1. BML chamber assembly Maria Curatolo LNF/INFN

2. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Granite Table Granite table (on 3 feet) flatness  20  m over the total surface(4500*2500 mm 2 ) Temperature controlled (8 sensors attached to the granite) T=23.5  1  C (room) Humidity control (room) H=(50  5)%

3. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Granite table map

4. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Jig measurements Combs measurement summary Av. pitch (all combs): 30.0353  0.0001 (RMS) mm RMS of Residuals (with Av. Grid): 2.9  m (all combs)  1.9  m (best 7) Av. Y-coord. (all combs) 121.726  0.009 (RMS) mm  2.7  m (best 7) Precision tower (with interfaces) measurement summary (see table)

5. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Combs

6. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Precision towers

7. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Precision towers

8. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Jig assembly procedure Granite ruler for correct alignment of the reference side towers and comb reference blocks Shimming  30  m under all the intermediate comb feet for compensation of difference in diameter of tubes and endplug reference surface Orthogonality of outer comb side B to the line of the reference side towers  granite ruler and square

9. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Jig assembly procedure Parallelism of outer comb side A to outer comb side B  equal distance between them at the two extremities, near ref towers and near non-ref towers Same method for the intermediate combs

10. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Jig fixation to the granite table Comb fixations to the granite table allow for sliding in z-direction (fixed point at the ref side extremity) Comb movement in x-direction limited to  50  m in case of accidental clash

11. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Vacuum system realized in separate sectors (3 for every comb) Very simple gluing machine (industrially treated for ant adherence) Very finely adjustable speed crane Sequence of gluing steps minimizing the number of tower interface changes

12. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Assembly steps

13. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Assembly steps

14. Maria Curatolo L.N.F. / I.N.F.N. Frascati 21/7/2000ATLAS - MDT Site Review Assembly table