. These are manual valves and must be accessed at the U tubes. Hall A has control of both of these valves.

gapingthingsUrban and Civil

Nov 15, 2013 (3 years and 11 months ago)

78 views

**** When moving a magnet to warm return, open the warm return valve all the way and then slowly
close the cold return valve,
the procedure is reversed when moving a magnet to cold return. ALWAYS
coordinate these procedures with the Cryogenics group.

Q1

The warm
(CEV71/2Q106)
and cold (
CEV71/2Q105
) return valves are controlled by automatic valves
(cryo). Both valves are unplugged to prevent unwanted movement due to radiation damage. The 05
and 06 valves are located on the magnet cryostats, they should b
e the only valves unplugged. The warm
return val
v
e

(06)

is located almost directly behind the
target;

it sits almost directly above the
spectrometer entrance windows and outboard a little. The plug for this valve should be lying on the
magnet cryostat be
low the outlet (you can follow it back). The cold return valve

(05)

is located on the
beam line side of the
cryostat;

the plug should be lying below the outlet. Plug in these valves, and verify
movement while cryo
opens/closes the valves, unplug the valv
es when they are finished.


Q2

The Q2 warm/cold return
valves
are located on the platform below the detector huts
just above the Q2
magnets
.
They are accessed through the floor and are clearly marked.
The valve han
d
le is stored behind
the fire extinguishe
r.
Hall A controls both of these valves.


Q3

The Q3 warm/cold return are located on the platform in front of the detector hut doors, lift the lid on
the raised blue box to gain access the valves. The valves should be labeled, if not, the warm return valv
e
has a copper tube attached to it that runs down to the magnet cryostat
.
These are manual valves and
must be accessed at the U tubes.

Hall A has control of both of these valves.


D1


The cold return valve is an automatic valve located on the
magnet‘s

cryostat

(CEV71/2D105)
. The valve
is unplugged to prevent unwanted movement due to radiation damage. It should be the only valve
unplugged. Plug the valve in and coordinate with cryo. The dipole warm return valve is a ball valve
located on the outboard

side of the
magnet‘s

cryostat, about 3 feet above the surface of the magnet.
The valve will be labeled D1 warm return. You may need a heat gun to remove ice before valve
manipulation is possible.

The cold return valve is controlled by cryo, and we cont
rol the warm return
valve, so change over usually has to
accomplished

while on

the phone with a cryo tech.