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NSO Thermal Study 349 channel 5mm DM

Study on thermal distortion and correctability with weather data analysis. Peak flux exceeds specification, with detailed convection coefficients and surface temperature profiles.

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NSO Thermal Study 349 channel 5mm DM

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  1. NSO Thermal Study349 channel 5mm DM Jeffrey Cavaco September 31, 2009

  2. Weather Data Analysis • Actual weather data sent by Kit Richards on 9/25/2009 • Note peak flux is 50% greater than specification

  3. Weather Data Analysis • Convection coefficient of 5 W/(m^2.K), 18°C bulk temperature • One face of bezel cooled to 17°C during entire cycle • Facesheet heats to 19°C peek temperature Facesheet Base

  4. Weather Data AnalysisThermal Distortion and Correctability Thermal Distortion Actuated Surface Residual Error • 61nm PV • 12nm rms • 21nm PV • 2nm rms

  5. Zernike Decomposition

  6. Step Function Analysis • Profile • 1 hour at 50 W/m^2 • 1 hour at 0 W/m^2 • 1 hour at 50 W/m^2

  7. Step Function Thermal Analysis • Convection coefficient of 5 W/(m^2.K), 18°C bulk temperature • One face of bezel cooled to 16.5°C during entire cycle • Facesheet heats to 19°C peek temperature Facesheet Base

  8. Step Function AnalysisThermal Distortion at 1 hour Thermal Distortion Actuated Surface Residual Error • 31nm PV • 7nm rms • 9nm PV • 1nm rms

  9. Zernike Decomposition

  10. Step Function 2 Analysis • Profile • 1 hour at 0 W/m^2 • 1 hour at 50 W/m^2 • 1 hour at 0 W/m^2

  11. Step Function 2 Thermal Analysis • Convection coefficient of 5 W/(m^2.K), 18°C bulk temperature • One face of bezel cooled to 16.5°C during entire cycle • Facesheet heats to 18.8°C peek temperature Facesheet Base

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