Working Group Meeting November 22, 2005

1
Working Group MeetingNovember 22, 2005
2
Agenda

• 200 Welcome Introductions. Review agenda.
• 210 LGS AO System Status Schedules
• Purpose Informational
• 215 Collisions
• Purpose Reduction of frequency impact of
  collisions
• 300 Aircraft safety Laser Clearinghouse
• Purpose Reduction of overhead (summit aircraft
  safety system, improved LC interaction)
• 325 Mauna Kea Laser Policy
• Purpose Update policy if appropriate
• 340 Other issues?
• 350 Next steps action items
• Purpose Clear path forward

PW
3
Welcome Introductions

• MK LGS TWG
• Doug Simons (Gemini)
• Hideki Takami (Subaru)
• Christian Veillet (CFHT)
• Richard Wainscoat (UH)
• Peter Wizinowich (Keck)
• Other Participants
• Gemini Mathieu Bec, Celine dOrgeville, Francois
  Rigaut
• Keck Randy Campbell, David Le Mignant, Doug
  Summers
• Subaru Yutaka Hayano

PW
4
LGS AO System Status Schedules

• Keck
• Gemini
• Subaru

PW
5
Keck LGS AOThe top priority for Keck Science

• Keck II Laser propagation summary and plans
• Operational model by 07A1 OA at HQ to operate
  LGS 1 at summit to monitor laser safety
  systems in addition to telescope
• Keck I
• 20W mode locked CW laser contracted with CTI
• LGS AO system design in FY06. Implementation
  into FY08.

Year 2002 03 04 05 06 07
nights 2 16 17 47 100 140
DLM
6
Gemini LGS AO

• GN 12W laser and Altair
• LGS first light on May 2, 05
• 2.5 nights for LGSF technical commissioning (May
  05) including star wars test w/ Keck 16 nights
  for Altair LGS technical commissioning (June,
  July, Aug, Sep, Nov 05)
• Science commissioning on hold until Feb 06 LLT M1
  re-polished 10-12 nights planned in 2006A
• Commissioning of instruments in LGS mode NIFS,
  etc.
• Operational model for 06B1 laser tech at summit
  to prep laser in the afternoon and monitor laser
  safety systems for first part of the night,
  remote support from home/HP as needed
• GS 50W laser and MCAO
• 50W mode locked CW laser contracted with CTI,
  delivery in Jan 07
• MCAO IT through 2006
• LGS first light in 2007A, tech science
  commissioning by end of 2007B

CdO
7
Subaru LGSAO

• 188 element curvature sensor AO
• 4W sum frequency laser collaborated with
  RIKEN at Nasmyth focus (10W upgrade is planned)
• 2005/10 Laser projection demo in Japan
• 2006/1 NGS laboratory closed loop
• Laser LLT deliver to Hilo
• 2006/8 NGS first light
• 2006/12 First projection of laser to the sky
• 2007/3 LGS first light

HT
8
LAYOUT of Subaru LGSAO
Instruments IRCS, HiCIAO
HT
9
Collisions

• Collision frequency impact
• Keck statistics
• Is this consistent with predictions?
• Rayleigh scatter impact
• Subaru measurement of Keck beam
• UH image
• Impact of cirrus
• Impact on instruments
• CFHT, Gemini, Keck, Subaru, UH
• URLs
• How are they set at each Observatory?
• Can this be done better
• LTCS
• Gemini/Keck test
• What should be improved
• Ideas for reducing collision frequency impact

PW
10
Collision Frequency Impact

• Keck statistics
• Average of 18 min time lost to collisions per
  night
• Time altered considerably more broken dither
  pattern, switching to lower priority object,
  taking more calibrations than necessary, etc.

