The Engineering Model (EM) of TAUVEX in one of the clean rooms of
El-Op. The optical module (OM) is mounted on a (black) supporting
stand. Visible are the beryllium bezel on which the three telescope
assemblies are mounted. The telescope assemblies are shielded from
direct Solar radiation by a very thin shield (see Fig. 2), visible
on the right side of the image. On the left, protuding from the bezel,
the three detector enclosures are visible. The mass of the OU is
18 kg and it requires up to 20W, mostly for active thermal control.
The EM seen from the sky side. Only one optical assembly is mounted
in the center location. The weight-relieving machining of the bezel
is visible in the left telescope, where the primary mirror is not
mounted. The internal design of the shield includes many internal baffles
which reduce scattered light and prevent Sunlight from reaching the
focal plane with the Sun in the forward positioin.
The Electronic Unit (EU) of TAUVEX contains 14 printed circuit cards
which are visible with the EU open. The different elements in the EU are
analog front ends for the three telescopes, a doubly-redundant digital
signal processor, a doubly-redundant central processor unit, power
conditioning units, image buffer solid-state storage, two doubly-
redundant disk storage units, and six high voltage power supplies.
The mass of the EU is 14 kg and it requires up to 25W to operate (and
up to 20W for active temperature control).
During qualification tests of SODART, the construction will
be vibrated and shocked before being integrated with the whole SRG
spacecraft. As preparation for this, at the Lavotchkin industries
the TM of TAUVEX has been installed in its location on the sky side
of SODART. Dr. Elhanan Almoznino fro Tel Aviv University and Mr.
Rafy Hershkowitz from El-Op supervised this installation. The TAUVEX
TM is covered by its protective cover (manufactured by the Babakin
Space Research Center).
The SODART structure, with TAUVEX integrated alongside the two
SODART X-ray telescopes, are supported by a special device to allow
testing of the deployment mechanism in a quasi-gravitationless
situation. The device is the U-like grey structure on the right
and center parts of the image.
The SODART structure is half-open from the launch (folded)
configuration to the open (operational) configuration. The image
and the humans around the structure give an impression of the
size of SODART and of SRG.
The TAUVEX TM and the two SODART telescopes with
covers closed, at the Lavotchkin industries. The protective
cover of TAUVEX is equipped with a pressure-relief valve (round
dark device in the center of the ribbed structure). TAUVEX itself
is covered by thermal blankets. These consist of ten layers of very
thin aluminized mylar, some which are electrically conducting
and are grounded. The outer thermal blanked has a pure gold coating.
The TAUVEX TM during its thermal tests at iABG (an ESA testing
facility near Munchen, Germany). The TM is installed in a thermal
vacuum chamber, where it is illuminated by a Solar simulator. It
is possible to simulate fully different aspects of Solar illumination
and the status of "eclipse", which is very rare but potentially
dangerous for TAUVEX. The simulations demonstrated the compliance
the the thermal design, and showed that TAUVEX will operate
properly in the different environmental conditions within the
operating envelope of SRG.
Mr. Zvi Rot (El-Op) during the integration of the special
sealing gasket of the TAUVEX TM. The gasket seals the internal
part of the OU from external contaminants and provides a flexible
interface between the very fragile shield (see fig. 2) and the
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