XFEL Beam Collimation and Switchyard Review Beam Switchyard FEL-Beam-Dynamics Group 3.12.2007 Winni Decking

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

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

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

Kick Trajectory 0.5 mrad kick required Winni Decking

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

Beam Switchyard - Collisions Winni Decking

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

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

Passage of Dump Line - Okay Winni Decking

TD1 Arc Winni Decking

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

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