1

Proton Improvement Plan

Keith Gollwitzer

May 6th, 2013All Experimenters’ Meeting

Thanks to F. Garcia for Linac slides

Gollwitzer AEM 2

Overview of Status • RFQ Largely in operations mode – But…

– Still adjusting new sources – spark rates and emittances have improved

• Second Source – with new hardware design has been tested• Linac Commissioning continues while improving

– Efficiency Improving: Up to 90% (current still lower than desired)

• Linac Beam Position Monitor system upgrade complete• Progress on developing Linac modulator for replacement/upgrade; both

in-house (AD/EE support) and by SLAC• Booster commissioning continues with many studies• Booster RF Solid State Upgrade completed• RF cavity refurbishment goes on• Progress in utilities replacement/upgrade

Linac Utilities

• Power Distribution– L1 transformer

• Continue with the prep work for the installation of L1 transformer. – Approval from FESS to

proceed - DP-18 complete

– Electrical conduit relocated to clear the area

– Quote on hand for hatch manufactured and installation

Linac L1 transformer – storage

Hatch location

• BPM Electronics Upgrade complete

Linac Instrumentation

Diagnostics Room Update existing RF Logamp electronics with

Digital electronics FPGA, ADC, Digital Signal Processing Long term stability Flexibility to modify system as needed

Linac - 200 MHz Rf Power System -1• Modulator Upgrade– 35kV, Marx-topology modulator to drive triode (or MBK)

– SLAC – Two cell test stand

Two vernier cells: ripple +/- 37VSpec:+/- 25V (F1-Marx design uses 10 main cells)

• Modulator Upgrade (cont.)– 35kV, Marx-topology modulator

to drive triode (or MBK)– AD/EE – One cell test stand– Test: Short circuit

» The Soft Shut Down circuit is used to softly shut down the IGBT if a fault occur

Contribution by: H. Pfeffer

Short circuit current1000A/

Load voltage & shortcollector 200V/

Load current 100A/

Linac - 200 MHz Rf Power System - 2

Gollwitzer AEM 7

Booster Aperture Scan

Booster Notch Beam Absorber

Last power supply/kicker system for beam notching system has been commissioned

Many Booster studiesAperture scansLattice Radiation studies

Gollwitzer AEM 8

Solid State RF Station in Gallery

New Power Amplifier

Booster Solid State Upgrade is complete!

9

Booster RF Work• Solid State Upgrade is complete

– Major benefits to reliability and the cost of operation• Refurbishment continues

– Un-certified a cavity due to RF leak

Booster Cavity WorkRefurbished (15Hz)

SS Prototype SS Upgraded

Cavity Removed

Gollwitzer AEM

10

We are now concerned about connection with outer flange

Gollwitzer AEM

Pulled one cavity and have started testing

RF leak from outer flange?

Gollwitzer AEM 11

Cavity RefurbishmentThere is always something unexpected: goop epoxy fix from some prior leak

Gollwitzer AEM 12

Gollwitzer AEM 13

Near Term Plans• RFQ injector – Will be adding a new trim package (improve transmission)

• Installing Booster Utility Transformer• Installing Linac Roof access • Booster aperture studies• Booster Cogging studies• Booster Lattice Studies• Booster Cavity Refurbishment

• Operations:– Higher Intensity Tune-up– Address shielding assessment issues to allow for higher flux