<tomono at subaru.naoj.org>

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• lttomono at subaru.naoj.orggt

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CAUTION

• Telescope is becoming unstable

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Agenda

• Unstable operation due to
• Age of mechanics and electronics
• Increased work load for new instruments
• What to expect in coming years
• Modification of telescope in summer 2010
• Commissioning of HSC in summer 2011
• Replacement for the space of AO36?

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Old mechanisms and electronics

• Troubles on POpt AGSH Probe X axis
• Problem on acquisition of star on NsIR AG
• Image rotator?
• Pointing error due to azimuth rail?
• Instability of Time Code Generator
• Old hardware for TWSs
• etc

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Work load from STN3

• Less reliable connection from home for night
  support
• Change of URLs
• .sum.naoj.org
• .subaru.nao.ac.jp
• _at_subaru.naoj.org
• Lost documents
• Transferring data from STARS

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Work load from HSC

• Unexpected increase of work load from around June
  2008
• Detailed technical questions to overcome limits
  in weight, size, and cost
• Required to manage tasks that will be done by
  engineers in Hilo and Mitaka, with coordinating
  with those done by the contractor

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What to expect in FY2009-2011

• Modification of telescope in summer 2010
• a couple of months of down time
• Commissioning of HSC in summer 2011
• a few months of down time
• Schedule and work items are still under study
• Earlier work on top unit exchanger?

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What to expect in FY2009-2011

• Replacement for the space of AO36?
• Electronics and optics for AO36 will be removed
  from the telescope in a couple of years
• The AO layer above Cassegrain focus is a good
  place for e.g.
• Better AG
• Any suggestions for replacement subsystems are
  welcome!

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Summary - our apologize, but ...

• Please expect more down time in the coming years
  despite the hard working engineers and
  technicians due to
• Troubles
• Longer lead time from additional work loads
• Work items in coming years are to be studied
• Ideas to replace AO36 are welcome

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