TF3 Biweekly Meeting

US/Central
Description
Readytalk: https://cc.readytalk.com/r/wqpn7a5fefdb&eom Meeting ID: 4608749 International call-in numbers: https://www.readytalk.com/rt/an.php?tfnum=8667401260 FNAL Location: Snakepit (WH2NE)
   Laura Fields presented introduction describing long optimized target:

     *   Main request was to plot fluxes for different target lengths

     *   Also compare sensitivity gains to extended running time

  *   Bob Zwaska and Chris Densham both presented thoughts on long targets:

     *   These and the associated discussion suggested many additions to the beam simulation task list:

        *   Study of beam spot size w/ cylindrical target

        *   Impact of Beryllium target on neutrino fluxes

        *   Energy deposition in target and how this scales w/ target length

           *   More energy deposited in horns may need additional consideration

           *   Also more energy reflected back from horn into target.

        *   Consider 2 “Numi sized” horns instead of one very long horn?

           *   Or Support target on both sides

        *   Impact of magnetic field inside target (if target is not electrically isolated for horn)

        *   Evaluation of  new alignment tolerance not considered in the past: target sag

        *   Impact of magnetic field distortions at edges of horns

        *   How do hadron production uncertainties change with long target

        *   Impact of inner conductor size

     *   Paul Lebrun suggested we implement Chris’s split target idea but needs a description of material supports

        *   Chris said he’d work on that

     *   More or less decided to go for 3 horn

     *   What is the maximum beam size

        *   3.4 mm not, but could that be changed?

        *   Beam experts mentioned 4 mm as upper limit of beam rms.  is this a hard limit.  how hard would it be to go higher?

     *   Should target/horn1A be one unit?

  *   Upcoming talks in future weeks:

     *   John Beck on spherical target

     *   Beam simulation plans talk postponed from this week

     *   Amit Bashyal on near/far extrapolation

     *   muon monitors — Alberto will contact relevant people

     *   Nikolai Mokhov on MARS

     *   Mary Bishai on older beam geometry studies

     *   Laura on new optimization plan — Oct 15th

  *   Alberto Marchionni will set agenda for next week

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