1. CIEMAT ACTIVITIES ON STRIPLINE KICKERS I. Rodríguez

2. 22 Outline CTF3 Combiner Ring Kicker CTF3 TL2 Tail Clippers Stripline kickers in ILC Conclusions

3. 33 CTF3 Combiner Ring Kicker (1) Kicker location in CTF3 Combiner Ring (CR) Extraction of beam after 4-turns combination in the CR Substitution of an old magnetic kicker to improve beam impedance KICKER

4. 44 CTF3 Combiner Ring Kicker (2) Specifications to meet ±1% homogeneity is the most challenging specification MAGNITUDEVALUEUNITS Energy300MeV Deflection Angle8mrad Transverse voltage (V  )2.4MV Rise/Fall-times (0-100%)≤70ns Pulse length (max.)200ns Flat-top reproducibility±0.1% Flat-top stability (including droop)±0.25% Repetition rate (Initial-Nominal)5-50Hz Available length (flange to flange)2000mm Vertical aperture≥40mm Horizontal aperture≥40mm Field homogeneity (±1%)30mm

5. 55 CTF3 Combiner Ring Kicker (3) Design and calculations Several cross sections considered. Planar electrodes chosen 3D model in HFSS: 1.7 m electrodes. Good transmission of pulse frequency content Wakefields studied using CST Particle Studio at CIEMAT and GDFidl at CERN Aperture: 41 mm Electrode height: 44 mm Tube radius: 54 mm Border angle : 42º Border length : 8.2 mm Electrode width : 2 mm Z 0 = 49.99 Ω Homogeneity: ±0.74 % |S 11 | 2 =<0.03% (0 to 50 MHz)

6. 66 CTF3 Combiner Ring Kicker (4) Manufacturing: Fully in stainless-steel Many high vacuum welds required Challenging stand-off support Special beam pipe transitions

7. 77 CTF3 Combiner Ring Kicker (5) Testing Vacuum test and leak rate successful. Mild bake out required High voltage pulser test: 16 kV, 5 ns, 50 Ohm load DC high voltage test: 18 kV successfully tested (14 kV nominal) RF tests Almost no reflection < 0.2% in power up to 35 MHz

8. 88 CTF3 TL2 Tail Clippers (1) Tail Clippers location in CTF3 Shorten the bunch trains for conditioning before PETS Extremely fast response required to precisely cut the beam between bunches TAIL CLIPPERS

9. 99 CTF3 TL2 Tail Clippers (2) Specifications to meet High frequency transmission is the most challenging specification Beam energy200MeV Total kick deflection angle1.2mrad Deflection planevertical Stripline plate separation40mm Field homogeneity±20% Characteristic impedance50 ±1Ohms Pulse duration (maximum)200ns Maximum field rise-time (0.25 to 99.75%)3ns Maximum timing jitter1ns Pulse repetition rate – nominal/maximum5 / 50Hz Number of stripline sections4 Stripline section length (between centre's of feedthroughs)300mm Total available straight section length1625mm Pumping portsnone Supports and Alignment systemas per CR kicker

10. 10 CTF3 TL2 Tail Clippers (3) Design and calculations Several cross sections considered Smooth coax to stripline transitions for enhanced RF transmission Excellent high frequency transmission up to 2 GHz Homog:±19% Ø 66 mm Homog:±15% Ø 71 mm Homog:±10% Ø 78 mm

11. 11 CTF3 TL2 Tail Clippers (4) Manufacturing Stainless steel tube and aluminium electrodes Electrodes fully manufactured using CNC High voltage 50 Ohm feedthroughs Challenging coax to stripline connections

12. 12 CTF3 TL2 Tail Clippers (5) Testing Excellent leak test. Good vacuum. Mild bake-out required High voltage pulser test. Excellent behaviour at high freqs DC high voltage test: 3 kV successfully tested (2 kV nominal) RF tests

13. 13 ILC stripline kickers Many stripline kickers in different zones: DRs, RTML, etc Most challenging ones: Damping Ring injection and extraction kickers. DRs 6.7 km, 5 GeV. The electrical pulser requirements are extremely challenging. MAGNITUDEVALUE* Number of modules in DRs 21 (injection) 11 (extraction) Length0.3 m Voltage±11 kV Bunch spacing3 ns Pulse width< 4 ns Pulse repetition rate150 ns (6.6 MHz) * ILC Reference Design Report (August, 2007)

14. 14 Conclusions Two stripline kickers have been fully designed, manufactured and tested. Tail Clipper power supplies were designed at CERN. ILC kickers are very similar except from the pulsed power supply.