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SBS Optics and Spin Transport

A review and analysis of the Super BigBite Spectrometer focusing on optics and spin transport. This review discusses the measurement of target parameters and evaluates higher order effects. It also proposes strategies for using SNAKE to create trajectory databases and determine errors through Monte-Carlo simulations.

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SBS Optics and Spin Transport

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  1. SBS Optics and Spin Transport John J. LeRose Technical Review of the Super BigBite Spectrometer November 17, 2008

  2. This is what it looks like to me!

  3. 1st Order Optics e.g. Etc. Subsequently: If you know how well you can measure x, x’, y, and y’, you know how well you can determine the target parameters (provided xtar = 0)

  4. Projected Errors

  5. Higher Order Effects? • Strategy: • Use SNAKE to create a database of trajectories and then fit the reconstruction tensor. (higher order terms) • Use the reconstruction tensor in a Monte-Carlo fashion to evaluate the errors.

  6. Momentum Dependence of ΔΩ 8 GeV/c 1 GeV/c

  7. Spin Transport Non-dispersive precession Dispersive precession Target Target to Reaction Plane Reaction Plane

  8. Spin Transport Because of Pl - Pt mixing, the non-dispersive bend angle contributes a factor ~100 to the FF ratio systematic error. However, it is very small: ±1.1 mrad (FWHM) and can be reconstructed with high precision (~0.1mrad).

  9. Still to do (optics wise anyway) • Finalize magnet and insert 3-D map into SNAKE • Repeat analysis described here • …

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