A new version of gds software has been installed for Ubuntu and Mac OS X workstations.  The notable differences appear in foton and diaggui.

Widgets for displaying channel names have been made much wider, forcing the layout of several screens to be changed.  Diaggui measurement tab now shows 2 columns of channels instead of 3.  Diaggui excitation tab has two channel name widgets for each excitation, the wider length required these to be put on separate lines.  The plot options panel on the result tab is also wider to accomodate long names - this affects foton as well.  Since the plot options panel is wider, there's less room for the actual plot, but the option panel can be detached so it "floats" which should allow plenty of room for the plot.  The Export popup dialog in diaggui also has channel name fields that have been made wider, and there's now an option to add a header to the ASCII export file.  The header contains information to allow identification of the source of the data.

Complaints should be addressed to me or filed with bugzilla.

Measurements to begin at ~9:00 PM PST.

Attached are plots of dust counts > .5 microns in particles per cubic foot.

ScottL & HughR

Payloaded HAM1 Optical Table per D1200524.  This is 310lbs which stays on in place plus 40lbs to substitute for the ISC equipment that will eventually go onto the Table.  I've got the Table level to ~+-0.15mm but the elevation is low by 15mm.  We'll continue to work this Tuesday.

Hand brushing of the upper chamber was completed this morning. Half of the BSC flooring was stacked to expose half of the lower chamber: both pneumatic and hand brushing were completed on the exposed half. The flooring was replaced and the other half stacked to expose the other side of the lower chamber.

I tagged the four large (pallet-sized) storage units in the West Bay. I replicated the system that Hugh and I worked out for the Mechanical Room storage units, back in the day. The storage units are each assigned a letter, the shelves are numbered, and then the shelves are sub-divided into sections (left, center, right). This should facilitate input of ICS storage locations. When putting info into ICS use the following format for location/sub-location: LVEA/WBSU X-Y-Z where X is the letter assigned to the storage unit (A,B,C,or D), Y is the shelf designation (Floor, 1,2,3,4,or 5), and Z is the shelf sub-division (L,C, or R). For example, I have cleanroom materials on Shelving Unit B, shelf 2, left side so my ICS entry would be: LVEA/WBSU B-2-L.

[Aidan, Jax]

Over the weekend, we ran a final series of cavity scans with the updated ring heater driver. The ETM ring heater was operated at 450 mA/13.2 W from 17:55 PST on Friday Sept 14 until 19:25 PST on Saturday Sept 15. Cavity scans run approximately every 90 seconds over the range [36,76] kHz every 20 Hz. The amplitude and phase respones were averaged over 500 oscillations. Cavity scans were also performed after the ring heater was turned off, but the cavity was unusually noisy so the data in the cool down period is unusable.

The frequency of the LG10 mode was tracked over this 24h period. The attached plot (modal_spacing_analysis_v2_frequency) shows the change in frequency over time. The spacing of the LG10 mode is two times the modal spacing in the cavity.

The modal spacing, cavity g-factor, and mirror radius of curvature were also calculated and plotted. They are attached as _modalspacing, _gfactor, and _radcurv, respectively.

35W beam. The laser room HEPAs, lights, and AC units were turned off and the make up air was set to 50% for these measurements. The anteroom lights and HEPAs were still on.

(Suresh Doravari, David Jones mainly [& myself a little])

Suresh was onsite for the last two weeks to assemble as many Tip Tilts as he could (Suresh is from LLO, but we have all the hardware here).  Each interferometer requires a total of (6) Tip Tilts.  As of late Friday (9/14) afternoon, Suresh completed all Tip Tilts for LHO & LLO, and completed 2 (of 6) for India.  He wanted to finish all of them, but he was missing some hardware, so he completed the remaining Tip Tilts as much as he could.

We bagged and tagged all of these assemblies on Fri afternoon.  I'll be sending him the LLO batch.  The LHO batch and other assemblies will be stored in the Staging Bldg Optics Lab in the meantime.  Suresh will be back to finish building these assemblies.

