Notes from Feb 8, 2007 phone conference
              (recorded by Michael Richmond)

***   marks an ACTION ITEM



Deustua: DOE call for proposals for Dark Energy science
         we will submit one proposal for SNAP
         U of Indiana submitted section to create
             prototype calibration light system
             (for prototype focal plane)
             and do simulations

         DOE funding for SNAP for FY 2007 has been decreased by ~50 percent
             perhaps this will affect NIR sensor development most strongly


Deustua: I posted JWST error budget on SNAPCal TWiKi
         bottom line: they will have a tough time reaching 5 percent goal
         assumed most systematic uncertainties will be uncorrelated
 
         it would be a good idea for us to examine their methods and numbers
            as we are thinking about calibrating SNAP

         most relevant instrument is MIRI in imaging mode
         also perhaps NIRSPEC IFU

         Richmond: some of the pieces are pretty simple statistical 
                    calculations (photon noise, etc.)

         no description of methods, operations for calibration

         Richmond: could we look at similar design documents from the deep
                    past of HST?
                    Bohlin not on the line -- he might know
***                 Deustua will ask Bohlin if he knows of such documents

***      Deustua: will ask JWST team for additional documents

         in some circumstances, we might compare our plans, documents
                    to the JWST plans, documents 
                    tell reviewers "We are doing as well as JWST, so there!"

         some questions about relative vs. absolute flux calibration --
                    which is really being described in this document?
                    JWST is assuming Vega's flux is known absolutely
                       (do they work out the methods by which JWST observes
                        Vega, or a series of transfer stars?)

         
Mostek:  at U of Indiana
         recently finished calibration of InGaS (?) photodiodes
         Mostek has been writing utility classes in SNAPSim
               three classes with methods
                    adding spectral uncertainties to filters or calibration
                    adding linear error to calibration
                    adding custom error to calibration or filters

               putting filters into simulation in flexible manner


         Mostek is communicating with Gary Kushner on this work as he goes
      

Richmond: wrote some documentation on running SNAPSim 
          very very basic

***       will put document on SNAPCal TWiKi somewhere ...


Kent:    PSF characterization -- can it be handed off to Weak Lensing group,
               since they are the most interested parties?
               they will come up with requirements -- any other stuff?

         Deustua: yes, probably okay to let them do it

         the Supernova Working Group -- can they take over some of our tasks?
               they will come up with requirements
               

***      Deustua will discuss these two items the Weak Lensing leader(s)
               and Supernova leader(s)

***      Deustua will put Kim's "SN requirements" document on TWiKi
               and send E-mail describing its location

         we should invite members of these other teams to give regular reports
               to us, the Calibration Team