16-aug-2012 exp set-up - university of hawaii › ~idlab › taskandschedule › xfel ›...
TRANSCRIPT
Fermionics InGaAs test (FEL IR light source – 1ps nom)
1.55um IR light Fast scope and PSEC4 logging
2
Sample Scope Trace
6
-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
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
10
• 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