Speaker
Description
Muon final cooling requires low-frequency RF cavities to satisfy beam-dynamics constraints, but conventional cavity dimensions increase rapidly as the operating frequency decreases. This work investigates compact RF cavity concepts for final cooling, focusing on reentrant geometries and dielectric loading using alumina and water. CST simulations were performed from 100 MHz down to 3 MHz, comparing cavity radius, R/Q, Q0, dissipated power, average power, and peak electric fields.
The results show that dielectric loading can significantly reduce the cavity radius, typically by about 70-85% depending on the frequency and configuration. Reentrant geometries improve the concentration of the useful accelerating field, leading to higher R/Q and lower dissipated power compared with simple cylindrical cavities. However, dielectric loading also introduces clear trade-offs, mainly a reduction in Q and R/Q and an increase in RF losses. Peak-field estimates remain below the assumed dielectric-strength limits for alumina and water, supporting the first-order feasibility of these concepts.
This study highlights the need for further optimisation of geometry–material combinations and for experimental validation of dielectric properties, especially εr and tanδ, in the 10-100 MHz range.
| What category does your poster fit in? | Muon Cooling Demonstrator |
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