I.Prochazka et al,ACES ELT meeting Spring 2014 European Laser Timing work progress Ivan Procházka, Josef Blažej (1), Jan Kodet (1,2) presented at T2L2.

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I.Prochazka et al,ACES ELT meeting Spring 2014 European Laser Timing work progress Ivan Procházka, Josef Blažej (1), Jan Kodet (1,2) presented at T2L2 meeting, Wettzell, Germany, March 2014 (1) Czech Technical University in Prague, Prague 1, Czech Republic (2) Technical University in Munich, Munich, Germany

I.Prochazka et al,ACES ELT meeting Spring 2014 ELT detector work progress, February 2014 n Flying unit is manufactured delay caused by ESA soldering qualification process solution found n No additional technical problems expected n FM will be compared (detection delay) to the ELT Calibration Device before leaving the clean room n 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 ELT meeting Spring 2014 ACES ELT Ground Station Calibration Request for Proposal, ESA, March 11, 2014 n The ground station will be characterized by a single calibration value / station n Calibration value computed from - epoch dif. (E2-E1) - geometry distance L n Calibration Device consisting of : - ELT type detector package - Epoch Timing system ET n Will be kept stable (delay) within entire ELT mission 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 ELT meeting Spring 2014 ELT Calibration Device test # 1, WLRS Fundamental Station Wettzell, Germany, February 13-14, 2014 n ELT type detector package std. holder with ref. point n Event timing NPET, cabling, sw package, PC n Installed in a dome in front of a main telescope (off axis), distance surveyed repeatedly (< +/- 1mm) 20 ps RMS

I.Prochazka et al,ACES ELT meeting Spring 2014 ELT Calibration Device test # 1, WLRS Fundamental Station Wettzell, Germany, February 13-14, 2014 n 20 Hz, 10 ps laser FWHM, 8% rate n TDEV s averaging n 100 s series simulating ISS path in all other measurement n Resulting in ~ 160 raw readings / path = > ~ 140 valid data points n Dynamical range % (!!!) within +/- 6 ps half p-p (good for SLR tracking..)

I.Prochazka et al,ACES ELT meeting Spring 2014 ELT Calibration Device test # 1, WLRS February 13-14, 2014 n Geometry – independent survey n Two different scales n Two independent surveyors n Three series each n ELT detector versus WLRS reference points D = / - 1 mm n Comparison to Wettzell survey TBD SLR mount top view

I.Prochazka et al,ACES ELT meeting Spring 2014 ELT Calibration Device test # 1, WLRS RESULTS SUMMARY n The resulting distance D = /-1 mm => one way propagation delay DT = /- 3 ps n Statistical spread between groups 1-2 ps without re-sync. effects n group to group jumps 3 to 20 ps p-p due to “1pps” cable delay variations / mechanical n Overall mean epochs difference /- 13 ps half p – p +/- 13 ps is a worst case estimate +/- 6 ps is a typical value n ELT calibration value DT = ps +/- 13 ps half p - p re-sync 20 ps

I.Prochazka et al,ELT meeting Spring 2014 CONCLUSION - ELT status march 2014 n ELT detector FMbeing completed (exp. End 2014) n ELT Ground Station Calibration RFP response delivered to ESA start expected mid 2014 n The ELT FM delay calibration FM  Calibration Device expected CSRC Kromeriz, fall 2014 n SLR Calibration missionsWLRS 1 st demo February 2014 systematics =< 13 ps demonstrated Graz tests expected July 2014 n EU 3 x SLR calibrationspre-launch calibrations 2015 mission run calibrations ?

I.Prochazka et al,ELT meeting Spring 2014 ACES IWG meeting Neuchatel, March 13, 2014 n Problem ACESHydrogen maser out of specs no way to improve the design (schedule & budget) n frequency stability ~ 4 * n drift ~ X * / K n drift ~ X * / orbit (magnetic) n Solution proposedtemperature and mag.field sensors built in drifts measured and sw models implemented n Problem ELT n no information about phase /delay/ changes n IP was asking repeatedly for data & info – no response (Timing will be seriously influenced by phase drifts !) n Obviously the ACES community is not aware of this problem. n What next ? !