LIGO-G010064-00-W Interferometer and modecleaner transients during the E2 run Rauha Rahkola and Ray Frey University of Oregon Rick Savage LIGO Hanford.

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LIGO-G W Interferometer and modecleaner transients during the E2 run Rauha Rahkola and Ray Frey University of Oregon Rick Savage LIGO Hanford Observatory LIGO Scientific Collaboration Meeting March 14-17, 2001

LIGO-G W LSC Meeting - March Investigations Modecleaner/IOO Transients – R. Frey »Characterize transient behavior using Data Viewer in real time. » Study in more detail off-line. PSL Frequency Glitches – R. Rahkola, R. Savage »Use J. Zweizig’s PSLmon monitor in effort to identify PSL frequency glitches previously observed using oscilloscope in the laboratory. »Determine if previously observed PSL frequency glitches can be seen in the data channels. H2:IOO-MC_F

LIGO-G W LSC Meeting - March MC/IOO Transients Some MC_F and AS_I transients induced by ground motion. R. Schofield and D. Chin were able to induce similar transients by stomping on LVEA floor, driving over a bump, etc. MC_F LVEA_SEISZ AS_I SEISZ transient preceedes MC_F and AS_I transients by ~ 0.2 sec. MC_F transient peaks ~6 sec. after initial SEISZ Impulse.

LIGO-G W LSC Meeting - March PSL Frequency glitches FSS Fast PMC Error Ref. Cav. RFPD DC -Observed 6/00 in lab at rate of 10’s per second - Eliminated (?) by adjusting NPRO pump diode current by 0.02 amps 200 usec/div. (~3 counts/div)

LIGO-G W LSC Meeting - March Approach Use PSLmon monitor (J. Zweizig) on several PSL channels »Calculate standard deviation for each one second interval »For each second that signal level exceeds a user-defined threshold, generate a trigger at the time of maximum deviation. »Triggers recorded in the LDAS meta-database. »Investigate triggers using GUILD interface (P. Shawhan). Glitches per minute for PMC_ERR_F

LIGO-G W LSC Meeting - March Transients that generated triggers … Saturated signals Mode-cleaner loss of lock

LIGO-G W LSC Meeting - March Transients that generated triggers … Unidentified sources

LIGO-G W LSC Meeting - March Transients that generated triggers … PSL frequency glitch? * Not seen in H2:PSL-FSS_FAST_F as expected.

LIGO-G W LSC Meeting - March Upgrades to monitor/future plans AC couple H2:PSL-PMC_PZT_F channel. (Done) Monitor PSL channels with oscilloscope to see if recent tuning of 10-W laser has eliminated glitches. (No glitches observed on 4/2/01) Suppress triggers when MC is out of lock and when signals are saturated. Reduce trigger rate by triggering on correlated events in two or more channels. Run new monitor (written by R. Rahkola) – check event rate, sample glitches. (not quite ready for E3 run).