TD18 – post mortem analysis Inspection 11WDSDVG1KEK SLAC

TD18 - analysis RF check made at CERN (confirmation of previous results from SLAC, EDMS: ) Straightness measurement Cutting: see next slides Visual inspection (EDMS: ) SEM (localization of breakdowns) Dimensional control (EDMS: ) 2

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11 For the straightness measurement we have cut 2 couplers

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13 The engraved lign is not to be lost in the orientation of the discs after the cuts

G. Riddone, Preparation for the measurement of straightness for the cells after bonding and of the couplers after brazing Mesures 1 Mesures 2 Alignment of cells 0 and 20 is 0 in the vertical and horizontal axis

15 DISQUESMICRONS COUPLEUR0 D.00 D.10 D.2-9 D.3-5 D.43 D.53 D.64 D.7-19 D.8-18 D.9-16 D D D.12-8 D.13-5 D.14-3 D.153 D.162 D D D.19-9 D.200 COUPLEUR10 mesures1 Results after 4 passes with a micron comparator

16 DISQUESMICRONS COUPLEUR2 D.00 D.1 D.2-4 D.32 D.46 D.51 D.6-6 D.7-15 D.80 D.9-10 D.10-3 D D D.13-6 D.14-9 D.15-7 D D.170 D.18-2 D D.200 COUPLEUR12 Results after 4 passes with a micron comparator at 90 degrees of the first measurement

17 Mesures1: 23 microns for the disc bonding from 0 to microns with the coupler brazing Mesures 2 : 21 microns for the disc bonding from 0 to microns with the coupler brazing Superposition of the values of two measurements

18 Cutting sections for analyses

19 5 cuts: Iris shall be not damaged 16,17,18,19 and 20 STEP 1 Cut 5 Cut 1 Part A Part B Part C Part D Part E the irises should not be damaged Les disques seront gravés A,B,C,D et E

G. Riddone, STEP 2.1 Cut 6 Coupe disque 10

21 STEP 2.2 Cut 7 Part F Part G Longitudinal section of the discs 11 to 15

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29 Dimensional control disk N 18 (EDMS: ) Diameter of the iris is mm before BONDING

30 Dimensional control (EDMS: ) Diameter after BONDING is mm difference is 0.6 microns Diameter of the iris is mm before BONDING

31 SEM (localization of breakdowns) by Markus