Notes - Instrumentation/beam physics meeting - Feb 23, 2005

Notes and associated presentations can be found in document 1337.

Agenda:

   1. Recycler flying wires - Martin Hu
   2. Tev flying wire OAC and dispersion functions - Nate
   3. Synclite - Randy
   4. Tev SBD - Stephen


Action Items:

  RR flying wires

   1. Put the wire heating calculation for RR flying wires into
      doc database
   2. Understand charge number discrepancy.

 Tev FWs

   1. Is the scale wrong on the Tev flying wires?
      Why is the dispersion as measured by Nathan so much different
      from what Valeri ( and design) say? Are old data sufficient
      or should there be a study plane with three bumps?  Certainly,
      the wires should be flown in conjunction with Valeri's lattice
      measurements - this can easily be done as part of shot setup.

   2. Fix final details in OAC.

   3. Continue studies so wires can be flown every hour during a
      store.

 Synclite

    1. Get pbar motion into the sequencer - done!

    2. Figure out/fix (new camera?) Pbar intensity distortion.

Details:

  1. Recycler flying wires - Martin Hu

      Martin's slides are included in Doc 1337.  People were very
      interested in their calculation of wire heating, and
      Martin agreed to put the calculation in the document
      database.

      The flying wires are working very well and are very important
      when the Schottky measurements don't work due to momentum width.

      The Schottky detector is well calibrated using mechanical
      scraping of the beam.  FWs and Schottky agree very well  - The
      disagreements occur when the beam is non-Gaussian.

      Thee are two ways of getting the charge number of the wire:
      energy loss and emittance growth.  They disagree by 50%(?).
      Martin is currently trying to understand this discrepancy.
      There are uncertainties in the material and density of the wires.
      There were several suggestions from people at the meeting.
      Unfortunately the aperture of the RR doesn't allow flying the
      wires 100's of times. and the lifetime is so good that the
      lifetime(intensity loss) can't be measured well enough.

  2. Tev Flying wires

      a. OAC

         Calculations were off at injection because the energy
         was 120 Gev - fixed

      b. The wires have been flown during stores and results are
         encouraging.  The ion pump trips ( they are the ones at
         the flying wires) are an ongoing mystery.  They apparently
         only happen when there is beam in the machine.

      C. lattice parameters and Dispersion measurement

         Nathan calculated the dispersions at the fW locations
         based on data taken Feb 3, 2005.  The centroids are
         recorded before and after a small change is made to the
         RF.  He gets numbers that different from Valeri and the
         design numbers:

                    Design      Valeri      FW
         150        2.83        2.88        1.66
         Low beta   2.03        2.71        1.63

         Nathan showed a plot E11 H and V emittances for the steps
         in a store using the Valeri lattice parameters and the
         design parameters.  He used the design dispersion numbers
         for both.  Valeri commented that until we get the new BPM
         electronics, we won't know the lattice parameters to better
         than 10-20%

         There was discussion about a possible (complicated) scale
         problem  in the FW measurements.  If the
         wires are flown when Valeri makes his lattice measurements,
         one might get some clues.  He changes 4 correctors, 2 in each
         plane.  Stephen would like to do 3-bumps, as two ways to
         get what should be the same answer can be useful.  There is old
         data that can be looked at again.


   3. Prize winners: Bob F., Alan H., Mike C., Stephen, Paul Lebrun

   4. Sync Lite - Randy

        a. Randy has discovered that the distortion he observed
           in the pbar synclite during the store is an intensity
           effect.  The camera may be dying.  He is waiting for
           new cameras from the manufacturer.

        b. The pbar mirror will soon be moved in every store.

   5. Longitudinal blowup and the AGI, SBD, phase monitor - Stephen

        1. Stephen showed two plots - see instrumentation elog
           for Saturday, Feb 19, 23:01 - that show the effect of the
           longitudinal blowup problems in the various instruments.

           My notes are remarkably unclear here.