the cockcroft institute of accelerator science and technology uknf rf: status cockcroft institute...

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

UKNF RF: Status

Cockcroft Institute(Dept. Engineering, Lancaster University, UK)

January 2007

Rebecca Seviour

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

ObjectivesObjectives

• Complement the US research programme

• Investigate surface topology & Chemistry• How preparation effect topology & Chemistry• Try to determine reproducibility• Try to determine which dominates performance• Investigate alternatives to Electropolishing

• Modularised approach

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

…… positively impressed by the systematic and scientific approach

… considers [this activity] to be very important it deserves continuous and increasing support.

Junji Urakawa KEK; Roland Garoby CERN; Ilan Ben-Zvi BNL; F. Willeke DESY

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

• WP4 – still waiting decision

• FP7 – CERN SCRF Facility - SCRF Research (CARE)

- Novel Acc Systems- MUON Cooling

• UK NF RF Collaboration (Establishing)- Cockcroft/ IC/ Brunel

StatusStatus

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

UK NF RF Collaboration UK NF RF

Collaboration

Shell Manufacture

- OFHC Cu Spec 101 vs 103 !!

- fabrication Technique - Spining - Hydroforming

- Welding- EBW- TiG- Laser Welding- Position of Weld

- Port pulling

- Tuning system

- Cooling

Surface Prep & characterisation

- Electropolishing- Different chemical Specs

- Auger- Develop statistical map of impurities

- Topology Mapping (AFM)- Develop statistical map of defects

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY(Defects)

(Defects/Surface)

(Shape/Defects/Surface)

Elctropolishing

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

201 MHz CavitySimulation

201 MHz CavitySimulation

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

Issues:Quality of E Beam

weld

Issues:Quality of E Beam

weld

EB vs TIG

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

Plasma Spots Hot Spots

(2004)

Cracking

Field Emission

Workshop on High Gradient RFArgonne National Laboratory

October 7-9, 2003 Issues:Surface Finish

Issues:Surface Finish

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

Electro PolishingElectro Polishing

Pump(0-1 L/min)(Need)

Heat Exchanger

DC Supply (0-32 V, 0-300 A, ripple ~35 mV (rms))(Need)

+ R. Rimmer, and own mix

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGYCurrently just going to try deionised filtered water

RinseRinse

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

Electro Polishing Issues

Electro Polishing Issues

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY

Clean Room Assembly Class 100

THE COCKCROFT INSTITUTE ofACCELERATOR SCIENCE and

TECHNOLOGY