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| technical:building [2024/12/20 10:25] – bgelly | technical:building [2025/01/17 13:00] (current) – etienne | ||
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| - | Giving the high angular resolution and the high sensivity | + | The iconic THEMIS building, with its cylindrical tower and closed spherical dome, has been build between 1993 and 1996. The THEMIS building specific design results from the need to maximise image quality. |
| - | * As with all modern professional solar observational facilities, the collection of the solar light by the telescope is done at several tens of meters of altitude, in order to be above the most turbulent layers that are close to the ground. In the case of THEMIS, the telescope is located at 22.5 meters high, under the dome at the THEMIS building. | + | |
| + | The THEMIS telescope is installed inside the upper part of a 22.5m long cylindrical tower. The frontal part of the telescope is closed by a sort of window which allows the telescope to be vacuum-sealed thus avoiding heavy temperature variations. A ~9m diameter dome protects the instrument. | ||
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| + | [[results: | ||
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| + | === Turbulence reduction === | ||
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| + | Giving the high angular resolution and the high sensitivity | ||
| + | * As with all modern professional solar observational facilities, the collection of the solar light by the telescope is done at several tens of meters of altitude, in order to be above the most turbulent layers that are close to the ground. In the case of THEMIS, the telescope is located at 22.5 meters high, under the dome of the THEMIS building. | ||
| * White gravel has been placed around building to increase the reflection of light in the surroundings of the building, and thus reduce ground heating and turbulence. | * White gravel has been placed around building to increase the reflection of light in the surroundings of the building, and thus reduce ground heating and turbulence. | ||
| * Rounded shapes of the building and building orientation favors stable/ | * Rounded shapes of the building and building orientation favors stable/ | ||
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| * White-painted aluminium cladding and the tightly fitted dome aperture to the telescope allows to reduce heat absorption and heat transfer, hence reducing turbulence within the building. | * White-painted aluminium cladding and the tightly fitted dome aperture to the telescope allows to reduce heat absorption and heat transfer, hence reducing turbulence within the building. | ||
| * Inner concrete tower, independent of the main building, to prevent the transmission of vibrations to instruments | * Inner concrete tower, independent of the main building, to prevent the transmission of vibrations to instruments | ||
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| + | === Rotating dome === | ||
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| + | The 9m rotating dome has been [[https:// | ||
| + | The dome has a spherical shape and it is divided into two parts: the rotating dome which rotates around the azimuth axis (dome lower part) and the rotating cap (the dome upper part) which rotates around the pseudo elevation axis with an inclination of 45°. | ||
| + | The rotating cap is provided with an aperture for the telescope observations. The combination of the azimuth and pseudo elevation rotations allows the aperture to follow the movements of the telescope with extreme precision. The building insulation is guaranteed by thermo-acoustic insulating panels, plus aluminium perforated sheets. | ||
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