SPACE TELESCOPE SCIENCE INSTITUTE Operated for NASA by AURA Cosmic Origins Spectrograph Status STIC 13 February 2001

STIC: COS Status - Keyes : 13 Feb 2001 Slide 2 of 21 Agenda  Overview  Instrument Activities and Status  STScI Ground System Activities – “Front-end” (Scheduling System) – “Back-end” (Pipeline, Archive)

STIC: COS Status - Keyes : 13 Feb 2001 Slide 3 of 21 COS Program  COS activities are a traditional-mode, new HST instrument development project coordinated with IDT led by PI James Green (Colorado); SI being built at BATC with the STIS NUV flight spare MAMA detector and FUV XDL detector from UC Berkeley (Sigmund).  STScI leads development of “front-end” (operations) and “back-end” (OPUS/HDA/calibration) ground system support for COS.  STScI COS project resources: 3 scientists (Keyes, McGrath, Bohlin), 7 system engineers, analysts, commanding and software developers

STIC: COS Status - Keyes : 13 Feb 2001 Slide 4 of 21 COS Design  Moderate Resolution (R~20,000) point-source spectroscopy; 0.1 arcsec pointing; 15 km/sec absolute (5 km/sec relative) radial velocity accuracy  Highest Possible Throughput  Maximize wavelength coverage per exposure  FUV: – single reflection system – large format solar-blind cross delay line (XDL) detector  NUV: – FUV concept not available (no large format detectors) – STIS flight spare MAMA with scanning system, enhance wavelength coverage through use of three camera optics

STIC: COS Status - Keyes : 13 Feb 2001 Slide 5 of 21 COS Optics  Apertures – Primary Science Aperture (PSA): 2.5 arcsec circular field stop – Bright Object Aperture (BOA): 2.5 arcsec + ND2 (100x attenuation) circular field stop – Wavelength Calibration Aperture (WCA) – Flat Field Aperture (FFA)  Optical Elements (Gratings, Mirrors) – FUV: G130M, G160M, G140L – NUV: G185M, G225M, G265M, G230L, TA1 mirror

STIC: COS Status - Keyes : 13 Feb 2001 Slide 6 of 21 COS Detectors  FUV: Cross Delay Line (XDL) detector > windowless, CsI photocathode, MCPs feed XDL anode > two 85 mm (dispersion-direction) x 10 mm segments (~10 mm gap between segments) > 2 x 16,384 x 1024 pixels; ~7 pixels per resolution element along dispersion > “stim pulses” to characterize stretching and shifting in both coordinates (unlike FUSE)  NUV: MAMA (STIS flight spare) > sealed CsTe photocathode > 25 mm x 25 mm detector format (constrains optical design) > 1024 x 1024 pixels; no subarrays; 2 pixels per resolution element > opto-isolator problem fixed

STIC: COS Status - Keyes : 13 Feb 2001 Slide 7 of 21 The “Heart of COS” NUV Detector (MAMA) OSM1 positions 1 of 4 optics 2 degrees of freedom (rotation, focus) OSM2 positions 1 of 5 optics 1 degree of freedom (rotation) Calibration Platform 4 lamps, 3 beam splitters Aperture Mechanism positions 1 of 2 Apertures 2 degrees of freedom (x & y translation) FUV Detector Head (DVA) NCM2 (Collimating mirror) NCM3a, 3b, 3c (Focusing mirrors) Calibration Fold Mirror External Shutter (not shown)

STIC: COS Status - Keyes : 13 Feb 2001 Slide 8 of 21 COS Modes

STIC: COS Status - Keyes : 13 Feb 2001 Slide 9 of 21 Flight Detector Segment QE QE uniformity is better than 10% over the detector area STIC: COS Status - Keyes : 13 Feb 2001 Slide 9 of courtesy COS IDT

STIC: COS Status - Keyes : 13 Feb 2001 Slide 10 of 21

STIC: COS Status - Keyes : 13 Feb 2001 Slide 11 of 21 Flight FUV Detector System --- courtesy COS IDT

STIC: COS Status - Keyes : 13 Feb 2001 Slide 12 of 21 > Background image after cathode coating on segment A: two low level hotspots, background dominated by tank ions (no ion rejection grid present). > Segment B has no hotspots. FUV Detector Background Segment A: Flight Detector (FUV01) --- courtesy COS IDT

STIC: COS Status - Keyes : 13 Feb 2001 Slide 13 of 21 COS Overview   FUV flight detector assembled – – EMI/EMC and vibration tests successfully completed – – scrub, deep flat, ship to CU upcoming   FUV detector Thermal-Vac: March 2001 at CU   FUV delivery to Ball – – flight detector: 31 March 2001 – – spare detector: 31 July 2001   Environmental (Thermal-Vac): spring 2002   Launch: November 2003 – – SM4 – – replace COSTAR

