ERL07 WG2 Session 2 - Notes

Sakanaka - Ion Trapping

Use kicker to kick out parts of the injector beam - needs fast kicker (1.3 GHz bunch separation), and get ringing. Maybe can avoid ringing by using two kickers Pi out of phase.

Methods to avoid trapping:
1. Gaps - match beam loading in main linac, and use feed-forward RF in injector
2. Beam blow-up - no beam loading in injector, but the fact there is still focusing term from the blown-up bunches mean that the effect on clearing is less good.
3. Moving the beam - 'beam shaking'. Not viewed as a good thing - tends to hits resonances .

Nakamura -Resistive-Wall Beam Breakup

PRST-AB 7, 034402 (2004)

Transverse wakefield can give break-up.