Agenda for 08 Feb 2006 SWMD Telephone Meeting

1. ESA test beam dates: 24-Apr-2006 - 08-May-2006 (proposed)
   To decide today who attends/when - further details. (From previous discussions by email, suggest several people for run period itself, and Carl+Luis for ~2 weeks prior to 25 Apr.)
   

2. Material damage
   • Luis - Comparison of various spoiler properties - Supporting plots: 1 - 2
   • Compilation/comparison of Geant4/Fluka/EGS results Adriana
   • George - stress animation
   • TTF possibility from discussion with Mike Seidel/Nick Walker - Roger J.
     3mm is the thickness of the sample they have been using at TTF, the transverse (exact) dimensions will be sent by a DESY engineer. The goal (from a TTF perspective) is to distort the beam not too much by the target in order to keep rad. safety people happy; the energy deposition is roughly constant as function of depth as long as the thickness stays below ~0.4 rad lengths. Above that a shower is developed and the energy loss rises strongly. My understanding is that a common concept for the collimation system is to use thin spoilers in combination with absorbers that can take the blown up beam. Therefore at TTF the hope is to make an experiment that concentrates on thin targets. Is this OK for us? The samples that you showed me looked larger. Perhaps we can still gain useful info from the exp nonetheless? What do you think? Also, the energy is 450MeV, the bunch charge 1nC (max 3nC) after installation of another module next year up to 1GeV is expected. The jig is moved remotely as well as the separation valve; exchange of the jig/samples has to be done manually.
   • Planning for experimental tests - discussion and plans to make proposal - see also Single pulse damage in copper, Marc Ross et al, paper at LC'00
   
   
3. Wire/bench test preparations

4. Higher order wakefields in Merlin

5. Wakefield simulations
   1. Comparisons with e.g. ABCI? - plots
      
   
   
6. Progress for ESA tests
   1. Progress on collimator jaws 5-8
   2. Event reconstruction code, evolving!
   
   
7. Future plans
   • Further runs at ESA in (US)FY07? Need simulation results.