# Presentation: 880775

## Proton Plan Status April Report

- Eric Prebys

## Agenda

- Shutdown/Startup  – Prebys
- Technical Status - Prebys
- Cost/Schedule Report – Sims
- Corrector Project - Drennan

## Shutdown and Startup

## Review of Major Shutdown Work

- Re-routed 400 MeV Line

- Injection Girder

## MI-8 Dump Line

- Relocated Septum

- Dump

- New Dump Line

## MI-8 Collimator

- Note marble cladding

## Main injector large aperture quads (7)

## Other Proton Plan Shutdown Projects

- Booster 13.8V transformer and switch gear upgrade:
- Recommended for reliable 9Hz operation
- New system will go to 15 Hz
- Water routing for eventual corrector upgrade
- RF cavity drift tube cooling complete
- MI-10 kicker upgraded with new load and cooling to handle high rep. rates needed for NuMI slip stacking.
- Lots of useful low level RF measurements in the Linac.

## Major non-Proton Plan Work

- Booster Sump rerouting
- RF
- Significant maintenance work, including recovery from “water incident”
- A/B switch installed so cavity 19th cavity can be used as a proper spare.
- Time with at least 18 working cavities should go from ~80% to >95%.
- 400 MeV Line power supply upgrade:
- Replace unreliable Power 10 supplies with more robust Lambda supplies (good idea)
- Replace custom CAMAC controller with Allen-Bradley PLC (jury still out)

## Acknowledgements

- This shutdown ran like clockwork thanks to the work of countless people in the Proton Source, Main Injector, Project Support, Mechanical Support, and EE Support Departments, as well as Technical Division and the AMG.
- We’d also like to thank Safety for working with us to insure that we had everything in order for an efficient sign-off.
- As usual, Operations has played a big role in our smooth turn on.

## Booster Startup Summary

- The good news:
- It appears we didn’t do anything stupid
- Timeline (note, we worked around daytime tunnel work):
- Friday 5/12
- 19:00 - First attempt at 400 MeV beam
- 21:00 - Beam to injection toroid
- Saturday 5/13
- 02:00 – Beam through ORBUMP into Booster
- 05:00 – Beam around Booster
-  Sunday 5/14
- 02:00 – DC beam for up to 33 ms
- Tuesday 5/16
- ~19:00 – Accelerate beam and extract.  Get beam to new septum on first extraction attempt.  Fail to hit new dump target in several hours
- Wednesday 5/17
- 15:00 – After correcting for a miscalculation in the required septum current, establish beam to new dump!
- Currently
- Tuning and optimizing
- Demonstrated 3E12 proton batches with reasonable efficiency

## Understanding ORBUMP

- Saturation of the central magnet:
- Causes a net integrated dipole moment (like a one bump).
- Measurements were inconsistent, but it’s on the order of 1%, which could cause a 4 mm closed orbit distortion as ORBUMP slews down.
- Doing measurements with various current shunts on end magnets to calculate the optimum shunt to cancel effect.

- End to end mismatch:
- Causes a lateral displacement (like a single dogleg)
- Measured to be .4% with an imbalance toroid.
- This should cause a maximum of 0.6 mm closed orbit distortion.
- Can cancel it by modifying stripline to increase inductance.

## MI Startup Summary

- Monday 5/22
- 1630 – Circulating Beam in MI on first shot!
- Tuesday 5/23
- 1400 – Beam to 120 GeV flat top
- Discovered problem with regulation of new quads, since fixed.
- Wednesday 5/24
- 2200 – Beam to 150 GeV
- Currently
- Tuning MI-8 line and MI
- MI-10 kicker upgrades seem to have worked.

## Technical Status

## Major Elements

- Linac (1.1)
- (1.1.1) Reliability
- Bad 7835 (of the 12) returned for checkout.
- (1.1.4) LEL LLRF (Improve phase and amplitude stability)
- Shutdown characterization studies complete
- (1.2) Booster
- (1.2.3) New Corrector System
- (See Drennan’s talk)
- (1.2.4) 30 Hz Harmonic
- Waiting to de-scope
- (1.3) Main Injector
- (1.3.2) MI Collimation Systems
- MI-8 collimator completed in the shutdown
- Will review ring collimation scheme in June
- (1.3.4) MI RF Upgrade
- Studies continue

## Revised Projections

- We are working to revise projection in preparation for the next Director’s Review
- The biggest correction is for the benefit from NuMI slip stacking:
- Originally assumed that we began to implement slip stacking gradually over a year following this shutdown
- Now assume we do studies over the next year, but don’t get any benefit from slip stacking until after collimation and/or RF improvements in the 2007 shutdown, but then it only takes three months to ramp up.
- These new projections were presented at the AAC review.

## Long Term Projections

- These projections do not take in to account effects of collider turning off or possible improvements thereafter.