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By Hasan Padamsee
This can be the second one ebook to RF Superconducting, written by means of one of many major specialists. The ebook offers quickly and updated entry to the most recent advances within the key expertise for destiny accelerators.Experts in addition to beginners to the sphere will enjoy the dialogue of development within the simple technological know-how, expertise in addition to contemporary and approaching purposes. Researchers in accelerator physics also will locate a lot that's appropriate to their self-discipline.
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Additional resources for RF Superconductivity: Science, Technology and Applications
Example text
24. The resonant frequency shift due to vacuum load was calculated by the SUPERFISH code. The calculated frequency shift of 306 Hz/mbar for a 3 mm Niobium cavity dropped to 74 Hz/mbar for 5 mm. 2 K, and the vacuum load. With a 5 mm wall thickness and both the ends of the beam tubes held fixed the max stress after cool-down is 77 MPa. 4 K. The mechanical stability of spoke resonators is excellent when radial stiffening ribs are used at the ends. 25(a) shows the stress distribution of a 4-gap (3-spoke) cavity with the four supports [112].
Dampers introduced in the mechanical system of cavity and cryomodule reduce the mechanical Q of the resonances. The rf bandwidth can also be widened by increasing the strength of the input coupler, but this demands higher rf power and lowers the operating efficiency. Mechanical tuners are usually too slow to counteract cavity wall deformations from microphonics. The stored energy per cell plays an important role in amplitude and phase control in the presence of microphonics detuning. When beam loading is negligible, the amount of rf power required for phase stabilization is given by the product of the energy content and the amount of detuning.
The superconducting RFQ offers comparable vane voltage but lower power consumption (at Q ~ 108–109) and cw operation. The combination of focusing and acceleration allows approximately one meter long structures with a large number of cells to provide real-estate gradients of 2–3 MV/m. 3 and 10, while the magnetic field ratios are 25 and 30 mT/ MV/m. Hence the design values of the accelerating field are limited. The stored energy is acceptable for state-of-the-art phase-amplitude stabilization circuits.