font meeting1 charge normalisation and ip lo power scan n. blaskovic
TRANSCRIPT
![Page 1: FONT Meeting1 Charge normalisation and IP LO power scan N. Blaskovic](https://reader035.vdocuments.site/reader035/viewer/2022081520/5697bfb81a28abf838c9f39c/html5/thumbnails/1.jpg)
FONT Meeting 1
Charge normalisationand IP LO power scan
N. Blaskovic
N. Blaskovic
![Page 2: FONT Meeting1 Charge normalisation and IP LO power scan N. Blaskovic](https://reader035.vdocuments.site/reader035/viewer/2022081520/5697bfb81a28abf838c9f39c/html5/thumbnails/2.jpg)
Contents
• Jitter dependence on charge normalisation(using P3 ΣI, IP reference diode or neither)
• IPC I & Q dependence on LO power level
FONT Meeting 2N. Blaskovic
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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
FONT Meeting 3N. Blaskovic
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FONT Meeting 4N. Blaskovic
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Charge normalisation
• Charge normalisation appears to worsen jitter, particularly if reference diode is used
FONT Meeting 5N. Blaskovic
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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
FONT Meeting 6N. Blaskovic
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FONT Meeting 7N. Blaskovic
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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FONT Meeting 8N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 9N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 10N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 11N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 12N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 13N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 14N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 15N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 16N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 17N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 18N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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FONT Meeting 19N. Blaskovic
IPC(Y) I
IPC(Y) Q
Ref(Y)
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LO power scan
• Mixer output should be in region where it does not vary with input LO level; Siwon:
FONT Meeting 20N. Blaskovic
Linear IF output rangedue to LO input
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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?
FONT Meeting 21N. Blaskovic