Differences
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| themis:technical [2024/12/11 11:59] – etienne | themis:technical [2024/12/13 15:52] (current) – etienne | ||
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| - | ===== THEMIS | + | ===== THEMIS technical description ===== |
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| The 90cm primary mirror of THEMIS is made of ... and coated with... | The 90cm primary mirror of THEMIS is made of ... and coated with... | ||
| The secondary mirror has a size of and is ... | The secondary mirror has a size of and is ... | ||
| + | |||
| + | The telescope tube has a length of ... | ||
| + | While originally design to be vacuum sealed, the telescope tube is filled with Helium at 0.5 local atmospheric pressure. This enables optimum performance in order to reduce turbulence within the telescope tube and stress on the entrance plate (which would have been excessively important under vacuum conditions. | ||
| + | |||
| + | The THEMIS telescope is actively cooled by a water heat-exchanger system thanks to... | ||
| + | This allows to have typical working temperature of about 5-10°C on the different system | ||
| The entrance pupil of the THEMIS telescope tube... | The entrance pupil of the THEMIS telescope tube... | ||
| - | The telescope tube has a length of | ||
| Overall the weight of the THEMIS telescope assembly is about... | Overall the weight of the THEMIS telescope assembly is about... | ||
