Will finish tomorrow
Currently RM1 and RM2 are still in acquire mode. Attached is a coil output signal plot in cts, with a calibration that mimics the the anti-dewhitening filter is applied. The RMS will still be <200cts, and that's with the purge air running. This will require putting jumpers in the RM1 and RM2 coil drivers (4 each). At the same time the OM1,OM2 and OM3 coild drivers can also be jumper-ed for RUN mode and to permanently enable them (2x4 jumpers per coil driver).
930 SnoValley to EX 930 Sheila transistioning LVEA to laser safe 1000 Thomas working on ACB and MCB in LVEA 1038 Apollo begins removing extra piping along X-manifold (WP 4171) 1100 Jeff K restarting H1ASC 1250 Filiberto and Aaron to EX to work on cabling 1300 Cheryl to EX to make everything peachy in the TMS lab 1440 Rich and Alexa to EX to inspect cabling 1515 T-Vo and P-Tho restarting IO/PSL environmental chassis
on Friday Kiwamu and stefan moved the tip tilts according to the calculation. Yesterday Stefan and I both remeasured these positions, what we got is that the distance from RM1 to RM2 is sqrt((17*2)^2+1^2)=34 inches. The distance from RM2 to M5 is sqrt((18*2)^2+6.5^2)=36.6 inches. We moved the BS for the refl LSC detector to 31 inches from M5.
When we first started making beam measurements we got some not repeatable results, because the beam was moving alot. With no one in the chamber or on the platform and the tip tilts damped we got repeatable results. With the mode master placed 22 inches from the beam splitter in this position we measured the beam using mode master ( we got a maximum gamma error). The result is in the attached photo P1000690.png. We also made measurements with the mode master 31 and 3/4 inches from the BS, this measurement is also attached as P1000689.png
This afternoon we also used the nanoscan to measure the beam waist (with the BS in the same position). These are saved on the Nanoscan computer and I will add them to this post in the morning.
I have also attached some plots to help compare our measurements to each other and to Paul's calculated beam (and the script). Summary_Hor and Summary_Vert show Paul's calculation, our measurement before the TTs, and our two measurements after the TTs after we moved them to their current locations, with all of these beams propagated through the refl WFS path in HAM1. The magenta and green curves are the two mode master measurements made about a foot apart after the tip tilts, the green line is almost not visible because these two measurements agreed with each other. The plot shows each of these four beams propagated back to before any of the tip tilts, and compared to the nanoscan measurement we made before the tip tilts (the first tip tilt has been deleted to allow the comparison). The last plot shows all four of these beams compared to the nano scan measurements we made after the tip tilts (with L101 deleted). The nanoscan results are intermediate between Paul's calculation and our mode master measurement before the tip tilts.
The gouy phase separations based on each of these beams is:
TT seperation hor | TT seperation vert | WFS seperation hor | WFS seperation vert | |
Pauls calc | 85 | 84 | 89 | 90 |
MM before TTs | 87 | 79 | 75 | 77 |
MM after TTs1 | 57 | 43 | 88 | 81 |
MM after TT2 | 57 | 42 | 88 | 81 |
So, although the agreement between our measurements (and calculation) aren't great, at least it seems clear that the gouy phase separations were improved by moving the tip tilts.
Following the SEI group sign-off on the BSC3 Cartridge, I started cleaning up the ISI today. So far, electronics are powered down, all cabling is disconnected (in-air and in-vac), CPS racks removed, ISI locked, test stand nuts removed, all the hidey-holes in St0 checked for loose tools and all in-vac cabling is stowed. There are still some loose parts on the ISI to be removed (keel mass and other masses that were used in testing), lift pads need added and the ISI needs covers. The cleanrooms also need to be re-arranged, non-cartridge clean items need to be stowed in the neighboring clean-room, and a path needs to be cleared to allow the cartridge cleanroom to be moved out of the way prior to flight. Shouldn't take more than a couple of hours to finish prep, though.
Jim and I cabled up the Beckhoff serial lines at EX last Friday. This afternoon Daniel completed the Beckhoff configuration to read out the timing diagnostics from the EX Timing Fanout Unit into EPICS. The diagnostics are available on an MEDM screen, from the SYS part of the site overview (see attached). I need to add these diag channels to the DAQ tomorrow.
I have attached pictures of HAM1 with everything installed.
