Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 1 Bedanga Mohanty, VECC, Kolkata ALICE PMD alignment issues  Align-able parts  Alignment.

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Presentation transcript:

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 1 Bedanga Mohanty, VECC, Kolkata ALICE PMD alignment issues  Align-able parts  Alignment targets  How to implement in simulation  Correct the misalignment Outline --

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 2 Align-able parts of PMD Each plane has 24 modules which will be mounted separately on steel plates.The precision of distances between modules mounted on the steel plates is well controlled. PMD has 2 planes : Veto and preshower So align-able parts of the PMD are (i) steel plates (ii) distance between the two planes (iii) Cells of two planes

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 3 Alignment targets Auto-cad picture of PMD Planarity problems and shift in steel frame in one direction possible. Possible survey points for PMD co-ordinates and alignment Alignable screws Some alignment possible by adjusting the align-able screws

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 4 PMD Module co-ordinates Each of the corner cell position in 48 modules of the PMD is known from hardware and relative distances between modules also know These are implemented in software : GEANT Alignment of PMD modules and planes as per actual position can be implemented

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 5 Misalignment study (simulation) AlignedMisaligned One possibility

Bedanga MohantyALICE offline meeting, CERN, Oct :3 rd – 7 th 6 Summary (1)The steel frame and the distance between two planes of PMD are the align-able parts (2) Survey to give us the PMD co-ordinates at specific points. We can calculate the distance of this from the PMD cell positions (3)These then can be incorporated in simulations (4)Back-to-back alignment of cells on two planes of PMD is essential for a good discrimination of photon and charged hadrons. (5) Work on alignment algorithms to correct for misalignment in progress….