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March 14, 2002 GJG
NCSX CRYOGENICS DESIGN DEVELOPMENT STATUS
WBS-63
March 14, 2002 GJG
PURPOSE OF STATUS REVIEW
• Review serves as a design intent checkpoint
• These concepts will serve as the basis for the upcoming cost and schedule exercise
• Known requirements for technical design will be presented
• Approximate schedule for estimate will be discussed
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
PBX-M (ORNL) beamline’s dewar hookup:
1. LN2 & LHe Transfer Lines
2. Control Valves & Misc. Elements
11.
2.
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
PPPL care taking staff has carefully removed and stored the transfer lines, valves, etc.
Upcoming effort will remove and retain:
1. Twin bayonet heads
2. LN2 -traced LHe rigid lines
1.2.
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
The 9,000 gallon LN2 tank is in service and will soon support the Hall Thruster Project at less than 200 gallons per day
The NCSX heat load (updated 3/13/02) is about 6,000 gallons (one trailer) per plasma day
This tank is fine!
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
Helium Dewar Shed:
The PBX-M implementation of the ORNL beams featured a once-through, then vent to atmosphere LHe system. NCSX should use the same approach.
A 1000 gallon portable dewar is forked from the vendor’s trailer and moved through the overhead door.
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
The shed is past due for corrosion control and paint.
The dewar scale (mandatory for ops) requires rehab or replacement
Dewar Scale Assembly
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
The LHe spear, hose, and phase separator are in serviceable condition. Some new seals and start-up labor will be required.
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
This is an example of LN2-traced LHe cryo line and is very similar to the lines in the PBX-M area.
March 14, 2002 GJG
NCSX SITE EQUIPMENT STATUS
Unfortunate conflict:The service entrance
and main “tee”for the LN2 -traced LHe rigid lines rests on the soon-to-be-dismantled north shield wall
March 14, 2002 GJG
SIMPLIFIED LIQUID CRYOGEN DISTRIBUTION
N.C. Alarm Response Valve
LN2 Dewar
Skid Mount LHe Dewar
Cry
osta
t & F
ield
Coi
l
Bea
mli
ne #
1
Bea
mli
ne #
2
Bea
mli
ne #
3
Bea
mli
ne #
4
Vent to High Bay
Vent to Stack
March 14, 2002 GJG
SIMPLIFIED LN2 FIELD COIL COOLING SUPPLY
Hermetic Suction/Expansion
Tank
Fie
ld C
oil F
low
Pat
hs
45 @
15
lpm
P
P
FIELD COIL HEAT EXCHANGER
CLOSED, PRESSURIZED PRIMARY
OPEN, BOILING SECONDARY
PX
PX
TX
TX.36 MPa
(52 psia)
For 90 K
Ops
P LN2 MAKEUP
March 14, 2002 GJG
SIMPLIFIED GN2 CRYOSTAT COOLING SUPPLY
NCSX
PXTXPX
FIELD COIL HEAT EXCHANGER
CLOSED, PRESSURIZED PRIMARY
OPEN, BOILING SECONDARY PIT
OT
/ST
AT
IC A
SS
’Y
SU
PP
LY
TE
MP
DIF
F P
RE
SS
TO
AT
M
OU
TS
IDE
BU
ILD
ING
RESISTIVE
HEATER
PX
PIT
OT
/ST
AT
IC A
SS
’Y
M
M
LN2 SUPPLY
OUTDOOR VENT (SAFETY) STACK
RESISTIVE
HEATER
March 14, 2002 GJG
WBS-63 REQUIREMENTS
• Vent effluent gases without personnel injury
• Survive worst probable indoor liquid spill without personnel injury
• Deliver about 6000 LN2 gal/day to cryostat, field coil cooling, and beam pumps
• Deliver about 200 liters/day LHe to beam pumps for PBX-M-style beam ops
March 14, 2002 GJG
WBS-63 REQUIREMENTS, CONTINUED
• Remove 6E7 kJ/pulse from field coils at ABOUT a flow rate of 15 l/s and pressure drop of 1.4 MPa to support a 15 minute machine cycle.
• Circulate warming and cooling GN2 around machine at *** kg/sec (pressure drop?) to support a thermal cycle of time of *** hours (days?)
March 14, 2002 GJG
INTERFACE CONTROL - WHO HAS THE WBS BALL? WHO PAYS?
• Oxygen Level Monitors – Multiple Locations
• N2/Air Exchange Emergency Blower– Changes Air in TC VERY Quickly
– Needs Review, Maybe Not Necessary (NC valve?)
• Magnet Coolant Flow Monitoring• Magnet Flow Balancing Valves/Plumbing• Cryostat High/Low Pressure Monitor and Control
Algorithms• High Current 480 VAC circuits