logging in or signing up LBC BlueObserving Malbern Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 66 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: September 18, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript LBC-Blue pre-commissioning : LBC-Blue pre-commissioning LBC-Blue E Giallongo (PI) Rome: diPaola, Pedichini, Speziali, Testa, Gallozzi Arcetri/Padova/Bologna: Ragazzoni (co-PI), Barufollo, Diolaiti Trieste: Smareglia, Gasparo field of view, filters taking data: preparing andamp; executing the observations Two pre-commissioning runs this year: Summer (May – mid-July) Fall (mid-Sept to present) leading up to LBC-Blue commissioning late October Opto-mechanical Design : Opto-mechanical Design LBC-Blue: focal plane: LBC-Blue: focal plane 4 2048 x 4608 pix ‘science’ chips 0.23'/pxl (7.85’ x 17.7’ per chip) separated by 80 pxl (18') gaps ~ 27’ x 27’ field of view 2 512 x 2048 pix ‘technical’ chips first 256 lines masked to be used without shutter (~frame transfer CCDs) fast readout: 1.2s for the 256x2048 area 1’ x 7.85’ field of view for guiding andamp; active optics all behind shutter andamp; filter from 'LBC Blue Channel: The CCD Camera' (Giallongo (PI), Speziali, diPaola, Pedichini , Ragazzoni (co-PI)andamp; LBC team) Wavelength coverage: Wavelength coverage Filters intended (8/channel at one time) LBC-Blue: Bessel U,B,V Sloan g’, r’ (u’ to be added) LBC-Red: Bessel V, R, mod-I Sloan r’,z’ (i’ to be added) NB 910nm/30nm fwhm (under consideration) Sensitivities ETC gives 5s-1hr for 0.9' seeing, 1.8' SW aperture, no moon, airmass = 1.3: B~27.1, U~25.4, V~26.9 First light image at B consistent with estimate from ETC. Estimates only! to be measured during commissioning… Preparing Observing Blocks: Preparing Observing Blocks OB tool runs on Linux andamp; Windows (Gallozzi) set pointing, position angle configure Blue andamp; Red channel: dither pattern, exposure time, Nexp Writes out xml file Executing Observing Blocks: Executing Observing Blocks LBC Control SW: Runs from firefox browser Uploads OB Executes observation Interfaces with TCS: slews, obtains rotator trajectory, dithers Guiding for exposures longer than a given threshold (~30sec) Technical chip exposures 2,4,8,…sec taken Automatically searched for stars; when sufficient stars found, starts guiding Focus & Collimation: Focus andamp; Collimation Slew to target Execute OB to move M1 down by 0.8mm (60pxl pupil) Obtain 15-20s image using a ~1000 line window of chip 2 Analyze with IDL algorithm (Barufollo andamp; Ragazzoni): Automatically finds bright isolated pupils computes Zernike coefficients sends the results to the TCS/PSF which adjusts mirror position andamp; forces 2-3 iterations to achieve focus andamp; collimation Frequency of focus/collimation? TBD, depends on accuracy of collimation lookup table Summer (May to mid-July) pre-commissioning : Summer (May to mid-July) pre-commissioning CCD Controllers (Pedichini, Skytech) Returned from Rome/Skytech Source of pickup noise tracked down and eliminated Decreased image transfer time (diPaola andamp; Smareglia) 105s total: 26 s readout (41 s readout andamp; demultiplexing) transfer from LBC CMU to archive and from LBC archive to user machine Development of single extra-focal image analysis algorithm (Barufollo andamp; Ragazzoni) MAT (4' rms) and LBC (7.6' rms) pointing models First collimation lookup table made Mirror position (x,y,z,rx,ry) vs elevation for about a dozen datapoints. Outstanding Issues in mid-July: rotator cable chain buckling Focal plane tilt (100 microns) which had existed since fall 2005. Fall (Sept – late Oct) pre-commissioning : Fall (Sept – late Oct) pre-commissioning New rotator cable chain installed Fixed focal plane tilt Shimmed rotator flange by 0.38mm Guiding works Tasks for the next two weekends: Refinement of collimation lookup table Refinement of pointing models (MAT and LBC) Refinement of active optics code (Oct 19-22) LBC-Blue Commissioning to begin October 23 Quantum Efficiencies: Quantum Efficiencies from Pedichini F., Speziali, R., Diolaiti, E., Ragazzoni, R. 2002, 'The Large Binocular Camera of LBT: The focal plane detectors', http://lbc.mporzio.astro.it/Documentation/The_Detectors.pdf (in later document, one blue chip differs; QE for this one 1-8% lower but similar shape) You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
