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An Ultra-stable Event Timer
Etienne SAMAIN
Observatoire de la Côte d’Azur CERGA2130 route de l’Observatoire
06460 CAUSSOLSFrance
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Characteristics
Resolution: 1 psDynamic: 64 bitsExternal Clock Frequency: 10 or 100 MHzPrecision < 3 psLinearity: 1 ps rms ( +/- 1.5 ps)Dead time: 10 µs2 independent channels2 inputs per channel
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Characteristics
Automatic internal calibrationInternal memory: 10 000 measurementsInterface: RS 422 @ 1 MBitsSize: 19 inches rack 3U x 280 mm
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OCA Event timer synoptic
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2 vernier cards
Frequency: 50 MHzResolution: 1 psDead time: 10 µs
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Frequency Synthesis card
Ultra low noise local oscillator @ 100 MHz» Phase noise: 100 Hz : -130 dBc, 10 kHz : -165 dBc
Digital phase lock loop: 20 bitsInput frequency: 10 MHzOutput frequency: 100 MHz and 10 MHzThermal sensitivity < 100 fs/°C (10 to 30 °C)Calibration events
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3 programmable cards
Digital timer: 10 ns resolution
Frequency synthesis control (20 bits)
Global control» Memory (10 000 events)» 16 bits Analog to digital converter» RS 422 serial interface
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OCA Event TimerGround design
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OCA Event Timer Preliminary Space Design (EREMS)
Mass: 7 kgSize: 250×240×130 mm3
Power: 40 W
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Asynchronous Test Bench
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Thales Event timers
2 event timers (5 & 2 ps rms)200 MHz frequency synthesisGlobal control» Memory (10 000 events)» 16 bits Analog to digital converter» RS 422 serial interface
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Spectral density of the vernierlinearity error
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1.00E+07 1.00E+08 1.00E+09 1.00E+10 1.00E+11
Frequency (Hz)
Sp
ectr
al d
ensi
ty (
ps/
Hz1
/2)
Linearity: 1 ps rms, +/- 1.5 ps
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Synchronous Test Bench
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Time stability
0.001
0.01
0.1
1
10
0.001 0.01 0.1 1 10 100 1000 10000ττττ (s)
σσσσx (
ps)
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Thermal sensitivity
8
10
12
14
16
18
20
18 19 20 21 22 23 24
Temperature (°C)
Tim
e w
alk
(ps)
Events
Reference
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Vernier linearity
Linearity : 1 ps rms, +/- 1.5 ps
-5-4-3-2-1012345
0 5000 10000 15000 20000
t vernier (ps)
x(p
s)