<s>
AGATA	B-Algorithm
,	O
for	O
advanced	B-Algorithm
gamma	I-Algorithm
tracking	I-Algorithm
array	I-Algorithm
,	O
is	O
a	O
highly	O
segmented	O
High	O
Purity	O
Germanium	O
(	O
HPGe	O
)	O
detector	B-Application
array	O
.	O
</s>
<s>
AGATA	B-Algorithm
is	O
capable	O
of	O
high	O
counting	O
event	O
rates	O
and	O
can	O
be	O
coupled	O
with	O
ancillary	O
detectors	B-Application
,	O
such	O
as	O
magnetic	O
spectrometers	O
,	O
fast-timing	O
detectors	B-Application
charged	O
particles	O
or	O
neutron	O
detectors	B-Application
.	O
</s>
<s>
The	O
AGATA	B-Algorithm
detectors	B-Application
are	O
Ge-detectors	O
that	O
are	O
36-fold	O
segment	O
with	O
six-fold	O
azimuthal	O
and	O
six-fold	O
longitudinal	O
segmentation	O
.	O
</s>
<s>
The	O
detector	B-Application
is	O
10cm	O
long	O
and	O
is	O
circular	O
at	O
the	O
rear	O
side	O
with	O
a	O
diameter	O
of	O
8cm	O
and	O
hexagonal	O
at	O
the	O
front	O
face	O
.	O
</s>
<s>
The	O
segments	O
can	O
then	O
be	O
considered	O
as	O
separate	O
detectors	B-Application
.	O
</s>
<s>
Passivated	O
areas	O
:	O
1.0mm	O
at	O
the	O
back	O
of	O
the	O
detector	B-Application
,	O
0.6mm	O
around	O
the	O
coaxial	O
hole	O
.	O
</s>
<s>
By	O
exploiting	O
the	O
spatial	O
information	O
contained	O
in	O
the	O
detector	B-Application
signal	O
we	O
can	O
more	O
accurately	O
localize	O
the	O
γ-ray	O
interaction	O
than	O
is	O
possible	O
by	O
the	O
geometry	O
of	O
the	O
segments	O
.	O
</s>
<s>
A	O
photoelectron	O
or	O
Compton	O
electron	O
generates	O
electrons	O
and	O
holes	O
which	O
induce	O
image	O
charges	O
of	O
opposite	O
signs	O
on	O
the	O
detector	B-Application
electrodes	O
when	O
a	O
signal	O
is	O
produced	O
.	O
</s>
<s>
The	O
induced	O
charge	O
is	O
distributed	O
over	O
several	O
electrodes	O
for	O
the	O
large	O
distance	O
in	O
a	O
multi-segmented	O
detector	B-Application
.	O
</s>
<s>
To	O
identify	O
the	O
detector	B-Application
sector	O
where	O
the	O
interaction	O
took	O
place	O
we	O
have	O
to	O
observe	O
the	O
net	O
charge	O
on	O
the	O
charge-collecting	O
electrode	O
simply	O
observing	O
the	O
polarity	O
of	O
the	O
induced	O
signal	O
.	O
</s>
<s>
The	O
spatial	O
information	O
of	O
the	O
detector	B-Application
signals	O
are	O
known	O
from	O
digital	O
pulse-shape	O
analysis	O
.	O
</s>
<s>
The	O
pre-amplified	O
detector	B-Application
signal	O
is	O
digitized	O
with	O
14-bit	O
resolution	O
with	O
a	O
speed	O
of	O
100	O
Ms/s	O
.	O
</s>
<s>
Different	O
algorithms	O
have	O
been	O
developed	O
depending	O
on	O
the	O
different	O
detector	B-Application
information	O
.	O
</s>
<s>
The	O
Ge-detector	O
determines	O
the	O
pulse-shape	O
of	O
the	O
γ-ray	O
which	O
contains	O
the	O
information	O
about	O
the	O
three-dimensional	O
position	O
of	O
each	O
individual	O
interaction	O
within	O
the	O
detector	B-Application
with	O
the	O
released	O
energy	O
in	O
the	O
interactions	O
.	O
</s>
<s>
This	O
is	O
done	O
experimentally	O
using	O
tightly	O
collimated	O
γ-ray	O
sources	O
with	O
an	O
external	O
collimated	O
detector	B-Application
for	O
the	O
Compton	O
scattered	O
coincidence	O
.	O
</s>
<s>
The	O
conductivity	O
of	O
the	O
Ge-detector	O
influences	O
the	O
magnitude	O
of	O
the	O
drift	O
velocities	O
and	O
the	O
angle	O
between	O
the	O
electric	O
field	O
vector	O
and	O
the	O
drift	O
velocity	O
.	O
</s>
<s>
The	O
crystal	O
volume	O
is	O
divided	O
into	O
cubic	O
matrices	O
for	O
a	O
given	O
detector	B-Application
.	O
</s>
<s>
The	O
simulation	O
of	O
the	O
pulse	O
shape	O
for	O
the	O
any	O
arbitrary	O
detector	B-Application
is	O
shown	O
in	O
the	O
figure	O
8	O
.	O
</s>
<s>
For	O
a	O
given	O
detector	B-Application
,	O
the	O
crystal	O
volume	O
is	O
divided	O
into	O
a	O
cubic	O
matrix	O
of	O
lattice	O
sites	O
.	O
</s>
<s>
The	O
detector	B-Application
response	O
for	O
a	O
given	O
interaction	O
site	O
is	O
calculated	O
by	O
tracking	O
the	O
trajectory	O
of	O
the	O
charge	O
carriers	O
through	O
the	O
weighting	O
field	O
as	O
shown	O
in	O
figure	O
8	O
.	O
</s>
<s>
The	O
steps	O
which	O
should	O
follow	O
to	O
compute	O
the	O
pulse	O
shape	O
response	O
for	O
a	O
given	O
interaction	O
position	O
in	O
the	O
detector	B-Application
volume	O
are	O
:	O
</s>
<s>
Specify	O
the	O
detector	B-Application
geometry	O
.	O
</s>
<s>
AGATA	B-Algorithm
is	O
the	O
most	O
efficient	O
γ-ray	O
tracking	O
array	O
ever	O
developed	O
and	O
position	O
sensitive	O
Ge-detectors	O
are	O
the	O
main	O
concept	O
for	O
this	O
.	O
</s>
<s>
It	O
is	O
mentionable	O
that	O
the	O
Composite	O
Ge	O
detectors	B-Application
were	O
first	O
developed	O
for	O
the	O
EUROGAM	O
spectrometer	O
and	O
it	O
has	O
been	O
used	O
many	O
standard	O
applications	O
.	O
</s>
<s>
The	O
Encapsulated	O
Ge	O
detectors	B-Application
were	O
developed	O
for	O
the	O
EUROBALL	O
spectrometer	O
.	O
</s>
<s>
The	O
Segmented	O
techniques	O
are	O
the	O
latest	O
of	O
their	O
combination	O
and	O
are	O
used	O
in	O
AGATA	B-Algorithm
.	O
</s>
