Optical Characterization and Performances of Aerogel Radiator L.Barion, G.Battaglia, M. Contalbrigo, P. Lenisa, A.Movsisyan, L. Pappalardo, M. Turisini.

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Presentation transcript:

Optical Characterization and Performances of Aerogel Radiator L.Barion, G.Battaglia, M. Contalbrigo, P. Lenisa, A.Movsisyan, L. Pappalardo, M. Turisini INFN Ferrara CLAS12 RICH internal review Frascati: June 24

2 Introduction Aram Movsisyan, June Single photon angular resolution: Direct light (mrad) Reflected light (mrad) Emission Point1.7 Readout Accuracy Mirror System-<1 Chromatic Aberration Aerogel Optical Prop.~1~2 Required criteria for the aerogel tiles: Scattering Length> 43 mm Absorption> 95% Density0.224< <0.244 g/cm 3 Planarity<1.5 mm

3 Aerogel Characteristics in the Air Aram Movsisyan, June Monitoring the time dependence of the weight of aerogel tile in environment of non-zero humidity. Monitoring the time dependence of the transmission of aerogel tile in environment of non-zero humidity.

4 Aerogel Characteristics in the Air Aram Movsisyan, June

5 Aerogel Characteristics in the Dry Box Aram Movsisyan, June Monitoring the recovery of the weight of aerogel tile in dry box.

6 Measurements with Spectrophotometer Aram Movsisyan, June

7 Aerogel Surface Measurement Aram Movsisyan, June mm Screen Laser Beam normal in lab. frame [10º-50º] R Surface reflection CCD Camera Aerogel Description of the setup

8 Aerogel Surface Measurement Aram Movsisyan, June mm Screen Laser Beam normal in lab. frame [10º-50º] R Surface reflection CCD Camera Aerogel Description of the setup Scan of aerogel surface CCD camera [ThorLabs DCU 224c] Sensitive area [ mm]. Sensitive area [ mm]. Resolution [ pixels]. Resolution [ pixels]. Pixel size 4.65 m. Pixel size 4.65 m.

9 Aerogel Surface Measurement Aram Movsisyan, June mm Screen Laser Beam normal in lab. frame [10º-50º] R Surface reflection CCD Camera Aerogel Description of the setup Scan of aerogel surface CCD camera [ThorLabs DCU 224c] Sensitive area [ mm]. Sensitive area [ mm]. Resolution [ pixels]. Resolution [ pixels]. Pixel size 4.65 m. Pixel size 4.65 m. Distributions of X & Y positions of the spot

10 Aerogel Surface Measurement Aram Movsisyan, June mm Screen Laser Beam normal in lab. frame [10º-50º] R Surface reflection CCD Camera Aerogel Description of the setup [rad]

11 Aerogel Surface Measurement Aram Movsisyan, June [mm]

12 Aerogel Surface Measurement Aram Movsisyan, June Comparison of current measurements with the results provided by producer [mm]

13 Light Dispersion Measurement Aram Movsisyan, June mm Mirror Screen Laser Beam normal in lab. frame symmetric reflection meas. reflection R ΔxΔx CCD Camera Description of the setup [10º-50º] Setup reflects realistic experimental conditions. Setup reflects realistic experimental conditions. Reference measurement taken without aerogel. Reference measurement taken without aerogel. Deviation of the laser spot position around the reference point provides a measure of light dispersion. Deviation of the laser spot position around the reference point provides a measure of light dispersion.

14 Light Dispersion Measurement Aram Movsisyan, June Impact of the surface shape on the light dispersion: Contribution of the surface shape on light dispersion can be approximated: Refraction from the ideal surface: Refraction from the surface with certain gradient:

15 Aram Movsisyan, June Light Dispersion Measurement Measurement at 10˚: light dispersion after double passage through double passage through the aerogel light dispersion after reflection from the aerogel surface

16 Angular Dependence of Light Dispersion Aram Movsisyan, June Simulated light dispersion as a function of incident angle: Current measurement of light dispersion as a function of incident angle:

17 Forward Scattering Aram Movsisyan, June mm CCD Camera Laser Beam R Scattering of the light in the medium due to the anisotropy of the dielectric properties caused by the microscopic fluctuations. Scattering of the light in the medium due to the anisotropy of the dielectric properties caused by the microscopic fluctuations. Description of the setup Examples of X & Y profiles of the spot [mm] Analysis steps. Analysis steps. Reference measurement taken without aerogel. Reference measurement taken without aerogel. Extract angular dependence of the intensity after passage trough the aerogel. Extract angular dependence of the intensity after passage trough the aerogel. Extract an increase of the width of laser beam compared with reference measurement. Extract an increase of the width of laser beam compared with reference measurement.

18 Forward Scattering Aram Movsisyan, June Angular dependence of the measured intensity: Differential of the measured intensity:

19 Conclusion Aram Movsisyan, June Tools for measurements and monitoring of the aerogel characteristics are operational and have stable performance. Mismatch between the measurements done in Novosibirsk and in Ferrara was observed, indicating the necessity to bake the aerogel before delivery. Corresponding agreement was obtained with the producer. Ongoing measurements attempt to optimize the specifications vs production rate. Currently 25% of the main production is ready for delivery.