| Paper | Title | Page |
|---|
| TUP08 | Gradient Limits and SCRF Performance | 119 |
| | | |
| | Superconducting rf gradients are limited by a number
of mechanisms, among them are field emission,
multipactor, Lorentz detuning, global and local heating,
quench fields, Q-Slope, assembly defects, and overall
power use. We describe how each of these mechanisms
interacts with the cavity fields and show how significant
improvements may be possible assuming improvements
in control over the cavity surface. New techniques such
as Atomic Layer Deposition (ALD), the use of layered
composites, Gas Cluster Ion Beam (GCIB) smoothing and
Dry Ice Cleaning (DIC) have been proposed as ways to
control the surface. | |
| TUP64 | Initial Tests of Atomic Layer Deposition (ald) in Superconducting RF Systems | 285 |
| | - M. Pellin, J. Elam, J. Moore, J. Norem
ANL - C. Antoine
CEA-Saclay - L. Cooley
Fermilab - T. Prolier, J. Zasadzinski
IIT - R. Rimmer
JLab
| |
| | Atomic Layer Deposition (ALD) is a method of
synthesizing materials in single atomic layers. We are
studying this technique as a method of producing highly
controlled surfaces for superconducting RF systems. We
have begun tests of ALD coatings of single cells that will
involve RF measurements of a cell before and after
coating at Argonne. In addition to the tests on complete
cells, we are also beginning a program of point contact
tunneling measurements to determine the properties of the
superconductors at the interface between the bulk
niobium and the oxide layer. We describe the method,
and tests we are beginning with single cell resonators and
small samples. | |