Agoo,
The line focus beam comes out of two opposing windows on the X ray tube, and the spot focus beam comes out of the other two windows, perpendicular to the line focus beams. The tube will fit in the tube housing only one way--suitable for your instrument-- unless your generator has a way to rotate the tube housing to use the spot focus beam. The old Philips generators had the tube in a tower extending above a table top on which goniometers using the line focus were mounted and cameras using the spot focus were also mounted, but perpendicular to the line focus beams.
The tubes I use have a line drawn on the metal base to indicate the orientation of the line focus.
Jim
Professor Emeritus, Geochemistry & Mineralogy
University of Missouri-Kansas City
KC, MO, USA
Sent from my iPad
J Murowchick
> On Sep 8, 2019, at 11:40 PM, Agoo <[log in to unmask]> wrote:
>
> How to find which window is line focus and which is point focus in the XRD x-ray tubes? Is there any standard method of identification?
> Since water in and out is fixed in the tube housing and since there is a guide pin prevents the tube from installing which ever window you want how it is possible to install the same tube from point focus to line focus?
>
> Regards
> Agoo Seventapegi, Ph.D.
> Engineering Department
> University of Zimbabwe
> P. O. Box MP 203
> Mount Pleasant, Harare
> Tel: +263-04-333407
>
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