Cryomech PT415, Installation, Operation And Routine Maintenance Manual

Page: 5 / 93

Sec
1.1
1
ction 1
This sectio
provides a
used and e
Helium R
.1.1 Gene
The Cryom
helium dew
establishin
helium or b
A 4 K puls
the helium
based on a
componen
heat from
or more a
refrigerant
Flexible st
compresso
The compr
pure low-p
removed v
series of o
via the hig
In the cold
cooling to
compresso
The Pulse
referred to
returning f
O-ring fitti
with the C
This redu
condensin
The Liquid
bottom of
must be h
Other com
monitor, e
relief valve
: Overv
on provides a
an overview o
expansion of
Reliquefi
eral descrip
mech Helium
war/cryostats
ng a closed H
be utilized to
se tube cryor
m inside the r
a closed-loop
nts: one is the
the system; t
additional exp
gas used i
tainless steel
or package to
ressor packag
pressure heliu
via a heat exc
oil separators
h-pressure he
d head, adia
o cryogenic
or package vi
e Tube Cold
o as the Re-li
from the cryo
ng on the Re
Cold Head, its
uces its tem
ng chamber; u
d helium is f
f the condens
handled with
mponents of
lectrical feedt
e and a vacuu
view
an overview
f this manual
acronyms us
er
ption
Re-liquefier is
, and then ret
elium loop. It
liquefy helium
refrigerator s
re-liquefier. T
p helium expa
e compressor
the other is th
pansion cycle
in the Cryom
lines called
o the cold hea
ge works as f
um that is retu
changer, and
s and filters. T
elium flex line
abatic expans
temperatures
a the low-pre
Head is mo
iquefier Main
ostat dewar e
e-liquefier Ma
s heat is abs
perature, inc
until it contact
funneled into
sing chambe
h care.
the Helium
through, silico
um port.
1-1
discussion of
, including the
ed in the man
s designed to
turn the Liquid
t can be insta
m gas from ga
upplies the c
The operation
nsion cycle. A
package, wh
he cold head,
es to cool it
mech cryoge
helium flex l
ad and carry lo
follows. An oi
urned from th
the oil from th
The compres
e.
sion of the h
s. The low-
essure helium
ounted in a v
Assembly. T
enters into the
ain Assembly.
sorbed into th
creasing its
ts the 4K con
the Liquid h
r to the cryo
Re-liquefier
on diode, and
f Cryomech H
e organizatio
nual.
o recondense
d Helium to th
alled into cryo
as cylinder to
cryorefrigerati
n of a cryoge
A complete sy
ich compress
which takes
down to cry
nic systems
ines carry co
ow-pressure
il-lubricated c
e cold head.
he compress
sed helium is
helium and fu
-pressure he
flex line.
vacuum insul
The room tem
e condensing
. As the war
he heat exch
density, dro
densing surfa
helium Return
ostat. The re
are a pressu
d heater asse
Helium Reliq
n, basic defin
the boil off fro
he dewar/cryo
ostats already
fill a dewar.
ion necessar
enic refrigera
ystem consis
ses refrigeran
the refrigera
yogenic temp
is 99.999%
ompressed he
helium back.
compressor co
The heat of c
ion process is
s then fed to
urther heat r
elium then r
ated conden
mperature hel
g chamber th
rm helium com
angers on th
opping it low
ace, where it
n Line which
eturn line is
ure controlle
embly as well
Overview
uefiers. It als
nitions of term
om liquid
ostat
y full of liquid
ry to condens
ation system
ts of two majo
nt and remove
nt through on
peratures. Th
% pure helium
elium from th
ompresses th
compression
s removed in
the cold hea
removal allow
returns to th
sing chambe
lium gas/vapo
rough the 1/4
mes in conta
he Pulse Tube
wer inside th
condenses.
h connects th
s delicate an
r, temperatur
as a pressur
w
so
ms
se
is
or
es
ne
he
m.
he
he
is
a
ad
ws
he
er,
or
4"
ct
e.
he
he
nd
re
re