop Cornell U – Chris Damerell 8 Standard 2-phase implant Metallised gates (high speed) Metallised gates (high speed) Field-enhanced 2-phase implant (high speed) Source followers Source followers Direct 2-stage source followers To pre-amps Readout ASIC Readout ASIC Features of our first CPCCD: 2 different charge transfer regions 3 types of output circuitry Independent CPCCD and readout chip testing possible: without readout chip - use external wire bonded electronics without bump bonding - use wire bonds to readout chip finally, bump-bonded Different readout concepts can be tested (direct charge sensing, and voltage sensing via source follower)

July US LC Workshop Cornell U – Chris Damerell 9 Direct connections and 2-stage source followers 1-stage source followers and direct connections on 20 μm pitch CPC-1 delivered & under test

July US LC Workshop Cornell U – Chris Damerell 10

July US LC Workshop Cornell U – Chris Damerell 11 Single pixel events seen in one column of CPC-1 with 2 V peak-peak clocks

July US LC Workshop Cornell U – Chris Damerell 12 FIFO bit flash ADCs Charge Amplifiers Voltage Amplifiers Wire/bump bond pads

July US LC Workshop Cornell U – Chris Damerell 13

July US LC Workshop Cornell U – Chris Damerell 14 Thinnest possible detector layers 3 approaches Unsupported silicon Semi-supported silicon Supported silicon Unsupported approach attractive – ‘like wires in a drift chamber’ Works beautifully along ladder length (sagitta stability around 2 microns) However, processed thin CCD is not like a wire: it’s an inhomogeneous membrane in which transverse stresses may lead to somewhat uncontrollable shape Also, we have concerns about handling issues, for attaching readout chips etc Not abandoned, but semi-supported approach may be more practicable

July US LC Workshop Cornell U – Chris Damerell 15

July US LC Workshop Cornell U – Chris Damerell 16 CCD brought down Assembly after shim removal and curing Beryllium substrate (250 μm) Beryllium substrate with adhesive balls Thinned CCD (  20 μm) Adhesive Shims 1 mm 0.2mm

July US LC Workshop Cornell U – Chris Damerell 17

July US LC Workshop Cornell U – Chris Damerell 18 Physics studies The design of the VXD should be driven by the physics requirements: 4 configurations, 5 layer single thickness and 4 layer double thickness, and other combinations make single muon and pion tracks in Brahms for all momenta and angles. Fit the distributions include the parametrizations in Simdet biggest effect comes from removal of the inner layer provide to physics groups

July US LC Workshop Cornell U – Chris Damerell 19 5layers 4 layers, double Clear performance difference between configurations Charm suffers most, B tagging is “easy”

July US LC Workshop Cornell U – Chris Damerell 20 New procedure to attach track to vertices Charged B, up to 89% correct tag, 6-8% worse for 4 layer double thickness configuration Charged D, excellent purity, less difference between configurations

July US LC Workshop Cornell U – Chris Damerell 21 Neutral B: dipole Maintain, develop and improve tools Provide them to the physics community so we can get feed- back on detector parameters from various physics channels Make a transition to Java/JAS environment

July US LC Workshop Cornell U – Chris Damerell 22 Summary and future plans Fast CCDs: much to study with CPC-1 tentative plan for design/production of CPC-2 (including detector- scale prototypes, 10x2 cm 2 ) Oct 2003-June 2004 readout chips CPR-1 and CPR-2 all we need in medium term future Thin ladders: semi-supported assemblies with a well-behaved adhesive may be fine, including satisfying the bump-bonding assembly requirements numerous alternative ideas, some (fortunately) being pursued by other groups – notably the DEPFET collaboration Physics studies: totally dependent on available effort, a small but dedicated team Major opportunities for wider collaboration in all areas, and informally it is happening