RF cavity R&D at LBNL for the NLC Damping Rings,FY2000/2001 Page: 1 of 93
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CBP Tech Note-231
RF cavity R&D at LBNL for the NLC Damping Rings, FY2000/2001
R.A. Rimmer, D. Atkinson, J.N. Corlett, G. Koehler, D. Li,
N. Hartman, I Rasson, T. Saleh, R. Weidenbach
LBNL, 1 Cyclotron Rd., Berkeley, CA 94720
This report contains a summary of the R&D activities at LBNL
on RF cavities for the NLC damping rings during fiscal years
2000/2001. This work is a continuation of the NLC RF system R&D of
the previous year . These activities include the further
optimization and fine tuning of the RF cavity design for both
efficiency and damping of higher-order modes (HOMs). The cavity
wall surface heating and stresses were reduced at the same time as
the HOM damping was improved over previous designs. Final
frequency tuning was performed using the high frequency
electromagnetic analysis capability in ANSYS. The mechanical design
and fabrication methods have been developed with the goals of
lower stresses, fewer parts and simpler assembly compared to
previous designs. This should result in substantial cost savings. The
cavity ancillary components including the RF window, coupling box,
HOM loads, and tuners have been studied in more detail. Other cavity
options are discussed which might be desirable to either further
lower the HOM impedance or increase the stored energy for reduced
transient response. Superconducting designs and the use of external
"energy storage" cavities are discussed. A section is included in which
the calculation method is sumarized and its accuracy assessed by
comparisons with the laboratory measurements of the PEP-II cavity,
including errors, and with the beam-sampled spectrum.
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Rimmer, R.A.; Atkinson, D.; Corlett, J.N.; Koehler, G.; Li, D.; Hartman, N. et al. RF cavity R&D at LBNL for the NLC Damping Rings,FY2000/2001, report, June 1, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc885353/m1/1/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.