MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK ALBERT-EINSTEIN-INSTITUT GEO 600 Data Acquisition System DC Workshop, Golm 2002 -02 -20 Karsten Kötter, Martin Hewitson 2002 -02 -20 Karsten Kötter 1
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT DAQS Schematic 2002 -02 -20 Karsten Kötter 2
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Advancements since 2001 -06 • Hardware • works OK now in desired operating mode • "channel swapping" problem solved • LIGO timing hardware replaced by timing card built in Glasgow • channel swapping not observed ever since hardware replacement 2002 -02 -20 Karsten Kötter 3
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT System robustness • system automatically recovers from • timing signal transmission failures • automatic FIFO flush • crash of datacollector software • "forking" ensures parent process stays alive • reboot of DCUs • automated reconnect after boot up 2002 -02 -20 Karsten Kötter 4
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Hardware • acquisition possible with up to • 16384 Hz sampling rate • 24 bit resolution (limited to ~16 bit by noise) 2002 -02 -20 Karsten Kötter 5
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Relative timing accuracy 2002 -02 -20 Karsten Kötter 6
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT max. resolution (1) 2002 -02 -20 Karsten Kötter 7
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT max. resolution (2) 2002 -02 -20 Karsten Kötter 8
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Hardware "to-do" list • order spare parts • slow channels • testing • timing accuracy against independent clock • data integrity • dependence of effective resolution of AD-conversion on pre-amplifier gain • dominating noise source is pre-amp • noise floor is different for different amplification/attenuation factors 2002 -02 -20 Karsten Kötter 9
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Software (1) • ALL software rewritten since 2001 -05 • easier to configure • all configuration information is stored in database now • configuration changes done by Web-Interface • Lab. View control data included in frames • ~1000 channels at 1 Hz SR • trend data generated • "hour trends" SR=1 Hz • "day trends" SR=1/60 Hz • upgrades in frame-/dataserver functionality • control data • trend data • frequency domain data 2002 -02 -20 Karsten Kötter 10
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Software (2) • new tools to look at GEO data • Data. Viewer • Web Tool to look at data in both time and frequency domain • Lab. View oscilloscope • Oscilloscope / FFT-Analyser functionality • Real time data monitoring in both time and frequency domain 2002 -02 -20 Karsten Kötter 11
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Raw data collection • datacollector • is running for several month now without any problems • database • moved to DAQ server "morgan" for more reliability 2002 -02 -20 Karsten Kötter 12
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT frame builder • is running for several month now without major problems • "hangs" from time to time • might be problem due to nfs-mount over radio link • new sever running framemaker will be located in Ruthe to remedy problem 2002 -02 -20 Karsten Kötter 13
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Data access • frameserver in Ruthe • last 8 days of data available (436 GB capacity) • ? ? days of hour trend data • 110 MByte/day • ? ? days of day trend data • 2 MByte/day 2002 -02 -20 Karsten Kötter 14
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERTEINSTEIN-INSTITUT Data transfer • 1 -slot tape drive available in Ruthe • fallback solution only in case radiolink goes down • 7 -slot-tape drive available in Hannover • will be used for continuous tape writing (transfer Golm/Cardiff) 2002 -02 -20 Karsten Kötter 15
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