16-aug-2012 Exp Concept

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Fermionics InGaAs test (FEL IR light source – 1ps nom)

1.55um IR light Fast scope and PSEC4 logging

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USB cable shield grounding to case

External trigger From FEL

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12-SEP-2012 Exp Set-up

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Data Logging via PSEC4

5 ~6us delay from the kicker signal for logging

Sample Scope Trace

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-5

0

5

10

15

20

25

0 200 400 600 800 1000 1200

Ampl

itude

[mV]

Time [ns]

IR Laser pulse

Ch. 1

2GSa/s & 1GHz ABW

Scope Undersampled

7

0

5

10

15

20

25

0 20 40 60 80 100 120 140

Ampl

itude

[mV]

Time [ns]

IR Laser pulse

Ch. 1

2GSa/s & 1GHz ABW

Signal into Chan 1

8 10GSa/s & 1.5GHz ABW

9

0

50

100

150

200

250

300

0 1E+09 2E+09 3E+09 4E+09 5E+09

FFT

Mag

nitu

de [a

rbitr

ary]

Frequency [Hz]

4 shots concatenated

4x events

5 per. Mov. Avg. (4x events)

2.86 GHz

Summary

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• Detector (in current sub-optimal packaging) seems to have response to resolve microbunch structure • Next step is to try measuring with higher ABW scope, to see how well we should expect to do • In principle the STURM2 ASIC should have 3GHz ABW, which should be sufficient to resolve

Input Power (ext PS)

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SMA Inputs

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