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

Dear Suresh,

Both sealed tube and rotating anode systems are amenable to transmission geometry experiments and both technologies provide a stable and reliable X-ray beam. Where the systems differ most is with regard to their maintenance requirements and their performance (and hence the amount of time required to complete an experiment). Sealed tube systems require less maintenance compared to rotating anodes and therefore are cheaper to maintain. With regard to performance, modern rotating anode systems will provide higher flux density than sealed tube systems. It's true that availability of micro-focus sealed tube systems and modern X-ray optics have revolutionized the capabilities of sealed tube systems however rotating anodes have also advanced such that the the achievable flux density of today's rotating anode generator will consistently be higher.

In addition to the X-ray source, some other considerations for a scattering system should include the type of collimation, detector type and sample handling. Each of these will have a bearing on how effective the system will be for the type of experiment you want to do.

Hope that helps,

Angela R. Criswell, Ph. D.
VP, Life Sciences
Rigaku Americas Corporation
9009 New Trails Drive
The Woodlands, TX 77381 USA
Ph: +1 281 362 2300  ext. 216
Fax: +1 281 364 3628
Email: angela.criswell@rigaku.com
URL: http://www.rigaku.com

On May 22, 2011, at 6:21 AM, koppoju suresh wrote:

> Hi, 
> 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. 
> Suresh
> _______________________________________________
> sa_scat mailing list
> sa_scat@iucr.org
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