J. Kissel, K. Venkateswara

The ion pump current this morning was 0.25 mA, which should correspond to a pressure of ~ 5E-7 torr. Looks normal so far and the low pressure should ensure a long lifetime for the pump (~ 5 years).

The data from Tuesday night looks quite good. Unfortunately, we forgot to reset the filters FM1 and FM2 (described in alog 13448 ) for the transfer function correction. This is why the BRS/tiltmeter resonance is visible in Tuesday nights data.

The first plot of the first file shows the ASD of the reference mirror, BRS, STS and the PEM Guralp seismometer. The plot below it shows the coherence between BRS and STS. The wind speeds were about ~ 10 mph.

The second file shows a comparison of the ASD's from Monday and Tuesday nights for the BRS and the STS. There is a clear elevation of the noise floor between few mHz to ~ 0.6 Hz on Tuesday compared to Monday.