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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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