Transcript LHCb Inner Tracker Poster

The LHCb Inner Tracker
The LHCb Inner Tracker
LHCb:
covers the high
particle density region near the beam pipe and the
bending plane of the magnet in the tracking
stations behind the magnet with
Silicon Strip detectors. The total area of Silicon is
~4.3m2
is a single-arm forward
spectrometer dedicated to B-physics
acceptance: 15-300(250)mrad:
•
covers the large
surface area with
straw tube
detectors
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The Inner Tracker:
The Inner Tracker consists of
•4 individual boxes per station
•4 layers per station: (2 stereo layers)
336 modules: 11 and 22cm long
129k readout channels on 4.3m2 silicon
silicon strip detectors
• 1.3% of the acceptance
• 20% of the tracks
minimize: R/O channels  large pitch O(200mm)
(limits charge collection)
 long strips 22cm (noise)
40MHz, fast readout  (noise)
minimize material
 “thin” sensors
(limits amount of charge)
The Inner Tracker Silicon Module
Carbon Fibre (CF)
support produced out of
high thermal conductive
fibre used to cool the
sensors and the
detector box
cooling “balcony” for
mounting and positioning
of the ladder on the
supporting cooling rod
which is connected to the
liquid cooling system
•Sensors
•Kapton
•Carbon Fibre
•AIREX faom
•Carbon Fibre
•operation at ~5°C
•liquid C6F14 cooling
system for cooling
readout hybrid and sensors
•thermally conductive CF support
•box enclosure lightweight isolation foam +
Al foil for electrical shielding
•the analog signals from the readout hybrids
are sent via 5m copper cables to the service
boxes outside of the acceptance where they
are digitised
p-n silicon micro-strip
Hamamatsu sensors
384 AC coupled
readout strips
108 mm long strips,
197mm pitch, w/p=0.25
320(410)mm thickness
The Inner and Outer Tracker Support
The Inner and Outer Trackers have individual rail
systems on a common support structure. This
allows individual access to both sub-detectors and
their electronics
Outer Tracker
Unlike vertex detectors we have:
• moderate spatial resolution requirement (~60mm)
• moderate radiation environment. After 10 years:
1 Mrad or 9·1012cm-2 of 1 MeV Neutron equiv. in IT
But we need to cover a large detector area:
The Outer
Tracker:
The Inner Tracker Layout
The Challenges
Inner Tracker box
readout hybrid with 3
Beetle chips in 0.25mm
CMOS technology
operating at 40MHz. The
128 channel front-end
signals are pipelined for
160 bunch crossings. The
output data are
multiplexed on 4 readout
ports allowing for a
readout in 900ns after a
trigger.
rail system
Production of Inner Tracker Modules
the readout hybrid is glued
together with the pitchCF support bars adapter to the CF-support
Service boxes where the analog signals
from the readout chip are digitised and
then optically transmitted to the counting
house where they are further processed
 TELL1
sensors are positioned according to
their edges on a special jig, picked
up by a vacuum tool and placed on
the CF-support, where glue is
applied using a glue dispenser
bonding machine used to
make the electrical
connection between
readout hybrid,
pitch-adapter and
sensors