Gerardo and I glued the first sapphire prism to the LASTI PUM mass which is intended to be used in an H2 one-arm QUAD in the near future.  (Note, the ears were bonded to this mass at the on 8/31/11.)  All went well, and heat lamp curing is proceeding until tomorrow.  After 2 hours of heat-lamp heating, we used the FLIR thermo camera to see if we could "see" what temp the glass/glue joint was at.  This was difficult to see as there is a lot of fixturing around the bond to hold the prism in place during the first 12 hours of curing, but it seemed that the glass on the flat was running around 33 deg C, with the PEEK prism holder running at ~38 deg C.  Ideal EP30 curing temp is a minimum of 40 deg C.  We adjusted the lamp and hope it continues to rise in temp.
Prism s/n 11 was glued to flat s4 (see picture).

Andres moved the 10 FMy BOSEMs on M1 and M2 in to 50% OLV today.  If anyone is available to run the diagonalization, please feel free (ehem, Jeff or Jeff).  Otherwise, we'll try to get to it ourselves in the next day or so to home in on the perfect BOSEM alignment.

The beginnings of the weekly, but expanded to be capture current status as of this afternoon (Angus, Giles, Travis, Gary, Betsy, Norna):

In the last week, we dismounted the ITMy main chain metal dummy masses and installed the glass PUM and ITMy optic.  See Resource Space for pictures of the maneuvers which utilized the ergo arm.  Roll, pointing, and positions of the masses were adjusted in the structure such that the ITMy and PUM were in proper orientations relative to each other for fiber welding.  The newly introduced loop segment on the PUM showed a reproducible pointing from the metal hang at that stage.  Weld equipment from the LSB fiber lab was moved in numerous loads to the LVEA fiber lab and fit checked.  The welder and chiller were hooked up and alignment was checked.  Fibers in storage tubes have been moved to the LVEA.

During these operations, it was noticed that there was a small chip on one of the PUM Ear horns.  Since the chip was determined to in-fact be a chip and not a fracture, Angus and Giles annealed the area to repair/smooth out the imperfection.  Note, the ears can be reused roughly 3 times (in the event of fiber or weld failures) provided that there is not a fracture or damage higher up in the ear, so this smoothing operation is a somewhat known technique.

Welding commenced on the ear late in the afternoon with the first weld operation attaching a fiber to an aLIGO monolithic suspension!  (There are 8 welds on a suspension to attach 4 fibers, so stay tuned...)

(Jeff B., Craig, Virginio)

Finished the assembly of the wires+clamps to suspend the payload.

Wires are now all attached to the suspension.

Finally, we found the dummy payload still sitting inside a wooden crate in the Y End Station
Unfortunately, it hasn't been cleaned yet. Maybe, we can class B clean only the parts that go 
into direct contact with the wires' clamps. This will require a small oven for the baking 
instead a big one which is at least 34" deep, and maybe this will save us some time.

Virginio

BBland, GMoreno

Today, we went to the bonding lab intending to glue the TCP SST prisms to the glass barrel.  However, because this requires a heat lamp cure very near where there were some FC/PEEK mesh tabs (left over from transport?), we needed to remove them.  When I went to pull them off, we immediately noticed that the PEEK mesh was not sunk into the FC enough to get the edge to peel (see picture attached).  As well, there some brush strokes outside of the base FC "puddle" which were also not attached to the PEEK mesh, therefore not coming off with the pull.  So, we had to reapply the FC around the edge and let it dry (another 8 hours, as per the FC procedure), and abort the prism gluing.

• Chamber cleaning in HAM7
• PSL wiring, cable tray, water pipe work
• Fiber welding in West bay

Keita, Sheon

The L1 OMC and Lesco Mark III UV lamp (ALOG LLO post) arrived on site at Hanford today.

The L1 OMC (large shipping) container remains unopened. The UV lamp box was opened, within contained the module and foot switch, but no flexible lamp-head - perhaps it is within the OMC box?

Both are now stored in the OSB Optics Lab.

