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I often see it mentioned that the selection of the launch site for Ariane 6 was one of the preliminary requirements that froze its final design. That does make sense, especially since there was some disagreement between DLR and CNES whether Ariane 6 should have a solid fueled first two stages or not, with solid core likely leaving less of a leaway in launcher's configurations, depending on which launch site it would operate from.

    Map of the Guiana Space Centre

    Map of the Guiana Space Centre, Kourou, French Guiana (Source: Wikimedia Commons)

The launch site selected was, expectedly so, French Guiana and a new launch pad will be build for this carrier rocket in the Guiana Space Centre, Kourou. What I didn't find anywhere is however which other launch sites were considered for this, now with finalized preliminary design, ESA's next generation launcher? So to my question:

Which other launch sites (except Kourou) were considered by ESA for Ariane 6, and what arguments eventually tipped the scale in favor of Kourou?

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I suspect you're referring to articles like this one:

With Ariane 6 Launch Site Selected, CNES Aims To Freeze Design of the New Rocket in July

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Taking advantage of work done years ago on what was then a quarry, CNES officials have selected a site to the north of the Ariane 5’s launch site for Ariane 6, an area called Roche Nicole. Quarry construction left a large pit, now filled with water, that will be used for the Ariane 6 flame trench.

CNES officials say that because of the quarry work, done to support launches of the now-retired Ariane 4 rocket, the flame trench is now the equivalent of 70 percent complete even though no work has begun on it.

CNES managers at the Guiana Space Center spaceport, on the northeast coast of South America, recall the difficulties they had in completing the flame pit for Russia’s Soyuz rocket, which is operated from the European spaceport under an agreement with the Russian government that expires at the end of 2016.

Given the way it's worded, I think the launch site was always going to be at Kourou. The only question was where within the spaceport the new platforms would be built. Because Ariane 6 was conceived as a cost-saving measure, it'd make little sense to develop an entirely new spaceport, especially as Kourou is ideally located for launches to equatorial orbits.

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    $\begingroup$ Yes, that's one such article, and I actually link to the same one near the beginning of my question. And I remember a few other, ESA's own press releases saying it in nearly identical way. But while I suspect you're correct in your latter assessment that Kourou was the only spaceport considered, I would like some reference for that. I.e. if some other spaceports, except Kourou, were ever competing or have been considered for the home of the Ariane 6. $\endgroup$ – TildalWave Dec 1 '13 at 13:18

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