LIGO-G060469-00-Z Introduction to RayleighMonitor Patrick Sutton LIGO - Caltech.

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Presentation transcript:

LIGO-G Z Introduction to RayleighMonitor Patrick Sutton LIGO - Caltech

LIGO-G ZSciMon Camp LLO Outline of Talk l Introduction to RayleighMonitor l Reading Rayleighgrams l Running RayleighMonitor

LIGO-G ZSciMon Camp LLO l DMT monitor that produces scrolling time-frequency plots of the mean and variability of the power in a specified channel: RayleighMonitor constantnoise power varies M st.dev.(PSD)/mean(PSD) glitch! mean(PSD)

LIGO-G ZSciMon Camp LLO RayleighMonitor Algorithm l Makes a set of short-time power spectra. Calculates the mean  and the standard deviation  of the power spectrum in each frequency bin. Ratio R :=  is an interesting statistic: »R = 1 is what you expect for Gaussian noise. »R < 1 indicates coherent variation. (lines). »R > 1 indicates glitchy data.

LIGO-G ZSciMon Camp LLO Example: Whitened PSD The noise power in (200,300)Hz and in 60Hz line has dropped since the monitor started. “Whitened” power spectrum of H1 AS_Q data (-whiten option)

LIGO-G ZSciMon Camp LLO How to read a Rayleighgram Same data, Rayleighgram. Sub-second glitches (not obvious in power spectrum) Coherent noise around 150, 180Hz.

LIGO-G ZSciMon Camp LLO Example: L1 in S5 look pretty clean, but …

LIGO-G ZSciMon Camp LLO Example “whitened” PSD shows non-stationarity on few-seconds scale

LIGO-G ZSciMon Camp LLO Running RayleighMonitor l Instructions under S5 homepage l From a control room computer at LLO: »xhost + »ssh (password on back of whiteboard). Once on delaronde: »cd Rayleigh_L1 »./start (to start RayleighMonitor) »./stop (to stop RayleighMonitor)

LIGO-G ZSciMon Camp LLO Editing the Configuration File l The config files for setting parameters are simple (there’s also help documentation!) l RMconfig.txt looks like: L1:LSC-AS_Q low freq. Run this many time steps before quitting Length of each data segment (s) = 1/ freq. resolution Number of segments to average per pixel high freq.channel

LIGO-G ZSciMon Camp LLO If you’re really interested… l RayleighMonitor would really benefit from a few additional features: 1.Ability to automatically locate old data at the sites and run on requested GPS times. Currently, if you want to run on past data, you have to locate it yourself (this feature could be based on the FrameCacheQuery command). 2.Special code for –fast plots is unstable. It would be great if the instability could be removed. 3.Better yet would be speeding up the much more versatile -slow plotting code (in which case the beer’s on me). l Contact