# Presentation: 134968

## Proton Plan Status September Report

- Eric Prebys

## Agenda

- Operations Report – E. Prebys
- Technical Progress – E. Prebys
- Reaction to Director’s Review - Prebys
- Status of Baseline – J. Sims
- Stage 2 – M. Syphers

## Operations Report

## Operational Issues (NuMI)

- Need to balance needs of stacking with needs of NuMI*
- pBar accumulation is optimized by increasing Main Injector cycle time (from 2.2 to almost 5 seconds) as the stack grows to accommodate stack tail cooling in the accumulator.
- The NuMI proton rate is inversely proportional to this cycle time.
- A number of solutions were considered
- Status quo (pBar driven)
- Fixed 2.2 second rep rate with reduced proton intensity to pBar
- Fixed 2.2 second rep rate with reduced ARF1 bucket size
- (Jim Morgan) When the stack reaches 100 mA, increase pBar cycle time to 4 seconds and insert a NuMI only cycle in between.

- See D. McGinnis, BEAMS-DOC-1941-v1 for detailed analysis

## NuMI/pBar Optimization

- Conclusion: crossover method best compromise.

- Reduced protons

- ARF1

- Crossover

- “Normal”

- Stack

- NuMI

## Operational Issues (MiniBooNE)

- Because of emphasis on stacking and NuMI turn-on, operations had adopted a policy of controlling MiniBooNE protons by lowering batch size, rather than rep. rate.
- Resulted in undue strain on Booster and horn
- Worse tuning overall
- Sent message to all operators specifying
- MiniBooNE batches should ideally be the same as NuMI, and at most one turn (.5E12) lower.
- Both should be tuned as high as possible
- MiniBooNE rate should be set as high as possible by adjusting their rep. rate in the TLG
- Reminded operators that MiniBooNE intensity is *extremely* sensitive to how close we run the Booster to its limits (10% can be a factor of two to MB).
- This had a very positive impact on MiniBooNE beam delivery

## Total Hourly Proton Rate*

- “Run II Style” tracking plots available at http://pfdg5.fnal.gov/~derwent/protons/ProtonPlots.html  (courtesy Paul Derwent)

## Beam to NuMI

- Caught up from target problems!

## Beam to MiniBooNE

## Technical Progress

## Progress

- Technical Progress
- Linac
- 1.01.01 PA Vulnerability –
- Orders placed for 12 tubes
- First two to arrive next month
- Stage 2 (Thales test stand invenstigation) started
- Booster
- 1.02.01 Determine rep. rate limit
- Much better understanding of rate limitiations
- Uncovered vulnerabilities in our power distribution
- Implementing initial suggestion (1.02.12)
- 1.02.02 Orbump (+ 400 MeV line) –
- Four magnets “complete” (need three)
- Taking advantage of delayed shutdown to optimize shim design (cancel quadrupole moment)
- Girder contract out
- Beamline design complete
- Would have been ready for Oct 31 shutdown, but still a bit relieved.

## Progress

- Booster
- 1.02.03 Correctors –
- Modified design slightly to accommodate recommendations of internal review (more powerful quads)
- Proceeding with full prototype
- Schedule for “Fall 2007” shutdown, but probably cannot make Summer 2007
- 1.02.05 Gamma-t system
- Ongoing studies look encouraging
- Calculations and models showed potential benefit for Gamma-t + 30 Hz
- 1.02.06 30 Hz
- Decision bundled with Gamma-t
- Delayed shutdown may delay final decision on both
- 1.02.11 Booster Dump Relocation
- Design complete
- Went with “alternate” design (kickers where shield wall is now)
- Finalizing beam dump limit numbers with rad safety.
- Would have been ready for Oct. 31 shutdown.
- 1.02.13 Booster RF/ Rep. rate Improvements
- Purchasing 15 Hz transformers to address a vulnerability identified in 1.02.01

## Progress

- Main Injector
- 1.03.01 Large Aperture Quads –
- Delayed shutdown means all quads will be complete
- Whether all get installed will depend on time/manpower considerations.
- 1.03.02 Collimation –
- MI-8 Collimator construction moving ahead.
- Will go in in shutdown
- Working on conceptual MI ring collimation
- 1.03.03 NuMI MultiBatch Operations –
- Regularly deliver 5 batches at (Total 2.1E13 protons) to NuMI target
- Aim to start slipstacking mid-2006
- 	  Studies
- 1.05 Proton Study Group–
- No real progress
- Now that reviews are over, should start up in earnest.

## Director’s Review

## General

- A Director’s Review took place August 23-25th
- Ed Temple chaired
- In general the review went pretty well:
- Very supportive of the Run II style “campaign” approach, and our use of the Run II expertise.
- Were impressed by the amount of work that had been done over the last year.
- We were aware that significant parts of the plan were not ready to be baselined, but we (and the committee) realized that it will always be a “moving target”.
- Made it clear that in many ways we will be held to a higher standard than Run II.
- Final report available at:
- http://www-accel-proj.fnal.gov/Proton_Plan/Reviews/Dir_Rev_8_23/Closeout_Report_Final_08_05.pdf(on Proton Plan public webpage)
- Most significant criticisms:
- Design handbook far from complete.
- (related) The need for a table of parameters, along with the specific relationship to individual tasks.
- Our highest priority right now,  in terms of planning
- Wanted some key decision points spelled out more clearly in the plan (e.g. slip stacking backup plans)

## (Selected) Recommendations and Responses

- Linac
- Consider stationing an RF engineer remotely at Burle to help ensure successful and timely production of 7835 tubes.
- I thank everyone for their diplomacy and restraint when this was presented.
- Aggressively pursue testing of new Burle tubes as they arrive at FNAL
- Will probably require 1-2 electrical techs.
- Pursue in parallel the LANL/Thales option right now.
- Stage 2 committee working up plan.

## Recommendations and Responses (cont’d)

- Booster:
- Improve modeling of injection
- Will be easier and more accurate with new injection girder
- Examine possibility of grouping corrector elements for some multipoles
- We will look into this, but it is a fairly modest cost savings on the scale of things
- We will use the fully powered version for our cost estimates
- Will make a final decision some time next year
- (to lab management) Proceed with corrector upgrade
- Maintain R&D into gamm-t/30 Hz (reversed internal review recommendation), but specify how decision is to be made
- We’re working on this as part of are “parameter list” initiative
- Directly address slip stacking beam physics issues (combined Booster/MI recommendation)
- For the moment, this is being addressed by pBar RRT
- If significant projects are indicated (e.g. Booster RF feed forward system), we will incorporate it into the plan with change control.
- Install 19th cavity in Booster ASAP and consider restoring 20th cavity to the plan
- Strongly agree
- 19 not “officially” part of the plan
- Evaluate cost/benefit of solid state RF system and make a decision soon.
- Working to do this

## Recommendations and Responses (cont’d)

- Main Injector
- Improve beam modeling (paraphrases several specific recommendations)
- We agree.  Tim Berenc has been assigned to this more or less 100% for the near future.
- Proceed with MI-8 Collimation system
- Increase effort on loss characterization and MI ring collimation design
- Management
- Numerous recommendations, mostly already implemented
- Try to fill org. chart with non-placeholder names
- Being done
- Consider giving Project manager more control of contingency than in the PMP below a certain threshold
- Question for directorate.