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LBT672: Arcetri progress report

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

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LBT672: Arcetri progress report

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  1. LBT672:Arcetri progress report A. Riccardi, M. Xompero, D. Zanotti, A. Puglisi, C. del Vecchio, P. Ranfagni, P. Stefanini

  2. Overview • Sketch of LBT672 connections • Arcetri activities and people • P45 work progress • Progress of AdSec-related SW development • Arcetri optical test facility progress • Schedule

  3. BCU of W-unit RT comm Conf/diag comm Power Lines spider-arm rack AO Supervisor TCS LBT672 with 1st light AO Hexapod LBT672BCUs+PB TCS Tel. power

  4. AO-selector BCUon elev. platform spider-arm rack LBT672 with multiple AO sys BCU of W-unit BCU of LBTI BCU of NIRVANA AO Supervisor Hexapod LBT672BCUs+PB TCS TCS Tel. power

  5. 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)

  6. A1: test of P45 in Arcetri P45 + MMT crate-electronics (till mid May 2004) Noise test of new capsens (typical 1.7nm rms @ 40mm gap) Flattening of P45 shell (14nm rms, 3% extra power) Test of digital damping concept (0.7ms settling @ 68mm gap) Flattening with bias magnets (17nm rms)

  7. A1: test of P45 in Arcetri P45 + LBT crate-electronics (from mid May 2004) Noise with large spectral features and crosstalk with coil + Power Backplain 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

  8. A1: test of P45 in Arcetri Optimized P45+final crate electronics: early Feb 2005 flat noise spectrum typical noise 1.3nm rms @ 40mm gap (old crates: 1.7nm rms) typical noise 3.5nm rms @ 68mm gap step response with 0.55-0.65ms settling time @ 68mm gap chopping of ±70mm (±7arcsec) @ 128mm gap (to be optimized) Electronics definitively frozen and sent to production

  9. Limits computedby FEA of stress by C. del Vecchio(stress inf. Functions, on progress) A3: LBT672 SW development AO supervisor RT DSPsoftware BCU of W-unit RT reconstructor RT diagnostics • Provided 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 Dcoeffs • capsens pos • act Dcmd • act force • FF Dforce • 1st implementation: if out of limits skip the actual frame,keep the old data and increase a counter for slow diagnostics • Future implementation: keep the old value for data out oflimits, use the new data for others

  10. A3: LBT672 SW development AO supervisor RT DSPsoftware BCU of W-unit AdsecConfiguration SW (IDL) AdsecCalibration SW (IDL) Adsec Diagnostic SW (C,C++) • 1sec sampling data: • Temperatures • Voltages • Coil damages10ms sampling data: • capsens positions • actuator currents • RT fault detection • Configuration files (txt,fits) forany configurable parameter: • ref square wave • ctrl filter coeffs • coil efficiency • ff matrix • ecc (about 30 files, actually) FF matrix (done and tested) Flattening (need opt for 672) Optical Interaction matrix (to be written) Download data doneHandling and postprocess tbw

  11. A4+5: Optical tests • Adaptive Secondary Tests: • Optical Flattening and calibration • Optical behavior at “mountain” ambient temperature • Dynamical Behavior at “mountain” atmospheric pressure • WFS Optical Test: • Optical interaction with LBT672 • Optical Closed loop operation Main target: Test and characterization of the Optical Closed Loop for the Complete and Final AO System before 1st light

  12. 911mm Winch 1064.7mm F1 F/1.22 13713mm F2 F/15.0 Lab A4+5: Optical tests

  13. 3cm 2cm Ref-optics alreadydelivered. Currentlyunder assembling inArcetri (P. Stefanini) A4+5: Optical tests Delay in the ref-optics holder(not yet designed)

  14. 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

  15. 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 modeses. 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

  16. Schedule

  17. The end

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