| Paper | Title | Page |
|---|
| TUP07 | Frequency and Length Adjustment of a Dumbbell for the PEFP Low-Beta SRF Cavity | 116 |
| | - C. Y. Gao, A. Sun, Y. -S. Cho, B. -H. Choi
PEFP, Korea Atomic Energy Research Institute
| |
| | This paper describes a method to adjust the frequency
and the length of a dumbbell used to fabricate the PEFP
low-beta superconducting RF cavity. A tuning program is
used to calculate the pi mode frequency of each half-cell
according to the resonant frequency of a TM010 passband
and the perturbation frequency shifts of a dumbbell.
According to the frequency difference between the two
half cells and the frequency sensitivity coefficients, we
can determine the tuning length in the axial direction or
the trimming length at the equator to make the two half
cells have the same frequency and length. In order to
measure the frequency and to compensate for the length
of a PEFP dumbbell for a stiffening-ring welding
shrinkage, a frequency measurement set and length tuning
set have been fabricated. | |
| WEP35 | RF superconductivity activities of PEFP | 553 |
| | - A. Sun, C. Y. Gao, L. P. Zhang, Y. Z. Tang, Y. M. Li, H. S. Kim, Y. -S. Cho, B. -H. Choi
PEFP, Korea Atomic Energy Research Institute
| |
| | Radio Frequency (RF) superconductivity activities of
the Proton Engineering Frontier Project (PEFP) aim to
develop a superconducting RF linac to accelerate a proton
beam above 80 MeV at 700 MHz. In the past two years,
the preliminary design of a low-beta cryomodule has been
completed. A low-beta (beta=0.42) cavity, a higher-mode
coupler and a fundamental power coupler for the PEFP
cavities have also been designed. The dies, fixtures and
coining rings, as well as the dumbbell tuning sets of the
low-beta cavity have been designed and fabricated. Also a
warm tuner for PEFP cavities has been designed and
fabricated for tuning the PEFP cavity field flatness. Two
prototype copper cavities are under production and
testing. An overview of the RF superconductivity
activities of PEFP in the coming two years is presented. | |