• Notes
• Collide with all telescopes (except UKIRT?)
• Dont collide with K1 more frequently (likely
  because no impact flag set whenever possible)
• Some recent collisions apparently during slewing
  by other telescopes (UH Subaru)
• Had collisions while aligning laser at zenith
  when CFHT Subaru werent tracking (collecting
  twilight flats)

RC
11
Collision Frequency Impact

• Gemini preliminary data
• Data not automatically collected yet
• Based on May, June, July, Aug, Sep and Nov 2005
  engineering runs (lots of zenith propagation, no
  real science and no queue yet) 0-3
  collisions/night (none in 2-night Nov run!?)

Run (2005) May June July Aug Sep Nov
nights 2 4 6 3 3 2
Predicted collisions gt2 ? 2 1xCFHT
Effective collisions 2 2 0
RC
12
Scatter Impact Measurement withKeck II and
Subaru (Hayano et al. 2003)

• Keck II was pointed to SAO99809 on December 24,
  2001. (El 70 - 80).
• Subaru was pointed to fixed direction. (El 45,
  60).
• Scattered light was measured by APDs of Subaru AO
  WFS.
• Three collisions were observed.

YH
13
Scatter Impact Measurement withKeck II and
Subaru (Hayano et al. 2003)

• Pupil plane measurement for finite FOV q (e.g. 1
  arcsec).
• If (dL q) lt D, pupil does not illuminate fully.
  (Larger D, closer laser beam L).
• Smaller telescope affected more.
• Sky background proportional to D2, while laser
  beam scattered light proportional to min(D2,
  D(dL q)).
• Imager with smaller pixel scale less sensitive to
  laser beam scattering.
• Laser beam seems to be bright to naked eye or a
  sky monitor camera.

• Focal plane measurement.
• Laser beam scattered light completely defocused
  with a size of (dD)/L radian.
• 1 arcmin _at_ 30km, 0.5 degree _at_ 1km
• 19 arcsec _at_ 90km, (LGS size at focal plane)
• If LGS magnitude is 10,
• 14mag/arcsec2 _at_ 80m (19x38 arcsec2)
• 18.8mag/arcsec2 _at_1000m (19x231 arcsec2)

YH
14
Estimation of Scatter Impact (Hayano et al. 2003)

• Rayleigh scatter and Mie scatter model
• Number density of molecule is derived from Hilo
  radio-sonde observation. (for Rayleigh)
• Aerosol distribution mode is estimated from
  AERONET database and particle counter data at
  Subaru for Mie scatter evaluation. (Scale height
  of aerosol was 3km. It was class 14000 at
  Mauna Kea.)
• Model calculation showed that the number of
  Rayleigh scattered photons was about 6 times as
  much as that of Mie scattered photons.
• Roughly speaking, the surface brightness of 17.5
  mag/arcsec2 is comparable to the sky brightness
  at about 15 degrees away from full moon.
• The impact is larger for smaller and nearer
  telescopes.

YH
15
Rayleigh Scatter Impact from digital photograph

• Factor 8 brighter than dark sky in R (2.2
  magnitudes)
• Factor 4 brighter than dark sky in V (1.5
  magnitudes)

Dark sky R 20.3 mag/()2 V 21.1 mag/()2
RW
16
Rayleigh Scatter Cirrus

• Current Keck propagation criteria have been
  revised in KAON 318
• 1. The laser must be shuttered if spotters detect
  an aircraft within 25º of the beam.
• The laser must be shuttered if thick clouds are
  present within 25º of the beam, preventing
  approaching aircraft from being seen.
• Our experience is that we have been able to
  propagate through thin cirrus ( have productive
  LGSAO science nights). The spotters report to the
  Observing Assistant (OA) on the passing of thin
  clouds that could produce an increase in
  scattered light. The OA LGSAO operator monitor
  the scattered light using the WFS intensity
  display, the acquisition camera and other
  available tools if the amount of scattered light
  is such that the laser return has decreased by
  more than a factor 2 on the WFS (0.75 mag), the
  LGSAO operator OA will close the shutter.

