Transcript Document 7621888

Research on a Next Generation
Vertex Detector
• Develop new vertex
technology to measure
charmed quarks
• Do sufficient R & D so
that we can prepare a
proposal for a complete
detector inside STAR.
• Technology suitable for
LHC and the Linear
Collider
l
20 m square pixels
5
5.6 cm
8 cm
20
chips per slat
90
million pixels
40
m thick chips
Problems
Expected Position of D0
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Most charm mesons decay within
100 µ of interaction. Need high
accuracy and very thin detector.
SLD CCD vertex detector - subject
to radiation damage - too thick – too
slow to read out.
APS (active pixel sensor)
technology in infancy. Only one
group doing tests.
No R & D on our specific
requirements.
Simulation of current technology 250,000 events.
Solution
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Show CMOS APS technology can
work.
Develop fast method for reading data
(zero suppression).
Develop mechanical support
structures for 40 µ thick CMOS
chips. Achieve mechanical
tolerances.
Explore options to make a thinner
and smaller diameter beam pipe.
Simulation of new technology
Simulation (250,000 events)
First Test Results
Sr90
No Source
First test results
MPgnd
MGsnd
No Source event
Sr90 event
First test results
MGsnd
MPgnd
No Source event
Sr90 event
First tests
MGsnd
MPgnd
No Source event
Sr90 event
First events
MGsnd
MPgnd
No Source event
Sr90 event