XFEL AMTF Cavity and Module RF Measurement Procedures
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Transcript of XFEL AMTF Cavity and Module RF Measurement Procedures
Hamburg 2013.05.28
European Linear Collider Workshop ECFA LC2013
Krzysztof Krzysik
XFEL AMTF Cavity and Module RF Measurement
Procedures
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
RF Team has to test …
840 Cavities
103 Modules
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Test of Cavity
•spectrum measurement (warm)
Incoming inspection
•spectrum measurement (warm)
•HOM couplers tuning
•cables connection (insert) + TDR check
Preparation
•cables connection (test-stand) and calibration
•spectrum measurement (cold)
•power rising (qe curves)
Vertical test
•spectrum measurement (warm)
Outgoing inspection
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Spectrum measurement (warm)
Array of points (freq, S21)input-pickup
Frequencies of fundamental modes “Field flatness”
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
HOM couplers tuning
Setting up minimum of the rejection filter: hom1, hom2 Array of points (freq, S21)pickup-hom1 / input-hom2
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cables connection (insert) and TDR check
Cables connection in insert Circuit check (discontinuity, short) with Time Domain
Reflectometry
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Vertical test-stand - schematic
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cable connection (test-stand) and calibration
Cable connection in test-stand Calibration – power correction measurement
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Spectrum measurement (cold)
Frequencies of fundamental modes Lock on 9/9π mode Phase (Pfor, Ptrans)
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Power rising (qe curves)
Max Eacc (limitation)
Q0-factor vs. Eacc
Radiation vs. Eacc
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Test of Module
•spectrum measurement (warm)Incoming
inspection
•warm coupler conditioning
•coupler conditioning during cool-down
Preparation•cold cables calibration
•cavities tuning with VNA
•Qext adjustment
•HOM spectra measurements
Test @ 2K(low power)
•cavities fine tuning
•cavities calibration
•cavities performance test
•heat loads measurements
Test @ 2K(high power)
•spectrum measurement (warm)Outgoing
inspection
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Warm coupler conditioning /Coupler conditioning during cool-down
Removal of impurities from the couplers Sequence of pulses (power, length)out of resonance
Warm: room temperature, cool-down: up to 100K
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cold cables calibration
Cold cables calibration – reflection mode (S11)
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cavities tuning with VNA / Qext adjustment
Cavities tuning near resonance: with VNA and tuning application (rough frequency tuning)
Qext adjustment: with VNA (manually) or with klystron (motors on couplers)
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
HOM spectra measurement
Frequencies and Qhom1 / hom2 for TM011, TE111 and TM110 peaks.
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cavities fine tuning
Cavities fine tuning – with LLRF Monitoring system and Tuning Application
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Cavities calibration
Cavities calibration (before flat-top): Kt
Qload, Qtrans, Qhom1, Qhom2
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Max Eacc (limitation)
Eacc @ radiation = 10-2 mGy/min (operating gradient)
Cavities performance test (flat-top)
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Heat loads measurement
Heat loads ~ Q0-factor vs. Eacc
XFEL AMTF Cavity and Module RF Measurement Procedures
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2013.05.28 HamburgKrzysztof Krzysik
Thank You for Your attention