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[SA_scat] about RAT and Fixed tube x-ray generator


I am interested to learn about merits and demerits of present generation 
Rotating Anode Target (RAT) x-ray generator for SAXS in transmission geometry. I 
heard that beam stability of x-rays produced by RAT is very poor  due to that it 
hampers the resolution of SAXS and it consumes huge power. 

Advances in fixed tube x-ray generators coupled with advanced x-ray mirrors 
produces high brilliance x-rays. is this flux density really comparable with 
modern RAT x-ray generators.

 With your  experience, which x-ray generator is best, RAT or fixed tube. 

With best regards and your advise is greatly acknowledged. 

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