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| THP75 |
Superconducting Accelerating Structure with Gradient as 2 Times Higher as TESLA Structure
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- P. V. Avrakhov, V.E. Balakin
PTC LPI, Protvino, Moscow Region
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A proposed new accelerating structure for TESLA is assumed to have an effective gradient 2 times more than existing 9-cell cavity. This structure is an interlaced combination of two side-cavity-coupled standing wave substructures with λ/4 cells length. Intercell coupling provides side-coupled cavities made from a special shape waveguide section. The high accelerating gradient is accomplished by 4 factors: - The shortened accelerating cells have transit time factor 0.9 instead of 0.64 for conventional standing wave cells with λ/2 length.
- The side magnetic coupling has made it possible to reduce the cells beam aperture that reduce relation between the maximum surface field and the acceleration gradient.
- Stronger intercell coupling allows extending the accelerating cavity and improving a duty factor of linac.
- Availability of the side coupling elements enables to use them for power input and HOM-couplers. It reduces intercavity distance and enhances duty factor too.
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