MSCwinter, short-term schedule

Commissioning meetingCascina 2 Oct 2006

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MSC “activities” are:

- Inertial damping- Local control- Tide control- Locking re-allocation to marionette- F7 control- Vertical control

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The “objects” that allow these activities are:

- SA-Suspension mechanics (ground-F7)- LastStage-Suspension Mechanics (F7-Mirror)- STD digital control electronics- STD analogic crate (actuation driving)- STD SA-suspension sensors/actuators- F7-ground sensors/actuators - STD local control sensors/actuators- STD interface with GC - SW to deal with all the systems above….

Maintenance and performance (awards!) of each item used by MSC concern object responsible/developer.

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Virgo sensitivity (at LF !) Virgo duty-cycle

MSC is the direct product of the work done by each responsible of any object or activity. MSC people are involved to efficiently contribute to the achievement of two main tasks:

Serial Links (WI-NI-PR) Gennai et El. OKF7-drivers (BS) “ “ OKF7-control implementation (BS) Dattilo et Al. ~ OKUPS Start/Stop sequence monitor Frasconi, + El. crew OKNE-WE-BS drivers LP-analog filter Gennai et El. OKWI-NI drivers LP-analog filter Gennai et El. ~OKWI,NI switch with auto re-scaling G Ruggi OKWI,NI temporary probes LR RM Ruggi OKDAQ-load-ID Gennai Ruggi OKPR-craddle-correction-check Ruggi OKPR-IDErrReconstr Ruggi OKPR-LC_OptLev-Diag MajoRuggi OKEDSPClient update 9Tow Gennai Ruggi OKNew motor Client in Supervisor Ballardin Ruggi OKMeasurement of all driving matrixes(but MC) and DC resetting for IP

Ruggi OK

fixed a problem with one slide stuck(BS)

Ruggi-Frasconi OK

~ 10 people

Example, last week:

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seism VS tilt

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seism (300-600) mHz:

relevant LVDTs seismic component in ID, blending must be accurate;

=> better lowering Acc/Pos cross-over frequency.

30 mHz crossover N-arm70 mHz crossover W-arm

cavities locked independently (correction signals)

As expected Next slideNote: seism produces excitation of

payload pitch and yaw (x,z ). Notches implemented to reduce it.

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Tilt (f< 100 mHz): - wind speed || LVDT_rms increase (observation);

- tilt causes fake acceleration (Losurdo, Passuello, Ruggi);

=> ID causes LVDT_rms increase through in-loop accel. signal.

wind speed

susp displacement X crossover f = 30 mHz; Z crossover f = 50 mHz

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SUSPENSION (IC=Improved Corrector since last run, IE=ImprovedError signal since last run, T=tidal control)

X (blendingF) Z (blendingF) Ty (blendingF) F7 Y

IB 30 mHz 30 mHz 70 mHz 0 ON

MC 70 mHz 70 mHz 70 mHz 0 0

PR 50 mHz * 50 mHz * 70 mHz 0 0

BS 30 mHz 50 mHz,T 70 mHz 0 0

NI 30 mHz 50 mHz 70 mHz 0 0

NE 30 mHz 50 mHz,T 70 mHz ON 0

WI 30 mHz 50 mHz 70 mHz 0 0

WE 30 mHz 50 mHz,T 70 mHz ON 0

OB 70 mHz 70 mHz 70 mHz 0 0

From the WSR2 run summary http://wwwcascina.virgo.infn.it/commissioning/WSR2//WSR2_InvestigationsDocuments/

Actual configuration arisen through trials and tests during shortperiods of bad weather. Need of experience during long runs !

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Next months (no tiltmeters)

mandatory: reduction of rms displacement of IP due to seism/tilt(Note: large force re-allocation to marionette (zMcorr) during IP oscillation is harmful, causes

payload tilts)

Difficult using only:

1) ID cross-over frequency tuning (to optimize acc/pos components)

2) notch patches (not to excite payload tilt modes)

A proposal arisen during MSC-Losurdo is to “extend and generalize” the tide control.Namely, it means to use mirror level signals derived from the ITF signal to keep IP position instead of LVDT (once locked, science mode etc…).

