Alignment Global-rotation tests of whole SECTORS were done with simulations to check procedures (not the best choice to start as it turns out!) Finding.

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Presentation transcript:

Alignment Global-rotation tests of whole SECTORS were done with simulations to check procedures (not the best choice to start as it turns out!) Finding -1: Inner Ladder’s Inverted Coordinate system (due to physical inversion) results in complicated output (sign inversion etc) See slide-2 upper-left histo for example We have (testing now) a scheme to undo this. Seems o.k. so far (effective inversion in alignment), see Slide-5 We will have the same “problem” with IST/SSD (facing inwards) Finding-2: Results (Global/Local) are for individual Ladders. G/L refers to coordinates used NOT to the results. Global translations will be common to all. The same with gamma rotation due to parallel ladders. See slide-3 (data !) and slide-2 upper-right histogram Global alpha or beta rotations (around x or y axes) introduce both ladder-local alpha/beta rots depending on the individual ladder orientation (slide-4) There is Math (and it seems we already have the histos, e.g. slide-4 upper left histogram) to do solid object (sector) alignment as a whole but for now results from individual ladders are going to be used first. We need more thorough tests and clarification

SIMULATION Jonathan’s Input: Sector-1 d-gamma ( around z-axis ) = degrees = -13 mrad Left histogram: Result is fine but inner/outer ladder effect is obvious. Right histogram w/out inner I get from histo: ~-13 mrad OK Comment: Since all ladders are parallel to z-axis this rotation is the easiest to get 1 1

DATA : Day152 “Demonstrating” that Global DX, DY common to all ladders in sector Sector-4 Global dX ~0. (~ microns) Sector-7 Global dX mm Sector-4 Global dY -200 to -400 microns Sector-7 Global dY -1.1 to -2.8 mm

Jonathan’s SIMU Input: Sector 1 dalpha = -1 0 = I get from upper-left histo: ~ OK This histo seems immune to ladder # Upper right shows the three effective Ladder-local dalpha bands Lower histo shows the three effective ladder-local dbeta bands 1 1 1

Changes made: -Updated geometry used by runHftTree.C: Inverted directions of u and w axis (in local coordinates) for the inner ladders. -Inverted the value of booked u coordinate for hits in inner ladders. -Tested with single muon tracks hitting ladders 1 and 3 (nearly parallel) in sector 7. Original Inverted Local u and prediction uP inverted Track angles in inner and outer layer now have same sign Global coords. unchanged