# Presentation: 287379

## Experimenter Contributions to Booster Improvements

- Eric Prebys
- FNAL Accelerator Division

## General

- The Booster has exceeded the Run II handbook specification for protons to the pBar target
- Slip-stacking the only thing left for Run II
- Challenges come from neutrino program
- The present MiniBooNE and near future NuMI experiments depend critically on the performance of the Booster.
- When these experiments were initially approved, there was *no evidence whatsoever* that the Booster could meet the need.
- Luckily, the experiments came to understand this, and have provided and continue to provide valuable help:
- People (studies, calculations, general help)
- Fabrication (hardware, machine shop time)
- Money (well, yeah)
- “Advocacy”  (very important)

## Challenges in the Booster

- Repetition Rate
- Injection system
- Extraction septum
- RF system
- Peak Intensity (batch size):
- RF
- Tuning
- Transition
- damping
- Beam loss
- Tuning
- Lattice Improvements
- Beam control
- Collimation
- Above-ground radiation
- Calculation
- Shielding
- Work area re-classification
- Multi-batch issues
- Beam cogging
- Reliability and Basic Understanding
- Monitoring
- Analysis

## Proton Demand

## Early Contributions from MiniBooNE

- Shielding and Loss Calculations:
- Eric Zimmerman (Colorado U)
- Randy Johnson (U. Cincinnati)
- Goeff Mills (LANL)
- Dipole Corrector Studies:
- Jocelyn Monroe (Columbia)
- Morgan Wascoe (LSU)
- Linda Coney (Columbia)
- General Booster Studies
- Adam Malik (LSU)
- Linday Coney (Columbia)
- Jocelyn Monroe (Columbia)
- Total loss monitors
- Yan Liu (U. Michigan)

## RF Prototype Cavities – it takes a village

- Originally planned to build one large-aperture RF cavity based on a proton driver R&D proposal
- With the help of university machine shops, we were able to build *two* at a much lower price that one would have cost:
- Princeton (MiniBooNE)
- CalTech (NuMI)
- Columbia (MiniBooNE)
- Tufts (NuMI)
- Indiana (MiniBooNE)
- U. Texas,  Austin (NuMI)
- University Coordination:
- Doug Michael (CalTech)
- Chris Smith (CalTech)
- Bill Sands (Princeton)
- Construction an unmitigated success
- All parts delivered on time
- NO mistakes.
- One cavity will go in this fall and another in 2005 (as 19th and 20th cavities)

## Fall 2003 Shutdown Work

- Collimator System
- Initial collimator design abandoned as unworkable in late 2002
- Aggressive new design in 2003
- Larry Bartoszek, chief mechanical engineer (MiniBooNE)
- Installation originally cancelled for 2003 shutdown
- Columbia rescued it with a $300K loan.
- Dogleg modifications
- Indiana provided a $100K loan to complete some of the miscellaneous installation and magnet work.

## Current Projects

- Booster Cogging
- Needed for both NuMI and pBar multi-batch operation
- B. Zwaska (NuMI, U. Texas, Austin/FNAL Accel. PhD)
- Booster Ramp Monitoring
- Monitor and alarm ramped devices
- Ami Choi (MiniBooNE, Columbia)
- Booster Rad Robot
- Use a robot to monitor both real time loss and activation in the Booster
- $35K NSF grant through Columbia
- Dave Schmidt (Columbia) working on software

## Successes

- MiniBooNE (15x protons)

- protons

- Raw Activation

- Normalized activation

- collimators

## Activation (since collimators)

## Recent Records

- Protons per pulse: 6.06E12 (Run II=5E12)
- Protons per hr to MiniBooNE: 7.5E16 (80% MiniBooNE goal)

## Some Comments

- If experiments depend critically on accelerator performance, it’s vital that experimentors get involved.
- The contributions from MiniBooNE and NuMI have been very important to the Booster, but...
- Most of the work has come from the lab, both from the proton source department and other departments, who have not been thanked here.
- While on the topic of “outside help”, I should mention Argonne (Jim Norem, Kathy Harkay, Jeff Dooling):
- Transition work
- $$ for dogleg modification.