SudarshanK, RichardS
We moved the Pcal beam back to their optimal position at 111.6 mm away from the center of the optic. The actual position of the current Pcal beams (last column) along with the history of where they were are in the table below. The number quoted on the table are distance of Pcal beam (in mm) from their optimal position of [0, +/- 111.6] mm.
| Before 07/25/2017 | 07/25/2017 | 08/01/2017 | 08/08/2017 | |
| Upper Beam | [1.9, 0.3] | [2.5, -8.4] | [1.1, 14.5] | [0.8, 0.6] |
| Lower Beam | [-1.0, 0.3] | [-1.3, 8.6] | [-0.5, -14.1] | [-0.8, -0.2] |
We also re-centered the Pcal beams on the receiver side to relieve it from any clipping that was happening outside the vacuum. The spectra attached below shows no significant clipping on the Rx beams.
We will run a set of calibration lines (from 4501.3 - 1501.3 at 500 Hz interval) with this Pcal beam configuration for about a week.
After this Pcal beam configuration change, we turned on the two Pcal lines at 333.9 and 1083.3 Hz using Pcal at ENDX. We will collect about 2-3 hours worth of data after we acquire the lock and turned them off. We plan to initiate the HIGH_FREQ_LINES guardian node to acquire data at high frequency after that.