Status VELO alignment 1.NIKHEF 3D measurements 2.Photogrammetry 3.Calliper checks in x-direction 4.Photogrammetry again Jo van den Brand May 23, 2006

CenterFrame Reference points Above spindels Above IP

Detector Alignment Frame Reference points

VELO reference system IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd Same for the left side All in mm

NIKHEF 3D measurements of Center Frame Dimension x: – (design: 633.0) – Dimension y: – (design: 555.0) – – – Dimension z: – (design: ) – Conclusion: x and y within specs z: one point deviates

Photogrammetry

Note systematic x-offset for left and right halves More than 750  m deviation from NIKHEF 3D?! Fit to center frame design values Rms deviation: 257  m Data for y and z agree within accuracy of method (100  m)

Photogrammetry Note systematic x-offset for left and right halves Up to 750  m deviation from NIKHEF 3D?! Up to 1100  m deviation from design values?! Fit to all design values Rms deviation: 348  m

Planes and normal vectors Inner planes –ň right = (-1., , ) –ň left = (1., , ) Outer planes –ň right = (1., , ) –ň left = (-1., , ) Angles between planes –Outer: 1.18 mrad –Inner:1.32 –Inner-outer left:1.44 –Inner-outer right:0.92

Planes and normal vectors

Center Frame Distortions x 1000 design photogrammetry

Inner Frame Distortions x 1000 photogrammetry design

Run 1 – Left to right distance Rms deviation Run 1: 444  m tutdbdbutm

Calliper measurements on Center Frame Centerframe top –Upstream (design: ) –Downsteam –Middle Centerframe bottom –Upstream –Downstream Measured to machined surfaces on center frame Note: all distances shorter than design value (temperature effect –  T of 5 o gives 100  m Differences between up/downstream up to 200  m

Calliper measurements on Center Frame Centerframe top –Upstream (design: ) –Downsteam –Middle Centerframe bottom –Downstream With mounted spheres: Note: all distances shorter than design values Differences between up/downstream up to 100  m Outer spheres most probably mounted correctly for photogrammetry

Summary – so far Center Frame –NIKHEF 3D agrees well with design (~100  m) –NIKHEF 3D agrees with CERN calliper data –NIKHEF 3D for y and z agrees with photogrammetry –Photogrammetry x data disagree with all other measurements May 10, 2006 –Discussions with CERN alignment group –Discuss additional data

Orientation wrt Center Frame (Photogrammetry - I results) IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd All in mm Positive is too far out Wrt AllOuter

Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd All in mm Positive is too far out Wrt AllOuter

Orientation wrt Center Frame (Photogrammetry - I results) IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd All in mm Positive is too far out Wrt LeftOuter

Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd All in mm Positive is too far out Wrt LeftOuter

Photogrammetry – Run 1 R L OIOI

Photogrammetry – Run 2 R L OIOI

Reproducibility – Run 1 and 2 – x R L OIOI

Reproducibility – Run 1 and 2 – y R L OIOI

Reproducibility – Run 1 and 2 – z R L OIOI

Reposition detector supports

Rotations wrt Center Frame IP lotu lotm lotd lobdlobu litulitd libulibd limmlimd Wrt LeftOuter 200 (4) 0 (0) mm in second photogrammetry All in mm All blue points moved in Microns (rotations)

Orientation wrt Center Frame (Photogrammetry - I results) IP rotu rotm rotd robdrobu rituritd riburibd rimmrimd All in mm All points moved in Wrt LeftOuter 600 (12)400 (8) 500 (10) Hardstops Top 0.85  0.35 Upstream 0.65  0.25 Downstream 0.85  <0.05

Photogrammetry – Run 3

Compare – Run 1 and 3 – x R L OIOI

Compare – Run 1 and 3 – y R L OIOI

Compare – Run 1 and 3 – z R L OIOI

Run 3 – Crosscheck R L OIOI lotm mm

Run 1 and 3 – Left to right distance Rms deviation Run 1: 612  m Run 2: 110  m L – 0 R – 400 L – 200 R – 600 L – 0 R – 500 tutdbdbu  z  y

Run 1, 2 and 3 – Left to right distance Rms deviation Run 1: 444  m Run 2: 316  m Run 3: 388  m tutdbdbutm Run 2 and 3: 80  m difference 24 x (1.226 m) x (1.4 o C) = 41  m

Summary – so far Photogrammetry: Center Frame –for y and z agrees with NIKHEF 3D –Disagreement for x data Average deviation ~380  m Checked with calliper: agrees with NIKHEF 3D Reposition detector supports –Possible within 100  m accuracy This week –Alignment in LHCb pit Employ NIKHEF 3D data Provide independent check on x data