| Paper | Title | Page |
|---|
| TUP24 | Studies of the high field anomalous losses in small and large grain niobium cavities | 173 |
| | - A. Romanenko, G. Eremeev, D. Meidlinger, H. Padamsee
CLASSE, Cornell University
| |
| | High field Q-slope in niobium cavities of all grain sizes
remains to be an unexplained phenomenon. Thermometry
studies performed in recent years revealed that distribution
of losses in the high field Q-slope regime is not uniform,
but exhibit a patchy character with some regions being hotter
than other. Results of surface analysis of samples dissected
from "hot" and "cold" regions of small and large
BCP cavities are reported in this contribution. | |
| TUP55 | Fine Grain and Large Grain Niobium Cavity Prototyping for a Proton Linac | 255 |
| | - W. Hartung, J. Bierwagen, S. Bricker, C. Compton, T. Grimm, M. Johnson, D. Meidlinger, J. Popielarski, L. Saxton, R. C. York
Michigan State University - G. W. Foster, I. Gonin, T. Khabiboulline, N. Solyak, R. Wagner, V. Yarba
Fermilab - P. Kneisel
JLab
| |
| | A superconducting cavity has been designed and prototyped
for acceleration of particles travelling at 81% the
speed of light (beta = 0.81). The application of interest is an
8 GeV proton linac proposed as an upgrade to the Fermilab
accelerator complex, although the cavity would also be
suitable for other ion accelerators. The cell shape is similar
to that of the 805 MHz high-beta cavity developed for
the Spallation Neutron Source Linac, but the resonant frequency
is 1.3 GHz and the beam tube diameter matches that
of the 1.3 GHz cavity for the TeSLA Test Facility. Four
single-cell prototypes have been fabricated and tested before
and after post-purification. Two of the cavities were
formed from standard high purity fine grain niobium sheet;
the other two were fabricated from large grain niobium, following
up on the work at Jefferson Lab to investigate the
potential of large grain material for cost savings and/or improved
RF performance. Two 7-cell cavity prototypes (one
fine grain, one large grain) have also been fabricated. The
single-cell results are presented in this paper, and the status
of the prototyping effort is reported. | |