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Interferometer_sensitivity_studies (General)
fiori, ruggi - 16:19 Wednesday 01 June 2011 (29519) Print this report
0.05Hz comb and Ti?
The dense comb of lines around the VELA is well coherent with signal Ti_IRIGB_spare_50Hz (Figure 1 and 2). This suggests for som kind of relationship with the Timing system.

As Paolo noticed the "comb" noise onset between the lock of May 23 around 12:00 (<1hr long) and the following one of May 24 (starting at 16:15 UTC). See Figure 3. See also Noise around Vela (22.38 Hz).

Several activities were performed during this long break, including the
cleaning and covering of EDB, a full infrastructure maintenenace and sofware interventions. Some of these were somehow related to the Ti system and data acquisition:
- starting of the new (Slow monitoring Data from HRTM Tilmeter)
- a number of restarts of TiMoni (see Operation report - Morning shift and Operation report - Afternoon shift)

- one crash of Olserver34 which required restarting several processes (see Operation report - Morning shift).

A temporary stop of the new Tiltmeter server is suggested as a test, as soon as possible.
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