I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

European Laser Timing work progress

Ivan Procházka, Josef Blažej (1), Jan Kodet (1,2)K.Ulrich Schreiber (2)

presented at ACES IWG meeting, Neuchatel, Switzerland, June 2014

(1) Czech Technical University in Prague, 119 19 Prague 1, Czech Republic(2) Technical University in Munich, Munich, Germany

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT detector work progress, June 2014

Flying unit is manufactured delay caused by ESA soldering qualification processsolution found

No additional technical problems expected

FM will be compared (detection delay) to theELT Calibration Device before leaving the clean roomexperimental HW under test at CTU

Progress impaired by a re-structuring of a contractor CSRC ltd. company split into two parts - CSRC ltd. Clean rooms, assembly, contract.. - KBmicro ltd. Staff, Electronics, documentation,..

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Detector package - mobile test benchCTU in Prague, June 2014

Honeycomb optical bench

Fibre laser + OPO + SHG laser531 nm, 100 ps, 10 MHz

Focussing optics

Beam splitter

Start detector

ELT detector EM

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Detector package - mobile test benchCTU in Prague, June 2014

Laser power and synch.

Timing system NPET

Optical bench

ELT detector under test

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Detector package - mobile test benchCTU in Prague, June 2014

1 hour

+/- 2 ps p-p

warm up& tuning

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ACES ELT Ground Station CalibrationRequest for Proposal, ESA, March , 2014

The ground station will be characterized by a single calibration value / station

Calibration value computed from - epoch dif. (E2-E1)- geometry distance L

Calibration Device consisting of :- ELT type detector package- Epoch Timing system ET

Epoch E1 recorded using standard SLR system

Epoch E2 recorded using ELT Calibration Device (Detector & Timing device)

Both systems use common time & frequency

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Calibration Device test # 1, WLRS Fundamental Station Wettzell, Germany, February – May , 2014

ELT type detector package in front of SLR telescope distance surveyed repeatedly (< +/- 1mm)

Event timing NPET

Epoch reference “1pps” connected consecutively to SLR and ELT timing systems using identical cable (24 m, LRM240)

20 ps RMSLaser

PD

EG

Detector

ES

L

BS

ET G ET S

1 pps TG

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Calibration Device Performance Test Fundamental Station Wettzell, Germany, February 13-14, 2014

Timing resolution test20 Hz, 10 ps laser FWHM, 8% rate

Jitter ~ 20 ps rms

Dynamical range 0.. 50 % (!!!)within +/- 6 ps half p-p(good for SLR tracking..)

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

20 Hz, 10 ps laser FWHM, 8% rate

TDEV 2.3 ps @ 100 s averaging

100 s series simulating ISS / ACES path in all other measurement

Resulting in ~ 160 raw readings / path = > ~ 140 valid data points

Series to series Stability +/- 1 ps

ELT Calibration Device Performance Test Fundamental Station Wettzell, Germany, February 13-14, 2014

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Calibration Device test # 1, WLRS, March 17 – May 7, 2014 ELT Calibration Long Term Stability

13 ps rms

+/- 24 ps p-p

50 days

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

ELT Calibration Device test # 1, WLRS, March 17 Time Scales Re-Synchronization Effect

re-sync

20 ps

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

The geometrical distance D = 2302 +/-1 mm => one way propagation delay (air) DT = 7673 +/- 3 ps

Statistical spread between groups 1 - 2 ps without re-sync. effects

group to group jumps up to+ / - 20 ps p-p due to “1pps” cabledelay variations / mechanical

Overall mean epochs difference22 952 +/- 13 ps ( worst case est.)

+/- 6 ps omitting outliers

ELT calibration value WLRS ET = 15 279 ps +/- 13 ps

ELT Calibration Device test # 1, WLRS RESULTS SUMMARY

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

CONCLUSION - ELT status June 2014 ELT detector FM being completed (exp. End 2014)

ELT Ground Station Calibration RFP response delivered to ESA start expected mid 2014

The ELT FM delay calibration Test bench assembled and testedFM Calibration Device

expected CSRC Kromeriz, fall 2014

SLR Calibration missions WLRS demo completed May 7,2014 systematic =< 13 ps demonstrated Graz SLR mission planned July 2014

EU 3 x SLR calibrations pre-launch calibrations 2015 mission run calibrations 2016 - ?

Non EU SLR stations which ones ?

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event Timer

New Pico Event Timer NPET based on SAW filter excitation and frequency domain data processing

Extreme timing resolution, stability and linearity Built in generator of synchronous time markers Two channel NPET may be used for phase comparison Key parameters

Timing resolution < 1.3 ps (450 fs) Timing stability (phase) < +/- 50 fs / K (!!) Recording rate 300 Hz (10 kHz) Frequencies 100/200MHz versus

5/10…..200MHz

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event TimerLONG TERM STABILITY

+/- 0.1 K

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event TimerTEMPERATURE DRIFT

200 MHz frequency + passive split, equal cables length

- 40 +/- 50 fs /K

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase Meter based on New Pico Event Timer

200 MHz frequency + passive split, equal cables length

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event TimerTWO MASERS PHASE DIFFERENCE

EFTF 2011, published in IEEE

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event TimerTWO MASERS PHASE DIFFERENCE

To be published in RSI

Wettzell, Feb. March 2014

I.Prochazka et al ,ACES IWG meeting Neuchatel June 2014

Phase meter based on New Pico Event Timer

The device is available for ACES