| Paper | Title | Page |
|---|
| WEP01 | Studies of alternative techniques for niobium cavity fabrication | 429 |
| | - C. Compton, D. Baars, T. Bieler, J. Bierwagen, S. Bricker, W. Hartung, D. Pendell, R. York
Michigan State University - L. Cooley, H. Jiang, B. Kephart
Fermilab
| |
| | Alternative fabrication techniques for superconducting
radio frequency (SRF) cavities are being investigated.
The main goals are to reduce cavity fabrication costs and
expand possibilities for advanced cavity designs. At
present, SRF cavities are fabricated via deep drawing of
parts from sheet material and electron beam welding
(EBW) to join the parts together. EBW produces welds of
high quality, but the procedures are costly and timeconsuming.
Alternative technologies being explored
include tungsten inert gas (TIG) welding of Nb,
hydroforming of Nb, and electron-beam free form
fabrication (EBFFF) of Nb. If techniques can be
developed which do not degrade the Nb purity, TIG
welding could reduce or eliminate the need for EBW.
Hydroforming could also be an alternative to deep
drawing and EBW. As has been demonstrated by several
other groups, complete cavities can be hydroformed from
Nb tubes in one step using internal pressure and outer
dies. Hydroforming of cavities in an industrial setting is
presently being explored. EBFFF is a new technique for
forming parts from wire stock with an electron beam.
Though it may not be suitable for fabrication of a
complete cavity, EBFFF could be used to produce tubes
for hydroforming or parts for drift tube cavities.
Additionally, the possibility of producing single crystal
tubes using EBFFF is being explored. | |