F. BORGNOLUTTI Oct. 16 th 2012 Winding Test plan for the MQXF Cable

Outline Mechanical stability of Rutherford Cable Winding Test Plan 16/10/2012F. Borgnolutti2

Mechanical stability of Rutherford Cable 16/10/2012F. Borgnolutti3 The mechanical stability of a cable reveals itself during a coil winding through what is called popped strand. In a coil popped strands can cause insulation damages and high stress points due to oversizing of the cable:  Ex: HQ coil 18, lot of popped strands in Layer 2 produces inter-turns shorts Some parameters that has an impact on a cable mechanical stability:  Strand diameter: a smaller diameter makes a cable more flexible  Compaction factor  Cable aspect ratio  Pitch length  Pole thickness  …… HQ cable, unfavorable winding direction

Mechanical stability of Rutherford Cable HQ01d/e 16/10/2012F. Borgnolutti4 Inner layer (favorable winding direction): All the quench occurred in the straight section Outer layer (unfavorable winding direction): All the quench occurred in the heads: popped strand effect?

Winding Test Plan Winding test performed around a pole piece obtained from a scale up of the HQ IL pole (should give us an idea about the mechanical stability of a cable):  Both favorable and unfavorable winding directions will be tested The pole piece will be ready in about one week (3D printing) (First cable expected by the end of October) In the mean-time a pole piece that is based on a real MQXF cross-section is being designed at Fermilab. 16/10/2012F. Borgnolutti5