Hi Anita,
what I do in pathological cases is
synchrotron
postref beam 0 usebeam off
I think usebeam off is not necessary. Like that the mosaicity is not refined at
all. I think that's the only way.
cheers,
jens
Anita Bentley wrote:
> Dear MOSFLM specialists,
>
> I am trying to treat rather difficult datasets from split (multiple)
> crystals and MOSFLM (version 6.2.4) seems to manage quite well. I do
> have a problem, however, in handling the mosaicity: I am quite certain
> that the intrinsic mosaic spread is pretty low, but when spots from the
> multiple lattices overlap, the refined value goes up.
>
> I would therefore like to fix the value of mosaicity during integration,
> having refined it carefully on selected frames. What is the appropriate
> key-word? I'm afraid I find the text in the present manual rather confusing:
>
>
> "The crystal mosaic spread is also refined by default, but the refined
> value IS NOT USED BY DEFAULT. This is because if the refinement is
> unstable, this can have rather drastic effects on the processing. If the
> refinement is stable, and there is evidence for a change in mosaic
> spread during the run (this often results from radiation damage), the
> refined values should be used by including the subkeyword USEBEAM:
>
> POSTREF USEBEAM
>
> This is the default from MOSFLM version 6.2.3."
>
>
> What is the default setting in MOSFLM?
>
> What is the keyword that stops the osaic spread from refining?
>
> Thanks for any good idea!
>
> Anita
>
>
> Anita Lewit-Bentley
>
> LBPA
>
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>
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