keck instruments
DESCRIPTION
Keck Instruments. The WMKO Support Astronomer Group. Introduction. Eight facility instruments Each instrument has an assigned “Master” and a “Secondary Master.” Summit instrument group provides “hands-on” assistance. (Dwight Chan and Mike Wagner) - PowerPoint PPT PresentationTRANSCRIPT
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Keck InstrumentsKeck Instruments
The WMKO Support Astronomer Group
The WMKO Support Astronomer Group
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IntroductionIntroduction
Eight facility instruments Each instrument has an assigned “Master” and a
“Secondary Master.” Summit instrument group provides “hands-on”
assistance. (Dwight Chan and Mike Wagner) Summit crew does reconfigs, basic troubleshooting,
etc.
Mainland observing update
Eight facility instruments Each instrument has an assigned “Master” and a
“Secondary Master.” Summit instrument group provides “hands-on”
assistance. (Dwight Chan and Mike Wagner) Summit crew does reconfigs, basic troubleshooting,
etc.
Mainland observing update
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Organizational ChangesOrganizational Changes
Summit instrument group reorganized and refocused.
Grant Hill acting as summit liaison Significantly improved system!
Summit instrument group reorganized and refocused.
Grant Hill acting as summit liaison Significantly improved system!
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Instrument MastersInstrument Masters
Instrument Master Second
LRIS Marc Kassis Greg Wirth
NIRC Marc Kassis Bob Goodrich
HIRES Grant Hill Hien Tran
NIRSPEC Jim Lyke Grant Hill
OSIRIS Jim Lyke Randy Campbell
NIRC2 Al Conrad Randy Campbell
DEIMOS Greg Wirth Grant Hill
ESI Greg Wirth Bob Goodrich
Mainland observing Greg Wirth
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LRIS StatusLRIS Status
Marc KassisMarc Kassis
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Recent LRIS Problems Addressed
Recent LRIS Problems Addressed
Replaced the blue side shutter with spares (x2) New parts machined Spares refurbished by Caltech
Replaced damaged Blue side Dewar window Replaced broken slitmask rollers after repeated
mechanism jambs Repaired offset guider encoder Repaired slit viewing guider glycol leak Replaced grating Compumotor and encoder
Replaced the blue side shutter with spares (x2) New parts machined Spares refurbished by Caltech
Replaced damaged Blue side Dewar window Replaced broken slitmask rollers after repeated
mechanism jambs Repaired offset guider encoder Repaired slit viewing guider glycol leak Replaced grating Compumotor and encoder
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Recent LRIS ImprovementsRecent LRIS Improvements
Software Released slitmask imaging tool Released automated focus routines Implemented long slit and polarimeter focusing routines
Hardware upgraded limit switches for slitmask grabber and trapdoor to
improve reliability Documentation
Revamped LRIS web pages Observers very pleased with updated content Page style may change to further improve navigation and
appearance
Software Released slitmask imaging tool Released automated focus routines Implemented long slit and polarimeter focusing routines
Hardware upgraded limit switches for slitmask grabber and trapdoor to
improve reliability Documentation
Revamped LRIS web pages Observers very pleased with updated content Page style may change to further improve navigation and
appearance
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Current LRIS ConcernsCurrent LRIS Concerns
• Blue and Red side shutters. Blue shutter failure rate is 1.5 years Red shutter does not have a good spare Identifying possible solutions for replacement (Caltech involved)
• Blue side CCD power drops (ongoing investigation)• Slitmask door mechanical problem; new latches planned• Grating port three homing problem; limit switches need
adjustment• Blue side carousel flags prone to misalignment – more robust
switches identified (Caltech involved)
• Blue and Red side shutters. Blue shutter failure rate is 1.5 years Red shutter does not have a good spare Identifying possible solutions for replacement (Caltech involved)
• Blue side CCD power drops (ongoing investigation)• Slitmask door mechanical problem; new latches planned• Grating port three homing problem; limit switches need
adjustment• Blue side carousel flags prone to misalignment – more robust
switches identified (Caltech involved)
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LRIS Optical IssuesLRIS Optical Issues Instrument focus
dependent on rotation and elevation.
