Survey Strategy and Target Selection Jim Annis Fermilab Center for ...

Field to Field (Hex to Hex) Variation3 sq-degree chunks from theBusha & Weschler DESsimulations run through atarget selection code.There are 1σ variations of~300 targets.3σ this is 300/sq-degree.A survey strategy question ishow to deal with these.On approach is to visitmultiple times or useoverlapping fields.Another approach is to havea sufficient number of fibersin a reservoir to use towhen needed. Otherwiseallocate to a secondprogram.Having set a strawman target selection and dialed the surface density to 1000 or 750/sqdegreeusing a combination of z and r-z cuts, we see the effects of large scale structure here.The survey strategy question is how to deal with this. I’d advocate the reservoir of fibersapproach.13