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