Wakes in rf structures

1
Wakes in rf structures
2
Wakefield Definitions and Scaling
A. Chao
Deflecting force/e on test charge e per offset of
q V/m2/pC
Retarding force/e on test charge e due to q V/m/pC
Dimensionally
Deflecting wakes increase disproportionately at
short l!
3
Transverse Wakes Beam Breakup
1
2
y1
Head resonantly drives tail
BNS Damping -- detune head and tail
frequencies (e.g., w/ energy chirp) Required
spread W1 1/l3 --gt50x too large _at_500
GHz Plasma has (large
W but no dipole component w/o channel)