Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Jan. 29 to 5 PM Jan. 30. Also attached are plots of the modes to show when they were running/acquiring data. Dust monitor 10 in the H1 PSL enclosure is still indicating a calibration failure.

The data was taken from h1nds1.
720 seconds worth of data was unavailable on this server
1440.0 minutes of trend displayed

The bracket, which will hold the upper periscope mirror for the ALS system, was installed this afternoon. The attached picture shows the actual bracket installed on the structure with 8-32 screws.



During the installation, one of the threaded holes on the periscope structure (shown as A in the attached picture) was accidentally damaged and hence the screw won't be really tighten any more. The cause of the damage was that --- a lower screw (shown as A in pic) and another lower screw (shown as B) were orthogonally crossing each other in the structure. At first the B screw had been inserted and then the A screw was being tightened. Then I realized that they were interfering with one another, but it was too late. I unscrewed the A screw. However during the removal of the A screw the thread of the hole was mechanically damaged due to the fact that the screw had been bended slightly. The screw can be still in, but it can not be really tight any more. The B screw was removed without serious damage on the threaded hole, though the screw had a clear mark of the A screw. This was then replaced by a new one without a problem. The same situation was found in the upper screws and the issue was avoided by using shorter screws (8-32-3/8"). Currently the A screw is in, but loose. I will remove it tomorrow or later as it doesn't do anything good but it moves around and creates some vibration.

I consulted with Robert about this issue. A main worry was the mechanical stability of the bracket with one screw missing because it may wobble the bracket too much, resulting in unacceptable amount of phase noise in the ALS light (and perhaps even in the PSL main light). The total number of the screws are currently 11 (12 if including the broken one) --- seven of them are on the plane where the B screw is, and the rest of four are on the side where the A screw is. Note that all of the four screws are not shown in the picture. At this point we think that it (hopefully) will not be a matter as we still have so many screws in. We'll see how it goes.

Betsy W. and Arnaud P.

We took B&K hammer measurements on the QUAD installed on BSC1. The configuration during the measurement was BSC1 locked  QUAD unlocked and Vibration Absorbers ON.
The position of the accelerometer and the direction of axis were chosen from LLO measurements, cf picture attached to post 6022.
As for LLO, the hammer trigger threshold was set to 10N.

Two configurations of measurement have been recorded. For each of them, the 3 directions (X Y and Z) were saved from the accelerometer :
-excitation (hammer hit) along the X axis
-excitation (hammer hit) along the Y axis

The TF plots generated by Pulse Labshop have been directly exported to excel then pdf (enclosed). Each figure is showing phase (plot above) and magnitude (plot below) 

Comparing the results to the ones from LLO  (cf post 6022), the only particular thing to mention is the anti-resonnance at 25Hz for the two measurements. 
Otherwise, for the X impact-X response (first pdf, blue curve, 2nd plot), as for LLO we find peaks at 75Hz, 125Hz and 150Hz.
For the Y impact-X response (second pdf, blue curve,2nd plot), as for LLO we find a peak at 75Hz and an anti-resonnance at around 125Hz.

A bit of investigation will be needed before validating that step. 




 
 

(Betsy, Arnaud, some Travis, some Jim, some IAS)

In BSC1 today we:

1) Locked down the ITMy pitch adjustment screws.

2) IAS verified alignment of ITMy (see his alog).

3) Took B&K Hammer measurements with ISI unlocked (see Arnaud's alog).

4) Locked ISI.

5) Locked all ITMy EQ stop nuts.

6) Took B&K Hammer measurements with ISI locked such that we could compare with the LLO ITM data (see Arnaud's alog)

7) Tweeked Top BOSEMs to account for buoyancy.

8) Took particulate samples from surfaces.

9) Wiped sampled surfaces and flooring, pulling towards door.

10) Set 3 witness plates and 2 1" optic flat samples.

11) Took pictures.

12) Confirmed damping of ITMy.

13) Applied First Contact to ITMy-HR

14) Removed the particle counter from the chamber - midday.

A final round of TFs should be taken, and we should confirm that we have the correct B&K data.

I will need to remove the FC on Friday, but as far as SUS is concerned, I see no reason the spool replacement work shouldn't proceed.  I'll need door entrance to the chamber on Friday.

Apollo -> Removed bolts from BSC10's dome and doors.  Rai's hydrocarbon RGA assembly was also removed

Mick and I removed one of the HEPI vertical actuators from the North side of BSC8.  Loosened the other three actuators hardware on the North side ready for removal. 

Complementary filters are used on the HAM-ISI, to blend the signals coming from both the CPSs (Capacitive Position Sensors) and the GS13s (Innertial Sensors). A new set of those Blend Filters was recently created  at LLO, for the ISI involved in the IMC commissioning: HAM2 and HAM3. These filters are more sophisticated than the ones we used in the past. The goal of the update is to maximize the use of the GS13s in low frequency, while still limiting the differential motion injected into the mode cleaner by the ISIs. Those filters are now installed on LHO's HAM2 and HAM3 ISIs, and they were tested today.

Spectra were taken on the cavity length control signals under two configurations (Fig. 1): 
1) ISIs Damped
2) ISIs Damped + Isolation loops Level 2 (UGF=25Hz) applied to the output of the new blend filters mentionned above.
Thanks to the recent progress, and help, of Giacomo and Kiwamu, these plots are calibrated. 

(Fig.2): The motion of the ISIs, along the cavity length(X-axis), was monitored during both phases of the test. Transfer functions were calculated. Amplitude and Phase are respectively close to 1dB and 0deg, on most of the frequency range of the analysis. This is an indication of low differiencial motion injection by the ISIs. Improvements could be made below 100mHz, where the phase goes towards 180deg (opposite motion of the ISIs). However the frequency resolution is not very high there and new measurements should be made for observatins to be more reliable.

