LARP LQX and MQX MagnetsCryogenic Testing at Fermilab’s Industrial

Building 1

Roger RabehlTechnical Division/Test & Instrumentation

Department

Present Cryogenic Capabilities• Horizontal test stand providing 1.9 K

subcooled liquid bath.

Present Cryogenic Capabilities

• Feed Box with a Two-Bath System– Saturated 4.5 K liquid for

vapor-cooled power leads

– Subcooled 1.9 K liquid for magnet testing

– Separated by a lambda plate

Present Cryogenic Capabilities

• Feed Box Connections– Heat exchanger (for present LHC IR

quadrupoles, inner line is pumped 1.9 K two-phase and annular area is subcooled 1.9 K liquid)

– Magnet He supply (two for instrumentation, one for power bus, one capped)

– Beam pipe for warm bore/magnetic measurements

– Cool-down return– Thermal shield LN2 supply and

return

Present Cryogenic Capabilities

• Return End Connections– Heat exchanger

pipe termination and a liquid collection pot.

– Cool-down return.

Present Cryogenic Capabilities

• Subatmospheric operations– Two Kinney pump skids located in

IB1 (KMBD 3203 blower/KLRC 950 liquid ring pump; KMBD 2002 blower, KLRC 525 liquid ring pump) provide combined capacity of 5 g/s at 15 Torr (assuming 2 Torr pressure drop from 17 Torr/1.9 K).

– Dedicated to the LHC quadrupole horizontal test stand.

– The same pumps used to test the present LHC IR quadrupoles.

Present Cryogenic Capabilities

• Subatmospheric operations– Feed Box includes a

single-layer J-T heat exchanger to minimize flashing as 4.5 K saturated liquid is supplied to the 1.9 K heat exchanger

Present Cryogenic Capabilities

• 1.9 K heat exchanger for present LHC IR quads– Saturated 1.9 K liquid in

corrugated inner line, which also served as the pumping line on the test stand.

– Subcooled 1.9 K liquid in outer annular volume, connected to magnet volume through cross-over pipes in the cryostats.

D. Ramos Duarte, CERN (10/22/13)

Present Cryogenic Capabilities

• 1.9 K heat exchanger for LQX and MQX– Saturated 1.9 K liquid in

HX pipe placed in cold mass cooling hole(s).

– Pumping line is external to the cold mass.

– Connection between HX pipe and pumping line must be made in the cryostat.

D. Ramos Duarte, CERN (10/22/13)

H. Allain, R. van Weelderen, CERN (11/28/12)

Present Cryogenic Capabilities• With proper cryostat provisions (pumping line with cross-overs, cool-down

return, thermal shield), the cryogenic process of LQX and MQX testing will be similar to the testing of the present LHC IR quads.

Lead flowsTo compressor suction

GN2 vent

Pumps

LHe/GHesupply LN2 supply

Fill valvesJ-T HX

Cool-down/warm-up return

Reliefs, quenchrecovery

J-T valve

Return End Cryostated cold mass with external pumping line Interconnect Feed Box

1.9 K saturated liquid

1.9 K subcooled liquid

4.5 K saturated liquid

Present Cryogenic Capabilities• Cryogenic controls will use the standard IB1 process control

architecture– Industrial PLC for process control– Industrial HMI (iFix from GE-Fanuc) for operator displays, historical

data collection, and historical data trend plotting

Required Cryogenic Capability Upgrades

• Quench recovery system– Motivation is to recover helium

gas generated by high-energy magnet quenches rather than venting to atmosphere, as was done for previous LHC IR quadrupole testing.

– In 2012, a 4,000 ft3 helium gas tank was reconfigured to also operate as a quench tank.

– In service since June 2012 for VMTF, saving ~$1.2k of helium per quench.

– Need to extend existing piping and tie in to the test stand and to the quench header.

New

Existing

Stand 4

Required Cryogenic Capability Upgrades

• Controlled cool-down/warm-up– Present LHC IR quadrupoles

were tested with unrestricted cool-down and warm-up.

– Operational experience in providing controlled cool-down/warm-up of magnets in other test stands.

– Engineering assessment required to determine optimum implementation of automatic temperature control.

(Automatic)

(Manual)

Required Cryogenic Capability Upgrades

• Miscellaneous– Refurbishment of vacuum (pump-down and

insulating vacuum) systems– Re-sizing of relief devices and relief discharge

header– Valve and instrument upgrades