LBC BlueObserving Malbern Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 66 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: September 18, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript LBC-Blue pre-commissioning : LBC-Blue pre-commissioning LBC-Blue E Giallongo (PI) Rome: diPaola, Pedichini, Speziali, Testa, Gallozzi Arcetri/Padova/Bologna: Ragazzoni (co-PI), Barufollo, Diolaiti Trieste: Smareglia, Gasparo field of view, filters taking data: preparing andamp; executing the observations Two pre-commissioning runs this year: Summer (May – mid-July) Fall (mid-Sept to present) leading up to LBC-Blue commissioning late October Opto-mechanical Design : Opto-mechanical Design LBC-Blue: focal plane: LBC-Blue: focal plane 4 2048 x 4608 pix ‘science’ chips 0.23'/pxl (7.85’ x 17.7’ per chip) separated by 80 pxl (18') gaps ~ 27’ x 27’ field of view 2 512 x 2048 pix ‘technical’ chips first 256 lines masked to be used without shutter (~frame transfer CCDs) fast readout: 1.2s for the 256x2048 area 1’ x 7.85’ field of view for guiding andamp; active optics all behind shutter andamp; filter from 'LBC Blue Channel: The CCD Camera' (Giallongo (PI), Speziali, diPaola, Pedichini , Ragazzoni (co-PI)andamp; LBC team) Wavelength coverage: Wavelength coverage Filters intended (8/channel at one time) LBC-Blue: Bessel U,B,V Sloan g’, r’ (u’ to be added) LBC-Red: Bessel V, R, mod-I Sloan r’,z’ (i’ to be added) NB 910nm/30nm fwhm (under consideration) Sensitivities ETC gives 5s-1hr for 0.9' seeing, 1.8' SW aperture, no moon, airmass = 1.3: B~27.1, U~25.4, V~26.9 First light image at B consistent with estimate from ETC. Estimates only! to be measured during commissioning… Preparing Observing Blocks: Preparing Observing Blocks OB tool runs on Linux andamp; Windows (Gallozzi) set pointing, position angle configure Blue andamp; Red channel: dither pattern, exposure time, Nexp Writes out xml file Executing Observing Blocks: Executing Observing Blocks LBC Control SW: Runs from firefox browser Uploads OB Executes observation Interfaces with TCS: slews, obtains rotator trajectory, dithers Guiding for exposures longer than a given threshold (~30sec) Technical chip exposures 2,4,8,…sec taken Automatically searched for stars; when sufficient stars found, starts guiding Focus & Collimation: Focus andamp; Collimation Slew to target Execute OB to move M1 down by 0.8mm (60pxl pupil) Obtain 15-20s image using a ~1000 line window of chip 2 Analyze with IDL algorithm (Barufollo andamp; Ragazzoni): Automatically finds bright isolated pupils computes Zernike coefficients sends the results to the TCS/PSF which adjusts mirror position andamp; forces 2-3 iterations to achieve focus andamp; collimation Frequency of focus/collimation? TBD, depends on accuracy of collimation lookup table Summer (May to mid-July) pre-commissioning : Summer (May to mid-July) pre-commissioning CCD Controllers (Pedichini, Skytech) Returned from Rome/Skytech Source of pickup noise tracked down and eliminated Decreased image transfer time (diPaola andamp; Smareglia) 105s total: 26 s readout (41 s readout andamp; demultiplexing) transfer from LBC CMU to archive and from LBC archive to user machine Development of single extra-focal image analysis algorithm (Barufollo andamp; Ragazzoni) MAT (4' rms) and LBC (7.6' rms) pointing models First collimation lookup table made Mirror position (x,y,z,rx,ry) vs elevation for about a dozen datapoints. Outstanding Issues in mid-July: rotator cable chain buckling Focal plane tilt (100 microns) which had existed since fall 2005. Fall (Sept – late Oct) pre-commissioning : Fall (Sept – late Oct) pre-commissioning New rotator cable chain installed Fixed focal plane tilt Shimmed rotator flange by 0.38mm Guiding works Tasks for the next two weekends: Refinement of collimation lookup table Refinement of pointing models (MAT and LBC) Refinement of active optics code (Oct 19-22) LBC-Blue Commissioning to begin October 23 Quantum Efficiencies: Quantum Efficiencies from Pedichini F., Speziali, R., Diolaiti, E., Ragazzoni, R. 2002, 'The Large Binocular Camera of LBT: The focal plane detectors', http://lbc.mporzio.astro.it/Documentation/The_Detectors.pdf (in later document, one blue chip differs; QE for this one 1-8% lower but similar shape)