A. Jeremy Kropf
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Notes on Filtering
- Carefully assess whether aluminum can be used for low energy filtering, especially for high-energy modes. Aluminum has a significantly higher (total cross-section)/(incoherent cross-section) ratio than carbon graphite. A detailed calculation needs to be performed to look at the effects of carbon vs. aluminum secondary sources: especially photon flux vs. photon energy. A lower incoherent cross section should ameliorate the effects of a second source of x-rays not at the nominal source point.
- Can a lower energy mode be engineered (4.5 - 8 keV) even at the cost of reducing the horizontal acceptance of the beamline. Losing a factor of two intensity for the lowest energy mode isn't too high a price to pay for being able to measure Ti, V, Cr and all of the rare earth L edges.