LRIS rotational center is offset from the telescope’s mechanical and optical axis by 1.5 in
This affects image quality detrimentally
Instrument focus dependent on rotation and elevation.
LRIS rotational center is offset from the telescope’s mechanical and optical axis by 1.5 in
This affects image quality detrimentally
The K1+f/15 center of rotation is marked by black theodolite cross hairs while yellow fishing line marks the center of the LRIS optical axis.Photo taken during ADC alignment by Drew Phillips.
K1+ f/15
LRIS
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Future LRIS UpgradesFuture LRIS Upgrades
Hardware1. Install Fe/Ar and
deuterium lamps for calibrating blue side
2. Improve slitmask frames
3. Improve slitmask guides for better reliability
Hardware1. Install Fe/Ar and
deuterium lamps for calibrating blue side
2. Improve slitmask frames
3. Improve slitmask guides for better reliability
Fe/Ar lamp
1200/3400 grism
Tint=30s
39002900 3400
cou
nts
Angstroms
SoftwareDevelop calibration GUIS similar to DEIMOS or HIRES Expand FITS headers to include slitmask design and target
information to aid slitmask alignment & data reductionReplace FIGDISP with DS9 reliability
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LRIS Performance MonitoringLRIS Performance Monitoring
Released scripts that reconfigure the instrument and acquire throughput data
Completing LRIS mechanical checkouts prior to each observing run
Implemented software to check common detector parameters (gain, read noise, linearity).
Released scripts that reconfigure the instrument and acquire throughput data
Completing LRIS mechanical checkouts prior to each observing run
Implemented software to check common detector parameters (gain, read noise, linearity).
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NIRC(a.k.a. NIRC classic)
NIRC(a.k.a. NIRC classic)
Marc KassisMarc Kassis
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Status of NIRC ClassicStatus of NIRC Classic
NIRC is rarely used Six nights in 2006B Four nights in 2007A
Following the earthquake Guider was used as an emergency spare for
the LRIS slit-viewing guider Dewar was thermally cycled to address an
image artifact (“flash light effect”)
NIRC is rarely used Six nights in 2006B Four nights in 2007A
Following the earthquake Guider was used as an emergency spare for
the LRIS slit-viewing guider Dewar was thermally cycled to address an
image artifact (“flash light effect”)
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HIRESHIRES
Grant HillGrant Hill
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HIRES Recent Work HIRES Recent Work
• Semi-regular monitoring of detector characteristics begun, Feb. 06.
• Replaced ion pump and oxygen-soaked mosaic, May 06.
• Considerable progress on web pages. (Number of updated and activated pages more than doubled.)
• Earthquake.• Installation of new comparison lamp begun (ongoing).• Review of spare inventory and purchases begun.
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HIRES Earthquake-induced focus change
HIRES Earthquake-induced focus change
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HIRES Current IssuesHIRES Current Issues
Further documentation and web pages improvements. Likely to be a background effort over next year. Goal is have manual rewritten by end of 2007.
Occasional reports of wavelength instability. Investigations so far inconclusive. Further experiments planned in April–June.
PM program. PM program for all instruments proposed as an FY08 project. Project will include predictive and preventative maintenance and
performance monitoring. Project proposal includes planning tool improvement/construction
(e.g. exposure time calculator, echelle simulator, etc.)
Further documentation and web pages improvements. Likely to be a background effort over next year. Goal is have manual rewritten by end of 2007.
Occasional reports of wavelength instability. Investigations so far inconclusive. Further experiments planned in April–June.
