Longitudinal impedance of new RF fingers

O. Berrig, C. Garion, B. Salvant

Longitudinal impedance from an ideal shielding

Z/n~ 8 10-6 Ohm To be checked: how many? How many other designs? Compute transverse

impedance

Longitudinal impedance from bellow with shielding

thin shielding difficult to mesh correctly with CST wakefield

Comparing longitudinal impedance

Very similar Z/n : shielding is working well in longitudinal

Eigenmode solver

Mode Freq R Q

1 1.6 ~0 4400

2 2.5 ~0 5600

3 3 4.5 4600

4 3.4 ~0 5100

No harmful longitudinal mode detected