DLM
17
Impact on Instruments - Keck
Instrument FOV (old) FOV (new) Science BW µm Guider BW µm Guide Pos Na Impact Rayleigh Impact
ESI 0.133 0.189 0.3-1.0 0.5-0.9 150" off axis Yes Yes
HIRES 0.018 0.017 0.3-1.0 0.5-0.9 on axis Yes Yes
NIRC 0.228 0.156 1.0 - 4.0 0.5-0.9 250" off axis Yes Yes

PCS or SSC 0.25 0.025 0.5-0.9 n/a No No
AO/IF 0.25 0.022 1.6 - 12.0 0.5-0.9 on axis Yes No

DEIMOS 0.381 0.3-1.0 0.5-0.9 Yes Yes
LRIS 0.313 0.189 0.3-1.0 0.5-0.9 300" off axis Yes Yes
NIRSPEC 0.055 0.085 1.0 - 5.0 0.5-0.9 on axis Yes Yes
AO/NIRC2 0.033 0.022 1.0 - 5.0 0.5-0.9 on axis Yes No
AO/NIRSPEC 0.033 0.022 1.0 - 2.5 0.5-0.9 on axis Yes No
AO/OSIRIS 0.033 0.022 1.0 - 2.5 0.5-0.9 on axis Yes No
Keck I, Keck II, Both
PW
18
Impact on Instruments - Gemini
Instrument or Wavefront Sensor Science Channel Wavelength Range (µm) Science Channel FOV (dia. - arcmin) Wavefront Sensor Wavelength Range (µm) Wavefront Sensor Patrol Fielda (dia. - arcmin)
AG - P1 N/A N/A 0.4-1.0 14
AG - P2 N/A N/A 0.4-1.0 14
HRWFS N/A N/A 0.4-1.0 lt0.05
Acq. Cam. N/A N/A 0.4-1.0 2
NIRI 1-5 3 (0.3b) 1-2.5 3 (2b)
GMOS 0.4-1.0 5.5 0.4-1.0 3.5x4.2c
MICHELLE 8-25 0.3 N/A N/A
NIFS 1-2.5 0.05b 1-2.5 3 (2b)
ALTAIR N/A N/A 0.4-1.0 2 (lt0.05d)
a) All wavefront sensors use patrol fields
centered on telescopes field except GMOS b) When
used in conjunction with ALTAIR c) Centered 2.5
arcmin off-axis d) LGS wavefront sensor
DS
19
Impact on Instruments - CFHT

• "Prime" or "MP" fov 1.1667?
• "Cass" fov 0.8
• "I.R." fov 1.1667
• "Coude" fov 0.8
• anything else fov 1.1667
• This is actually old information at a time when
  the TCS could not recognize the instruments. It
  needs updating with the current instrumentation
  and better numbers for the FOV.
• "Prime" should be the only one at 1.1667!
• "I.R" (the new WIRCam) is much smaller, and there
  should not be "anything else"!

CV
20
Impact on Instruments - Subaru
Instrument Focus FOV wavelength (um) Guider search area
SuprimeCam Prime 34x27 B-z 58 dia.
FMOS ( 2006) Prime 30 dia. 0.9-1.8 43 dia.
FOCAS Cs 6 dia. 0.33-1.0 10 dia.
MOIRCS Cs 4x7 1.17-2.30 10 dia.
CISCO Nas IR 108x108 0.88-2.51 8.8 dia.
HDS Nas Opt 60 Slit viewer 0.31-0.94 6 dia.
IRCS (2005/12) Nas IR 48x48 0.92-4.8 8.8 dia.
COMICS Cs 42''x32'' 8.0-25.5 10 dia.
CIAO Cs 22x22 J-M 10 dia.
They are the upper limit of the search area,
HT
21
Impact on Instruments - UH 2.2-m

