Alignment DOF "slider to match M3 BOSEMs during recent short locks", "slider when last getting short locks" MC1 changed the most, MC2 and MC3 are essentially the same. MC1 P 308, 334 Y -921, -895 MC2 P 453, 450 Y 238, 240 MC3 P 224, 224 Y -1009, -1006
Mark B and Travis.
Travis installed the top level OSEMs and retracted them fully. The OL values with gains and offsets are:
prettyOSEMgains(logOLs('X1','QUAD'),'QUAD')
M0F1 -25790 -1.163 12895
M0F2 -29266 -1.025 14633
M0F3 -30618 -0.980 15309
M0LF -24822 -1.209 12411
M0RT -25030 -1.199 12515
M0SD -21983 -1.365 10992
R0F1 -28836 -1.040 14418
R0F2 -22844 -1.313 11422
R0F3 -25991 -1.154 12996
R0LF -26764 -1.121 13382
R0RT -24718 -1.214 12359
R0SD -22399 -1.339 11200
To get this to work I had to add X1 support to both the Matlab functions.
Doug and Jason worked on monuments. The Apollo crew worked on modifying the fourth leg of the Test Stand cleanroom. Gerardo and I looked at cleanrooms and space available for cryo-pump baffle assembly and install. The Test Stand cleanroom is big enough for assembly and there appears to be enough room for the Balancing Jig in the BSC cleanroom on the far side of the tube. We will take the precaution of covering the concrete floor in that area with CPStat (to mitigate particulate generation) since it has no vinyl.
Phase 3b spectra have been measured on the beamsplitter after Jeff Kissel implemented the new filters.
The attached pdf are showing a comparison between spectra taken in March 26th phase 3a (in blue), and May 17th phase 3b (in green) with the suspension damped (first pdf) and undamped (second one). The ISI was damped.
Data, measurement lists and figures have been commited on the svn
Attached are spectra from the beamsplitter under vacuum (phase 3b) comparing damped and undamped spectra for M1 and M2. Damping looks to be working fine for all dof, except in yaw, where it increases the motion (page 12 of first pdf and page 7 of second pdf). Those spectra have been taken with a gain of -2 in L and P (as it has been used during HIFO-Y) and -1 for the other dofs
Attached is a performance spectra of the beamsplitter, plotted with osem sensor noise. The spectra compares H1 BS in chamber, in air, with no ISI isolation, suspension damped, and L1 BS in vacuum with ISI and suspension damped.
Robert Schofield is performing vibration measurements on the X1 beam tube at the mid point (1000m).
To facilitate these measurements we asked our contractor to remove ~60 meters of insulation exposing two complete beam tube sections between two bellows.
These needed to be restarted after the network work (switch maintenance and fiber cleaning). I burtrestored them to May 19, 00:00.
(Cheryl, Chris) In order to set the Gouy phase of the beam on the IMC WFS, we used the NanoScan to check the beam profile after the L3 lens on IOT2L. Compared to a previous beamscan at this location (alog 5131), it looks like we still have essentially the same beam. Both the horizontal axis and the vertical axis were measured -- and they differ slightly about where we should place the WFS. So we will split the difference and place the WFS in between the two indicated positions. The attached plot shows the measurements, the fits, and the magnitude of the disagreement, which amounts to +/- 10 degrees of Gouy phase. The upper panel plots the 1/e^2 radius, and the lower panel plots the Gouy phase accumulated from each profile's waist. The vertical lines correspond to the ideal WFS positions, as indicated by each measurement. (We want to put the WFS at +/- 1 Rayleigh length from the waist, for a Gouy phase difference of 90 degrees. At the intermediate position, one profile gives 81 degrees difference and the other gives 98.) Also to note: the beam path wasn't quite level when we started -- so we had to temporarily remove both L2 and L3 lenses, and touch the M6 steering mirror in order to fix it. As a result, the MC REFL PD has to be realigned (we'll take care of this today along with placing and aligning the WFS).