(Fig.3): Ground motion was monitored in the LVEA with a STS2 seismometer throughout this test. No relevant shift could be noticed at the input of the seismic isolation chain (ground). This last observation tends to confirm that the changes seen on the IMC legth control signal do not come from changes in the spectral content of the ground motion, but from improvements of the blend filters.

Note: The gain for the IMC lock servo was set to 10dB during this test.
 

The cdswiki web server was not accessible for a period this morning due to its local time drifting too much. We are in the process of configuring NTP via puppet to ensure this does not happen again.

The CBC data quality group have been looking at the noise coming out of the PSL to practice detector characterization for aLIGO. We noticed that there is a significant change in the nature of the PSL spectrum between Jan 29 and Jan 30, 2013, possibly correlated to the PSL reboot. I have attached plots of spectrum of H1:PSL-ISS_PDA_OUT_DQ to show this.

The first plot (viewer-0.png) shows the PSL spectrum from a good time on Jan 29. I have also attached the status of the PSL online detchar channel (ODC) for the same time period (viewer-1.png). The ODC state is all green, indicating that the PSL is functioning correctly and both the ISS and FSS are locked. This spectrum looks good.

However, the PSL spectrum from this morning (Jan 30) appears to have a strong line at 60 Hz with a harmonic at 120 Hz, a new line at 300 Hz, a forest of lines above 500 Hz, and a large bump at 650 Hz (viewer-2.png). I looked at the ODC data to pick 60 seconds where the PSL is locked to make the spectrum (viewer-3.png). The PSL appears to be going in and out of lock much more today. 

I tried picking a time this morning when the PSL was in a good state for a longer period of time. I have attached the PSL ODC plot for 40 mins from 0800 PST (viewer-5.png) which shows that there appears to be a good stretch of data at 0828 PST. The PSD for this time (viewer-4.png) does not have the large bump at 650 Hz, but the other lines are still there.

Is this a known issue with the PSL?

Due to timing system work on Tuesday, the user model and IOP on stormy needed to be restarted.  This was done this morning at about 9:40 PST

At GPS = 1043567822;

Common Mode Board: common gain = 20 db, compensation and 1st common boost on, fast gain = -2 db.

- MC2_M3_LOCK_L filters: gain -1000, FM5 (150:4) and FM8 (CLP100) enabled, limt to 400k.

- MC2_M2_LOCK_L filters: gain = 0.03, FM1 (0.01:0.1), FM2 (0.03:1), FM3 (Stab8:2), FM4 (300:1) and FM10 (ELF80) enabled, limit to 300k.

Attached is a plot of the calibrated IMC control signals for the following relevant control loop settings:

- Common Mode Board: common gain = 20 db, compensation and 1st common boost on, fast gain = -2 db.

- MC2_M3_LOCK_L filters: gain -1000, FM5 (150:4) and FM8 (CLP100) enabled, limt to 400k.

- MC2_M2_LOCK_L filters: gain = 0.03, FM1 (0.01:0.1), FM2 (0.03:1), FM3 (Stab8:2), FM4 (300:1) and FM10 (ELF80) enabled, limit to 300k.

The signals have been calibrated following L1 example. Details on the calibration follow (both for clarity and to check that I correctly interpreted what they has been done at L1).

---- IMC_F ----

- The fast path control signal is directly acquired from the Common Mode Board and becomes the input to the H1IMC-F filter bank (H1:IMC_F_INMON)

- the filter bank contains the following (enabled) filters:

   - "cts2V" that converts ADC counts in volts (0.000610016 V/ct)

   - "InvGenFilt" that compensates for the withening filter at the output of the Common Mode Board (double pole at 10 Hz, double zero at 100 Hz, DC gain = 0.5)

   - "VCO" that accounts for the VCO DC gain (365714 Hz/V, obtained from the test report of unit D0900605-S1200558 and multiplied by 2 to account for the AOM double pass) and filter (pole at 1.6 Hz, zero at 40 Hz)

   - "FtoL" (I added this at H1) that converts the frequency variations dF into equivalent modecleaner round-trip variations dL using dL = dF * L * lambda / c, where L is the length of the IMC (16.47 m nominal), lambda = 1064e-9 m, c=3*10^8 m/s.

---- IMC_X ----

- the output of the MC2_[M3/M2]_LOCK_L filters are input in the IMC-X_[M2/M3] filters bank, respectively

- the MC3 filter bank contains the following enabled filters:

   - "dc_cal" that converts the length actuation into mass displacement at DC

   - "sus_d" that accounts for the TF from force on M3 to displacement of M3 (rescaled for 0 dB DC gain because of the existence of "dc_cal"). Note that this TF has been calculated for L1 in the case of velocity damping; although we are still using velocity damping here at H1, it need to be verified that we are using the same setting that L1 was using when the TF was calculated.

   - "white", a whitening filter (two 0.2 Hz poles and two 1000 Hz zeros) used to get rid of digitization noise. It need to be tken into account when analyzing data.

- the MC2 filter bank contains similar filters, except that "sus_d" is replaced by the combination of "sus_d1" an "sus_d2", that account for the TF from force on M2 to displacement of M3.

- the outputs of both filter banks are summed to estimate the actual M3 motion.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Jan. 28 to 5 PM Jan. 29. Also attached are plots of the modes to show when they were running/acquiring data. Dust monitor 10 in the H1 PSL enclosure is still indicating a calibration failure.

Mark B. and Arnaud P.

Starting TFs with Matlab on ITMy.