• Tek 2048 FOV 0.18 deg 0.4-1.0 microns
• Optic CCD FOV 0.22 deg 0.4-1.0 microns
• 8k CCD FOV 0.78 deg 0.4-1.0 microns
• Offset Guider FOV 0.83 deg 0.4-1.0 microns
• ULBCAM FOV 0.4 deg 1.0-1.8 microns (no
  impact)
• WFGS2 FOV 0.26 deg 0.4-1.0 microns
• SNIFS FOV 0.002 deg 0.3-1.0 microns

RW
22
Impact on Instruments - IRTF

• Guider (on axis) FOV 0.008 deg 0.4-1.0 microns

RW
23
Standard URL

• Includes the following fields (as per the
  LTCS_URL_Interface_Specification dated Feb 7,
  2002)
• Timestamp1 - local time (time of URL update)
• Telescope - telescope name
• RA - telescope right ascension (hrs)
• DEC - telescope declination (deg)
• Equinox - equinox and epoch of coordinates
• FOV - diameter of field of view
• Laser_impacted - telescope is (or is not) laser
  sensitive
• Laser_state - telescope is (or is not)
  projecting a laser
• log_data - flag to enable/disable logging of
  pointing data
• Timestamp2 - local time (time of URL update)

DS
24
URL setup KECK1 KECK2

• URL updates accomplished automatically via
  programmatic control (Java/solaris)
• FOV values determined via current instrument
  lookup
• RA/DEC/Equinox set from TCS with az/el/frame
  conversion to RA/DEC/Eq (as needed)
• LASER_IMPACT set from combination of domeshutter
  state, dome track state, and telescope track
  state.
• LASER_STATE set from laser fast-shutter state
  (with capability to override)
• Program runs in near-real time as fast as
  keyword layer parameter changes occur,
  notification rewrite of the URL file occurs.

DS
25
URL setup Subaru

• URL address
• http//www.naoj.hawaii.edu8011/cgi-bin/ltcs.cgi
  
• http//www2.naoj.hawaii.edu8011/cgi-bin/ltcs.cgi
  (backup)
• http//www3.naoj.hawaii.edu8011/cgi-bin/ltcs.cgi
  (backup)
• Update interval of URL page is changed by
  executing some commands through at table from
  15 seconds to 1 second during LGS observation.
• FOV is set to be 1 degree for Prime Focus Camera
  and 8 arcmin (FOV of AG roughly) for other
  instruments. (tentative)
• RA/DEC/EQUINOX information is gotten from TCS.
• TIMESTAMP is gotten from NTP server at Subaru.
• Information collected from the telescope
  telemetry server almost in real time.
• LASER_IMPACT sets if RA/Dec changes slower than
  0.1 deg/sec. (tentative patch on Nov. 10, 2005)

26
URL setup Subaru

• Prof. Ryu Ogasawara still manages the URL setup,
  even after he moved to ALMA project. (Handover is
  to be scheduled.)
• Are we clear on who the URL contacts are at each
  Observatory?
• Prof. Ryu Ogasawara (ryu.ogasawara_at_nao.ac.jp)
• Handover is to be scheduled soon.
• Yutaka Hayano (hayano_at_subaru.naoj.org)
• How is laser propagation information supplied to
  nighttime operations personnel?
• The announcement of laser projection is
  circulated the mailing list of operation center
  including night operators and support
  astronomers.

27
URL setup

• CFHT
• Gemini (128.171.88.53)
• UH
• IRTF
• Are we clear on who the URL contacts are at each
  Observatory?
• How is laser propagation information supplied to
  nighttime operations personnel?

