[Halld-tagger] [EXTERNAL] alternate source for single-crystal diamonds

[Richard Jones]

Hello Eugene,

Today I received a quote for single-crystal diamond plate from New Diamond.
This seems to be a Russian company that is marketing HPHT type IIa
diamonds. These samples are 500 microns thick, 8mm x 8mm on a side, and cut
with 001 direction normal to the flat surface which is what we want. The
big price difference is in the what they call the number of zones. If you
want a single zone, the price is much higher than what they call the
multi-zone samples. In our experience, these multi-zone samples have very
large rocking curves, but the single-zone might very well satisfy our
requirements. Here is the quote. I recommend that we purchase several of
both types, not just one, as the chance of getting a bad one is quite high
with these HPHT samples.

Starting from 500 microns thickness, I think each one could be split into 2
and thinned down to 50 microns. I have not verified this, but it would be
my guess.

The comparison with E6 would be that the E6 single-crystal plates are
single-zone, similar nitrogen impurity concentrations. The cvd diamonds
have no inclusions so some of these specs are apples-to-oranges comparison.
This would need to be verified, but my recollection is that the plastic
deformation in the HPHT type IIa material can be a good deal lower than
what we have seen in this last batch of CVD material from E6. I would say
the multi-zone samples have a low probability of being good enough for use
as radiators, but the single-zone samples have a high probability, higher
than this E6 cvd diamond plate material based on this latest batch. On the
other hand, it is a good deal more expensive.

-Richard Jones
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