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CHAPTER 17 - NEUTRON FOCUSSING LENSES 17:1. NEUTRON TRAJECTORY 17:2. THE PRISM DEFLECTION ANGLE 17:3. CONTRIBUTION TO THE Q RESOLUTION 17:4. CONTRIBUTION.

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Presentation on theme: "CHAPTER 17 - NEUTRON FOCUSSING LENSES 17:1. NEUTRON TRAJECTORY 17:2. THE PRISM DEFLECTION ANGLE 17:3. CONTRIBUTION TO THE Q RESOLUTION 17:4. CONTRIBUTION."— Presentation transcript:

1 CHAPTER 17 - NEUTRON FOCUSSING LENSES 17:1. NEUTRON TRAJECTORY 17:2. THE PRISM DEFLECTION ANGLE 17:3. CONTRIBUTION TO THE Q RESOLUTION 17:4. CONTRIBUTION TO MINIMUM Q 17:5. MEASUREMENTS WITH GRAVITY CORRECTING PRISM

2 17:1. NEUTRON TRAJECTORY source aperture sample aperture 2D area detector L1L1 L2L2 prism

3   17:2. THE PRISM DEFLECTION ANGLE Neutron trajectory: Spot on detector: Prism deflection angle:

4 Without Prisms With Prisms 17:3. CONTRIBUTION TO THE Q RESOLUTION geometry gravity wavelength spread

5 17:4. CONTRIBUTION TO MINIMUM Q geometry gravity With prisms Without prisms

6 17:5. MEASUREMENTS WITH GRAVITY CORRECTING PRISMS 3 cm 0.5 cm

7 COMMENTS -- Long wavelength neutrons fall due to gravity. -- Gravity drops the beam spot on the detector and distort its symmetry (from circular to elliptical shape). -- Refractive prisms correct for the gravity effect by raising the beam spot on the detector and correcting its shape back to circular.

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