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Optical Characterization and Performances of Aerogel Radiator

This paper discusses the optical characterization and performance of aerogel radiator tiles in different environments. The study includes monitoring the weight and transmission of the aerogel tiles in both humid and dry conditions, as well as measuring the surface properties and light dispersion. The results highlight the importance of proper handling and baking of the aerogel before delivery to ensure accurate measurements and optimal performance.

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Optical Characterization and Performances of Aerogel Radiator

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  1. 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 Single photon angular resolution: Required criteria for the aerogel tiles: 2 Aram Movsisyan, June 24 2015

  3. Aerogel Characteristics in the Air 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. 3 Aram Movsisyan, June 24 2015

  4. Aerogel Characteristics in the Air 4 Aram Movsisyan, June 24 2015

  5. Aerogel Characteristics in the Dry Box Monitoring the recovery of the weight of aerogel tile in dry box. 5 Aram Movsisyan, June 24 2015

  6. Measurements with Spectrophotometer 6 Aram Movsisyan, June 24 2015

  7. Aerogel Surface Measurement Description of the setup Laser Beam 30 mm Aerogel šœƒ [10Āŗ-50Āŗ] normal in lab. frame Surface reflection CCD Camera Screen R 7 Aram Movsisyan, June 24 2015

  8. Aerogel Surface Measurement Description of the setup Scan of aerogel surface ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . Laser Beam 30 mm Aerogel šœƒ [10Āŗ-50Āŗ] normal in lab. frame Surface reflection CCD Camera Screen R ā€¢ CCD camera [ThorLabs DCU 224c] ā€¢ Sensitive area [ 5.95 - 4.76 mm]. ā€¢ Resolution [ 1280 - 1024 pixels]. ā€¢ Pixel size 4.65 šm. 8 Aram Movsisyan, June 24 2015

  9. Aerogel Surface Measurement Description of the setup Scan of aerogel surface ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . ā€¢ . . . . . . . . . . . . . Laser Beam 30 mm Aerogel šœƒ [10Āŗ-50Āŗ] normal in lab. frame Surface reflection CCD Camera Screen R Distributions of X & Y positions of the spot ā€¢ CCD camera [ThorLabs DCU 224c] ā€¢ Sensitive area [ 5.95 - 4.76 mm]. ā€¢ Resolution [ 1280 - 1024 pixels]. ā€¢ Pixel size 4.65 šm. 9 Aram Movsisyan, June 24 2015

  10. Aerogel Surface Measurement Description of the setup Laser Beam 30 mm Aerogel šœƒ [10Āŗ-50Āŗ] normal in lab. frame Surface reflection CCD Camera Screen R [rad] [rad] 10 Aram Movsisyan, June 24 2015

  11. Aerogel Surface Measurement [mm] [mm] [mm] [mm] 11 Aram Movsisyan, June 24 2015

  12. Aerogel Surface Measurement [mm] Comparison of current measurements with the results provided by producer 12 Aram Movsisyan, June 24 2015

  13. Light Dispersion Measurement Description of the setup ā€¢ Setup reflects realistic experimental conditions. ā€¢ Reference measurement taken without aerogel. ā€¢ Deviation of the laser spot position around the reference point provides a measure of light dispersion. Laser Beam 30 mm šœƒ [10Āŗ-50Āŗ] normal in lab. frame symmetric reflection meas. reflection Mirror Ī”x CCD Camera Screen R 13 Aram Movsisyan, June 24 2015

  14. Light Dispersion Measurement Impact of the surface shape on the light dispersion: Refraction from the ideal surface: Refraction from the surface with certain gradient: Contribution of the surface shape on light dispersion can be approximated: 14 Aram Movsisyan, June 24 2015

  15. Light Dispersion Measurement Measurement at 10Ėš: light dispersion after double passage through the aerogel light dispersion after reflection from the aerogel surface 15 Aram Movsisyan, June 24 2015

  16. Angular Dependence of Light Dispersion Simulated light dispersion as a function of incident angle: Current measurement of light dispersion as a function of incident angle: 16 Aram Movsisyan, June 24 2015

  17. Forward Scattering Description of the setup Scattering of the light in the medium due to the anisotropy of the dielectric properties caused by the microscopic fluctuations. 30 mm R Laser Beam CCD Camera Examples of X & Y profiles of the spot ā€¢ Analysis steps. ā€¢ Reference measurement taken without aerogel. ā€¢ Extract angular dependence of the intensity after passage trough the aerogel. ā€¢ Extract an increase of the width of laser beam compared with reference measurement. [mm] [mm] 17 Aram Movsisyan, June 24 2015

  18. Forward Scattering Angular dependence of the measured intensity: Differential of the measured intensity: 18 Aram Movsisyan, June 24 2015

  19. Conclusion 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. 19 Aram Movsisyan, June 24 2015

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