MQXFA coil dimensions and dispositions P Ferracin Dan

MQXFA coil dimensions and dispositions P. Ferracin, Dan Cheng, Heng Pan, Soren Prestemon, Katherine Ray on behalf of the MQXF collaboration logo area AUP-CERN video-meeting coil WG May 13 th, 2020 LBNL, Berkeley, CA, USA

Updated drawing Paolo Ferracin 2

Inner radius profile tolerance and disposition • Current disposition • • The inner radius profile deviations shall be within +0. 150/-0. 250 mm if measured dimensions are out of tolerance • • • Proposed new disposition • • The C-E and D-F inner radius profile deviations shall be within +0. 150/-0. 250 mm if measured dimensions are out of tolerance • • Open a Discrepancy Report Discuss disposition with L 2 and L 3 The E-F inner radius profile deviations shall be within +0. 000/-0. 250 mm if measured dimensions are out of tolerance • • • Open a Discrepancy Report Discuss disposition with L 2 and L 3 Question • How do we account for possible delamination of the layer of impregnated fiber on top of the pole? Paolo Ferracin 3

Measurement of bumper area Paolo Ferracin 4

Measurement of bumper area • Proposed changes • Shift measured cross-sections close to all possible bumper locations • Add a measurement of a “circle” around the pole holes where bumpers are inserted • Project the data of the circle on the closest measured crosssection Paolo Ferracin 5

Bumper design and check • To be done • update bumper drawing +0/-0. 100 mm • Measure bumper before installation (as part of QC) • Fabricate a “gauge” to check that every bumper after installation does not exceed +1. 2 mm over the inner coil profile Paolo Ferracin 6