Check ResourceSpace for photos of last week's stack installation at HAM1.  Thanks to Bubba for pics of the optical table going in.

I shouldn't influence HAM3 activities today since I have all of the TFs/Spectra data on MC1 now.

Luke, Deepak, Cheryl, Alex, Rodica

Last week we finished assembling and aligning the IO Faraday isolator on the H1 PSL table. A little more ghost beam hunting is needed, but once all the stray light is contained, the system is ready for high power testing. Without the DKDP crystal yet installed the isolation is 47.8-49 dB, with 96-98% in the returned REFL beam (98-99% transmission assuming equal losses in forward and backward directions) for 500 mW to 9 W incident power. The forward extinction (incident to forward rejected) is >30 dB, and could be improved even further with some more careful finetuning.

The following steps are suggested for high power testing:

- quantify the power in all ghost beams and make sure they are blocked properly

- measure and finetune isolation / transmission up to 150 W without / with DKDP

- measure thermal lensing

The water cooled power meter needs to be moved to measure the powers in REFL and incident beams. Also, it helps if two low power Ophir power meters are used to simultaneusly check isolation and transmission. 

Thanks to everyone at LHO for their great help and support with this!

[Jeff B, Stuart A]

Jeff B posted Phase 1b M1-M1 TFs for PRM (HSTS) in LHO aLOG entry 4195. These recent TFs from 2012−09−06_2000, with damping OFF, show a Y to T coupling at 1.1 and 2.05 Hz. This coupling goes away with damping ON, as can be seen in the TFs from 2012-09-10_0900.

Jeff K had made some comments regarding the nature of this Y to T cross coupling in LHO aLOG entry 3831, outlining possible scenarios for how it could be caused. 

As a consequence, it was requested that Jeff B switched the "side" of the SD BOSEM [i.e. +T] to the opposite side of the PRM structure [-T], and accordingly change the sign of the SD BOSEM gain in the OSEM OUTPUT FILTERS, from -1 to +1.

Following these changes, repeat TFs were taken Friday afternoon for just the T DOF.

A comparison plot showing the TF for the T DOF both before and after swapping the side location of the BOSEM is available below. Pot Key:-

Blue Trace   = Model Prediction
Orange Trace = X1 PRM M1 (2012-09-06_2000) - SD BOSEM on as-built side
Black Trace  = X1 PRM M1 (2012−09−14_1700) - SD BOSEM on opposite side

It can be seen that swapping the side location of the BOSEM appears to have mitigated the Y to T cross coupling!  

n.b. all data, plots and scripts have been committed to the sus SVN as of this entry.

Sno Valley on site
James B. restarted the CDS filesystem
Vincent restarted the H2 DAQ

Attached are plots are dust counts > .5 microns in particles per cubic foot. Also attached are plots of the modes of the dust monitors to show when they were running.

For 20 minutes (from Sep/14/2012 23:56-ish to Sep/15/2012 00:14:15 UTC), one arm was locked with WFS, without excitation/ring-heater, with PSL, before Aidan started injection.

PSL HEPAs, make up air, and ACs were all fully ON.

Anyway, while talking to Aidan I noticed that it was not as glitchy as the day before, and close to the end of the above mentioned period there was a few glitch-free time long enough to capture 8 averages BW=0.094Hz spectrum with dtt, that's whopping 72 seconds of glitch free time per each spectrum!

OK, nothing to be excited about, they (red and blue) look mostly the same as the best-ish data with refcav in the optics lab (green). PSL might be slightly (e.g. 2 dB) better between 1 and 2 Hz.

A cavity scan in running overnight on the single arm with 13.2W of power going into ETMY from the RH.

The RH was turned on around 17:45 PDT. I've turned off the WFS servos and have a dither script running intermittently to take care of the alignment.