DS
28
LTCS

• Current LTCS version (1st Generation)
• Limited testing with other telescopes
• Limited resources for development testing (LTCS
  URLs)
• Installations version consistency between Keck,
  Gemini, Subaru
• URL Site issues
• Some manual (vs. TCS/programmatic control)
  setting of parameters
• RA/DEC precision slew issues being worked with
  Subaru
• Slewing with Laser_impactedYES (most
  observatories)
• Re-development of LTCS by Subaru.
• 2nd generation LTCS SW install testing
• Consistency with La Palma SW baseline (Joint dev,
  more functionality)
• New priority-based rules (backward compatible to
  MK config)
• Laser/Laser first on target wins algorithm
  included
• New tools (simulation/Query)
• Slew filtering (auto-detection) notification
• Some improvements over 1st generation issues
  above, but also some similar issues (more
  coordination for version control bug fixes,
  etc.)

DS
29
LTCS Positional Errors URL polling

• Positional Error
• Current version uses FOV cone extension
  (currently 10 for all telescopes in MK config)
  as error term.
• 2nd generation LTCS adds survey inaccuracy
  parameter to base telescope position (effectively
  an aperture increase)
• URL polling rates
• Kecks 1 sec
• Gemini 1 sec
• UH2.2 1 sec
• CFHT 3 sec
• Subaru 3 sec
• IRTF 5 sec
• STALE processing for all sites is currently
  configured for 120 seconds.

DS
30
Other LTCS Issues

• LTCS priority rules As laser investments
  increase to 4 lasers on MK, should we consider
  migration to a La Palma type collision priority
  rules model (first-on-target wins)?
• All telecopes have access to Query/planning tools
  for target selections.
• Favorable query response indicates ability to
  stay locked on target throughout observation
  unfavorable response indicates collision times
  (for planning when to shutter science camera
  and/or laser depending on who has priority).
• Maximizes fairness observing efficiency
  reduces shutter time
• Ability to configure fully independent priority
  rules can have ELT (for instance) have priority
  over all telescopes or establish custom priority
  rules for each telescope/laser combination.

DS
31
Ideas for Reducing Collision Frequency Impact

• Better collision predictions
• No impact while slewing
• More careful setting of URL
• Instrument fov
• Laser impacted flag
• Observer program taken into account?
• Distinction between Na Rayleigh scatter impact
• Different criteria for shuttering

DS
32
Aircraft Satellite Safety

• FAA renewal issues
• Spotters
• Boresight camera systems (Gemini, Keck)
• Gemini wide field camera system
• Mosaic radar?
• Collaboration with other groups (JPL, Palomar)?
• Laser Clearinghouse
• How do we want to collaborate?

PW
33
FAA Renewal Issues

• Keck proposal renewed till Dec. 06
• Kecks experience
• Requested collection and compilation of spotters
  data (aircraft and weather) is a cumbersome
  process, yet interesting for statistics on laser
  propagation operations.
• 2 aircraft incidences since 2001 (and we
  shuttered per procedure)
• 2006 renewal process 1 month FTE, benefited from
  previous renewals
• Would like to review proposal process w/ other
  observatories.
• Our FAA contact doesnt have a lot of faith in
  oxygen-deprived observers looking in a
  star-filled sky for aircraft. Yet, understands
  the expense to the observatory, and the logistics
  involved.
• FAA actually recommends working on implementing
  the JPL system that is currently being reviewed.

DLM
34
FAA Renewal Issues

• Geminis experience
• Current permission (our first not a renewal)
  valid until April Fools Day 2006.
• With our first application, the FAA (Larry
  Tonish) sent us a fairly routine set of
  questions, which we answered, after consulting
  with Jason Chin (thank you, Jason).
• They wanted to ensure that our spotters were
  going to be provided with protection from the
  weather and hypoxia.
• After answering the questions they granted us
  permission for a period of one year.
• We are in the midst of a process to obtain
  permission to operate lasers at Gemini South. The
  Chilean FAA equivalent has been very cooperative.
• Following Kecks model to collect statistical
  information on spotter data.

