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Robert Stobie Prime Focus Imaging Spectrograph Status

Robert Stobie Prime Focus Imaging Spectrograph Status. Reassembly and retesting in Cape Town Estimated CTC $343,000 (7.3%) over PDR cap Delivered to Sutherland 30 Sept Installed on telescope 10 October Commissioning delayed by telescope readiness. RSS/ PFIS Progress. In Cape Town

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Robert Stobie Prime Focus Imaging Spectrograph Status

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  1. Robert StobiePrime Focus Imaging SpectrographStatus • Reassembly and retesting in Cape Town • Estimated CTC $343,000 (7.3%) over PDR cap • Delivered to Sutherland 30 Sept • Installed on telescope 10 October • Commissioning delayed by telescope readiness SSWG

  2. RSS/ PFIS Progress • In Cape Town • Polarimetric optics received and tested • Flexure retest. Improved to ~50% above spec. Await telescope test to see if more improvement warranted • Fitted and aligned guider • Slitmask cutter brought up to spec; training performed • Etalons tested and calibrated • Detector baffling improved • Electronics box packaging/ glycol testing • Pre-Ship Acceptance Test Review SSWG

  3. Shipping • Shipped to Sutherland Sept 29/30 • In SALT spectrometer room • Short (control system) and long (optics integrity) form tests • Baffling closeouts • Cabling closeouts • Lift preparations SSWG

  4. Lift • Lifted onto telescope 11 Oct SSWG

  5. Installation • Alignment measured using SAC and RSS reference mirrors. Tip/ tilt in spec. • Focus measured using guider and SALTICAM. Close. Nominal shims installed • Cabling, detector cooling, glycol, air hookups • Top Hex igloo (Elvis II) lifted and cabled for etalons • First "old photons" 20 Oct. • 20 Oct: Plate scale 224.1 micron/arcsec; FWHM ~3" • 30 Oct: Plate scale 222.6 micron/arcsec; FWHM 2.2" (1.5" seeing) • Imaging limited by telescope (verified on SALTICAM) • High-Level SALT-style control GUI installed • First focus run with cal system 20051105; verify optics integrity SSWG

  6. Best Image so Far.. 47 Tuc 5 secs 630 nm IF SSWG

  7. Problems/ Open Items • Control System • articulation runaway. Solved? Will install safety strap • grating magazine sensor replacement. Done • waveplate encoders not homing • noise preventing stable etalon controller lock • occasional detector noise • Mechanical • beamsplitter holder still in manufacture • Software • TCS communications • magazine mapping layer • FITS keywords • turned over to Anthony Koeslag • Telescope • poor IQ, lack of cal system limiting RSS activities SSWG

  8. Budget SSWG

  9. Budget: Cost-to-Completion • increase ~190K from last meeting • remaining budget deltas: commissioning completion SSWG

  10. Budget: Deltas • Deltas (since last meeting) Tot Over Cap • salaries $7K • Capital + Subcontract overruns $52K • RU Travel & Shipping $6K • UW Schedule stretch July -Oct $115K • RU Commissioning increases $16K Total $190K $343K (7.3%) • Expected • Schedule stretch Nov-Dec $30K • Resale of CaF2 spares ($10K) Total $20K • Total $363K (7.7%) SSWG

  11. Commissioning; Schedule SSWG

  12. Some Commissioning and Calibration Observations Status What Type Mode D/N Source Tried Focal Plane Tilt Calibration Imaging Night Starfield Tried Center of rotation Calibration Imaging Night Starfield Tried Slitviewer focus Calibration Any Day Dome? Biases Calibration Any Cldy Night None Shutter latency Calibration Imaging Day QTH flatfield Crosstalk calibration Calibration Spec Day Neon Spectr station posn Calibration Spec Day Penrays Flexure Charact All Day Penrays Started Imaging Focus: > 430 nm Calibration Imaging Day QTH Imaging Efficiency/ linearity Charact Imaging Night Phot Std Fld Spec Focus Calibration Spec Day Penrays Spec Efficiency Charact Spec Night 2 flux standards Polarimetric Efficiency >500 nmCalibration Specpol Day QTH Polarimetric Efficiency <500 nmCalibration Specpol Night Blue star Polarimetric PA, efficiency Calibration Specpol Night 3 pol standards Instrumental Polarization Calibration Specpol Night 2 unpol standards SSWG

  13. Schedule Summary • Commissioning schedule issues • availability of calibration system, autoguider, moving baffle • training of PFIS SA • operational maturity. Efficiency now < 20% • integration of commissioning and remaining telescope and payload tasks • Payload commissioning • cal system • flatness, stray light issues • throughput good so far • moving baffle, pupil • SW to run cals • guider • throughput issue solved? • significant ops SW required • stray light baffling QTH flat 20051105 SSWG

  14. Handover and Commissioning • SALT currently understaffed by ~2x • Need to define/ schedule PFIS handover • After 9 Nov, only KHN and EBB available • After 13 Dec, team gone • Commissioning tasks not likely to complete • MOS spectroscopy • High speed spectroscopy • All Phase II (ie PIPT, OCS) tasks SSWG

  15. Commissioning Holdups • Suggested solution • turn over remaining tasks to SA's after acceptance • possible 2006 consulting trips by ebb, dh, khn (SALT funded) SSWG

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