| Paper | Title | Page |
|---|
| TUP36 | A New Electropolishing System at ANL for Superconducting Quarter-Wave Resonators | 213 |
| | - S. M. Gerbick, M. P. Kelly, J. D. Fuerst
ANL
| |
| | A new electropolishing (EP) system at Argonne
National Laboratory has been used with six quarter-wave
resonators to be installed in the ATLAS superconducting
ion linac. This energy upgrade (7 QWR's, 1 HWR) will
increase the output energy of the ATLAS 68 cavity array
by ~30%. These cavities are the first to be processed in
the new Superconducting Cavity Surface Processing
Facility (SCSPF) built jointly by Argonne National
Laboratory and Fermi National Accelerator Laboratory.
This EP system reduces costs by electropolishing each
cavity as only two major subassemblies prior to the final
electron-beam closure weld. The uniformity of the
polishing is improved through the use of a custom rotating
cathode that also stirs the acid over the entire length of the
cavity, minimizing temperature gradients in the
electrolyte. | |
| TUP75 | Progress on Cavity Fabrication for the ATLAS Energy Upgrade | 331 |
| | - J. D. Fuerst, K. W. Shepard, M. P. Kelly, S. M. Gerbick, Z. A. Conway, G. P. Zinkann
ANL
| |
| | An accelerator improvement project has been
underway for several years to increase the energy of the
ATLAS heavy ion linac at ANL. A new cryomodule
containing drift-tube-loaded superconducting cavities is
nearing the end of construction, with seven new cavities
complete and ready for clean assembly into the cryostat.
We describe the present status of the project, focusing
particularly on cavity fabrication. Several cost saving
techniques suitable for multi-unit production have been
used, including electric discharge machining (EDM) part
trimming and multi-part electron beam weld (EBW)
fixturing. Subsystem fabrication including couplers, slow
tuners, and VCX fast tuners is also described as are the
clean processing techniques used for particle-free
assembly. | |