<s>
In	O
particle	B-Algorithm
detectors	I-Algorithm
a	O
detection	B-Algorithm
of	I-Algorithm
internally	I-Algorithm
reflected	I-Algorithm
Cherenkov	I-Algorithm
light	I-Algorithm
(	O
DIRC	B-Algorithm
)	O
detector	O
measures	O
the	O
velocity	O
of	O
charged	O
particles	O
and	O
is	O
used	O
for	O
particle	O
identification	O
.	O
</s>
<s>
It	O
is	O
a	O
design	O
of	O
a	O
ring	B-Algorithm
imaging	I-Algorithm
Cherenkov	I-Algorithm
detector	I-Algorithm
where	O
Cherenkov	O
light	O
that	O
is	O
contained	O
by	O
total	O
internal	O
reflection	O
inside	O
the	O
solid	O
radiator	O
has	O
its	O
angular	O
information	O
preserved	O
until	O
it	O
reaches	O
the	O
light	O
sensors	O
at	O
the	O
detector	O
perimeter	O
.	O
</s>
<s>
A	O
DIRC	B-Algorithm
was	O
first	O
proposed	O
by	O
Blair	O
Ratcliff	O
as	O
a	O
tool	O
for	O
particle	O
identification	O
at	O
a	O
B-Factory	O
,	O
and	O
the	O
design	O
was	O
first	O
used	O
by	O
the	O
BaBar	O
collaboration	O
at	O
SLAC	O
.	O
</s>
<s>
Since	O
the	O
successful	O
operation	O
in	O
the	O
BaBar	O
experiment	O
next-generation	O
DIRC-type	O
detectors	O
have	O
been	O
designed	O
for	O
several	O
new	O
particle	O
physics	O
experiments	O
,	O
including	O
Belle-II	O
,	O
PANDA	O
,	O
and	O
GlueX	O
.	O
</s>
<s>
The	O
DIRC	B-Algorithm
differs	O
from	O
earlier	O
RICH	B-Algorithm
and	O
CRID	O
Cherenkov	O
light	O
detectors	O
in	O
that	O
the	O
quartz	O
bars	O
used	O
as	O
radiators	O
also	O
transmit	O
the	O
light	O
.	O
</s>
