Speaker
Petra Riedler
(CERN)
Description
During the long shutdown of the LHC in 2018/19 (LS2) the present Inner Tracking System (ITS) of the ALICE experiment based on silicon pixel,
silicon drift and silicon strip detectors, will be entirely replaced by a
new tracker using novel monolithic silicon pixel chips.
This new tracker will significantly enhance heavy flavor measurements, which
are out of reach for the present system,
e.g.
charmed
baryons,
such
as
the
ΛC,
and
will
allow
studying
hadrons
containing
a
beauty
quark.
The
new
tracker
will
provide
an
improved
pointing
resolution
in
r-‐
φ and
z,
decreasing
the
present
values
by
a
factor
3
and
5,
respectively,
to
about
40
microns
for
a
pT
of
500
MeV/c.
Each
of
the
seven
layers
will
be
constructed
using
50
micron
thin
silicon
chips
on
a
very
light
weight
carbon
fiber
based
support
structure,
allowing
to
achieve
a
very
low
material
budget
for
the
first
three
layers
of
0.3%
X0/layer
and
0.8%
X0/layer
for
the
four
outer
layers.
The
innermost
layer
will
be
placed
at
23
mm
radius,
compared
to
presently
39
mm.
Furthermore,
the
readout
rate
of
the
new
ITS
will
increase
from
presently
1kHz
to
50
kHz
for
Pb-‐Pb
collisions
and
400
kHz
for
p-‐p
collisions,
thus
matching
the
expected
event
rate
for
Pb-‐Pb
collisions
after
LS2.
This
presentation
will
provide
an
overview
of
the
upgrade
of
the
ALICE
ITS
and
the
expected
performance
improvement.
It
will
present
the
actual
status
of
the
R&D
and
give
an
outlook
on
the
construction
phase
starting
in
2016.
| On behalf of collaboration: | ALICE |
|---|
Primary author
Petra Riedler
(CERN)