KB/BG
35
Spotters

• Logistics for managing aircraft spotting is
  resource intensive
• Managing spotters pool (hiring, training,
  schedule)
• Transportation safety
• Procedures and spotters logs
• Meals and equipment
• Time sheets and payment
• Kecks experience
• Two lead spotters responsible for transportation,
  training and coordination.
• Spotting procedures reviewed and re-enforced in
  Nov.2005
• Whole process is problematic because we are
  dealing w/ part-time outside resources.
• Keck use of aircraft spotters
• http//www2.keck.hawaii.edu/optics/lgsao/docs/kaon
  360.pdf

DLM
36
Spotters

• Keck has built a base of spotters from an outside
  resource
• Gemini uses the same pool of spotters
• This pool of spotters must originate from the
  Keck because of specific background checks that
  is mandatory in Kecks HR policy. Gemini does
  not have the same requirements. To keep
  recruitment of the spotters consistent, Keck HR
  has agreed to manage the initial recruitment of
  the spotters from the outside resource.
• Geminis experience
• Before assigning a spotter to a Gemini run
• They are given a safety orientation from our
  safety officer.
• They are given a general orientation for our
  laser program from AO program manager(s).
• Gemini prefers to schedule the spotters for each
  run internally. The Engineering Admin Asst calls
  available spotters from the pool (from outside
  resource) for assignments.
• Two lead spotters were recently hired to the
  Gemini staff and are assigned to every run with a
  team of 3 additional spotters from the outside
  resource. The leads are responsible for
  transportation and direction of the spotter team.
• The scheduling is not a big issue and is not time
  consuming. Most of the time, spotters call to
  request scheduling. Using the outside resource
  is an not an ideal situation. Our experience
  with the outside resource has not been a
  completely positive one.

KB
37
Boresight Camera Systems

• Gemini
• 15? fov Merlin - Indigo IR camera
• Continuous imaging real time analysis
• Aircraft detection signal sent to LIS/GIS to
  activate safety shutter
• Keck
• 10? fov Amber IR camera
• Aircraft detection automatically closes fast
  shutter through PLC within 1/30th of a second
• Can trigger on moon can be overridden

PW
38
Gemini Wide Field Camera System

• Status
• Software demonstrated
• Camera mounted on SMA roof
• Camera damaged by sunlight
• Enclosure dome inadequate - too much scattered
  moonlight
• No work on this for several months
• Plans?
• Fix the current problems
• Daytime shutter, new or modified camera
  enclosure,
• Continue with integration and testing
• Continue collaborations

CdO
39
Mosaic Radar

• History
• 07/91 Boeing FAA agreement for Haleakala
  completed
• 11/99 AFRL/Boeing development effort begins
• 05/01 SW HW integration complete Boeing
  authorized from FAA to provide UH with data
• 08/02 - Maui AF contingent tours MK, fails to
  break through political issues related to
  technical transfer of info correspondence
  essentially stops.
• Outstanding Political Issues
• AF/Boeing/FAA MOA/MOUs needed before docs
  technical info can be provided/discussed in
  detail.
• Access to FAA data may be sensitive to
  international institutions
• FAA Certification for MK system (regardless of
  technical approach)
• Existing System Technical Issues
• Blind spots, multi-target correlation, simple
  azimuth wedge avoidance cone, manual laser
  position input, shutter control integration, HW
  SW constraints, MK data access method.

DS
40
Collaboration with other Groups?

• JPL
• Keith Wilson (JPL Optical Communications Group)
  attempting to establish a consortium of
  interested parties to work with FAA on navigable
  air space safety solutions
• Next step Telecon strategy session
• Table Mountain system for day nighttime
  propagation
• 2 boresighted LWIR cameras for low flying
  aircraft
• Radar beam to detect high flying aircraft
• Exploring FAA radar interface display system.
  Next step fund prototype development
• Palomar

