# Presentation: 728892

## Proton Delivery

- Because MiniBooNE is off

## General

- The new Booster corrector system will have dramatically enhanced capability, however...
- We are installing it at a time when there is great pressure to keep the machine running reliably for Run II and NuMI - neither of which will benefit in the short term from the improvements.
- We could easily waste a lot of time commissioning the new system
*It’s vital that we bring up the new system in a way such that it can be operated in a way very similar to the existing system*
- This means ignoring some of the new capabilities
- We can worry about taking for advantage of the new features later.

## Important Differences between present (465) and new (473) ramp Modules

- Update rate:
- 465:  10 kHz
- 473:  100 kHz
- DC Offset:
- 465: not available on the module; implemented in hardware for quads.
- 473: implemented within the module.
- MDAT:
- 465:  can load up to two lookup tables based on MDAT inputs
- We do not use this feature at the moment
- 473: not implemented in the prototype
- Do we want it?

## Trim Dipole Control

- Now:
- Low beta points (B:VSn, B:HLn)
- Constant DC level
- High beta points (B:VLnRT, B:HSnRT)
- Controlled by individual 465 ramp modules
- After 2007 Shutdown:
- All long sections (B:VLn??, B:HLn??)
- Controlled by individual 473 ramp module
- Short vertical trims (B:VSn)
- Constant DC level
- Short horizontal trims (B:HSnRT)
- Controlled by 465 ramp modules
- After 2008 shutdown:
- All trims (B:VSn??,B:VLn??,B:HSn??,B:HLn??)
- Controlled by independent 473 ramp modules

## Trim Quads and Skew Quads

- Now
- All quads and skew quads have individual DC levels (B:QSn, B:QLn, B:SSn, B:SLn).
- On top of this a common ramp is added (in hardware) for each type of quad
- B:QLRMP, B:QSRMP, B:SSRMP, B:SLRMP
- Note: each of these types actually has four ramped controllers, but these are always controlled in unison as one pseudo-device
- After 2007 shutdown:
- All long quads and skew quads will have dedicated 473 ramped controllers
- Individual DC levels are now implemented within the module, rather than with a hardware sum.
- Short quads and skew quads remain as they are
- After 2008 shutdown:
- All quads and skew quads will have dedicated 473 ramped controllers

## Sextupole and Skew Sextupole

- Now
- Odd short sections only
- Sextupoles controlled by single ramp (B:SEXTS)
- No individual DC control
- Correct horizontal chromaticity
- Long sections 4, 10, and 18
- Sextupoles (3 in each section) controlled by a single ramp (B:SEXTL)
- No individual DC control
- Correct vertical chromaticity
- Long sections 4, 5, 6, and 7
- Pairs of normal and skew sextupoles
- Controlled in pairs by DC levels (no ramps)
- B:SEXL4 = normal 4 and 7
- B:SEXL5 = normal 5 and 6
- B:SEXL6 = skew 5 and 6
- B:SEXL7 = skew 4 and 7
- Used to cancel 6.667 resononces
- After 2007 shutdown
- All long sections will have individually ramped normal and skew sextupoles
- After 2007
- All sections will have individually ramped normal and skew sextupoles

## Affected Applications

- B2: Injection Parameters
- B6: Aperture scan bumps (do we still use this?)
- B11: All the individual trim parameters
- B14-16:  465 ramp control
- B71: Harmonic params
- B75: Aperture scan program
- B76: Harmonic corrector
- B80: Closed orbit
- B82: Ramped 3-bump
- B93: Beta bumps (probably obsolete?)
- B121: Booster tune scans (still used?)
- Others?

## Topics for Discussion

- By now, Booster tuners have a “feel” for what a particular current change means for both dipoles and quadrupoles:
- This will be very different for the new corrector system.
- Is this important enough to consider defining a new unit (“old_amp”?) to make things look and feel like they are now?
- In the case of the DC elements of the QUADS and DIPOLES, can we simply redefine the device names in such a way that we can leave the parameter pages alone?
- Is it too much to hope this might also be done with the time slots of the ramp cards?
- Is there any problem generalizing the B:QLRMP, etc meta-devices to set 24 ramp cards, rather than 4 as they do now?
- How much work is involved in generalizing the B14-16 ramp control devices to handle the 473’s and who will do it?
- How are we going to deal with sextupoles in the new scheme?
- Could emulate existing system, but no particular reason not to go immediately to a more accurate set of harmonic corrections.
- How do we proceed and who will be in charge?