1. Impedance of Different Kicker Options
Olga Zagorodnova
BDGM, DESY

2. Geometries of the feedback kickers
Geometries of the kickers for TD1 separation and kickers for TLD separation
In vacuum
Out vacuum 1 2
n-1 n
10mm
20mm 1 n …
0.5m a
20mm a
0.5m
Geometries of the feedback kickers
In vacuum
Out vacuum
10mm 1 2
n-1 n 1 2
n-1 n
20mm 1 n …
0.5m a
20mm a
0.5m

3. (1) Analytical estimation of resistive wake for round pipe
Material: Stainless Steel 1,4435 X2 CrNi MO a

4. (2) Analytical estimation for cavity (g - finite)
g=10mm a
a=20, 15, 10mm
(3) Analytical estimation for step-out transition (g - infinite)
b=20mm a
a=20, 15, 10mm

5. The table shows different combinations of kickers with
different apertures in vacuum and out of vacuum
TD1
TDL
Feedback A
a (mm) 20
n (in vacuum) 5 4
n (out vacuum) 22 6 B 15 2 17 10 C 3 12

6. Energy Spreads in kV/nC, calculated for the gaussian bunch 25mkm
In Vacuum
Out vacuum
TD1
TDL
Feedback
Total A
a=20mm
258 64
103
425
181 49 66
296 B
a=15mm
310
105
142
557
242 93
163
498 C
a=10mm
403
185
315
903
362
164
288
814

7. Impedance budget for the collimation section without kickers
Total energy spread

8. Contributions of the kickers with different apertures
20mm 1 n …
0.5m a
Contributions of the kickers with different apertures
to impedance budget of collimation section
a, mm
In Vacuum
Out Vacuum A 20
5.7% 4% B 15
7.3%
6.6% C 10
11.3%
10.3%