Secondary Mirror of ELT Successfully Cast

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Largest convex counterpart vacant ever created

ESO’s 39-metre Extremely Large Telescope (ELT) will be a largest telescope of a kind ever built when it achieves initial light in 2024. A new miracle has now been reached with a casting of a telescope’s delegate counterpart (M2), that is incomparable than a primary counterpart of many of today’s investigate telescopes.

The casting of a delegate counterpart vacant for ESO’s Extremely Large Telescope (ELT) has been finished by SCHOTT during Mainz, Germany. The finished counterpart will be 4.2 metres in hole and import 3.5 tonnes. It will be a largest delegate counterpart ever employed on an visual telescope and also a largest convex counterpart ever produced.

The counterpart vacant is a expel retard of component — in this box Zerodur® glass-ceramic [1] — that will afterwards be belligerent and discriminating to furnish a finished mirror. In Jan 2017, ESO awarded SCHOTT a agreement to make a M2 counterpart vacant (eso1704). ESO has enjoyed a cultivatable partnership with SCHOTT, who also constructed a 8.2-metre meniscus categorical mirrors for a Very Large Telescope during ESO’s Paranal Observatory (ann12015). A manufacturer of well-developed astronomical products to a really high standard, SCHOTT has already delivered a blanks of a deformable skinny bombard mirrors that will make adult a ELT’s quaternary mirror, M4 (ann15055), and will also yield a vacant of a tertiary M3 mirror.

The vacant of a delegate counterpart now has to go by a delayed cool-down, machining and feverishness diagnosis method over a subsequent year. It will afterwards be prepared to be belligerent to precisely a right figure and polished. The French association Safran Reosc will lift this out, along with additional contrast (ann16045). The vacant will be made and discriminating to a pointing of 15 nanometres (15 millionths of a millimetre) opposite a whole visual surface.

When finished and installed, a M2 counterpart will hang upside down above a telescope’s outrageous primary counterpart and forms a second component of a ELT’s novel five-mirror visual system. The counterpart is strongly winding and aspheric and is a vital plea to make and test.

Source: ESO

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