Proton Improvement Plan

Bob Zwaska

January 7, 2013

All-Experimenters Meeting

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 2

Summary• Preparing for beam

Most installations for this shutdown are complete:• RFQ• Linac Vacuum / Motor Control Center• Booster Absorber• Booster Solid State• Booster Vacuum & Water

• Much work to go:Linac & Booster RF systemsLoss minimization

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 3

New RFQ Installed

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 4

RFQ Status• RFQ is Installed and commissioned

November 23

• 33 mA into Linac Tank 1 – goal is 40• Used for treating patients since Dec. 11

28 mA at Tank 3

• Transverse emittances are 2x smaller than previously with Cockcroft-Waltons

• Tuning is ongoing Possibility of beam exiting RFQ at large

angle leading to losses• Correctors will be added

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 5

Linac Status • Linac vacuum and Motor Control Center upgrades performed over shutdown• 66 MeV beam has been delivered for NTF patient treatment• 400 MeV start up initiated the week of December 17

First beam to the dump Dec.18th• Commissioning continues• Efficiency still lower than expected at high energies (~ 10% lower):

Ongoing problems with LRF5 which has been running at 7% lower gradient. Significant impact on poor efficiency and high losses observed.

Phase matching is not totally optimized yet. It will help when HEP beam resumes by the end of this month

Problems with instrumentation (unprecedented behavior of the HE motor controller of the wire scanners). Wires are unidirectional. They seem not to be retrieving to the opposite position once inserted. Investigation will resume afterthe holiday break.

Nevertheless, beam was observed at the dump area. More work to cleaning accelerate and dump the beam to the absorber continues.

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 6

Booster Solid State Upgrade• Will be completed during shutdown • Major benefits to reliability and the cost of operation

To Be DoneNearly Done

PrototypeUpgraded

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 7

Booster RF Cavity Refurbishment• RF cavity and tuner refurbishment is proceeding and will continue while

running• 4/19 Cavities refurbished

To Be DoneRemoved

Being Refurb.Refurbished

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 8

Spare Cavity

Ferrite Testing

Cavity Modeling

Refurbished Solid State Cavity

Tuner Rebuild

Failed Tuner Connection

Booster RF

Repaired Tuner Connection

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 9

Booster Upgrades• Major LCW replumbing and

vacuum work also completed • New notcher and absorber

installedWill create cleaner notches in the

beam, and direct the notched beam into a controlled dump location

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 10

Booster Startup• Booster work is wrapping up this week• Startup will occur towards the end of next week• New notch absorber and RF will be commissioned• Aperture alignment and potential magnet moves will

occur• Beam studies for optics and cogging will continue• Will wait for MI & RR for high-throughput startup

In the meantime, we will test cavities for high-pulse rate

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 11

Long-Term Items• Linac RF Systems Modernization

High cost of upkeep High-risk for failure in both modulator and power amplifier Have developed an alternative klystron amplifier that solves both the above

problems• Ready to build a prototype! – addressing finance issues

• Booster RF Cavities Need to be refurbished to operate at higher rates Have now refurbished four cavities ( /19) to operate at 15 Hz

• Yet to be proven with beam• As of a year ago, it was unclear whether cavities could ever run at 15 Hz

Need at least three additional, new stations for RF control to limit losses• Provides a consistent accelerating voltage

More cavities may be needed, depending on results of refurbishment• New cavities offer the possible of reduced losses and improved performance

Refurbishing continues and design work is underway for additional cavities.

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 12

Summary• Proton Source ready for startup

Numerous PIP upgrades during the shutdown There was additional non-PIP work (not covered here)

• Should experience immediate operational improvements from: RFQ Linac and Booster utilities Solid-state upgrade Notch Absorber Four refurbished cavities

• Work will continue RF systems are the major focus Several activities to decrease losses / increase intensity More utility / reliability work is pending

Jan. 7, 2013Bob Zwaska

All-Experimenters Meeting 13

Proton Improvement Plan

Bob Zwaska

January 7, 2013

All-Experimenters Meeting