[BTeam] CEBAF Status and plan overview for the remaining week.

[Arne Freyberger]

Colleagues:

Today the RFpower staff is recovering as much of the RF system as 
possible in preparation for scaling the  machine to 2.0GeV/pass 
(1GeV/linac).   In parallel, the injector experts are investigated if 
the beam instability is sourced in the injector.  The OTR on the 
spectrometer dump shows some energy instability and this might be the 
source of our CW woes (https://logbooks.jlab.org/entry/3279059).   A 
download file, scaled from the all-save from this morning has been 
downloaded in the magnets.   If  we're linear this should be a good 
place to start the 2GeV/pass setup.

With that said, it is hoped that the 2GeV/pass beam setup will start 
during Swing shift and continue through to Swing on Tuesday.   It is 
hoped that Supplemental LASO support will terminate before Swing 
Tuesday, but just in case I've filled out the shift schedule up to 
Thursday Day.

The program over the next for days are (in priority order):

 1. E>6GeV to Hall-A dump with target in place, events recorded and
    tune-mode beam (*MUST*)
 2. Try CW again (assuming the source in the Injector has been
    identified and repaired) and establish maximum supportable CW
    current up to 100uA.   The hall has no need for this anymore, as
    they are warming up their target.  This test is just for us to learn
    what other limits are out there.   Spend at most 8h on this. (SHOULD)
 3. Beam optics measurements to document this setup.  I am working with
    Todd to create the list of measurements.   This will be the focus of
    our efforts Wednesday/Thursday.  (SHOULD)
 4. If time is available work with the Hall-A to support any remaining
    commissioning activities.   The major item on the list would be the
    Moller commissioning which requires that they get a bipolar supply
    for the Moller quad. (SHOULD)


If we have achieved item 1 by Friday 6am,  beam will be terminated.   
Otherwise the  beam program can extend until item 1 has been achieved.   
Hall-A has been informed that they will not be receiving beam after the 
April Down as we will be focused on the 5.5pass spin-up and 
optics/scaling measurements.

Cheers,
Arne

  Day Name               Date    Owl  DAY          DAY            Swing       Swing
                                      LASO         Supplement     LASO        Supplement
-------------------------------------------------------------------------------------------
  Thursday               Mar-27       S. Zhang     M. Spata       Y. Roblin   M. Tiefenback
  Friday                 Mar-28       M. Stutzman  A. Freyberger  C. Tennant  T. Satogata
  Saturday               Mar-29       V. Morozov   J. Benesch     D. Douglas  G. Krafft
  Sunday                 Mar-30       J. Grames    A. Freyberger  A. Hofler
-------------------------------------------------------------------------------------------
  Monday (1000MeV/pass)  Mar-31       M. Ahmad     Everyone       S. Benson   M. Tiefenback
  Tuesday                Apr-01       J. Benesch   T. Satogata    Y. Wang     A. Freyberger
  Wednesday              Apr-02       B. Terzic    Y. Roblin      A. Bogacz   M. Tiefenback
  Thursday               Apr-03       S. Zhang     G. Krafft      F. Lin      A. Godot
  Friday                 Apr-04       NA                          NA

-- 
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab
12000 Jefferson Avenue      Cell: (757) 876-6289
Postal Suite 19             Email:  freyberg at jlab.org
Newport News, VA 23606

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