1. 1/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 BE/ABP-SU/ Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders EDMS Document No 1171946

2. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ Introduction A priori data Fiducialisation Measurement devices Alignment procedures Supporting plate and shims Supporting plate equipped by screws Measurements results Conclusions Contents 2/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011

3. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ The CLIC mock up, under assembly in the building 169, is at the moment composed by the supporting system of 2 modules Type 0 and recently by 4 Drive Beam Quads. Introduction 3/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 The goal of the measurements and adjustments performed early November was to align the 4 DBQ: 2 DBQ with respect to 1 girder axis. Alignments were done according to the 2 methods proposed by Nick Gazis (either by wedging, or by using screws)

4. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ A priori data Fiducialisation 4/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 Fiducialisation of Boostec girder in CMM Olivetti (accuracy MPE about  6 µm)  Fiducials on cradles not used during DBQ alignment because of a temperature about 23°C Fiducialisation of the 4 DBQ (and associated BPM) in the CMM Leitz Infinity (accuracy MPE under 1 µm)  Use of 4 fiducials during alignment All components are mock-ups  fiducialisation of the beam pipe

5. Fiducials  CCR 1.5’’ holders glued on girders and DBQ CCR 1.5’’  error of sphericity and centering less than 0.0001’’ (about 2.5 µm) Laser tracker Leica AT401  accuracy about 7 to 10 µm rms in that kind of measurement volume Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ A priori data Measurement devices 5/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011

6. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ Alignment procedures Supporting plate and shims 6/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 Vertical adjustment by 3 shims make DBQ unstable  Using of 4 shims (not isostatic) Lateral gap between plate and girder doesn’t allow alignment  disassembling of DBQ / plate, adjusting, assembling Fixing the supporting plate to the girder by using screws creates lateral misalignment  Dynamic following of the fiducials during screwing WARNING: Even after tightening, the DBQ can move if it is hit Lateral adjustment by using a mallet  Surprisingly not so bad!

7. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ 3 rd adjustment screw inaccessible  Vertical wedging All lateral threads were out of range  Manually repairing in place Alignment procedures Supporting plate equipped by screws 7/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 Mechanical part blocks the supporting plate  Longitudinal displacing Lateral screws generate stress and misalignment  Return to first adjustment method

8. 3079 3069 Y X Z Y X Z Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ Measurements results 8/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011 Girder 3069, 1DBQ and 2DBQ nameX (mm) Y (mm)Z (mm) Girder axis 3069_C10.000-0.001 3069_C20.0001999.9990.002 1DBQ Axis 1DBQ-C10.021668.6240.046 1DBQ-C20.014885.624-0.006 2DBQ Axis 2DBQ-C10.0031677.548-0.008 2DBQ-C2-0.0201894.548-0.015 Girder 3079, 3DBQ and 4DBQ nameX (mm) Y (mm)Z (mm) Girder axis 3079_C10.000-0.001 3079_C20.0001999.9990.000 3DBQ Axis 3DBQ-C1-0.017675.4620.017 3DBQ-C2-0.006892.462-0.017 4DBQ Axis 4DBQ-C10.0191679.6000.034 4DBQ-C20.0171896.6000.023 Final position of the DBQ beam pipe axis in the girder reference frame

9. Adjustment of 4 Drive Beam Quads positions on TM0 CLIC girders BE/ABP-SU/ Conclusions It’s a pity to accurately machine a supporting plate and to need to repair threads, to adjust lateral position (link DBQ / plate), etc. Total alignment lasted about 4.5 days  Now we could perform it again within 2 days. Alignment tolerance of 20 µm is not respected for all DBQ. We are limited by adjustment systems and not by measurement device. If a new adjustment system is designed, we would like to take part to the mechanical design and we will be happy to try again to align DBQ. 9/9 Hélène Mainaud Durand Sylvain GRIFFET, 28/11/2011