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Charge normalisationand IP LO power scan
N. Blaskovic
N. Blaskovic
Contents
• Jitter dependence on charge normalisation(using P3 ΣI, IP reference diode or neither)
• IPC I & Q dependence on LO power level
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Charge normalisation
• Calibration and jitter runs taken on 060314• Waist on IPC in Y• Multiple RF variable attenuator settings• Upstream and downstream boards set-up• Results presented:
– Charge normalised using P3 ΣI
– Charge normalised using IP reference diode– Not charge normalised
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Charge normalisation
• Charge normalisation appears to worsen jitter, particularly if reference diode is used
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LO power scan
• Jitter runs taken on 140314• Waist on IPC in Y• RF variable attenuator set to 10 dB• LO level for IPC(Y) electronics changed by
0-11 dB variable attenuator• I & Q signals in LO power scan presented
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IPA
IPB
IPC
Ref splitter
electronics
electronics
electronics
attenuator
RFvariable
attenuator
diode
FONT5 board
(digitiser)
port 1port 2
port 1port 2
port 1port 2
IQ
IQ
IQ
IP BPM C-band signalReference C-band signalBase-band signal
6.4 GHz (y) / 5.7 GHz (x)
hybrid
hybrid
LO var. atten.
LO variable attenuator
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
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IPC(Y) I
IPC(Y) Q
Ref(Y)
LO power scan
• Mixer output should be in region where it does not vary with input LO level; Siwon:
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Linear IF output rangedue to LO input
Next steps
• Priority:– Propagate P2 & P3 position to IP waist (MAD)– 0-11 dB variable attenuator path length test– AQF7FF position to IP y’ pitch relation (FS)
• Interesting, but perhaps secondary:– Phase advance along beamline (MAD)– along beamline including MQF1-5X
• Digitiser at IP if 2 boards not available for upstream feedback with monitoring at IP?
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