1. Synthesis and status of MKI vibration studies
Jan Uythoven for the “MKI Vibration team”: S.Redaelli, M.Barnes, N.Garrel, R.Moron-Ballester, M.Guinchard, C.Derrez, C. Mitifiot, A.Masi, B.Goddard, V.Mertens
15/09/2011
LHC UFO meeting, Jan Uythoven

2. LHC UFO meeting, Jan Uythoven
MKI kickers
Four MKI tanks per beam, between Q4 and Q5, pulsed at about 50 kV
Each yoke is 2.65 m long, with a 3.0 m Al2O3 tube carrying 15 metal strips
BLMs located downstream of each tank, plus 3 between Q5 and MKI
Vacuum valves at tank ends, plus sector valves – 10 in total per beam
15/09/2011
LHC UFO meeting, Jan Uythoven

3. Vibration measurements with accelerometers
Details in edms document
Measured in the lab on outside of the MKI tank
Many issues electrical and audible noise, vibrations from pumps
The mechanical effect of the kick can be seen in the 60 to 1000 Hz frequency band
Displacement at these frequencies is only around 10nm.
Measurement
Raúl Morón Ballester, Michael Guinchard
15/09/2011
LHC UFO meeting, Jan Uythoven

4. Accelerometer - spectra
Resonances due to kick
15/09/2011
LHC UFO meeting, Jan Uythoven

5. Laser Interferometer Measurements
On outside of tank and inside, via window, on ceramic vacuum chamber
Two series of measurements
29th June – cooling pumps on - analysed
11th August – cooling pumps off – a lot better! – to be analysed
Conclusions from (inferior) first measurements:
Spectra have different frequency components depending on element being measured
When the kicker magnet pulses new characteristic frequencies appear
The ceramic chamber SEEMS to have higher amplitude peaks than the flanges
Measurements to be repeated with pumps off
Characteristic frequencies from Laser and Accelerometer measurements seem to agree
15/09/2011
LHC UFO meeting, Jan Uythoven

6. Laser measurement Ceramic chamber Flange S.Redaelli
Conclusion: Need to analyse data with cooling pumps off!
15/09/2011
LHC UFO meeting, Jan Uythoven