Speaker
Description
A principal challenge associated with the realisation of the muon collider is the rapid acceleration of muons from injection to top energy within their lifetime. Rapid-cycling synchrotron (RCS) designs proposed thus far suffer limitations based on magnet ramp rates, power efficiency and power supply, and path length/time of flight differences (for the hybrid RCS proposals).
As an alternative, we outline acceleration schemes based on the Vertical-Excursion Fixed-Field Accelerator (vFFA) concept, wherein muons can be accelerated over equivalent energy ranges to RCS designs using exclusively time-independent superconducting magnets – whilst maintaining constant tunes and a zero path length difference. Stable vFFA lattices with comparable footprints to RCS1 and RCS4 are proposed, revealing the possibility for an energy-efficient machine without limits on acceleration rate imposed by magnet and power supply constraints. Moreover, the quasi-isochronous operation of the vFFA enables the possible use of on-crest acceleration, enabling a more efficient use of the available RF power and potentially eliminating the need to tune RF cavities over the acceleration cycle.
However, vFFAs suffer from complications associated with intrinsically coupled transverse optics. This poster additionally details methods whereby the coupled optics can be circumvented in straight sections to allow the construction of dispersion suppressors, as well as simplified injection and extraction systems. Ultimately, a vFFA ring with a number of ‘decoupled straights’ containing injection and extraction systems, as well as dispersion-suppressed high-gradient RF insertions, presents a viable and competitive alternative to RCS designs for muon acceleration – though further numerical simulation of transverse optics and longitudinal stability must now be conducted.
| What category does your poster fit in? | Acceleration |
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