# Presentation: 402155

## Booster Status

- Eric Prebys
- FNAL Accelerator Division

## Recent Booster Activities

- Collimators are now used in regular operation
- We have seen a reduction in Booster activation
- We are raising the rate (Watt limit) to try to keep activation more or less constant.
- Currently at 475W
- Need to go to ~575W to run full MiniBooNE during shot setup
- Need to go to 650W to run full MiniBooNE at all times.
- We’ve hit a max of 8E16 pph to MiniBooNE
- We have now raised the administrative limit to the point where it’s no longer a concern.
- We regularly run at the 6.5Hz booster rate needed to go to full MiniBooNE intensity
- Need only go to 5E12 protons per batch to hit full intensity.
- Wrestling with collimator problems for the last week
- Good news: NOT stuck (problem in the controller)
- We *think* it’s fixed
- Note: Bill Pellico won an Employee Recognition Award (I’m sure the collaboration’s letter helped)

## Proton Demand – History (Shown to PAC)

- Have now exceeded initial NuMI needs!!!!

- 7.5 Hz

## Activation History In Booster (Shown to PAC)

- MiniBooNE

- 16x proton increase

- x2~3 activation

- Collimators

## Change In Activation Since Collimators – Shown to PAC

- Collimatorregion

- RF Region

- L13Extraction

- L3 Extraction

## Activation in RF Cavities

- MiniBooNE

- Collimators

- Pre-MiniBooNE levels!!

## How far have we come?

- Typical:
- 5.5E12 protons/batch to stacking (Run II handbook = 5E12)
- >6.5E16 pph to MiniBooNE (MiniBooNE goal 9E16)
- 9E18 p/wk (MiniBooNE nominal 12.5E18)
- Records:
- >6E12 protons/batch to stacking
- 8E16 pph to MiniBooNE
- 10E18 protons/week

- Time (s)

- Oct. 2002 (MB turn-on)

- Jan. 2004

- Energy Lost

- Charge through Booster cycle

- Now

## Effect of increased intensity (recent running)

- Energy Lost per proton

- Protons per pulse

- 4E12

- 5E12

- ~5% more losses (activation) at 5E12

- Can really deliver 5E12 efficiently for the first time!!!!!

## Making Projections (shown to PAC)

- “design”

- Conservative

- Stretch

- 7.5 Hz

## Protons to MiniBooNE (shown to PAC)

## Comments on Pack Meeting

- Things I said (for the first time):
- We have demonstrated NuMI intensities.
- I believe we will demonstrate full MiniBooNE instensity soon.
- I believe we can run the 8 GeV line at some level when NuMI comes on.
- General impression:
- Committee was impressed and supportive
- Want to see “design goal” expanded to include estimate of effects of shutdown work
- “Stretch goal” should disappear

## Near Future

- Will discuss Watt limit tomorrow
- Probably raise to 525W
- Trying to find and optimum collimator configuration that achieves adequate loss reduction around the ring with the minumum increase near the collimators.
- In the near future, will at least demonstrate full MiniBooNE intensity.
- Still hope to hit full intensity soon.

## Shutdown Prep

- Long 13 dogleg work
- On track
- Will begin after 4 weeks of cooldown
- Expect big improvement
- RF work
- On track for a 19th cavity and prep for a 20th
- Kicker work
- Move period 9 girder to period 5 and rotate horizontal kicker to vertical
- Notch losses in less sensitive area
- New vertical kicker helps *both* extraction regions
- On track
- Alignment
- Align RF cavities (requires new moving hardware)
- Complete 3D laser-tracker as found (on track?)
*Maybe* to horizontal moves after a period of running
- 400 MeV line:
- Don’t rock the boat!

## Gates Status

- Shutdown ~13 weeks
- Major Booster tunnel work
- Long 13
- 4 weeks cooldown
- 2 weeks for project
- RF work
- Tunnel: should be done in 6 weeks
- Upstairs: full preventive maintenance. Time: ?
- Possibility of gates to let MiniBooNE get some beam before end of shutdown??
- Problems:
- Recycler work planned in gated area through most of shutdown
- Already 30 technicians short.  If resources can be found to install gates, they should be used to shorten shutdown.
- Booster RF schedule and turn-on needs still unclear.  Can’t make beam promises.
- AD Conclusion: no gates.
- And now, on to Dave...