A third handle…

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Question marks (several, at least two):- reduction by a factor ~100 in IP rms is enough to ensure decoupling from seism increase ?- how to deal with x IP d.o.f. (no global signal)?

“extended and generalized tide control” (global IP control?)

seism attenuated at the mirror level by HTF (~0.1 @ 100 mHz)

higher IDz cross-over freq. (lesser seism re-injection without LVDT) lesser tilt re-injection through accelerometers.

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Readout upgrade & microseism

Causes a roll about zRoll motionread-out as yaw y

10o Motion along x

A remarkably useful mistake in optical lever design

To the top stage x?

Flt

Roll notched in y LC

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“global IP control” schedule

Step 2) IP control using mirror sensing signal: preliminary test by means of z LC signal, done.

Step 1) position control of 4 IPs using standard narrow bandwidth: PR ready to be tested.

Step 3) study and test of suitable filters to swap LVDT/mirror-sensing.

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Locking force re-allocation

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Marionette re-allocationPR, (blendingF) BS (blendingF) NE (blendingF) WE (blendingF)

0 0 ON, 8 Hz ON, 8 Hz

From the WSR2 run summary http://wwwcascina.virgo.infn.it/commissioning/WSR2//WSR2_InvestigationsDocuments/

BS marionette re-allocation ready to be implemented.PR force re-allocation need under study.

Test with emphasis-deemphasis (further improvement by a factor 6,D. Huet’s talk).

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Further features needed to accomplish the main tasks

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F7 damping from ground:

Useful in presence of marionette lock re-allocation(actually on NE WE)and, in general, to damp SAYaw recoil.

- BS ready to be implemented- Other installations scheduled (PR,WI,NI)

SUSPENSION (IC=Improved Corrector since last run, IE=ImprovedError signal since last run, T=tidal control)

X (blendingF) Z (blendingF) Ty (blendingF)F7 Y

IB 30 mHz 30 mHz 70 mHz0 ON

MC 70 mHz 70 mHz 70 mHz0 0

PR 30 mHz 50 mHz 70 mHz0 0

BS 30 mHz 50 mHz,T 70 mHz0 0

NI 30 mHz 50 mHz 70 mHz0 0

NE 30 mHz 50 mHz,T 70 mHzON 0

WI 30 mHz 50 mHz 70 mHz0 0

WE 30 mHz 50 mHz,T 70 mHzON 0

OB 70 mHz 70 mHz 70 mHz0 0

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Vertical damping:

Vertical seismic excitation is coupled with payload tilts (x,z ),critical in the range 0.4-0.8 Hz. A campaign of tests using the ITF has to be scheduled to better asses the need and specifications of vertical damping.

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Interface with Alignment:

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LC versus AA: Actual and near-future setup

Local controls (IC=Improved Corrector since last run,RO=aggressive roll-off, IE=Improved Error signal since last run)

Tx Ty Tz X Z RM(tx,ty,z)

IB YMC YPR OFF,4 Hz OFF, 3 Hz (IC) 0 0 YBS OFF, 1 Hz (RO) ON, 2 Hz (RO) 0 0 YNI ON, 3 Hz (IC) ON, 2 Hz (RO) 0 0 YNE OFF, 4 Hz ON, 3 Hz (IC) 0 0 YWI ON, 3 Hz (IC) ON, 3 Hz (IC) 0 0 YWE OFF, 4 Hz OFF, 3 Hz (IC) 0 0 Y

OB Y

Automatic alignment (LA=linear alignment, DrCo=drift control,IC=Improved Corrector since last run)

Tx Ty Tz Z RM(tx,ty,z)

IB LA LA LA LA (0,0,0)MC LA LA 0 (0,0,0)BM DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)PR LA,(0.5-3 Hz) LA, (0.5 – 3Hz) (IC) 0 0 (0,0,0)BS LA, (0.5-3 Hz) (RO) DrCo (~10 mHz) 0 0 (LA,0,0)NI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)NE LA, (0.5-3 Hz) DC

+AC error signalDrCo (~10 mHz)DC error signal

0 0 (0,0,0)

WI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)WE LA (0.5-3 Hz)

DC+AC error signalLA (0.5-3 Hz) ACerror signal

0 0 (0,0,0)

WSR1

- Steep noise re-injection roll-off tested at NI LC y WI-C7-like x on both WI and NI- Overall improvement on both LC and AA for all-but-NI y.