IP1 and IP2 were found to be at course vacuum (~1-15 torr) yesterday after aLIGO removal, years of storage and subsequent re-installation. We had "roughed" them out yesterday, started their HV but had left them only partially open to the vertex volume overnight.
The timing on h1seitst has been corrected by replacing the IRIG-B card and attaching the IRIG-B signal to the proper connector. There are still IPC errors, these may be model related? The Dolphin network is attached and appears to have initialized correctly.
All switch maintenance tasks described in WP 3907 are now complete. sw-msr-gc, sw-msr-ops, sw-msr-server1, and sw-lvea-aux0 were all rebooted to update to IOS v15.0(2)SE2 and apply the configuration changes required to enable jumbo frames. The trunk configuration for sw-lvea-aux1 was corrected so that this switch could then be added to the VTP domain.
Found that main file server cdsfs0 had become read-only. Restarted at 9:06 AM PDT.
(Kyle, John, Gerardo)
IP1 and Ip2 were open to the vacuum system yesterday by 4:00 pm.
An aux cart was used to pump down both ion pumps before their HV was enabled.
No problems to report.
Spectra on ITMY have been measured after implementing the damping filters recently designed (see aLog 6949)
The attached file shows measurements with the suspension and ISI damped for each level (M0/R0/L1/L2)
As described in the previous aLog for the same measurement on ETMY (see aLog 6432) the effect the filters should provide above 10 Hz is not visible.
Looking at p22 of the attached pdf, an interesting resonance with a high Q appears at 7Hz for roll, vertical and transverse dofs. A new spectra will be taken tomorrow, to confirm its existence.
The data, pdfs, and measurement list in plotallquad_spectra.m have been commited to the svn.
Plotquad_spectra.m and plotallquad_spectra.m have been modified to automatically scale the plots, depending on the boundaries of the data.
Spectra on ETMY have been measured after implementing the damping filters recently designed (see LLO aLog 6949)
The two attached files are showing measurements respectively with the suspension damped and undamped.
For each of them, three spectra have been measured at LHO :
The improvement provided by the new filters is not visible when comparing blue and red in the first pdf since the signal is drowned in noise from 10Hz (eg p19 of […ALL_Spectra_Don.pdf] representing the motion between the structure and M0 in longitudinal). The difference seen between the two curves is certainly due to the input motion that was different for the two measurements, as we can see on the second pdf when comparing blue and red for damping off (eg p22 of […ALL_Spectra_Doff.pdf] representing roll for M0).
Although, the difference between the two states of the ISI is clearly visible on every stages of the suspension, when comparing red and green (eg every page on […ALL_Spectra_Don.pdf]). The motion (in longitudinal) between the main chain and the reaction chain at L2 stage is reduced by a factor of 100 @ 1Hz when the ISI is isolated (eg p36 of […ALL_Spectra_Don.pdf]).
The data, pdfs, and measurement list in plotallquad_spectra.m have been commited to the svn
Attached are plots of dust counts requested from 5 PM May 19 to 5 PM May 20.
EY: Vacuum controls signals working. FMCS is connected. The H1 FE-LAN is connected. The Cisco is running which provides HEPI pump controller signals.
There are no other connections at EY, which includes the timing, so no front ends are running correctly.
EX: All Back. Vacuum signals available, not all being trended by EDCU at time of writing. FMCS all back.
We will restore the rest of the EY systems Tuesday morning. Will require restart of front ends and DAQ.
All PEM DAQ channels look bad at the moment. Will require full system reboot to recover, will be done Tuesday morning.
I replaced the annulus ion pump controller. The issue with this system was the ion pump controller did not want to turn on the HV, so tried the DB connector with the shorted pins, did not work. Swapped it and the ion pump turned on.
GV1 annulus system is pumping on its own, cart was removed on 5/16/2013. Aux cart was moved to BSC01 annulus ion pump system.
Betsy swapped in a new BOSEM for M0 F1, so I updated the OL/offset/gain measurement:
M0F1 -20369 -1.473 10184
And serial number updated to:
M0F1 619
The attached OSEM chart has been updated with the new offsets and serial number values.