| Paper | Title | Page |
|---|
| TUP49 | ECR Plasma Cleaning: An In-situ Processing Technique for RF Cavities | 243 |
| | - G. Wu, H. Jiang, T. Khabiboulline, I. Pechenezhskiy, T. Koeth, J. Reid, W. Muranyi, B. Tennis, E. Harms, Y. Terechkine, H. Edwards, D. Mitchell, A. Rowe, C. Boffo, C. Cooper, L. Cooley, R. Schuessler
Fermilab - W. -D. Moeller
DESY Hamburg - C. Antoine
CEA-Saclay - A. Romanenko
Cornell University
| |
| | A condition for Electron Cyclotron Resonance (ECR)
can be established inside a fully assembled RF cavity
without the need for removing high-power couplers. As
such, plasma generated by this process can be used as a
final cleaning step, or as an alternative cleaning step in
place of other techniques. We will describe the current
effort to study plasma cleaning by ECR in a 3.9GHz
cavity. | |
| 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. | |
| WEP17 | Considerations on the third harmonic RF of the European XFEL | 481 |
| | - E. Vogel, M. Dohlus, M. Huening, K. Jensch, A. Matheisen, W. -D. Moeller, A. Schmidt, W. Singer
DESY Hamburg - H. Edwards, E. Harms, T. Khabiboulline
Fermilab
| |
| | Ultra short bunches with high peak current are required for the creation of high brilliance coherent light in the x-ray range in undulators. At the European x-ray free electron laser (XFEL) they will be obtained by a two stage bunch compression scheme based on off the rf field crest acceleration and transverse magnetic chicanes. The deviation of the rf field's sine shape from a straight line leads to long bunch tails and reduce peak current. This effect will be eliminated by adding a third harmonic rf system. The paper surveys the basic principle for the third harmonic rf, the most relevant design parameters, the actual status of beam physical examinations and potential concepts for the technical realization. | |
| WEP20 | 325 MHz power couplers of spokes cavities for modular, multiple power levels | 489 |
| | - Q. S. Shu, J. Susta, G. F. Chen, I. Phipps, F. H. Lu
AMAC Inc - T. Khabiboulline, N. Solyak
Fermilab
| |
| | In order to increase the protons energy up to 8 GeV
in a driver Linac, the particles must be accelerated
through various stages and three different power levels
(25kW, 100kW and 210kW) are required for the 325
MHz Fermilab Proton Driver couplers. The problem
identified by the project is that no High RF power coupler
for these cavities has ever been designed and produced
using US industrial capabilities. AMAC proposed a novel
resolution by development of innovative modular,
multiple power levels, 325 MHz spoke cavities power
couplers, which to meet three type cavities with one
coupler design. The simulation and concept design are
presented. The results of HFSS, MAFIA, ANSYS, and
Multipacting are also discussed. | |
| WEP41 | Status of 3.9 GHz superconducting RF cavity technology at Fermilab | 575 |
| | - E. Harms, T. Arkan, L. Bellantoni, H. Carter, H. Edwards, M. Foley, I. Gonin, T. Khabiboulline, D. Mitchell, D. Olis, A. Rowe, N. Solyak
Fermilab
| |
| | Fermilab is involved in an effort to assemble 3.9 GHz
superconducting RF cavities into a four cavity
cryomodule for use at the DESY TTF/FLASH facility as a
third harmonic structure. The design gradient of the
cavities is 14 MV/m. This effort involves design,
fabrication, intermediate testing, assembly, and eventual
delivery of the cryomodule. We report on all facets of this
enterprise from design through future plans. Included will
be test results of single 9-cell cavities, lessons learned,
and current status. | |