| Paper | Title | Page |
|---|
| TUP65 | JLAB CW Cryomodules for 4th Generation Light Sources | 288 |
| | - R. A. Rimmer, R. Bundy, G. Cheng, G. Ciovati, W. Clemens, E. F. Daly, J. Henry, W. R. Hicks, P. Kneisel, S. Manning, R. Manus, F. Marhauser, J. Preble, C. Reece, K. Smith, M. Stirbet, L. Turlington, H. Wang, K. M. Wilson
JLab
| |
| | Fourth generation light sources hold the prospect of
unprecedented brightness and optical beam quality for a
wide range of scientific applications. Many of the
proposed new facilities will rely on large superconducting
radio frequency (SRF) based linacs to provide high
energy, low emittance CW electron beams. For high
average power applications there is a growing acceptance
of energy recovery linac (ERL) technology as the way to
support large recirculating currents with modest RF
power requirements. CW SRF and high current ERLs are
two core competencies at Jefferson Lab. JLab has
designed and built a number of CW cryomodules of
several different types starting with the original CEBAF
design, with variations for higher current in the two
generations of JLab's free-electron laser (FEL), through
two intermediate prototypes to the final high-performance
module for the 12 GeV upgrade. Each of these represent
fully engineered and tested configurations with a variety
of specifications that could be considered for possible use
in fourth generation light sources. Furthermore JLab has
been actively pursuing advanced concepts for highcurrent
high-efficiency cryomodules for next generation
ERL based FEL's. These existing and proposed designs
span the range from about 1mA single-pass to over 100
mA energy recovered current capability. Specialized
configurations also exist for high-current non-energy
recovered sections such as the injector region where very
high RF power is required. We discuss the performance
parameters of these existing and proposed designs and
their suitability to different classes of fourth generation
light sources. | |
| WEP31 | Optimization of the SRF Cavity Design for the CEBAF 12 GeV Upgrade | 536 |
| | - C. E. Reece, E. F. Daly, J. Henry, W. R. Hicks, J. Preble, H. Wang, G. Wu
JLab
| |
| | Based on initial testing of the "HG" and "LL" 7-cell
cavities in the prototype cryomodule Renascence, several
opportunities for improved optimization were identified.
The HOM damping configuration was refined so as to
meet the requirements for damping key dipole modes
while simultaneously dramatically reducing risk of HOM
pickup probe heating and also creating beamline clearance
for mounting the tuner to stainless steel helium vessel
endplates (rather than NbTi/Ti transitions to a titanium
helium vessel). Code modeling and bench measurements
were performed. The new design maintains the 7-cell LL
cells and incorporates a brazed transition between Nb and
the SS helium vessel. The resulting configuration is now
called the "C100" design. Cavity design details as well as
vertical dewar and horizontal test bed performance are presented. | |