J. Kissel, R. Savage, E. Merilh

Having completed the planned suite of high frequency lines (see LHO aLOG 24843), we've moved the PCALX line up to 5 [kHz] in order to completely cover the 1 to 5 [kHz] band. This enables us to quantify the uncertainty in this region as required by the burst group (see T1300950). First attachment shows that the 5 [kHz] frequency region has only one narrow feature, and PCALX's 5001.3 [Hz] line steers clear of it. Second attachment shows the newly accepted SDF diff.

In addition, we've installed two new lines in the PUM and UIM stage of ETMY. This will allow a very precise estimation of each of these stage's strength w.r.t. PCAL, and to confirm they do not evolve with time. The new excitations are piped in to the signal path by re-purposing the pre-existing Pitch and Yaw lockin oscillators; sending their output to every coil on each stage with the same sign in the LKIN2OSEM matrices to create a longitudinal excitation (see attached screenshots). The parameters of these lines are
Stage    Freq (Hz)  CLKGAIN (ct)    Oscillator
EY L3*    35.9         0.11         H1:SUS-ETMY_L3_CAL_LINE
EY L2     35.3         15.0         H1:SUS-ETMY_LKIN_P_OSC
EY L1     34.7         45.0         H1:SUS-ETMY_LKIN_Y_OSC
* This line already exists, and is part of the normal ~35 [Hz] cluster of lines. Third attachment shows the DARM ASD around the now-5-line cluster, the fourth shows the SDF diffs, and fifth shows the screens in which the parameters exist. 

I've chosen the frequencies of the UIM and PUM excitations to match LLO's normal cluster of calibration lines, so as to minimize the impact on Pulsar analysis, which I assume is already excluding these frequencies (and they've already satisfies all other criteria as well). For those who will be concerned, I've confirmed that these extra lines have a negligible effect on the inspiral range (< 1 [Mpc]). These lines are also less than 1% of the typical RMS out of each stage, so there should be no danger of (more) DAC saturation (see 6th attachment).

We will leave these lines on either as long as LLO still needs to get it's high-frequency "sweep" or until tomorrow morning when we solidify any further plan for the low-frequency region.