1. XFEL Beam Collimation and Switchyard Review Beam Switchyard
FEL-Beam-Dynamics Group
Winni Decking

2. pulser prototype measurement pulser prototype measurement
Beam Distribution
15o deflection to Dump
2.2o arc to SASE 2
200 ns
300 ms
low accuracy
(>1 %)
5 MHz burst operation
high accuracy
(< 0.01 %)
10 Hz operation
pulser prototype measurement
pulser prototype measurement
Winni Decking

3. Beam Switchyard Optics
to T1
to dump
to T20
15o deflection to Dump
2.2o arc to SASE 2
Winni Decking

4. Distribution: Kicker Strength & Stability
kicked un-kicked
Septum thickness: xseptum=5 mm
Tolerable jitter: njitter=0.1 s
Collimation depth: mcollimation=85 s
Beta at Septum: bseptum=30 m
<Beta> at Kicker: bkicker=25 m
Septum
Winni Decking

5. Kick Trajectory
0.5 mrad kick required
Winni Decking

6. XFEL BD Kicker amd Septum Specs
Fast single bunch kicker (for beam dump)
Flat top kicker
(for beam distribution)
Pulse Form
Burst
Flat top
Repetition Rate Hz
5×106 10
Max. Pulse Width s
200×10-9
300×10-6
Rise/Fall Time
< 100×10-9
≈20×10-6
Rel. Amplitude Stability
0.01
3×10-4
Relative Residual Ripple
Kick angle
mrad
0.5
Max. int. Field Strength
mT×m 42
Min. full aperture mm 30
Max. system length m 18
Winni Decking

7. Beam Switchyard - Collisions
Winni Decking

8. Collision – TD1 Kickers & Beam Dump Line
Severe Collisions, requires re-design of dump line
stronger septum planned
give up achromat vertical dogleg and horizontal bend
Winni Decking

9. Collision – TD2 straight & TD1 arc
collision of 2 quadrupoles
remove straight line quad – easy
remove bend quad – maybe not possible => mirror plate quad
Winni Decking

10. Passage of Dump Line - Okay
Winni Decking

11. TD1 Arc
Winni Decking

12. Off-Momentum Beam Transport
d = 0%, ±1.5%
1 s ellipses
2 sextupoles
horizontal
vertical
d = 0%, ±1.5%
1 s ellipses
Winni Decking

13. Off-Momentum Beam Transport
d = 0%, ±2.5%
100 s ellipses
Missing: Influence of kicker
Influence of septum stray fields has been calculated by Bagrat Grigoryan
Winni Decking