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GEO600 Data Acquisition System

GEO600 Data Acquisition System. DC Workshop, Golm 2002-02-20 Karsten Kötter, Martin Hewitson. DAQS Schematic. 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

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GEO600 Data Acquisition System

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  1. GEO600Data Acquisition System DC Workshop, Golm 2002-02-20 Karsten Kötter, Martin Hewitson Karsten Kötter

  2. DAQS Schematic Karsten Kötter

  3. 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 Karsten Kötter

  4. 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 Karsten Kötter

  5. Hardware • acquisition possible with up to • 16384Hz sampling rate • 24bit resolution (limited to ~16bit by noise) Karsten Kötter

  6. Relative timing accuracy Karsten Kötter

  7. max. resolution (1) Karsten Kötter

  8. max. resolution (2) Karsten Kötter

  9. 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 Karsten Kötter

  10. 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 • LabView control data included in frames • ~1000 channels at 1 Hz SR • trend data generated • "hour trends" SR=1Hz • "day trends" SR=1/60Hz • upgrades in frame-/dataserver functionality • control data • trend data • frequency domain data Karsten Kötter

  11. Software (2) • new tools to look at GEO data • DataViewer • Web Tool to look at data in both time and frequency domain • LabView oscilloscope • Oscilloscope / FFT-Analyser functionality • Real time data monitoring in both time and frequency domain Karsten Kötter

  12. Raw data collection • datacollector • is running for several month now without any problems • database • moved to DAQ server "morgan" for more reliability Karsten Kötter

  13. 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 Karsten Kötter

  14. Data access • frameserver in Ruthe • last 8 days of data available (436 GB capacity) • ?? days of hour trend data • 110MByte/day • ?? days of day trend data • 2MByte/day Karsten Kötter

  15. 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) Karsten Kötter

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