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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
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A typical CR event ­ pulse height vs time(sample)
A B Slow falloff (80 kHz sampling)

Fast rise GPS time stamp (10 ns resolution) C D

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CR event data format
a raw event record: trigger time stamp: day 159, 03:33:26.682199 UTC
10 26682199 f1590333 fec2 ffba fec6 feaa fec9 ffa9 fecd feb1 fed3 ff9d 445 2bb4 feda fe36 249 21ea ... febc ffb8 fec0 fea5

Sample 1

Sample 2

Sample 3 Trigger sample (0x10/0x08)

a pre-processed record: 2 865308820 682199 7 -10 11 13 14 7 18 20 24 19 1418 11543 31 378 910 9037 gps time: 865308820.682199 Sample 1, etc offset corrected, decimal

...
1 -8 5 8
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Rate vs time: 2/06 ­ 6/07

maybe recoverable

recoverable

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average pulse height vs time (PMT C)

need to check

recoverable

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Data description and access
A web page includes a description of data and detector, and data access: http://physics.uoregon.edu/~rayfrey/LIGO/cosmic/S5_data/CR_S5.html an excerpt:

~100 most energetic events DQ category 4 ?
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