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F1 Contribution to TESLA Vertex Detector. Tobias Haas 13 Febuary 2001. Overview. Quick Summary of Previous Presentation Summary of Visits to Strasbourg and RAL Proposal F1/Uni HH Contributions. Vertex Detector Base Design. 5 Layers 20 x 20 m 2 pixel CCD Sensor thickness < 60 m
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F1 Contribution to TESLA Vertex Detector Tobias Haas 13 Febuary 2001
Overview • Quick Summary of Previous Presentation • Summary of Visits to Strasbourg and RAL • Proposal F1/Uni HH Contributions
Vertex Detector Base Design • 5 Layers • 20 x 20 m2 pixel CCD • Sensor thickness < 60 m • 799 Mpixels • Readout time 50 s
Sensor Technology Choices • MAPS (monolithic active pixel sensor) Visit of Strasbourg Group 3/4 December • Alternative to CCDs • CCD Very low power consumption Visit of RAL Group 29/30 January • SLOW • HAPS (hybrid active pixel sensor) • Insufficient granularity? • High power comsumption? • Too much material? • DepFets (MPI Munich)
MAPS … • Hi Resolution/Lo mass competitive with CCDs • Standard CMOS VLSI technology • Same substrate for detector and electronics • Radiation hardness (no bulk charge transfer)
MAPS R&D • Sensor Development • Mimosa IV Chip: 4 x 64x64 • Mimosa V coming • Backthinning • Mechanical Support as with CCDs • Radiation Hardness
Visit to Strasbourg 3/4 Dec • T. Carli, U. Kötz, W. Zeuner, T. Haas • Excellent overview of the current state of the project • Saw Mimosa IV working in the lab • Saw Chip design capabilities of LEPSI • Very impressed by the effectiveness of this small group • Our Collaboration would be very welcome.
CCDs … • … can be fairly large (100 x 25 mm2) • … requires column-parallel readout • … minimal amount of material per pixel • … charge transport over ~ cm (charge loss!)
CCD R&D • Readout speed • Clocking: 5 MHz (SLD) 50 MHz • Column-parallel readout • Thinning (Goal: 0.06% Xo /layer) • Mechanical • Substrate-free mounting? • Readout Chip • Bump-Bonding R/O chip to CCD
CCD Recent Developments • CCD Prototype (CCD 78) runs at 50 MHz (fully serial output) • Important results on support and packaging: • Thinned Si plates show transversal warping • Substrate may be unavoidable
Visit to RAL 29/30 Jan • E. Fretwurst, U. Kötz, G. Kramberger, B. Löhr, W. Zeuner, T. Haas • Excellent overview of the current state of the project • Saw CCD 78 working in the lab at 50 MHz (20 x 20 mm2 • The active group is much smaller than the list of names on the LCFI publications. • Very impressed by the effectiveness of this small group, particularly the younger people (Stefanov, Johnson) • Our Collaboration would be very welcome.
Conclusions from our Visits • Both CCDs and MAPSs appear to be on the right track for a TESLA VXD. • Both groups have signalled that they would very much welcome our collaboration. • There are a number of interesting topics where we could collaborate that • fit our interests, • are suitable for our capabilities.
Topics for Collaboration • Sensor Cooling (Engineering) • Simulations • Measurements • Radiation Hardness • Simulations • Test beam measurements • General Detector Design and Optimization • Simulations • Physics Studies • These topics are common to both technologies… …but the details are different!
Which Technology? • Both technology will probably be ready in time! • Do we need to decide? YES! • CCDs • Extremely elegant and potentially highest performance • Large homogeneous detectors • A working detector has been built with this technology (SLD VXD3) • Highly specialized technology that may depend on one company (Marconi) • MAPS • Performance matches CCDs • Commodity technology • Newcomer in this game!
What Arguments? Technological/Scientific Will the technology do the physics? Will it be ready in time? Will the technology be available at sufferable cost? Group/DESY Where can we have the highest impact? Sociological Who do we expect to collaborate with most effectively?
Proposal • 3 Teams (1 senior person + younger people to be recruited): • Set up a test stand for F1 & HH (Uli Kötz + X) • Start thinking about cooling (Bernd Löhr + Engineers + X) • Get involved in the MC and TESLA physics effort (T. Haas + X) • For the moment join the MAPS group.
CCD R&D: Support With Be Substrate 30 m Si + Be 0.12% Xo (Be: 0.09%) Substrate-free 0.04% Xo?