SLIDE 1
EMMA MA RF System
- C. Ohmori and J. S. Berg
FFAG09
EMMA MA System
* Many FFAG applications require slow acceleration
* Linear non-scaling FFAGs cross many resonances
- Nonlinear resonances
- Imperfection resonances
* Resonances damage beam more when you cross them slowly
* There is thus a minimum rate at which you can cross resonances
- May depend on magnitude of errors
* Low-frequency RF to allow slow acceleration
- EMMA as-is only allows very rapid acceleration
- Primarily due to high-frequency RF system
* Accelerate rapidly then reduce rate
- Start with 100 turns to insure success
- Reduce acceleration rate and study effects
10-5
2 4 6
10-4
2 4 6
10-3
2 4 6
10-2
normalized DA [ m rad]
100 80 60 40 20
1 of alignment error [m]
100 Turns 1,000 Turns
(Machida)