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Intensity Dependent Quad Ramps

Intensity Dependent Quad Ramps. We know that in order to get the most intensity, the quad ramps must be tuned for a particular intensity.

emery-marsh
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Intensity Dependent Quad Ramps

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  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 (cont’d) • 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 (cont’d) • Doglegs • Plan to proceed with Jim’s “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?

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