PM program. PM program for all instruments proposed as an FY08 project. Project will include predictive and preventative maintenance and
performance monitoring. Project proposal includes planning tool improvement/construction
(e.g. exposure time calculator, echelle simulator, etc.)
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NIRSPECNIRSPEC
Jim LykeJim Lyke
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NIRSPECNIRSPEC
Anonymous user comments:
“NIRSPEC works.”
“SCAM is invaluable.”
“I don’t trust the rotator.”
Anonymous user comments:
“NIRSPEC works.”
“SCAM is invaluable.”
“I don’t trust the rotator.”
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NIRSPEC Recent Work NIRSPEC Recent Work
NIRSPAO is back! Six nights in Dec. 2006, including first LGS-AO
night. Two nights in June 2007.
Cold heads replaced March 16, 2005 65,000 operating hours (7+ years)
Server improvements have eliminated most server crashes.
EFS now allows user-defined nods
NIRSPAO is back! Six nights in Dec. 2006, including first LGS-AO
night. Two nights in June 2007.
Cold heads replaced March 16, 2005 65,000 operating hours (7+ years)
Server improvements have eliminated most server crashes.
EFS now allows user-defined nods
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NIRSPEC Current IssuesNIRSPEC Current Issues
Rotator slews move the echelle Dispersion direction–not seen in low-res Arc lines shift by 1 pixel Re-emergence of an old problem; solved by replacing
motor last time. Slit primary init switch faulty Server crashes
Rotator-caused crashes are gone Dirty optical fibers for some Mystery cause for others
SCAM intermittent quadrant Ice on dewar window
Rotator slews move the echelle Dispersion direction–not seen in low-res Arc lines shift by 1 pixel Re-emergence of an old problem; solved by replacing
motor last time. Slit primary init switch faulty Server crashes
Rotator-caused crashes are gone Dirty optical fibers for some Mystery cause for others
SCAM intermittent quadrant Ice on dewar window
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NIRSPEC Window IceNIRSPEC Window Ice
Recurring problem (every 6–12 months) Previously, replaced window March experiment to just warm and pump
dewar was successful
Recurring problem (every 6–12 months) Previously, replaced window March experiment to just warm and pump
dewar was successful
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NIRSPECNIRSPEC
Ice absorption at 3.1 m is gone Most recent: middle plot, green line
Before After
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NIRSPECNIRSPEC
Upcoming Events NIRSPEC’s 8th Birthday April 25, 2007
800+ science nights allocated Possible service for rotator and slit MAGIQ upgrade Fall 2007
Upcoming Events NIRSPEC’s 8th Birthday April 25, 2007
800+ science nights allocated Possible service for rotator and slit MAGIQ upgrade Fall 2007
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OSIRISOSIRIS
Jim LykeJim Lyke
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OSIRIS Earthquake DamageOSIRIS Earthquake Damage
Fully functional after repair 4 nights lost (switched to NIRC2)
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OSIRIS Current IssuesOSIRIS Current Issues
Small FOV 0.32 x 1.28 arc sec Relative astrometry vital!
Less sensitive Calculation error Grating efficiency
Not many papers Data reduction difficult, but
help is coming!
Small FOV 0.32 x 1.28 arc sec Relative astrometry vital!
Less sensitive Calculation error Grating efficiency
Not many papers Data reduction difficult, but
help is coming!
Sensitivities (ZP mag w/ flux in DN/s)
FilterOrigina
lNow Δmag
J 25.9 23.5 2.4
H 26.7 24.3 2.4
K 26.1 23.7 2.4
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OSIRIS PapersOSIRIS Papers
NIRSPEC
YearAllocated
nights*Papers
1999 16.0 0
2000 127.0 7
Total 143.0 7
20.4 nights per paper
OSIRIS
YearAllocated
nights*Papers
2005 15.0 0
2006 47.0 4
Total 62.0 4
15.5 nights per paper
* Engineering nights not included
The rate of papers per night for OSIRIS, a year after commissioning, is similar to the rate for NIRSPEC, a year after it commissioned.
