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Advances in GEO600 Data Acquisition System: Enhancements and Reliability Improvements

This workshop presented by Karsten Kötter and Martin Hewitson on February 20, 2002, highlights significant advancements in the GEO600 Data Acquisition System (DC) since June 2001. Key improvements include hardware upgrades, resolution enhancements, and robust reliability measures to prevent data loss. The system now features automated recovery protocols, higher sampling rates, and advanced software tools for easier configuration and real-time data monitoring. These developments ensure the GEO600 operates effectively and maintain high data integrity, crucial for ongoing scientific research.

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Advances in GEO600 Data Acquisition System: Enhancements and Reliability Improvements

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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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