Precise measurement of internal sense-wire locations in high energy physics detectors
1993
Abstract The central tracking region of the Solenoidal Detector Collaboration detector being designed to operate at the Superconducting Super Collider will utilize gas-filled straw tubes for particle tracking; the straws, each containing a thin central wire for charge collection, will be collected into modules of a few hundred straws each. It is crucial for proper interpretation of the data that the positions of the sense wires be known to very high precision. A pattern-deviation scanning system is being investigated for determining if the sense wires in constructed modules are within 35 μm of their intended locations. The system involves moving a module in steps through a broad x-ray beam and comparing a response matrix of transmission measurements to a template which is characteristic of a “perfectly” aligned module. The pattern-deviation scanner approach is described and simulation results are presented.
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