MSC latest weeks activities V. Dattilo, A. Gennai, D. Huet, E. Majorana, F. Paoletti, D. Passuello, P. Ruggi.

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Presentation transcript:

MSC latest weeks activities V. Dattilo, A. Gennai, D. Huet, E. Majorana, F. Paoletti, D. Passuello, P. Ruggi

Latest week activities LC power supplies x-damping status Vertical damping DSP software

LC Power supplies (1/2) BeforeWI offNI offBS off Fastest solution : move away LC power supplies

LC Power supplies (2/2) WI, NI and BS LC power supplies moved closed to the ID rack WI, NI and BS light halogen bulbs replaced It would be better to do it also on NE, WE, and PR (even if no effect on the ITF was observed, expectedly the magnets are properly orientated)

x-damping status (1/2) LCoils: previous tests (30/01/07) were not conclusive because of the poor quality of the x position signal, hence: ErrSignal: calibration of a cleaner signal (as already done for BS in fall 2006) Same test performed on NE (12/03/07) with improved x position signal Goal : to have a more direct and efficient way to damp x oscillation: using lateral coils and a cleaner signal

x-damping status (2/2) Tower Improved x position Lateral coils test Status NE OKDone Not functioning, likely due to magnets WE OKTo redo ? NI To doTo redo ? WI To doTo redo ? BS OKTo do 1 coil broken PR To doTo confirm Likely OK

Vertical damping Problem : frequent aperture of vertical damping on WE and PR, by the guardians, due to the saturation of vertical accelerometers (see entry for details) Actions : performed last Friday on WE removal the DC offset on accelerometers note: systematic monitoring and readjustment campaign of of the offsets should be performed ? amplification reduction by a factor 3 Some days of observations to check the benefits before applying these modifications to vertical accelerometers of PR

DSP Software Tests of the new DSP SW were performed but there are still some spikes that confirm the previously seen problems note: however, the new DSP SW is currently in use for compiling ID cards in order to avoid numerical noise. Diego is preparing a new version with reduced numerical noise, protection against corrupted data, but DOL readout as before.

GIPC !! Paolo has implemented in-line the GIPC, tested again, successfully (entry 15713). Next actions: check of other components coupled to the  seism (short tower ID optimization suggested)