R3B
ASIC
User
Manual
1
Overview
R3B
(Reaction
studies
with
Relativistic
Radioactive
Beams)
is
a
fixed-target
detector
system
with
high
efficiency,
acceptance,
and
resolution
for
kinematically
complete
measurements
of
reactions
with
high-energy
radioactive
beams.
It
will
be
located
at
the
focal
plane
of
the
high-energy
branch
of
the
Super-FRS
(Fragment
Separator),
which
is
a
magnetic
spectrometer.
This
experiment
forms
part
of
NUSTAR
(Nuclear
Structure
Astrophysics
and
Reactions)
and
will
be
installed
at
FAIR
(Facility
for
Antiproton
and
Ion
Research)
in
Germany.
Detectors
will
track
and
identify
a
radioactive
beam
onto
and
out
from
a
reaction
target,
Light
charged
particles
and
gamma
rays
from
the
target
region
will
be
measured
by
the
target
recoil
detector.
This
detector
surrounds
the
target
volume
and
consists
of
two
main
elements:
the
Si
tracker
and
the
calorimeter.
The
Si
tracker
is
a
three-layer
silicon
micro-vertex
tracker,
providing
precise
tracking
and
vertex
determination
as
well
as
energy
and
multiplicity
measurement.
The
R3B
ASIC
is
intended
for
reading
out,
processing
and
digitising
signals
generated
by
ionising
particles
passing
through
the
silicon
strip
detector.
These
signals
are
comprised
of
either
electrons
or
holes
depending
on
the
polarity
of
the
detector.
A
block
diagram
of
the
ASIC
is
shown
in
figure
1.
I
2
C
Interface
Control
Registers
128
Channels
Analogue
Multiplexer
12
bit
ADC
Data
Buffer
Signal
Preamplifier
Shaper
Peak
Hold
Calibration
Mask
Gain
Amplifier
Comparator
Channel
Control
Logic
Chip
Control
Logic
Gain
Amplifier
Comparator
Time
Stamp
Counter
128
bit
OR
Trigger
Calibration
Calibration
Controls
Voltage
Level
Energy
Threshold
Time
Stamp
Threshold
Time
Stamp
Clock
Figure
1
:
Block
Diagram
of
the
R3B
ASIC
2
|