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WFM electronics Alexandra Andersson
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F. Peauger – CTF3 committee – 11/02/10 Wakefield Monitors implemented in two accelerating structures TD24 (tank version, without SiC loads (except for the WFM)) 2 WFM experiment in CLEX Each WFM will study two different modes: TM like mode at ~ 18 GHz (+ hybrid recombination) TE like mode at ~ 24 GHz RF Design finished (GdfidL + HFSS simulations) Mechanical design under progress (CERN) Connectors, Vacuum cables, 3dB/180° Hybrids ordered SiC load TM modes TE modes Waveguide bend Port signals for beam offset ∆ x=1mm 18 GHz 24 GHz TM (+ perfect hybrid) TE
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F. Peauger – CTF3 committee – 11/02/10 Qualification of three firms for precise machining (2 prototypes) Results of Firm n°1: 3 Fabrication of the accelerating structures Very low roughness of turned surfaces Ra = 0.009 to 0.022 (spec=0.025) Roughness of milled faces higher (factor of 10) but can be improved with monocristal cutting tool Tolerances within 3 µm (spec=2.5) Planarity of 1.7 – 3.2 µm (spec=2µm), can be improved by better stress relieve process Results from Firms n°2 and 3 expected in few weeks Schedule (target): - all the disks for the two structures machined:mid 2010 - structures ready for test with beam on TBTS:end 2010 ? But challenging planning Note: need maybe an additional BPM on TBTS, just before the structure (to be discussed) Very promising results
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Detection scheme Waveguide Waveguide to coax Power limiter Low Noise Amplifier Down mix with 18GHz (24->6, 22.5->4.5,...) Power splitter Magnitude detected with logarithmic diode detector BandPass around 6GHz for phase detection Compare to phase of the 12GHz RF. Use Local Oscillator of common derivation
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Detection Scheme
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LO generation
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Noise Component Loss/Gain [dB]Noise FigureGain linear Noise, F (linear) Gain casc. (linear) Noise Casc. (linear) Noise Casc. dB/Hz Gain casc. dB damped waveguide-10.010.00.110.00.110.0 -10.0 vacuum cable-2.02.00.61.60.115.812.0-12.0 vacuum feedthrough-0.50.50.91.10.117.812.5-12.5 Waveguide -> sma transition0.0 1.0 0.117.912.5-12.5 Waveguide and flanges-3.73.70.42.30.042.016.2-16.2 Waveguide -> sma transition0.0 1.0 0.042.416.3-16.3 PIN diode limiter-2.52.50.61.80.075.418.8-18.8 Low Noise Amplifier30.02.51000.01.813.3134.021.311.2 Mixer-7.07.00.25.02.6134.321.34.2 Power Splitter-5.05.00.33.20.8135.221.3-0.8 dBm/Hz (-174dBm/Hz + Casc. Noise Figure)mW/HzmWdBmW -152.75.4E-161.1E-06-59.71.1E-09
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FrequencyPhase LO 1 (crystal oscillator)16.384 MHzφ1φ1 LO 2 (crystal oscillator)48 MHzφ2φ2 LO 3 (crystal oscillator)75 MHzφ3φ3 Mixer 1, LO1xLO264.384 MHzφ1+φ2φ1+φ2 Mixer 2, LO2xLO3123 MHzφ2+φ3φ2+φ3 Mixer 3, Mix1xMix2187.384 MHzφ 1 +2φ 2 +φ 3 LO = Mix 3 x16 (divide-by-N PLLL)2998.144 MHzφ LO= 16(φ 1 +2φ 2 +φ 3 ) 2xLO (frequency doubler)5996.288 MHz2φ LO 6xLO (frequency tripler, doubler)17988.864 MHz6φ LO WFM signal23988.4 MHzφ WFM DownMix1 = WFM x (6xLO)5999.536 MHzφ WFM -6φ LO IQ1=DownMix1x(2xLO)3.248 MHzφ WFM -8φ LO RF signal11994.2 MHzφ RF DownMix2 = RF x (2xLO)5997.912 MHzφ RF -2φ LO IQ2=DownMix2x(2xLO)1.624 MHzφ RF -4φ LO Phase WFM-RF = IQ1-2IQ2φ WFM -2φ RF Frequencies and phases
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Waveguide
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534mm 194mm
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Waveguide
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