Intensity Dependent Quad Ramps

1
Intensity Dependent Quad Ramps

• We know that in order to get the most intensity,
  the quad ramps must be tuned for a particular
  intensity.
• The way this is implemented now is to have a
  separate set of quad ramps for each number of
  turns in B4. This represents an operational
  headache, and an opportunity for big scew-ups
  (e.g. going from 7 to 8 turns could result in
  pathological ramps being loaded).
• I suggest that we develop an application to
  automatically populate the quad ramp tables based
  on one, or possibly two and tuned ramps.

2
Ideas to Populate Quad ramps

• Hand tune one quad ramp (probably the high
  intensity), then populate other ramps based on
  measured intensity-dependent tune-shift.
• Pros straightforward, only requires one ramp to
  be tuned.
• Cons Only measure coherent tune-shift maybe
  not the whole story.
• Hand tune quad ramps for two intensities, then
  populate the other ramps based on a linear
  interpolation between the two.
• Pros We typically only care about two
  intensities (stacking and MiniBooNE), and this
  allows us to optimize them.
• Cons Algorithm a little more complicated. Still
  doubles the number of ramps which must be
  maintained by hand.
• Other suggestions?

3
Projects on the Table (my impression)

• Collimator Project
• Design almost complete.
• Review almost passed.
• Three secondary collimators will be assembled
  below the high bay and be ready for installation
  in the summer shutdown.
• Most of the effort (at the moment) outside the
  Booster group.
• RF Prototype Project
• Two 5 aperture cavities being constructed.
• Significant machining being done at NuMI and
  MiniBooNE universities.
• Parts rolling in, complete by end of April.
  Assembly will begin at MI-60.
• Should be ready for installation in summer
  shutdown (replace RF11 and RF15?)

4
Projects (contd)

• EDWA Magnet (Wide aperture MI-8)
• Ready for some time now
• Will take four weeks to install over summer
  shutdown.
• Vacuum upgrades
• Reggie in charge
• Power supplies being modified
• Working on controller
• Cable pulls complete?
• Finished in summer shutdown?
• ORBUMP issues
• Jim in charge
• Modifying water system and rebuilding inductors
  next few weeks
• New SCR network just upped in priority summer
  shutdown?
• New capacitors off the shelf, soon?
• New controller investigating, maybe use MP02
  design.

5
Projects (contd)

• Doglegs
• Plan to proceed with Jims anti-septum pulsed
  design meeting next week. Timescale year or
  two?
• What to do about plans for new MP01, ML01, ML02,
  etc??
• What about summer? (3 legged dog?, MI-8 dump?)
• Kickers
• Cliff Foster about to fabricate one out of spare
  ferrites with TD watching.
• New ferrite ordered.
• Eventually transfer the construction process to
  TD.
• TLM system
• Ray and Yon Liu had two prototypes in and being
  tested.
• Timescale?

6
Projects

• Various notching projects
• Resonant notching?
• Early notching (chopper at Preacc).
• Laser 37 MHz chopping?
• Where do these stand?
• Maintenance issues
• Low voltage power supplies?
• Other things which could kill us?