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OSIRISOSIRIS
DRP Issues Distributed.
No mechanism to notify users of updates
New and different data products No dedicated support
No Telluric Correction Long integrations Changing sky background
DRP Issues Distributed.
No mechanism to notify users of updates
New and different data products No dedicated support
No Telluric Correction Long integrations Changing sky background
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OSIRIS FutureOSIRIS Future
What’s Next? Papers!
Breakthrough with telluric correction Use background region to calculate sky
Many are working on techniques and tools Larkin, Wright, McElwain (UCLA) Team Keck (using Director’s nights—thanks, Taft!) Perrin, Laver, Adamkovics (UCB) Law (CIT)
What’s Next? Papers!
Breakthrough with telluric correction Use background region to calculate sky
Many are working on techniques and tools Larkin, Wright, McElwain (UCLA) Team Keck (using Director’s nights—thanks, Taft!) Perrin, Laver, Adamkovics (UCB) Law (CIT)
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NIRC2NIRC2
Al ConradAl Conrad
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NIRC2 Recent WorkNIRC2 Recent Work
Cold since August 2003 Use has broadened since LGSAO commissioned
LGS/NGS ratio approx. 3-to-1
e.g., Faint Galaxies
Calibration lamps available
Use of pupil masks increasing
Cold since August 2003 Use has broadened since LGSAO commissioned
LGS/NGS ratio approx. 3-to-1
e.g., Faint Galaxies
Calibration lamps available
Use of pupil masks increasing
Galaxy 4C29.28 ER2 from “Identification and Morphologies of Galaxies with Old Stellar Populations
at z 2.5” Alan Stockton and Elizabeth McGrath
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NIRC2 Current IssuesNIRC2 Current Issues
• Motor homing• Detector Noise
NIRC2 one-second dark showing fixed pattern noise in
lower left quadrant
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NIRC2 Project: AstrometryNIRC2 Project: Astrometry Goal: Better characterize PA, plate scale, & distortion Goal: Better characterize PA, plate scale, & distortion
2 data source types: Images of clusters and pin-holes
easy arcsec/pixel ao+tel+nirc2
N/A mm/pixel nirc2 only
CLUSTER
PINHOLE
Plate ScalePosition Angle Distortion
Summary of Results:Summary of Results:
• Plate Scale: Fit residuals 0.06–0.09 pixels; 6–8 times more precise than preship values.• PA: Known to within 0.1 degrees; may improve with further analysis. • Pin-hole distortion: subpixel in the interior; 2–3 pixels at the edge.
• Plate Scale: Fit residuals 0.06–0.09 pixels; 6–8 times more precise than preship values.• PA: Known to within 0.1 degrees; may improve with further analysis. • Pin-hole distortion: subpixel in the interior; 2–3 pixels at the edge.
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NIRC2 Astrometry (cont.)NIRC2 Astrometry (cont.)Report: by Brian Cameron (posted on the NIRC2 web page)
Related work: Konopacky, Britton, Lu, others.
• Recommended fields and observing scripts.• Voluntary repository.• dewarp tool (written in IDL).
