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July 25, 2007G070526-00-Z R. Frey1 LHO Cosmic Rays in S5 - update Ray. Frey, U Oregon Detector/readout description (brief) Data availability Goal: Determine.

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Presentation on theme: "July 25, 2007G070526-00-Z R. Frey1 LHO Cosmic Rays in S5 - update Ray. Frey, U Oregon Detector/readout description (brief) Data availability Goal: Determine."— Presentation transcript:

1 July 25, 2007G070526-00-Z R. Frey1 LHO Cosmic Rays in S5 - update Ray. Frey, U Oregon Detector/readout description (brief) Data availability Goal: Determine if any association between cosmic rays and GW channel Characterize (or constrain for AdL) Possible mechanisms:  Direct momentum transfer to TM - expected negligible for LIGO I  TM modes excitation (heat) - expected negligible for LIGO I  Perturbation of the electrostatic charge distribution on TM - ?? Rai Weiss, LIGO-T960137 V. Braginski, LIGO-G050457

2 July 25, 2007G070526-00-Z R. Frey2

3 July 25, 2007G070526-00-Z R. Frey3 A typical CR event – pulse height vs time(sample) Fast rise  GPS time stamp (  10 ns resolution) Slow falloff (80 kHz sampling) AB CD

4 July 25, 2007G070526-00-Z R. Frey4 CR event data format 10 26682199 f1590333 fec2 ffba fec6 feaa fec9 ffa9 fecd feb1 fed3 ff9d 445 2bb4 feda fe36 249 21ea... febc ffb8 fec0 fea5 a raw event record: trigger time stamp: day 159, 03:33:26.682199 UTC Sample 1Sample 2Sample 3 Trigger sample (0x10/0x08) 2 865308820 682199 7 -10 11 13 14 7 18 20 24 19 1418 11543 31 378 910 9037... 1 -8 5 8 a pre-processed record: gps time: 865308820.682199 Sample 1, etc offset corrected, decimal

5 July 25, 2007G070526-00-Z R. Frey5 Rate vs time: 2/06 – 6/07 recoverable maybe recoverable

6 July 25, 2007G070526-00-Z R. Frey6 average pulse height vs time (PMT C) recoverable need to check

7 July 25, 2007G070526-00-Z R. Frey7 Data description and access http://physics.uoregon.edu/~rayfrey/LIGO/cosmic/S5_data/CR_S5.html A web page includes a description of data and detector, and data access: an excerpt: ~100 most energetic events  DQ category 4 ?

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