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Why not do the whole 12 GeV upgrade by refurbishment?

April 26, 2017gev refurbishment upgrade

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Why not do the whole 12 GeV upgrade by refurbishment?

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While it is clearly advantageous to refurbish some number of cryomodules to achieve stable 6 GeV operation ahead of the upgrade, estimates consistently indicate that it is more cost effective to switch to building new modules in new zones once project funds become available and the stock of underperforming old modules is used up. The exact crossover point will depend on the level of success of refurbishment and the exact cost of new zones.