[esa-t474] Updates

[Mark Slater]

Dear All,

I have tried to address some of the points raised at the meeting on 
Monday. To that end, I've put some additional analysis points on my elog:

http://pcfj.hep.phy.cam.ac.uk:8080/slater/35
http://pcfj.hep.phy.cam.ac.uk:8080/slater/36

These cover the problems with BPMs 1 and 2 and the position drifts against 
time. Essentially, it looks like the scale changes in BPM 1 are also 
present in BPM 2 and these are not based on the cross-talk in this BPM. 
This therefore explains the relatively poor stability of the linked 
system. I believe this answers most of the problems that were voiced but 
do please let me know if this is not the case.

I will hopefully add another entry on SVD coefficents, etc. on Friday.

Many Thanks for all your patience!

Mark

P.S. The plots shown in the ELOG also demonstrate some additional runs for 
the long stability plots.