Web Page for Astrometry Calibration:
Narrowcamera
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DEIMOSDEIMOS
Greg WirthGreg Wirth
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DEIMOS Recent WorkDEIMOS Recent Work
DEIMOS has been working very reliably with only minor problems
Slitmask system jammed due to re-use of old and warped masks (e.g. long slits); resolved by discarding certain old masks
Spurious rotator moves during mask alignments traced to missing DCS keywords; fixed by software patch
Grating moves sometimes failed due to misalignments; fixed by revising target position
DEIMOS has been working very reliably with only minor problems
Slitmask system jammed due to re-use of old and warped masks (e.g. long slits); resolved by discarding certain old masks
Spurious rotator moves during mask alignments traced to missing DCS keywords; fixed by software patch
Grating moves sometimes failed due to misalignments; fixed by revising target position
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DEIMOS Current IssuesDEIMOS Current Issues
Pattern noise is present on 2 of 8 science CCDs since earthquake; troubleshooting a possible grounding problem
Slitmasks continue to generate dust that contaminates optics, but fix is costly
Pattern noise is present on 2 of 8 science CCDs since earthquake; troubleshooting a possible grounding problem
Slitmasks continue to generate dust that contaminates optics, but fix is costly
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DEIMOS Performance Monitoring
DEIMOS Performance Monitoring
Basic mechanical and optical checkouts performed before each run
Coatings on collimator and tent mirror being inspected and measured bimonthly for condition and reflectance
Standard star throughput data being gathered monthly; analysis pending
Basic mechanical and optical checkouts performed before each run
Coatings on collimator and tent mirror being inspected and measured bimonthly for condition and reflectance
Standard star throughput data being gathered monthly; analysis pending
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DEIMOS FutureDEIMOS Future
Urgent Resolve CCD noise problems
Performance Monitoring Analyze throughput data Clean optics and gratings Automate monthly checkout procedures
If time permits Commission ultrasonic slitmask cleaner Purchase replacement clear, V filters to replace
damaged ones Install science-grade imaging mirror
Urgent Resolve CCD noise problems
Performance Monitoring Analyze throughput data Clean optics and gratings Automate monthly checkout procedures
If time permits Commission ultrasonic slitmask cleaner Purchase replacement clear, V filters to replace
damaged ones Install science-grade imaging mirror
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ESIESI
Greg WirthGreg Wirth
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ESI Recent ProblemsESI Recent Problems
Bearing failed in middle wheel of triple-wheel assembly; UCO/Lick replaced all 6 bearings in system
Belt drive system for triple wheel has broken several times; UCO/Lick has redesigned system to improve reliability
Optical encoders on triple wheels prone to signal loss; serviced and aligned units
Bearing failed in middle wheel of triple-wheel assembly; UCO/Lick replaced all 6 bearings in system
Belt drive system for triple wheel has broken several times; UCO/Lick has redesigned system to improve reliability
Optical encoders on triple wheels prone to signal loss; serviced and aligned units
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ESI Current IssuesESI Current Issues
1. Optical coupling fluid leaked onto shutter and camera optics, but has not seriously impacted observing
2. ESI host computer is obsolete and unreliable; UCO/Lick is helping us convert to new host computer
3. Collimator coating is in poor condition; needs recoating4. Collimator actuator #1 fails some moves,
troubleshooting in progress5. Coupling to slitmask wheel is marginal, requires
replacing6. Flexure characteristics were rechecked and are
consistent with results at commissioning
1. Optical coupling fluid leaked onto shutter and camera optics, but has not seriously impacted observing
2. ESI host computer is obsolete and unreliable; UCO/Lick is helping us convert to new host computer
3. Collimator coating is in poor condition; needs recoating4. Collimator actuator #1 fails some moves,
troubleshooting in progress5. Coupling to slitmask wheel is marginal, requires
replacing6. Flexure characteristics were rechecked and are
consistent with results at commissioning
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ESI FutureESI Future
Urgent Mitigate optical coupling fluid contamination Improve triple-wheel encoder alignment Troubleshoot failed collimator moves Replace slitmask wheel coupling Investigate coating options for collimator
