This report (link is to a PDF) is a good look at the troubles that come with plain Fresnel Array concentrators. There might be some subtle differences for Cassegrain collectors... but all these high concentration operations have some serious consequences on the expense and complexity front....
For an example of a Casegrain array look at SolFocus.
The concerning items include extreme aging of the cells (hard job) Risk at misfocus (although they had some good news there for the Fresnel, safety wise...) the demanding focus/tracking requirements. A good read and a hint as to why I think we need a different approach.
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