Specification of the kicker Measurement of the magnetic field inside the kicker Optimisation of the kicker impedance to 50 Status and picture of the

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Bethanie Hunter
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1 Specification of the kicker Measurement of the magnetic field inside the kicker Optimisation of the kicker impedance to 50 Status and picture of the kicker

2 The Specification of the Feedbackkicker technical data: TTF2 TTF1 pulse power 4.5kW 1kW voltage 450V 220V electrical strength 1,5kV 1kV current 9,5A 4,5A frequency 50MHz 50MHz impedance of the kicker length 1000mm 400mm coating material stainless steel (titan stabilised) coating-thickness 700nm 1 m Kicker design: a small reflectance factor, to match the kicker-impedance to 50 a large frequency range, to have a fast rise time a small reduction of the magnetic field by the sputtered chamber the maximum magnetic field

3 The Measurement of the Magnetic Field Conductor Absorber 50 Current Chamber Probe (fixed) Trigger source Trigger Pulser Puls Scope The goal: optimisation of the kicker geometry in order to achieve high field strength and an impedance of 50 free parameters: geometry of the conductor distance between the conductor and the chamber

4 The Measurement of the Magnetic Field 50 geometry time 50ns/div yellow curve current on the Absorber green curve probe voltage max. achieved magnetic field = 225mV for the 1st prototype The Kicker was built in a 50 geometry.

Measurement results conductor with a perimeter of

with a perimeter of 59mm and with a hole

field voltage with a Kicker Impedance of 50 225mV

field was achieved with a minimum distance

540mV Remark: The measurement was done with only

5 Measurement results conductor with a perimeter of 83mm conductor with a perimeter of 59mm conductor with a perimeter of 59mm and with a hole conductor with a perimeter of 20mm the magnetic field voltage with a Kicker Impedance of mV 281mV 284mV 540mV the maximum of the magnetic field was achieved with a minimum distance between conductor and chamber 309mV 378mV 284mV 540mV Remark: The measurement was done with only one conductor (no pair) We have a reduction by the sputtered chamber of 3%

6 The Kicker impedance (Measurement with a Time Domain Reflectormeter) 10 /div 17.5ns +/- 2 +/- 10 2ns /div green curve: pulse with a rise time of 17.5 ps (57GHz) white curve: pulse with a rise time of 5ns (200MHz) field build up time of 17.5ns

Frequency responses of the Kicker (Measurement with a Network/Spectrum Analyser HP4195 ) S1 R1 T1 S2 R2 T2 D B Power splitter 10-500 MHz C Length

7 Frequency responses of the Kicker (Measurement with a Network/Spectrum Analyser HP4195 ) S1 R1 T1 S2 R2 T2 D B Power splitter MHz C Length compensation between C and. R1 length cable Feedbackkicker black curve: amplitude with a absorbability of 3.25 db (50MHz) blue curve: phase with a drift of 26 (50MHz)

8 Status: Construction is finished Kicker installation after vacuum installation i.e year

9 TTF1 Feedbackkicker TTF2 Feedbackkicker

10 TTF2 Feedbackkicker TTF2 Feedbackkicker

11 TESLA damping ring- injection / ejection Specification of injection / ejection Generation of a pulse with a pulse length of 5ns Creation of pulsers with a pulse length of 80ns Measurement at TTF 1

12 TESLA damping ring- injection / ejection Specification Pulse voltage <7,5kV Pulse current 100A Pulse lenght 20ns (better 10ns) Rise time (10%-90%) 8ns (better2ns) Waveform half sinusoidal Micro pulse repetition rate 3MHz Makro pulse repetition rate 5Hz Time stability 0.01% Amplitude stability 0.01% Number of bunch 2820

Generation of a pulse with a pulse length of 5ns Stripline Kicker A principle set up of the pulser A Behlke switch in Mosfet technology

500 single pulses with 1 s spacing Pulse current Magnetic field probe voltages 5 ns/div Pulser Pulser data: Voltage U= 4,5kV Pulse current I=

(10-90%) HTS 50-08UF 5kV 80A(tp<50ns) 3kHz 100ps 1.2ns On this graph you can see a measurement of the magnetic field.

13 Generation of a pulse with a pulse length of 5ns Stripline Kicker A principle set up of the pulser A Behlke switch in Mosfet technology Generate max. 500 single pulses with 1 s spacing Pulse current Magnetic field probe voltages 5 ns/div Pulser Pulser data: Voltage U= 4,5kV Pulse current I= 40A Frequency f=1mhz Pulse length t= 5ns Number of pulses <500 Behlke switch data: Type Pulse voltage Pulse current Frequency Jitter Rise time (10-90%) HTS 50-08UF 5kV 80A(tp<50ns) 3kHz 100ps 1.2ns On this graph you can see a measurement of the magnetic field. We have tested a pulser with a Behlke switch with a t on time of 5ns and a strip line kicker. Green curve probe voltage 3V Yellow curve absorber current 19,25A Power supplies voltage 2kV Pulse length 5ns Rise time (current) 2.25ns Fall time (current) 1.88ns Rise time (probe) 1.88ns Fall time (probe) 1.63ns

Creation of pulsers with a pulse length of 80ns Voltage

Pulse current I=73A Frequency (burst) f=1mhz Number of

Pulse voltage Pulse current Frequency Jitter Rise time

principle set up of the pulser A Behlke switch in Mosfet

14 Creation of pulsers with a pulse length of 80ns Voltage Pulse current 20ns/div Pulser data: Voltage U= 7,5kV Pulse current I=73A Frequency (burst) f=1mhz Number of pulses<200 Pulse length t= 80ns Behlke switch data: Type Pulse voltage Pulse current Frequency Jitter Rise time 10-90%) HTS 80-12UF 8kV 120A(tp<50ns) 3kHz 100ps 2ns A principle set up of the pulser A Behlke switch in Mosfet technology Generate max. 200 single pulses with 1 s spacing Ferrite kicker

15 Measurement at TTF 1 Ferrite kicker A principle set up of the Kicker a equipment test measure the kicker strength scan the kicker pulse with a step width of 4ns and taking 5 pulses for each data point. Data: Beam energy Voltage Pulse current Pulse length Bdl 61MeV U= 7,5kV I=61A t= 80ns Tm

16 Measurement at TTF 1 Ferrite kicker A principle set up of the Kicker a equipment test measure the kicker strength scan the kicker pulse with a step width of 0.5ns and taking 30 pulses for each data point. Data: Beam energy Voltage Pulse current Pulse length 208MeV U= 7,5kV I=61A t= 80ns

Fast Kickers at DESY

Fast Kickers at DESY Injection / ejection in a TESLA like DR Generation of a pulse with a pulse length of 12ns Measurement at TTF 2 Full power test Measurements at ATF XFEL activity Talk given by Hans