- Lots of visitors, for SUS, fiber pulling, TMS assembly, and HR program

- Reiboldt working on roof of H2 PSL

- Mount's Lock and Key, Stoneway Electric on site

- Patrick working on dust monitors in the LVEA

- H1 was running (stays locked through Detect) today during Laser Safe operation. Squeezers transitioned to Laser Hazard at ~18:15 to access beam enclosures.

- H1 TCSY flipper M2 alarmed but that's OK, as no laser power is being transmitted

- EY: HEPI pumping ongoing

Taken picture of the TMS ISC table to survey the components already mounted on the table

What it is  clearly missing are the two periscopes, the glass baffle, the glass beam dump, and some connectors.

Picture of the underside of the table should show that all the ballast masses are there

The total current weight of the table is 52.5 kg  (Keita)

(Craig, Virginio)

Mount wires from upper blades to suspended mass without any particular issues

Tablecloth earthquakes stop screws were at the end of their travel to be able to secure the clamps.

We will need to lower the upper blade's tips by about 2 mm to secure completely the clamps to the mass

   

(Andreas, Jeff B., Craig & Virginio)


Modified the jig to string the wire, see pictures 

Nominal load  146lbs = 66.36kg => used 66 kg (nominal values read on the weights)

Wire music steel wire diam  1.1 mm 

Distance between the aluminum parts the hold the clamps (425 +- 0.3) mm ( see picture) 
Used two 10 mm spacers to get to 425 mm. This should bring the clamps'  distance to 455 mm 
as shown  in drawing 

https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=63179.
  
We need to design a couple of parts to have a better way string the wires.

The "quadrapuss" cable type (D1000234 - 125") coming from M1 SD and RT was changed from S/N 901 to S/N 903.  There was an issue with the readout of the OSEM.  The new cable was routed through the same path on the FMY structure, and the readout was confirmed in the medm.

In the interest of time, using good 'ol foton, I've installed the basic electronics compensation and damping filters that we've been using thus far to commission the BSFM/QUAD in the assembly area, since it's basically the same electronics. These include (notation is [zeros:poles], every filter has a gain of 1).

- In the M1 OSEMINF banks, compensation for the analog whitening in the Satellite Amplifiers, a [10:0.4] dewhitening filter.
- In the M1 COILOUTF banks, compensation for the analog dewhitening of the "acquire" state of the TOP coil driver. a [1:31] anti-dewhitening filter (note, as with the QUAD, there is an additional state [1,1:10,31], but I have not yet installed that filter)
- In the M1 DAMP banks, the same simple damping loops that have been inherited from the LASTI QUAD; a differentiator with a cutoff ([0:20,20]), and the 50Hz elliptical filter.

Now that these filters are installed, as soon as the M1 BOSEMs are restored to the middle of the range, and properly diagonalized, we *should* be able to close damping loops (though it should be done cautiously at first!!).

 

Betsy & Co had left H2SUSFMY with it's OSEMs entire backed off from their flags, such that they read "open light" currents. At her request, I've installed the "proper" offsets and gains to compensate for these open light current values (on both M1 and M2), such that the OSEMINF_*OUT channels are nominally 0 when the flags are in the middle of the OSEM's range. Tomorrow, the OSEMs will be physically set to there nominal range using these newly conditioned signals.

I don't think all of the M2 BOSEMs are truely open light, as they should register in the 
(62+/-20)e-6 [A] * 240e3 [V/A] * 2 [V/V] * 2^16 / 40 [ct/V] = (24e3+/-7e3) cts
and for example, UL is showing 7e3 counts. When we're confident that the M2 BOSEMs are open, then we should repeat the process detailed below.

