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n_TOF EAR-1 Simulations Spatial profile & beam interception factor

n_TOF EAR-1 Simulations Spatial profile & beam interception factor. A. Tsinganis (CERN/NTUA) , V. Vlachoudis (CERN), C. Guerrero (CERN) and others. n_TOF Analysis Group Meeting CERN, April 18, 2012. Geometry. EAR-1 Simulations: neutron fluence

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n_TOF EAR-1 Simulations Spatial profile & beam interception factor

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  1. n_TOF EAR-1 SimulationsSpatial profile & beam interception factor A. Tsinganis (CERN/NTUA), V. Vlachoudis (CERN), C. Guerrero (CERN) and others n_TOF Analysis Group Meeting CERN, April 18, 2012

  2. Geometry EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  3. Spatial profile EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  4. Beam interception factor • How much – and what part – of the beam hits a sample of radius R? • Dependent on energyand geometry • Different samples / geometries studied EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  5. Beam interception factor • BIF calculated for 1, 2 & 3cm diameter samples @184m EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  6. Beam interception factor • Influence of gravity EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  7. Beam interception factor • Normalising at 5eV… • …differences in the shape and the 5eV-to-thermal ratio emerge 1% 2.5% EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  8. Beam interception factor • Beam-line alignment • Tested for 3 cases • Realistic collimation setup • Aligned • “Ideal” alignment <0.5% normalised @5eV 1 % EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  9. Beam interception factor • Sample alignment • x- and y-offsets of 2mm • Changes in the shape and the 5eV-to-thermal ratio! 1.5% 6 % EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  10. Conclusions • The 5eV-to-thermal ratio is sensitive to various parameters • The sample alignment is the most relevant • These uncertainties have been quantified • Normalising at 5 eV, the value at thermal in the worst case can change ~6% • Nevertheless, a +/- 2mm offset of the sample is perhaps too pessimistic • This source of uncertainty should be kept in mind during pertinent data analysis • BIF(E) for specific sample size and position available upon request EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

  11. The end EAR-1 Simulations: neutron fluence n_TOF Analysis Group Meeting – CERN, April 18, 2012 | A.T.

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