<s>
MIRI	B-Library
,	O
or	O
the	O
Mid-Infrared	B-Library
Instrument	I-Library
,	O
is	O
an	O
instrument	O
on	O
the	O
James	O
Webb	O
Space	O
Telescope	O
.	O
</s>
<s>
MIRI	B-Library
is	O
a	O
camera	O
and	O
a	O
spectrograph	O
that	O
observes	O
mid	O
to	O
long	O
infrared	O
radiation	O
from	O
5	O
to	O
28	O
microns	O
.	O
</s>
<s>
Whereas	O
most	O
of	O
the	O
other	O
instruments	O
on	O
Webb	O
can	O
see	O
from	O
the	O
start	O
of	O
near	O
infrared	O
,	O
or	O
even	O
as	O
short	O
as	O
orange	O
visible	O
light	O
,	O
MIRI	B-Library
can	O
see	O
longer	O
wavelength	O
light	O
.	O
</s>
<s>
MIRI	B-Library
uses	O
silicon	O
arrays	O
doped	O
with	O
arsenic	O
to	O
make	O
observations	O
at	O
these	O
wavelengths	O
.	O
</s>
<s>
The	O
cooling	O
system	O
for	O
MIRI	B-Library
includes	O
a	O
Pulse	O
Tube	O
precooler	O
and	O
a	O
Joule-Thomson	O
Loop	O
heat	O
exchanger	O
.	O
</s>
<s>
This	O
allowed	O
MIRI	B-Library
to	O
be	O
cooled	O
down	O
to	O
a	O
temperature	O
of	O
7	O
kelvins	B-Operating_System
during	O
operations	O
in	O
space	O
.	O
</s>
<s>
MIRI	B-Library
was	O
built	O
by	O
the	O
MIRI	B-Library
Consortium	O
,	O
a	O
group	O
that	O
consists	O
of	O
scientists	O
and	O
engineers	O
from	O
10	O
different	O
European	O
countries	O
(	O
The	O
United	O
Kingdom	O
,	O
France	O
,	O
Belgium	O
,	O
the	O
Netherlands	O
,	O
Germany	O
,	O
Spain	O
,	O
Switzerland	O
,	O
Sweden	O
,	O
Denmark	O
and	O
Ireland	O
)	O
with	O
the	O
United	O
Kingdom	O
heading	O
the	O
European	O
consortium	O
,	O
as	O
well	O
as	O
a	O
team	O
from	O
the	O
Jet	O
Propulsion	O
Lab	O
in	O
California	O
,	O
and	O
scientists	O
from	O
several	O
U.S.	O
institutions	O
.	O
</s>
<s>
During	O
2013	O
and	O
finishing	O
in	O
January	O
2014	O
,	O
MIRI	B-Library
was	O
integrated	O
into	O
the	O
Integrated	O
Science	O
Instrument	O
Module	O
(	O
ISIM	O
)	O
.	O
</s>
<s>
MIRI	B-Library
successfully	O
passed	O
Cryo	O
Vac	O
1	O
and	O
Cryo	O
Vac	O
2	O
tests	O
as	O
part	O
of	O
ISIM	O
in	O
the	O
2010s	O
.	O
</s>
<s>
MIRI	B-Library
was	O
developed	O
by	O
an	O
international	O
consortium	O
.	O
</s>
<s>
MIRI	B-Library
is	O
attached	O
to	O
the	O
ISIM	O
by	O
a	O
carbon-fiber	O
and	O
plastic	O
hexapod	O
structure	O
,	O
which	O
attaches	O
it	O
to	O
the	O
spacecraft	O
but	O
also	O
helps	O
thermally	O
isolate	O
it	O
.	O
</s>
<s>
Most	O
of	O
MIRI	B-Library
is	O
located	O
in	O
the	O
main	O
ISIM	O
structure	O
,	O
however	O
the	O
cryocooler	O
is	O
in	O
region	O
3	O
of	O
ISIM	O
which	O
is	O
located	O
in	O
the	O
spacecraft	O
bus	O
.	O
</s>
<s>
The	O
imager	O
module	O
of	O
MIRI	B-Library
also	O
includes	O
the	O
Low	O
Resolution	O
Spectrometer	O
that	O
can	O
perform	O
long-slit	O
and	O
slitless	O
spectroscopy	O
from	O
5	O
to	O
12	O
μm	O
light	O
wavelength	O
.	O
</s>
<s>
To	O
allow	O
mid-infrared	O
observations	O
within	O
the	O
JWST	O
,	O
the	O
MIRI	B-Library
instrument	O
has	O
an	O
additional	O
cooling	O
system	O
.	O
</s>
<s>
In	O
this	O
case	O
the	O
JWST	O
cryocooler	O
resides	O
in	O
the	O
spacecraft	O
bus	O
and	O
it	O
has	O
lines	O
of	O
coolant	O
that	O
run	O
to	O
the	O
MIRI	B-Library
instrument	O
,	O
chilling	O
it	O
.	O
</s>
<s>
Its	O
target	O
is	O
to	O
cool	O
the	O
MIRI	B-Library
instrument	O
down	O
to	O
6	O
kelvins	B-Operating_System
( −	O
448.87	O
°F	O
,	O
or	O
−	O
267.15	O
°C	O
)	O
.	O
</s>
<s>
The	O
ISIM	O
is	O
at	O
about	O
40	O
K	O
(	O
due	O
to	O
the	O
sunshield	O
)	O
and	O
there	O
is	O
a	O
dedicated	O
MIRI	B-Library
radiation	O
shield	O
beyond	O
which	O
the	O
temperature	O
is	O
20	O
K	O
.	O
The	O
J-T	O
loop	O
is	O
a	O
Joule	O
–	O
Thomson	O
loop	O
heat	O
exchanger	O
.	O
</s>
<s>
MIRI	B-Library
has	O
10	O
filters	O
available	O
for	O
observations	O
.	O
</s>
