LBT AO progress report meeting – Firenze, 21-24 Feb 2005 A. Riccardi: LBT672 1 LBT672: Arcetri...

LBT AO progress report meeting – Firenze, 21-24 Feb 2005 A. Riccardi: LBT672 1

LBT672:Arcetri progress report

A. Riccardi, M. Xompero, D. Zanotti, A. Puglisi, C. del Vecchio, P. Ranfagni, P.

Stefanini


Overview

• Sketch of LBT672 connections• Arcetri activities and people• P45 work progress• Progress of AdSec-related SW

development• Arcetri optical test facility progress• Schedule


AUXILIARY BATTERY 6U

POWER SUPPLY 9U

HEXAPOD CONTROLELECTRONICS 6U

3U

3U

ETHERNET SWITCH 2U

FIELD I/O 3U

GENERAL SWITCH 3U

HEXAPOD CABLES

HEXAPOD CABLES

FREE

42U

spider-armrack

Tel. p

ow

er

LBT672 with 1st light AO

TCS

AO Supervisor

TCS

BCU of W-unit

LBT672BCUs+PB

Hexapod

RT commConf/diag commPower Lines

LBT AO progress report meeting – Firenze, 21-24 Feb 2005 A. Riccardi: LBT672 4Tel. p

ow

er

LBT672 with multiple AO sys

AUXILIARY BATTERY 6U

POWER SUPPLY 9U

HEXAPOD CONTROLELECTRONICS 6U

3U

3U

ETHERNET SWITCH 2U

FIELD I/O 3U

GENERAL SWITCH 3U

HEXAPOD CABLES

HEXAPOD CABLES

FREE

42U

TCS

AO Supervisor

TCS

BCU of W-unit

spider-armrack

LBT672BCUs+PB

Hexapod

BCU of LBTI

BCU of NIRVANA

AO-selector BCUon elev. platform


LBT672 & Arcetri Activities• AdSec contractual activities (contract#AO104)

– A1) Development and test of proto and final units– A2) Numerical simulations (Shell FEA)– A3) Software development (configuration,

characterization and diagnostic)– A4) Metrology and test equipment (Shell flattening)– A5) Closed-loop test (Arcetri Test Tower)– A6) Mountain integration and test– A7) Commissioning on the telescope

• People:– A. Riccardi (system, SW, test)– M. Xompero, D. Zanotti (SW, test)– A. Puglisi (interface to AO supervisor)– X. Xxxxx (Diagnostic data SW) (15/03/2005)– P. Ranfagni (Test equipment)– C. Del Vecchio (FEA)– P. Stefanini (Mechanical components)


A1: test of P45 in ArcetriP45 + MMT crate-electronics (till mid May 2004)

Noise test of new capsens (typical 1.7nm rms @ 40m gap)Flattening of P45 shell (14nm rms, 3% extra power)Test of digital damping concept (0.7ms settling @ 68m gap)Flattening with bias magnets (17nm rms)


A1: test of P45 in ArcetriP45 + LBT crate-electronics (from mid May 2004)

+ Power Backplain

Noise with large spectral features and crosstalk with coil

Large noise due to crosstalk with new switching power supplies

Most of the Microgate (hardware) and Arcetri (software) effort for noise analysis and optimization in order to freeze asap final electronic layout

• reorganization of ground connections• optimization of ADC, DAC and capsens sample-hold timing• optimization of analog filters including anti-aliasing• optimization of current driver response


A1: test of P45 in Arcetri

Optimized P45+final crate electronics: early Feb 2005

flat noise spectrumtypical noise 1.3nm rms @ 40m gap (old crates: 1.7nm rms)typical noise 3.5nm rms @ 68m gapstep response with 0.55-0.65ms settling time @ 68m gapchopping of ±70m (±7arcsec) @ 128m gap (to be optimized)

Electronics definitively frozen and sent to production


A3: LBT672 SW development

AO supervisor

RT diagnostics

BCU of W-unit

RT DSPsoftware

RT reconstructorProvided by MG, currentlyunder debugging in Arcetriwith P45+W-BCU:• modal recontructor • modal filtering• actuator command conv.• FF computation wrt caps pos• Ctrl current integration

limits for:• Mode coeffs and coeffs• capsens pos• act cmd• act force• FF force1st implementation: if out of limits skip the actual frame,keep the old data and increase a counter for slow diagnosticsFuture implementation: keep the old value for data out oflimits, use the new data for others

Limits computedby FEA of stress by C. del Vecchio(stress inf. Functions, on progress)


A3: LBT672 SW development

AO supervisor

AdsecConfiguration SW

(IDL)

AdsecDiagnostic SW

(C,C++)

AdsecCalibration SW

(IDL)

BCU of W-unit

RT DSPsoftware

FF matrix (done and tested)Flattening (need opt for 672)Optical Interaction matrix(to be written)

1sec sampling data:• Temperatures• Voltages• Coil damages10ms sampling data:• capsens positions• actuator currents• RT fault detection

Dow

nlo

ad d

ata

done

Handlin

g a

nd p

ost

pro

cess

tbw

Configuration files (txt,fits) forany configurable parameter:• ref square wave• ctrl filter coeffs• coil efficiency• ff matrix• ecc (about 30 files, actually)


A4+5: Optical tests

Main target:Test and characterization of the

Optical Closed Loop for the Complete and Final AO System

before 1st light

Adaptive Secondary Tests:•Optical Flattening and calibration•Optical behavior at “mountain” ambient temperature•Dynamical Behavior at “mountain” atmospheric pressureWFS Optical Test:•Optical interaction with LBT672•Optical Closed loop operation


A4+5: Optical tests

F2

F1

F/15.0

F/1.221

37

13

mm

10

64

.7m

m

911mm

Lab

Winch


A4+5: Optical tests

Delay in the ref-optics holder(not yet designed)

Ref-optics alreadydelivered. Currentlyunder assembling inArcetri (P. Stefanini)

3cm

2cm


Solved critical issues• Hardware of new crate electronics (including

Power BP) has been debugged and optimized

• Suitable grounding connections have been determined

• Bias magnets have been implemented and tested

• Digital damping has been successfully tested– AO at large gap (less sensitivity to

contamination)– Chopping (to be optimized, see Xompero talk)

• Optical test tower has been erected and is mechanically and thermally stable


Work to do for LBT672• Test of multiple crate behavior on P45• Complete the diagnostic software• Optical closed loop of P45+W for software

and hardware validation at system level• Detailed definitions of operative modes

es. chopping mode: who provide sync, how?es. offloading of static aberrations

• Detailed definition of mountain operations:Accessibility to secondary locationTelescope facilities (semi-clean room with electric lines, cooling lines for Adsec test and maintenance)Optical alignment procedureCommissioning: detailed sequence of operations


Schedule


The end

LBT AO progress report meeting – Firenze, 21-24 Feb 2005 A. Riccardi: LBT672 1 LBT672: Arcetri...

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