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

[s henderson]

Choosing between rotating anodes and sealed sources:

the issues of beam stability and power consumption are minor issues
in this regard.  It sounds like you are building your own from
components.

1.  the main plus for RA's is high flux for a given brightness.

2.  stability of RA's is not bad - a beam monitor, or other methods
    can compensate here.

3.  running costs (electricity) are higher, but maintenance costs
    are a much bigger issue here.  Consumables and breakdown costs
    are major items.  The engineering on RA's could be improved a LOT,
    but they are what they are. 

4.  the capital cost difference, excluding microsources, is about 4x

5.  commercial companies (Rigaku, etc) offer all three choices:  RA,
    std sealed sources, microsources and can give you relative
    performances.

6.  there is no real substitute for checking actual performance
    yourself.  Try and visit somewhere that has what you want to buy
    and use it before using funds.

Stephen Henderson

--- On Sun, 5/22/11, Dr. Dillip Kumar Bisoyi <dkbisoyi at nitrkl.ac.in> wrote:

> From: Dr. Dillip Kumar Bisoyi <dkbisoyi at nitrkl.ac.in>
> Subject: Re: [SA_scat] about RAT and Fixed tube x-ray generator
> To: "Discussion list for the Small-Angle Scattering community" <sa_scat at iucr.org>
> Date: Sunday, May 22, 2011, 9:54 PM
> 
> 
> Dear Dr Suresh,
>  In my view fixed tube x-ray generator is best
> for stability and high resolution.
> Thanking you.
> > 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 
> >
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