Synchrotron Radiation Units: Photons/s/mrad^2/1%BW

[rockingroli]

Hi

I have a question about the common unit for the intensity of a synchrotron X-Ray spectrum:

$$\frac{Photons}{sec*mrad^{2}*0.1\%BW}$$

I am not sure how to interpret the 0.1%BW.

How do I get the numbers of Photons/sec/mrad2 in an Energy range lets
say from energy $$E_1$$ to energy $$E_2$$ ?

I really need to know this !

Thank you for any help

Roland

 

[Astronuc]

I believe 0.1%BW indicates bandwidth, which seems to be verified by

http://www.research.ibm.com/journal/rd/444/jordansweet.html - see end of paragraph 3

Second-generation synchrotrons have been upgraded with insertion devices where possible, and are testing grounds for new designs. Currently, second-generation rings produce a maximum brightness of ~10¹⁴ photons/s/0.1%bw/mm²/mrad². (Brightness is a combination of flux, source size, and beam divergence. It is given in units of number of photons per second in a certain energy bandwidth, divided by source area and by the solid angle of the radiation cone.)

 

[zegris]

Let's consider this example: I've got the flux from undulator at some point, say 10^9 photons/s at 3 keV. What is 0.1%bw in this case?

 

[zegris]

I've got the answer:
0.1%bw = 0.001