[Clas12_rich] RICH Mirror C3 corners not in same plane

[Marco Mirazita]

Hi Tyler,
as Sandro said, the four corners of one face of the mirror are 4 points 
on a sphere, thus they may or may not be planar, depending on how the 
mirror has been cut.
Instead, the lateral cuts of the mirrors are made by planes, thus the 4 
corners on each side have to be planar. This is what I checked.
Marco



Il 2016-08-03 23:22 Tyler Lemon ha scritto:
> Dear Marco Mirazita,
> 
> We have been looking at mirror C3 and are still having problems with
> the corners of the ideal model being non-coplanar. We have looked at
> the data in NX 9 and AutoCAD and in both we see one corner not lying
> in the plane created by the other three. Attached is an image
> generated in NX 9 showing this. The plane was created using corners A,
> B, and C and you can see corner D is above the plane. We see a similar
> thing in AutoCAD.
> 
> I have also taken your advice in the email from this morning and
> checked the cross product of the two diagonals with each side. From
> this, we do not get that the corners of mirrors C3 and C4 are
> coplanar. However, we do see that mirrors C2 and C5 have coplanar
> corners. We are very puzzled by this. Do you have any idea why this
> is? The only thing that we can think of is that the step models for C3
> and C4 are somehow incorrect when we import them. Could you please
> send us the raw model files and also just the coordinates for the
> corners that you used for your calculations? Thank you in advance.
> 
> Also, by the way, I sent an email to Walt Akers today to ask of any
> progress on the space layout of EEL 124 to ensure that there will be
> adequate space for the RICH assembly and testing. I will send his
> reply and the model for the area with the mailing list when I get it.
> 
> Best regards,
> 
> Tyler
> 
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