On Tue, 4 Apr 2000 [EMAIL PROTECTED] wrote:
> In a message dated 4/3/00 12:59:08 PM Pacific Daylight Time,
> [EMAIL PROTECTED] writes:
>
> << The maximum count was 17,500 cps and lobes were observed at about 15 cps >>
> This is actually pretty good focussing for powder diffraction application;
> the focal to satellite intensity ratio for this tube has improved by a factor
> of ~10 compared to what Bergmann reports. Question to Bergmann: With such a
> tube, would defocussing still matter?
Of course, a Siemens tube typically shows lower tube tails compared
to an AEG one. Plus, at our experience, normal focus tubes show
slightly lower tube tails compared to fine focus ones.
On the other hand, at our experience, the Z range of the tube tails
is about +-1.1mm on focus side. This is the projection of a 2cm copper
anode for 6 deg take-off-angle. As I feel, may there be some additional
cut-off of the outer part of tube tails by Keith Bowens experiment?
Assuming such, both Keith Bowens and our experiments are in agreement.
Siemens tubes are of a factor 3 better than AEG ones. Our tube tails
extension is 2.5 times wider than Keith Bowen reports. Plus normal focus
tubes are slightly better than fine focus ones. This gives a factor of 10.
J"org Bergmann, Dresden
[EMAIL PROTECTED]