"How To" Details
I measured the open light current using the inputs of the OSEMINF filter banks (i.e. the raw signal just as it comes off the ADC) using tdsavg -- a quick command line tool that takes the average of a channel for a specified duration. The command and results are:

controls@cdsws2:~ 0$ tdsavg 30 H2:SUS-FMY_M1_OSEMINF_F1_IN1_DQ H2:SUS-FMY_M1_OSEMINF_F2_IN1_DQ H2:SUS-FMY_M1_OSEMINF_F3_IN1_DQ H2:SUS-FMY_M1_OSEMINF_LF_IN1_DQ H2:SUS-FMY_M1_OSEMINF_RT_IN1_DQ H2:SUS-FMY_M1_OSEMINF_SD_IN1_DQ
28331.1
27269.3
30542
27143.1
28230.5
21085
controls@cdsws2:~ 0$ tdsavg 30 H2:SUS-FMY_M2_OSEMINF_UL_IN1_DQ H2:SUS-FMY_M2_OSEMINF_LL_IN1_DQ H2:SUS-FMY_M2_OSEMINF_UR_IN1_DQ H2:SUS-FMY_M2_OSEMINF_LR_IN1_DQ
7395.21
25831.7
17090.4
22564.3
controls@cdsws2:~ 0$


To calculate the offest for each channel, one divides the above result by 2 and flips the sign.
To calculate the gain for each channel, one normalizes the above result to 30000 cts, i.e. (30000 / result) = gain.
I installed them by hand.

Hence the offsets are

controls@cdsws2:~ 134$ tdsread H2:SUS-FMY_M1_OSEMINF_F1_OFFSET H2:SUS-FMY_M1_OSEMINF_F2_OFFSET H2:SUS-FMY_M1_OSEMINF_F3_OFFSET H2:SUS-FMY_M1_OSEMINF_LF_OFFSET H2:SUS-FMY_M1_OSEMINF_RT_OFFSET H2:SUS-FMY_M1_OSEMINF_SD_OFFSET
-14165
-13634
-15271
-13571
-14115
-10542
controls@cdsws2:~ 134$ tdsread H2:SUS-FMY_M2_OSEMINF_UL_OFFSET H2:SUS-FMY_M2_OSEMINF_LL_OFFSET H2:SUS-FMY_M2_OSEMINF_UR_OFFSET H2:SUS-FMY_M2_OSEMINF_LR_OFFSET
-3697
-12915
-8545
-11282


and the gains are

controls@cdsws2:~ 134$ tdsread H2:SUS-FMY_M1_OSEMINF_F1_GAIN H2:SUS-FMY_M1_OSEMINF_F2_GAIN H2:SUS-FMY_M1_OSEMINF_F3_GAIN H2:SUS-FMY_M1_OSEMINF_LF_GAIN H2:SUS-FMY_M1_OSEMINF_RT_GAIN H2:SUS-FMY_M1_OSEMINF_SD_GAIN
1.059
1.1
0.982
1.105
1.063
1.422
controls@cdsws2:~ 134$ tdsread H2:SUS-FMY_M2_OSEMINF_UL_GAIN H2:SUS-FMY_M2_OSEMINF_LL_GAIN H2:SUS-FMY_M2_OSEMINF_UR_GAIN H2:SUS-FMY_M2_OSEMINF_LR_GAIN
4.056
1.161
1.755
1.329

Gas bottle delivery
HR workshops

Activities listed on the white board:
LVEA:
PSL diode / chiller room
SUS / SEI test
squeezer / H1 restore
triage clean storage
welding setup
ICC @ HAM 7,8
HEPI Welding HAM 9

EX:
BSC 5 set, pier set

MY:
oplev test

EY:
ICC @ BSC 6
RGA @ BSC 10
Transmon assy
HEPI Station Run

Plots of > .5 micron dust counts attached. I still need to investigate the dust monitor at location 1 in the LVEA (ISCT 4). The dust monitor at location 7 in the LVEA (near the previous location of the H2 PSL racks) dropped out for a while for an unknown reason. Michael R. replaced the fuse, but this did not appear to fix the problem.

Today the ETMY Quad-3 was moved to Y End Station. No problems were encountered during the move.   

This afternoon the TMS upper suspension was transported to the Y End Station. It has been mated to the Bosch tubing test stand for final assembly and alignment.