CdO
41
Laser Clearinghouse

• Kecks Experience
• Observer submit target list using web interface 3
  days in advance
• Still faxing target list and receiving approval
  fax
• Never got any closures on target list
• Lost 4 hours in 2005 due to sudden call for
  space events
• Received same-day approval for special requests
  GRBs and human error on main targets.
• Issues
• Still lots of coordination with observers and US
  SC effort level is 5 hours per observing
  proposal for reliable operations.
• Could it be more automated (approval email could
  work)

DLM
42
Laser Clearinghouse

• Geminis Experience
• We fax the target list and receive approvals by
  fax or email. During our November run, we
  requested approvals to be emailed to a group of
  people. We received an email both days of our
  run indicating no closures.
• Never received any closures on target lists.
• Received same-day approval for special requests
  Adding new targets or changing targets.
• Issues
• Coordination with observers and US SC runs pretty
  smoothly.
• A more automated way of submitting for approvals
  would be ideal. Submit by email or by web
  interface.

KB
43
Aircraft Satellite Safety Collaboration

• How do we want to collaborate?

PW
44
Mauna Kea Laser Policy

• Policy
• Keck Policies
• Lasers at different wavelengths
• Any reason to review policy?
• Weather

PW
45
Mauna Kea Laser Policy

• The following policy statement was approved at
  the Sept/97, Mauna Kea Directors meeting.
• The use of sodium D wavelength (589 nm) laser
  guide stars for astronomy is permitted on Mauna
  Kea subject to the following conditions
• No Observatory shall project a sodium laser
  beacon exceeding a power of 50 W. Multiple
  beacons can be projected from a single
  Observatory as long as their total power does not
  exceed 200 W. Laser beacons may not be projected
  at a zenith angle greater than 70 degrees.
• Laser beacons must not interfere with
  observations being performed by other Mauna Kea
  telescopes. Any Observatory pointing a laser
  beacon must, therefore, adhere to the observing
  coordination guidelines approved by the Mauna Kea
  Directors.
• Any Observatory projecting a laser beacon must
  receive prior approval for their aircraft system
  from the FAA. Only passive aircraft detection
  systems are permissible.
• Written confirmation that conditions 1 to 3 have
  been met by an Observatory must be provided to
  the IfA Director at least 30 days prior to the
  first projection of a laser beacon from that
  Observatory.
• Use of guide stars at alternate wavelengths will
  be permitted only after an evaluation of their
  utility and impact, similar to that performed for
  sodium D wavelength lasers, is carried out and is
  submitted to and approved by the Mauna Kea
  Directors.
• It was noted that for some Observatories that the
  use of laser beacons may require a modification
  to the indemnification clause in the Operating
  and Site Development Agreement between the
  Observatory and UH. It was also noted that a
  requirement may need to be added in the future to
  the policy statement on the subject of satellite
  avoidance.

PW
46
Keck Laser Propagation Policies

• Laser propagation restrictions procedures
• http//www2.keck.hawaii.edu/optics/lgsao/docs/kaon
  269.pdf
• Procedure for laser safety observing
• http//www2.keck.hawaii.edu/optics/lgsao/docs/kaon
  361.pdf
• LGS AO weather cancellation policy
• http//www2.keck.hawaii.edu/optics/lgsao/docs/kaon
  318.pdf

47
Lasers at Different WavelengthsCFHT VASAO
(Visible All Sky AO Concept)

• Feasibility study ongoing, to be completed by end
  of 2006.
• Could be operational around 2011-2012.
• Based on
• Pueo Hou Pueo upgrade to allow diffraction
  limited observations in visible above 600nm
  50mas resolution below.
• Two mode-less lasers at 589nm 569nm (giving
  330nm through radiative cascade)
• Polychromatic tip-tilt sensor
• Use of a 330nm laser for tip-tilt sensing (that
  would give both wavelengths at once) is also
  contemplated, though feasibility is not proven
  yet.

CV
48
Mauna Kea Laser Policy Changes?
49
Other Issues
PW
50
Next Steps
PW