a.jeremie lavista: laboratories in annecy working on vibration stabilization some information on the...
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A.Jeremie
LAViSta: Laboratories in Annecy working on Vibration Stabilization
Some information on the Stacis 2000 Table from CERN,currently in Annecy
B.Bolzon, F.Cadoux, N.Geffroy, A.Jeremie, Y.Karyotakis
presented by P.Bambade, LAL-OrsayATF2 project meeting, KEK, May 30-June 1, 2006
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Bloc:61
Foot:26.5
Total:87.5
Length:240Width:90
Values are in cm and measured directly on the table with a tape-measure.Static load capacity per foot (there are 4) 182 kg to 500 kg. Honeycomb bloc has a weight of 731kg.
CERN Stacis 2000 table currently in Annecy, France.
A.Jeremie
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Information written on the STACIS 2000 feet we have:3 feet with max weight 544kg, and one with max weight 500kg(standard table has three feet, but one can buy with 4 feet).
Max weight 2131kg.
Honeycomb bloc weighs 731kg
Total weight capacity left:1400kg
Table weight capacityA.Jeremie
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Two setup considered for ATF2
1. Shintake monitor (BSM) on table: not really a solution
Shintake monitor: 740kgsupport: estimated at 100kgQD0: 400kgmover: estimated 25kgT-plate: 10kg
=> total Shintake + QD0 without extra BPMs: 1275kgnot enough capacity to add SD0 etc…
1. Shintake monitor on separate support: closer to ILC situation
QD0+mover+T-plate: estimated at 435kgSD0+mover+T-plate: estimated at 181kgQF1+mover+T-plate: estimated at 435kgSF1+mover+T-plate: estimated at 181kg
=>total QD0+SD0+QF1+SF1 without extra BPMs: 1232kgnot enough capacity to add OC1
From T.Sanuki U.Tokyo
Magnet information from Ch.Spencer
A.Jeremie
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Measurements with only 50 kg on the table A.Jeremie
At 10 Hz, floor has RMS of 3nmpassive table 6nmactive table 1nm
floor
passive table
floor
active table
1 Hz 10 Hz
10 Hz1 Hz
1nm
10nm
10nm
1nm Tested frequency ranges
Guralp velocity sensors: 0.2 – 50 HzENDEVCO acc. sensor: 7 – 100 Hz
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Measurements with 50 kg + 4 38.9 kg blocs centered on the table A.Jeremie
At 10 Hz, floor has RMS of 3nmpassive table 6nmactive table 1nm
Table still works with ~ 200 kg on in its middle
passive table
floor
active table
floor
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A.Jeremie
At 10 Hz, floor has RMS of 3nmpassive table 7nmactive table 1nm
Table still works with ~ 40 kg on top of each foot
Measurements with 50 kg + 4 38.9 kg blocs on top of each foot
floor
active table
passive table
floor
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Measurements with 4 x 38.9 kg blocsA.Jeremie
Some differences in transfer function arise when weights distributed differently
active table
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Comparing sensors on block and on tableA.Jeremie
•When table « passive », no difference if sensor on block or on table•Not quite understood the peak at 27Hz in the transfer function when table « active »!
passive table
active table
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Height to beam-line
In a message from Tauchi san, the beam-line is at a height of 120cm
CERN Table at Annecy
Movers
QC3 = QD0
26.5 cm
16 inches = 40.64 cm
61 cm
Total: 128.14 cm
OUPS!
A.Jeremie
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Conclusions A.Jeremie
• If Shintake Monitor on Table, can only add QD0; but what about the weight distribution ? Not really a solution• If Shintake on separate stabilization, Table can stabilize QD0,1 + SD0,1 to 1 nm at 10 Hz; Closer to ILC situation• Table still stabilizes with slightly more weight than usual, but: - transfer function depends somewhat on weight distribution• With Table, limited height for (new) magnet mover design - investigating thinner honeycomb bloc from company
Prospects
• More studies with more important weights• More checks of QD0,1 + SD0,1 placement with new layout• Slow drift < 0.1 Hz with displacement sensor (R. Sugahara)• Frequency analysis with supports + magnets in future (not easy in realistic way with only pdf files with drawings)• Could design supports for slow correction
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Comparing sensors on block and on table
active table