Measurement report of Boostec girders Control after receipt Sylvain GRIFFET, 13/12/2010 Measurements performed on the 1 st and 2 nd of December 2010 with the Laser Tracker LTD500 EDMS n° /12

Plan INTRODUCTION Tolerances to be checked Coordinates system Flatness and coaxiality 3079 girder 3069 girder Positioning 3079 girder 3069 girder Perpendicularity CONCLUSION Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 2/12

INTRODUCTION The objective of the measurements is to perform the dimensional control of the 2 Boostec girders after receipt at CERN (building 162). We measured these girders according to Nicolas Chritin plans and tolerances (EDMS n° ) using the Laser Tracker Leica LTD500. Measurement conditions were correct: temperature stability of 17.3°C to 17.8°C the 1 st of December and of 17.1°C to 17.5°C the 2 nd of December but lack of space. We will present measurement results with an accuracy of about 10 µm rms for the flatness and coaxiality and of about 20 µm rms for the positioning. We have not fully measured again Boostec girders but only checked the important points. The objectives were to check that girders were not damaged during transport and the machining of the side plans was consistent with the measurement report provided by Boostec (EDMS No ). Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 3/12

Tolerances to be checked Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 Reference A Reference D Reference E Reference C Reference B Reference F (Idem B) Reference G Reference H Reference I Reference A REFERENCE A POSITIONING 319 mm PERPENDICU LARITY POSITIONING 529 mm Reference D POSITIONING 210 mm PERPENDICU LARITY Reference E REFERENCE E POSITIONING 1946 mm* PARALLELIS M PERPENDICU LARITY Reference C REFERENCE C PERPENDICU LARITY Reference B MEDIAN PLAN mm POSITIONING 65 mm Reference F (idem B) MEDIAN PLAN mm POSITIONING 65 mm Reference G AXIS POSITIONING 65 mm POSITIONING 65 mm PLANEITY OR COAXIALITY YES General tolerances of ± 0.01 mm, *Tolerances of ± 0.1 mm 4/12

Tolerances to be checked Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 5/12

Tolerances to be checked Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 6/12

Coordinates system The coordinates system is the same that the one defined on site (EDMS n° ): _ Y axis = mean cylinders axis corrected by the offset generate by the cylinder diameter _ Z axis = perpendicular to the mean plane A _ System origin O = intersection of Y with the mean plane C Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 7/12

Flatness and coaxiality 3079 girder _ Planes flatness : A : 18 µm rms E : 9 µm rms C : 4 µm rms Bg : 2 µm rms Bd : 6 µm rms Fg : 6 µm rms Fd : 4 µm rms _ Axis coaxiality for the cylinder locations : 15 µm rms. Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 8/ girder _ Planes flatness : A : 9 µm rms E : 7 µm rms C : 5 µm rms Bg : 3 µm rms Bd : 7 µm rms Fg : 8 µm rms Fd : 3 µm rms _ Axis coaxiality for the cylinder locations : 8 µm rms. For the two Boostec girders, and with the consent of Nick Gazis, the planes D, H and I were not measured again.

Positioning 3079 girder _ Positioning of C with respect to E (along Y), distance between mean planes : mm or 73 µm of offset with respect to the nominal length. _ Positioning of A with respect to Y axis (along Z): distance from the mean plane A to the Y axis of mm or an offset of 65 µm (instead of 28µm on site). It will be necessary to measure this offset by CMM, the use of shims is possible. Measurement report of Boostec girders Sylvain GRIFFET, 13/12/2010 9/12 _ Positioning of Bg with respect to the median plane: mm instead of -65 mm Positioning of Bd with respect to the median plane: mm pour 65 mm Positioning of Fg with respect to the median plane: instead of -65 mm Positioning of Fd with respect to the median plane: mm instead of 65 mm The Bd and Fd planes have been enough machined to allow the use of shims.

Positioning 3069 girder _ Positioning of C with respect to E (along Y), distance between mean planes : mm or 63 µm of offset with respect to the nominal length. _ Positioning of A with respect to Y axis (along Z): distance from the mean plane A to the Y axis of mm, or an offset of 49 µm (instead of 8µm on site). It will be necessary to measure this offset, if any, by CMM, the use of shims is possible. Measurement report of Boostec girders Sylvain GRIFFET, 13/12/ /12 _ Positioning of Bg with respect to the median plane: mm instead of -65 mm Positioning of Bd with respect to the median plane: mm instead of 65 mm Positioning of Fg with respect to the median plane: mm instead of -65 mm Positioning of Fd with respect to the median plane: mm instead of 65 mm The Bg plane seems not to have been machined enough of the order of 60µm, the CMM measurements by Boostec confirm that (EDMSn° ).

Perpendicularity Measurement report of Boostec girders Sylvain GRIFFET, 13/12/ and 3069 girders For the two girders, and like on site, we have not detected any problem about perpendicularity between planes. 11/12

CONCLUSION According to the results presented here and the accuracy of LTD500, we can confirm the measurements taken on site the 28th of October 2010 (EDMS No ) for the tolerances concerning : Perpendicularities between planes, Flatness of measured planes, And the coaxiality of cylinders put on the V-supports. For the positioning, we find offsets, for the two girders, of the order of 50µm between the bottom plane A and the beam axis. It will be necessary to check that with CMM measurements because these faults are above values detected on site, however it is possible to use shims. The machining of the side planes seems to be enough to allow the use of shims, except for the Bg plan of the 3069 girder which is above about 50 µm (that is confirmed by CMM measurements of Boostec). More accurate measurements with CERN CMM will be necessary to define shims for the side planes. The Boostec girders have apparently not been damaged during transport. Measurement report of Boostec girders 12/12 Sylvain GRIFFET, 13/12/2010