[Olympus] Orbit stability

[Brinker, Frank]

Dear colleagues,
There was the question what one could expect as the beam stability
during Olympus measurement times.
I attached three files:

BPMsVert... Is a plot of the vertical beam position at 3 positions over
one day. 
BPMsHor...  The same for the horizontal

Here you see the saw tooth from the different fillings ( they where
rather frequent in this time, since it was a bake out time - Olympus
runs with their short lifetime will have even shorter runs )
The orbit deviations are about 100um peak-peak with one exception, the
Monitor SR16 vertical. This is a point which is kept specifically stable
by the orbit feedback - I think this should be possible at Olympus too.


BeamOscillation is a screen shot which shows fast oscillations - in time
domain on the top right and the spectra up to 120 Hz below.
The size of the oscillations is about 20um p-p. The frequencies are up
to 15 Hz due to mechanical vibrations and 50/100 Hz from electric power.


What happens from time to time are instabilities which result in fast (
~40kHz ) oscillation of up to 1mm amplitude p-p. We have to learn to
avoid them in the forthcoming machine studies.

Best regards
Frank Brinker

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