If time allows Upgrade host computer for maintainability Replace FIGDISP with ds9 image display tool Begin program of regular throughput monitoring
Urgent Mitigate optical coupling fluid contamination Improve triple-wheel encoder alignment Troubleshoot failed collimator moves Replace slitmask wheel coupling Investigate coating options for collimator
If time allows Upgrade host computer for maintainability Replace FIGDISP with ds9 image display tool Begin program of regular throughput monitoring
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Mainland ObservingMainland Observing
Greg WirthBob KibrickGreg Wirth
Bob Kibrick
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Mainland Observing Background
Mainland Observing Background
Goal: to provide observers at mainland sites the same capabilities as in Waimea
Strategy: employ VNC software to permit sharing of desktops between observers at mainland sites and Waimea
Benefit: provides observers flexibility, e.g. to take advantage of give-back science nights, deal with personal crises, possible time-domain astronomy
Goal: to provide observers at mainland sites the same capabilities as in Waimea
Strategy: employ VNC software to permit sharing of desktops between observers at mainland sites and Waimea
Benefit: provides observers flexibility, e.g. to take advantage of give-back science nights, deal with personal crises, possible time-domain astronomy
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Mainland Observing StatusMainland Observing Status
System stable and reliable with near-zero downtime
Sites: Caltech, LBNL, UCSC, UCLA, UCSD Instruments: all supported except IF Usage: 142 nights since 2006A Modes of operation:
Shared mainland and Waimea operation (84%) Mainland-only operation (14%) Video-only (2%)
System stable and reliable with near-zero downtime
Sites: Caltech, LBNL, UCSC, UCLA, UCSD Instruments: all supported except IF Usage: 142 nights since 2006A Modes of operation:
Shared mainland and Waimea operation (84%) Mainland-only operation (14%) Video-only (2%)
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Mainland Observing Usage by Instrument*
Mainland Observing Usage by Instrument*
NIRC
NIRSPECOSIRIS ESI
DEIMOS
NIRC2 HIRES
LRIS
0
5
10
15
20
25
30
35
Nig
hts
NIRC
NIRSPECOSIRIS ESI
DEIMOS
NIRC2 HIRES
LRIS
0
5
10
15
20
25
30
35
Nig
hts
* usage since 2006A
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Mainland Observing Usage by Site*Mainland Observing Usage by Site*
0
5
10
15
20
25
30
35
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UCSC UCLA CIT LBNL UCSD0
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UCSC UCLA CIT LBNL UCSD
* usage since 2006A
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Mainland Observing IssuesMainland Observing Issues
Backup lines: currently providing ISDN backup to only one site per night (limits us to only one telescope per night)
Conflicts: limited to one observing team per site Performance: slightly slower under VNC
compared to normal Waimea operation Operation: LBNL site not yet compliant
Lacks router for ISDN backup lines Provided computers not yet compliant
Backup lines: currently providing ISDN backup to only one site per night (limits us to only one telescope per night)
Conflicts: limited to one observing team per site Performance: slightly slower under VNC
compared to normal Waimea operation Operation: LBNL site not yet compliant
Lacks router for ISDN backup lines Provided computers not yet compliant
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Future Mainland Observing Actions
Future Mainland Observing Actions
Add new summit ISDN lines for two-telescope operation Improve performance by:
Installing dedicated VNC server hosts Testing alternative technologies to VNC
Design/implement improved request tracking system Simplify software start procedure Develop second observing room at CIT (two teams at
one site!) Consider new sites for UCSB and NASA
Add new summit ISDN lines for two-telescope operation Improve performance by:
Installing dedicated VNC server hosts Testing alternative technologies to VNC
Design/implement improved request tracking system Simplify software start procedure Develop second observing room at CIT (two teams at
one site!) Consider new sites for UCSB and NASA
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Keck Observatory ArchiveKeck Observatory Archive
Hien TranHien Tran
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KOAKOA
Passed Directors’ Review, May 2006 Went public, July 2006 Current and future development:
Split-night data-taking GUI (May FY07; will also help time-domain astronomy)
Level-1 processing; pilot program in FY07. Legacy data ingestion; possible FY08 addition.
Passed Directors’ Review, May 2006 Went public, July 2006 Current and future development:
Split-night data-taking GUI (May FY07; will also help time-domain astronomy)
Level-1 processing; pilot program in FY07. Legacy data ingestion; possible FY08 addition.