[esa-t474] Resubmission

[Alexey Lyapin]

Dear All,

I'm attaching the revised version of the paper along with the referee's 
report and replies that I've just submitted. Sorry, I did not circulate 
them before the submission, but I had to meet the deadline... Hope that 
the added/edited bits don't look too raw!

Merry Christmas and a Happy New Year to all of you!

Best festival wishes,
Alexey
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1. Page 3. A plot of dispersion function in Fig. 1 may be quite informative.

Added an optics calculation plot

2. Page 4. A sketch of the cavity BPMs can be a good illustration of the
BPM description.

Added some photographs.

3. Page 4. Use of a NMR-based feedback for automatic control of the magnet
power supply can help to stabilyze the magnetic field. Was such possibility
considered?

We did not consider that -- thanks! A feedback could indeed reduce the drifts, although the fast fluctuations would still go through uncorrected. Added this in the suggestions section.

4. Page 5. How the matrix for SVD is obtained?

Added more details on filling the matrices and using the SVD for finding the correlation coefficients

5. Page 12. What is the characteristic time of the fast fluctuations of magnetic
field?

It is hard to say as they seem to be faster than our detector. It seems very likely that the largest contribution comes from the mains AC interference at 50/60 Hz, but this may need some further investigations.

6. Page 13. Was the parasitic vertical dispersion estimated?

No, as we have a mixture of the intrinsic cross-coupling and relative misalignemt of BPM4 in the middle of the chicane and the magnets, both would appear as the vertical dispersion.
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