Differences

This shows you the differences between two versions of the page.

--- themis:technical [2024/12/11 11:57] – etienne
+++ themis:technical [2024/12/13 15:52] (current) – etienne
@@ Line 1: / Line 1: @@
-===== THEMIS general technical description =====
+===== THEMIS technical description =====
 <html><font color="#ff0000" size="0.5"> In construction ; Last Update December 2024</font></html>
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 <html><font color="#0000ff"> Text in blue highlights a data product and shall redirect to the dedicated</font></html> [[observation:data|THEMIS data products webpage]].
-==== 1. Telescope Assembly ====
+==== 1) Telescope Assembly ====
 <html><font color="#ff0000" size="0.5"> Information on mirror and general description to be added</font></html>
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 The 90cm primary mirror of THEMIS is made of ... and coated with...
 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 telescope tube has a length of
 Overall the weight of the THEMIS telescope assembly is about...
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 <html><font color="#ff9900"> No user option available here. </font></html>
-==== 1'. Polarimetric analyser ====
+==== 1') Polarimetric analyser ====
 <html><font color="#ff0000" size="0.5"> Information to be added</font></html>
-==== 2. Full-Sun guider ====
+==== 2) Full-Sun guider ====
 <html><font color="#ff0000" size="0.5"> Status of Nighttime guider?</font></html>\\