STIC: COS Status - Keyes : 13 Feb 2001 Slide 14 of 21 STScI COS Activities   “Front-end” Ground System – – proposal instructions – – scheduling system – – commanding   STScI DRM and Data Volume Estimates   “Back-end” Ground System – – define FITS file formats, keywords – – OPUS: conversion of raw data to FITS – calcos – calcos : calibration – – HDA: archiving, searches, retrieval, distribution   Working groups to apply existing strengths to process

STIC: COS Status - Keyes : 13 Feb 2001 Slide 15 of 21 STScI Scheduling System   COS Operations Working Group (COWG) – – Purpose: ongoing group to provide science-related input into Flight Software and HST “front-end” ground system development – – Members: CU, GSFC, Ball, UCB, and led by STScI – – Establish clear operations requirements prior to development – – Products: Instrument Operation Requirements (OP-01), Proposal Instructions > Reviewed local rate check requirements and algorithms > Target Acquisition changes (per IDT TAACOS simulation study) reviewed and approved

STIC: COS Status - Keyes : 13 Feb 2001 Slide 16 of 21 COS Ground System: “Front-end”  STScI Integrated Scheduling System Development – Phase 2: TIME-TAG (primary science mode) and dark exposures > FUV and NUV completed and tested at STScI > Ball testing per FSW availability timeline – Development Phase Review Team > Establish prioritized development schedule > Reviews content and ordering of remaining phases considering internal and external deliverables and test schedules – COS Front-end Implementation Group (FIG) > cross-disciplinary membership facilitates discussion and resolution of front-end development issues at working level

STIC: COS Status - Keyes : 13 Feb 2001 Slide 17 of 21 COS Phase Development Plan (Rev 4, 1/17/01) Phase 1 (1/1/00 – 6/30/00) vMacro Development vReconfigurations Phase 2 (7/1/00 – 12/31/00) vNUV Timetag Mode + Darks vFUV Timetag Mode + Darks Phase 3 (1/1/01 – 6/30/01) vFUV & NUV Accumulation Science Exposures vFUV & NUV Target Acquisition Exposures vFUV & NUV Target Peakup Exposures Phase 4 (7/1/01 – 12/31/01) vAperture Alignment Exposures vOSM1 Focus Alignment Exposures vOSM1 Rotation Alignment Exposures vOSM2 Rotation Alignment Exposures vFUV & NUV Flat Field Lamp Calibration Exposures Phase 5 (1/1/02 – 6/30/02) vFUV & NUV GO Wavelength Calibration Exposures vFUV & NUV Automatic Wavelength Calibration Exposures vFUV & NUV FP Split Exposures vSAA Contours Phase 6 (7/1/02 – 12/31/02) vSMGT Preparations vSMOV Special Commanding vFUV & NUV Anomalous Recovery vFUV & NUV Initial Turn-on vFUV & NUV BOP Target Screening Phase 7 (1/1/03 – 6/30/03) vFUV & NUV Lifetime Adjustments

STIC: COS Status - Keyes : 13 Feb 2001 Slide 18 of 21 COS Pipeline Systems  COS Pipeline Review Planning Group – Purpose: organize Pipeline PDR, CDRs  Pipeline (“Back-end”) PDR – OPUS, Hubble Data Archive, calibration ( calcos ) – 7 December 2000 at STScI – Review panel: STScI and IDT representation –  Pipeline CDRs – OPUS/HDA: April 2001 – calcos : May 2001

STIC: COS Status - Keyes : 13 Feb 2001 Slide 19 of 21 COS Ground System: “Back-end”   COS Calibration Working Group (CALWG) – – Purpose: forum for direct discussion of COS calibration issues – – Members: CU, Ball, UCB, FUSE (JHU), GSFC, and led by STScI – – Products: calibration pipeline requirements, science header keywords, science data formats, reference file requirements > Comprehensive calibration requirements document > Initial calcos flow charts > code and algorithm reuse study: lessons-learned from STIS, ACS > algorithm and code sharing with IDT

STIC: COS Status - Keyes : 13 Feb 2001 Slide 20 of 21 COS Ground System: “Back-end”   Thermal Vac Data-Processing MOU – – Agreement between STScI and IDT – – Enable pipeline capability of processing uncalibrated observations, cataloging, and archiving data by Thermal Vac. > > Establishes schedule and set of deliverables required IDT to STScI: required keywords Ball to STScI: science data format and bench test data STScI to IDT: “beta” version of OPUS Ball to STScI: test data from integrated instrument STScI: to IDT: final version of OPUS/HDA – – Eliminates duplication of effort between STScI and IDT; achieves cost savings

STIC: COS Status - Keyes : 13 Feb 2001 Slide 21 of 21 COS User Tools   Astronomer Proposal Tools – – Visual Target Tuner (Field-of-View tool) – – Exposure Time Calculator (ETC) – – Target Acquisition simulations   Instrument Handbooks   Data Handbook

STIC: COS Status - Keyes : 13 Feb 2001 Slide 22 of 21 COS Schedule