Transcript Current status of Subaru Telescope

Current status of Subaru Telescope
Daigo Tomono <tomono at subaru.naoj.org>
and the members of the Telescope Engineering Division
Summary
Troubles
– Some glitches are expected while leased computers are being
replaced (February 2008-)
– Age of the complicated systems requires us more work to keep the
telescope operational.
– Input from the users are always important.
– Regular seeing measurements are important to monitor long-term
variations of the environment and the telescope. We are working to
minimize time used for the measurements.
– Snow in winter 2007-2008
– Under investigation
• Displacement of top units after earthquake on Oct 2006
• Dome encoder
• Strange behavior of chillers
• Crack on man-basket on TUE
• Positioning pins on top units getting tight
• DIMM broken with falling ice
– Fixed
• Main shutters stack - with better position markers
• Wind screens tilted - with modified tensioner
• Noise on NsIR r axis - with lubrication
• AZ rail cover scratching pier - with additional beam
• Dome air conditioners - with replacing parts, gas and liquids
URLs
– http://teldiv.subaru.nao.ac.jp/
• Meeting minutes as Wiki pages
• Log files from TCS
• Subversion repositories
– Issue tracker
• http://ssdweb.subaru.nao.ac.jp:8080/ocsi/?categories=5
Continuing measurements
– Weather and seeing statistics
• Monthly updates by Miyashita
• https://www1.subaru.nao.ac.jp/~akihiko/
• http://www.naoj.org/Observing/Telescope/ImageQuality/
Glitches expected!
– Telescope engineering division would like to apologize for the
expected delay in solving telescope problems during observations
from February 2008.
– Leased computers in the Hilo and summit facilities are being
relocated
• Real-time measurements of the weather have been provided
through the leased computers and need to be replaced
• Replacement system for the services are not finalized
– Domain name of servers in Hilo facility will change from .naoj.org
to .subaru.nao.ac.jp
• URLs of huge amount of information will change
• This will delay finding necessary information to act against
telescope troubles
– SSH access to intranet might be closed
– Registration of telescope status and search on STARS will have
a pause from February 19th through February 24th.
Additional features
– Micro-crack detection system for primary mirror
• Detects drop of small things with microphones
– Interface to generation-2 `OBS'
– Quick log of status and telescope model parameters on TWS4
– Wave plate on NsIR by HiCIAO
– Optical fibers for FMOS
– SODAR measurements of turbulences (testing)
– Auto-guiding while observing a non-sidereal target (testing)
Refreshment of old systems
– Completed fixing automatic transfer switch for power outages
– Completed overhaul of rotation axis of the top unit exchanger
– Moved part of network for AG/SH images from FDDI to Ethernet
– Completed overhaul of automatic instrument exchanger (CIAX)
– Refitted cables in azimuth cable wrap
– Preparing recoating of NsIR image rotator mirrors
Tuning of existing systems
– Added oil filters under elevation axis
– Modification of TUE for LLT
– Testing brighter dome flat lamp
– Tuning off-axis SH measurement
Scheduled work items
– Annual maintenance on mechanics
– Enforcement of AZ axis after earthquake
Upgrades being planned and studied
– Recoating of IR M2 and IR M3
From Open Use Reports Feb 07-Jan 08
– Chopping signal from COMICS is not always connected
• Connection from COMICS to control building 2F is always
checked
• Reception of signal by telescope control system can only be done
by actually chopping M2
• We are investigating a safe way to confirm reception
– It would be very useful to have non-sidereal guiding implemented
for solar system targets
• We will test the new feature at Cassegrain in February 2008
• Release date to open use observations to be discussed after test
– Background at NsIR in L-band and M-band is higher than at
Cassegrain
• Image rotator will be recoated
– Auto guide on NsIR does not start smoothly
• The rotation angle will be calibrated after the recoating of image
rotator
– A webpage with daily updated list of problems would allow
observers to have contingency plans
• Good idea. We will study how we can update the page without
major impact to our work load
– A webpage with accurate assessments about overhead times
• The next generation preparation tool might be able to take care of
– Noise on NsOpt slit viewer camera is higher than the other cameras
• We are aware of the problem on AG and SH
• Investigation is taking time due to lack of man power
– Distribution of auto guide error was strange and took time to offset
telescope accurately
• There was a problem, which was fixed during the night, in
communications between the GPS clock and a control computer
January 2008: Subaru Users' Meeting