MQXC Nb -Ti 120mm 120T/m 2m models

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MQXCNb-Ti 120mm 120T/m 2m models

G.A.Kirby

MQXC has been running for 4 to 5 years and has had many contributors to the design, construction ,testing

From CERN, CEA, US labs and industry

Glyn A Kirby, LARP CM18/HiLumi LHC Meeting May 2012


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Over view

• MQXC cross section reminder.• Aperture Zero assembly over view• Heat extraction features (that can be used on all Hilumi magnets)

• collared aperture Warm Field measurements• yokes magnet Warm Fields measurements.• Aperture Zero vertical test plan • Project plan for magnets Zero, One ,& Two• Teat Extraction Horizontal test plan.


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MQXC Magnet Cross Section

Collaring Keys

Yoke

Yoke key

Pressuer vessel shellTwo layer coil

Axial assembly Rod

Holes for heat exchangers

Magnetic shims

Main Collar Insert Collar

Quench heater

Bean screen

Yoke fixing pin

Bus bar, assembly, lifting, feathers.

Main Magnet Parameters

Gradient 118 T/mAperture 120 mmWorking point

80% SS

Current 12’850 A

Open shoe


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Heat extraction features

Collaring Model with open ground insulation The yellow open structure provides helium path from coils to the heat exchangers


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Thanks to Pier Paolo Granieri for cable images

Heat extraction features

Collars spacing give 6% open

Open collaring shoes

Open quench heater

We see the open helium paths through the “fish-bones’ and the open quench

heater between layers.


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MQXC project over view-Coil manufacture for 3 apertures completed.-99% of components delivered for all 3 magnets.(We are only missing the half shells , which have been replaced by 4 rods for vertical test)

-Magnet zero Warm field measurements very good result! Waiting for 1.9K test in SM18. (end May/ June). Cold test will start to measure heat extraction. (new expected heat load ~860 W @ 1.9K !)

-Magnet 1 Aperture assembly started. (cold test June /July)


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Pole assembly

Quench heater mounted on top of layer one coil

Soldering the inter layer joint

Fish-bone on top of layer 2


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Magnet assembly over view

Vertical assembly 9m magnet will need horizontal assembly

Large movements during compressing coil, insulation and collars 2 to 3 cm on dia.

Full length collaring keys


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End flange and joint box

End flanges welded to

collaring keys

Multi layer joint box


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4 – 80mm diameter rods temporary replacement for outer shell

Yoke packing factor too high at 99.6%

we need to reduce to 98% for the next

magnet .


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Aperture Warm Field Measurementswithout Yoke


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Yoked magnet Warm field measurement with large coil set.


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MQXC Magnetic shims. 8 rods in the collars, and 8 plates between collar’s and yoke.

We can adjust final field quality + or – several units

Magnetic shims can me mounted or removed easily


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Results from Warm Field measurements in yoked magnet zero

b3 a3 b4 a4 b5 a5 b6 a6 b7 a7 b8 a8 b9 a9 b10 a10 b11 a11 b12 a12 b13 a13 b14 a14 b15 a15

-1.0

-0.6

-0.2

0.2

0.6

1.0Integral Harmonics @ 27 mm

10A 15A 20A

Units

Magnetic measurements of the MQXC-1 show all together a very slightly improved field quality with respect to the collared coil. The mulitpole components at 27 mm reference radius are all below 1 unit in 10-4. The effect of the iron yoke on the allowed multipoles is slightly lower than expected (-0.1 instead of -0.48 units for the b6 and -0.005 instead of -0.02 for the b10). It will have to be seen if this is confirmed with the new and more appropriate search coil. The b6 component in the straight section is about 1 unit higher than expected, but in the right direction. The b6 could be further reduced by installing all the tuning rods. This would be useful also for the field quality at nominal excitation, because the saturation effect on the iron yoke is only of the order of 0.4 units.

Thanks to Prof. Stephan Russenschuck and his team


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Vertical 1.9 K test plan. • protection test set up dump, QH testing "• training to high field• magnetic field measurement • joint resistance check• beam heating tests, with inter-pole heaters and QH • measurement of Ramp rate loss • thermal cycle to room temp• Change magnetic shims ?• cool to 1.9K • Repeat high field training and field measurement


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MQXC (0,1,&2 Magnet Planning ) for 2012 plan

Magnet Assy “0”SM 18 Cold testing

Magnet “0”

Assy Magnet “1”

JuneEaster August

Assy Magnet “2”

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Heat Extraction Cold Horizontal Testing

• We plan to use a std. MQ cryostat• The horizontal test is to see if we can

extract the equivalent large heat load (860W over the triplet) (see Rob’s talk later )

• Heaters on the cold bore and in the magnet simulate the beam beating ~ 20W on the 2m magnet

2M- MQXCSM18 Test stand

MQ vacuum vessel

Valve box to feed two heat exchanger tubes

through magnet



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We are Pushing on with MQXC hope to finish vertical testing this year

The End

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MQXC Nb -Ti 120mm 120T/m 2m models