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QM2 Analysys

This study presents an in-depth analysis of the beam profile and volume reflection versus various angles within specified regions of a crystal. It explores the efficiency of channeling, emphasizing the linear dependence of channeling angle on vertical positioning and crystal orientation. Key metrics include reflection angles, slopes, and efficiency values across specific ranges, revealing significant insights into crystal torsion and lighting effects. The relationship between channeled angles and crystal orientation is characterized by linearity, highlighting potential calibration discrepancies.

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QM2 Analysys

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  1. QM2 Analysys Perugia Group

  2. Beam Profile Selected Beam region X [-1.5, -0.35] mm Selected Beam region Y [10, 11.5] mm

  3. Volume Reflection vs X VR angle almost flat vs X in the range [-1.5, -0.8] mm VR 11.7+/-0.2 rad Slope of 1.8 rad/mm in the range [-0.8, 0.35] mm VR [11.7 , 12.6] rad

  4. Volume Reflection vs Y Xrange [-1.5, -0.8] Xrange [-0.8, -0.35] VR angle almost flat vs Y in the X range [-1.5, -0.8] mm VR 11.7+ 0.2-0.1rad VR angle almost flat vs Y in the X range [-0.8, -0.35] mm VR 12.0+ 0.2-0.1rad

  5. VR Efficiency Efficienza X range [-1.5, -0.80] = 98.27 +/- 0.04 Efficienza X range [-0.8, -0.35] = 98.75 +/- 0.04 Efficienza X range [-1.5, -0.35] = 98.31 +/- 0.04

  6. Channelling vs Y Efficiency 51.9 +/- 1.6 % Channelling angle at maximum efficiency = 68.6 +/- 0.2 rad

  7. Crystal torsion Vs Y Position of max channelling has a linear dependence on the vertical coordinate which can be interpreted as a crystal torsion The slope is 3.3 rad/mm

  8. Channeling Efficiency and linearity The relation between the channelling angle (distance of the left peak from a reference point) and the crystal orientation angle is linear with a slope of 1.09. The fact that the slope differs from 1 can arise from the goniomiter calibration accuracy. Max channelling orientation is obtained from a gaussian fit to the Channeeling efficiency as function of the crystal angle. The different curves correspond to different Y slices

  9. Channelling vs X Analysis done on a 0.5 mm slice on Y [11,11.5] mm to disentangle the torsion effect Efficiency = 51.6 +/- 1.3 % Channelling angleCH = 68.8 +0.6-0.8 rad

  10. Channelling vs X (2) Analysis done on a 0.5 mm slice on Y [11,11.5] mm to disentangle the torsion effect Orientation of max channelling seems not depending on X

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