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LC versus AA: Actual and near-future setup

Local controls (IC=Improved Corrector since last run,RO=aggressive roll-off, IE=Improved Error signal since last run)

Tx Ty Tz X Z RM(tx,ty,z)

IB YMC YPR OFF,4 Hz OFF, 3 Hz (IC) 0 0 YBS OFF, 1 Hz (RO) ON, 2 Hz (RO) 0 0 YNI ON, 3 Hz (IC) ON, 2 Hz (RO) 0 0 YNE OFF, 4 Hz ON, 3 Hz (IC) 0 0 YWI ON, 3 Hz (IC) ON, 2 Hz (RO) 0 0 YWE OFF, 4 Hz OFF, 3 Hz (IC) 0 0 Y

OB Y

Automatic alignment (LA=linear alignment, DrCo=drift control,IC=Improved Corrector since last run)

Tx Ty Tz Z RM(tx,ty,z)

IB LA LA LA LA (0,0,0)MC LA LA 0 (0,0,0)BM DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)PR LA,(0.5-3 Hz) LA, (0.5 – 3Hz) (IC) 0 0 (0,0,0)BS LA, (0.5-3 Hz) (RO) DrCo (~10 mHz) 0 0 (LA,0,0)NI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)NE LA, (0.5-3 Hz) DC

+AC error signalDrCo (~10 mHz)DC error signal

0 0 (0,0,0)

WI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)WE LA (0.5-3 Hz)

DC+AC error signalLA (0.5-3 Hz) ACerror signal

0 0 (0,0,0)

WSR2

short-term prospective of leaving WI,NI, BSy under LC+DrCo, aggressive roll-off also in WI

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LC versus AA: before WSR3 ?

Logbook 11:46, Tuesday 19 September 2006 (13415) IP motion during wind

Large lock correction on marionette

Driving coupling with z non-negligible

LC y mario readout coupled to z

Wrong LC driving hardly compensated by Drift Ctrl

Local controls (IC=Improved Corrector since last run,RO=aggressive roll-off, IE=Improved Error signal since last run)

Tx Ty Tz X Z RM(tx,ty,z)

IB YMC YPR OFF,4 Hz OFF, 3 Hz (IC) 0 0 YBS OFF, 1 Hz (RO) ON, 2 Hz (RO) 0 0 YNI ON, 3 Hz (IC) ON, 2 Hz (RO) 0 0 YNE OFF, 4 Hz ON, 3 Hz (IC) 0 0 YWI ON, 3 Hz (IC) ON, 3 Hz (IC) 0 0 YWE OFF, 4 Hz OFF, 3 Hz (IC) 0 0 Y

OB Y

Automatic alignment (LA=linear alignment, DrCo=drift control,IC=Improved Corrector since last run)

Tx Ty Tz Z RM(tx,ty,z)

IB LA LA LA LA (0,0,0)MC LA LA 0 (0,0,0)BM DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)PR LA,(0.5-3 Hz) LA, (0.5 – 3Hz) (IC) 0 0 (0,0,0)BS LA, (0.5-3 Hz) (RO) DrCo (~10 mHz) 0 0 (LA,0,0)NI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)NE LA, (0.5-3 Hz) DC

+AC error signalDrCo (~10 mHz)DC error signal

0 0 (0,0,0)

WI DrCo (~10 mHz) DrCo (~10 mHz) 0 0 (0,0,0)WE LA (0.5-3 Hz)

DC+AC error signalLA (0.5-3 Hz) ACerror signal

0 0 (0,0,0)

WSR1

Unlock! Full BW AA recommended on NE.

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Conclusions

-Assistance to commissioning ITF(performance monitoring and response to commissioning issues)

-Effort to develop noise budget tools within MSC

- scheduling improvements by merging commissioning requests and the expertise of suspension and LC groups.

Konogurai kakakimaska ? The time schedule has to be coordinated with AA setup completion.

Two months ?

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