1. Specifications for the XFEL Beam Switchyard Kickers
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FEL-Beam-Dynamics-Meeting
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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
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3. Emittance Growth due to incoh. Synchrotron Radiation
Relative emittance growth per 1deg bend at 25 GeV
Max. bending radius < 300 m (to allow for fast separation) => max beta-function ≈ 40 m
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4. Beam Switchyard Optics
to T1
to dump
to T20
15o deflection to Dump
2.2o arc to SASE 2
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5. 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
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6. Kick Trajectory
0.5 mrad kick required
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7. 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
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8. In or out of vacuum stripline kicker with d= stripline distance
Kicker Layout
In or out of vacuum stripline kicker with d= stripline distance
Decrease of vacuum chamber size helpful
Test on ongoing for sputtering of d<20 mm ceramics
100 s at kicker location approx 3.5 mm
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9. Possible Tests at FLASH
Realization of the extraction scheme at FLASH
(i.e. kicker + septum + beam dump) at an early stage would allow to test the complete hardware for the XFEL setup
Installation can later be re-used for FLASH-II
Only ‘minor’ redesign of upstream collimator beamline and bypass necessary
kickers (2)
septum
quadrupoles (5)
sextupoles (3)
dipoles (2) ?
collimator (new position is not optimized yet)
shielding wall
energy collimator (position is not optimized yet;
could be interchanged with position of one of sextupoles)
courtesy of Nina Golubeva and Vladimir Balandin
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