MQXF CERN Update

E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F.O Pincot, X. Sarasola

13-01-2015

2E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Outline

Coil Name Description Status

MQXF-001 First Practice (Cu) Post Impregnation

MQXF-101 Second Practice (Nb3Sn – Low grade) Measurements post-impregnation

MQXF-102 First Coil (Nb3Sn) Impregnation

MQXF-103 Nb3Sn Heat treatment

1. Status

2. Traces for LARP3. Pole gaps

E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 001Post impregnation operations ongoing.

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A new tool for the impregnation of the ends (inner layer) has been machined.

Impregnation of the end spacers on inner layer is foreseen for the next days.

Update from last presentation

4E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 101Measurements with faro arm ongoing• Measurements made on a granite bench• Coil supported on two points

Method and tools are under development.

5E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 102Coil ready for impregnation

6E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 102Pre-tinning of Nb3Sn cables (update from last presentation):

Problem during pre-tinning of Nb3Sn cable on outer layer: 4 strands broke. It happened during cool down, when the operators were dismounting the mould.

7E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 102Pre-tinning of Nb3Sn cables:

Solution: 3 strands of NbTi have been added before the splicing

8E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 102Pre-tinning of Nb3Sn cables:

Dimensions of the damaged area, before cutting the cable

NOTE: dimensions in mm, evaluated for proportion with respect to the cable width

9E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 102Pre-tinning of Nb3Sn cables:

Dimensions of the damaged area, after cut of the cable and repair

NOTE: dimensions in mm, evaluated for proportion with respect to the cable width

E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Coil 103Coil ready for heat treatment

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E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Traces for LARPN°2 sets of traces have been manufactured for LARPElectrical checks still to be done

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E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Pole gaps

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Initial pole gap set for each coil

• Coil 001 Cu: 3 mm

• Coil 101 Nb3Sn lowgrade: 7.5 mm

• Coil 102 Nb3Sn: 5 mm

• Coil 103: 4.5 mm

13E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Pole gapsCheck of pole gap during fabrication

* gap after heat treatment evaluated by sight (no possibility to measure it): however the gap is almost closed.** for coil 102, winding mandrel dismounted on Friday, and pole gap measured on Monday.

Initial GAP (set before winding) [mm]

GAP just after curing and release tension [mm]

GAP before heat treatment [mm]

GAP after heat treatment [mm]

Coil 000 (Cu) 3 2.7 0.1

Coil 101 (Nb3Sn low grade) 7.5 6 5.6

Coil 102 (Nb3Sn) 5 4.1 3.8 3.37

Coil 103 (Nb3Sn) 4.5 3.4 3.11

E. Cavanna, N. Bourcey, P. Ferracin, S. Izquierdo Bermudez, J. Mazet, J. C. Perez, F-O. Pincot X. Sarasola

Pole gaps

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Some considerations

Total contraction coil 101: 7.5-5.6= 1.9 mm (0.4 mm during reaction)

Total contraction coil 102: 5-3.37= 1.63 mm (0.43 during reaction)

Contraction coil 103 before reaction: 1.4 mm

If coil 103 will contract of 0.4 mm during reaction, the gap contraction will be 4.5-(3.1-0.4)=1.8 mm