Alexa, Rich After dressing in all the in-vacuum cabling in HAM1, we took final RF transfer functions of all detectors at their respective operating frequencies. These transfer functions are taken from the ISC-R2 rack (patch panel connector for LSC detectors, and terminated cable ends for ASC Detectors. The cable (type LMR-195) has an RF loss of ~2.5dB per 100 feet and a velocity factor of 0.76. The cable length from rack (as measured by time domain reflectometer (TDR) is 43 feet to flange, 57 feet to detector). The in-vacuum cable is a flexible RG316 equivalent made by Gore Inc. The velocity factor is approximately 0.7 for this cable. The measured loss of this cable (done at CIT) on a 10.5 foot section is: 0.28dB at 9MHz 0.50dB at 36MHz 0.56dB at 50MHz 0.84dB at 100MHz All transfer functions taken from test input to RF outputs. Don't forget to enable the RF test switches for the LSC detectors, then disable them once you are done measuring to avoid an unnecessary noise introduction path into the LSC detection chain. LSC POP-9MHz 17.0dB LSC POP-45MHz 17.1dB LSC REFL-9MHz 17.7dB LSC REFL-45MHz 17.4dB ASC REFL A-9MHz Quadrant1 5.7dB ASC REFL A-9MHz Quadrant2 5.9dB ASC REFL A-9MHz Quadrant3 7.5dB ASC REFL A-9MHz Quadrant4 6.9dB ASC REFL A-45MHz Quadrant1 5.5dB ASC REFL A-45MHz Quadrant2 5.8dB ASC REFL A-45MHz Quadrant3 5.6dB ASC REFL A-45MHz Quadrant4 5.4dB ASC REFL B-9MHz Quadrant1 4.0dB ASC REFL B-9MHz Quadrant2 5.5dB ASC REFL B-9MHz Quadrant3 4.1dB ASC REFL B-9MHz Quadrant4 4.4dB ASC REFL B-45MHz Quadrant1 5.4dB ASC REFL B-45MHz Quadrant2 5.5dB ASC REFL B-45MHz Quadrant3 5.9dB ASC REFL B-45MHz Quadrant4 5.6dB
I used thenano scan to measure a beam profile on IOT2L. near the periscope, the vertical waist diameter is 4411um. The horizontal beam isnot gaussian, the waist diameter fit is 4007um. (screen shot is first image attached to this report) This was taken 3 and 1/2" from the bottom periscope mirror, the periscope height is 23 and 1/2 ", and the top periscope mirror is approx 2'8 and1/2" from the viewport. This data is saved as IOT2L1 on the nanoscan computer.
I moved the scan head back to 14" behind the botttom periscope mirror, and measured 4405 um diameter vertical , the horizontal beam still is non gaussian, but the diameter is 4070 um. (screen shot is second image attached)
This data is now transfered to http://www.ligo-wa.caltech.edu/~sheila.dwyer/NanoScanData/IO/
J. Kissel, S. Ballmer, C. Wipf After discussions with both Chris and Stefan, I have re-arranged how the IMC WFS' master switch, gain, and trigger bit are combined such that the implementation is a little less obfuscated and well-annotated in the Simulink model. I attach a new screenshot. In this new arrangement, each of the three variables -- all nominally 0 (zero) or 1 (one) for OFF and ON, respectively -- are simply multiplied together by one block, as opposed to feeding the trigger into a switch block that compares its value against the master switch (nominally 1 [one]) and a ground (equivalent 0 [zero]) [See identically named screenshot in LHO aLOG 7984 for previous implementation]. For historical purposes: Stefan had originally implemented the triggering with the comparator switch for philosophical reasons in that (at least with conventional c-code) it is bad practice to assume a trigger could only be 0 or 1 -- typically when programming in c, a flag is either zero or non-zero, where non-zero can be anything and should never be assumed to be one. However, the trigger library part used (from ${userapps}/release/isc/common/models/LSC_TRIGGER.mdl) is written to ONLY spit out a 0 or 1. Therefore this bad-practice failure-mode dos not apply, and we are free to make the output bit generation more clear. As of this entry, the ${userapps}/release/asc/h1/models/h1ascimc.mdl has been re-compiled, re-installed, re-started, and re-stored. Since the mode cleaner is dead for the time being due to venting of the corner volume (light from the PSL has been shuttered), I cannot *confirm* all is still functional, but I'm 99% confident all is well.
Sheila, Alexa, Stefan, Rich Present Status: 1. Day started with one DC cable needing to be fixed. We did this and all the RFPDs are properly powered now. 2. After getting DC stuff going, found one bad connection in an RF cable due to the 5-way coaxial connector not being properly seated. 3. When we undid the 5 way coaxial connector, the 4-40 helicoil came out of the RFPD. Now things went downhill. We spent many hours going through bag after bag in the LVEA, Staging building, and X-end station looking for a 4-40 helicoil insertion tool and a single class A clean 4-40 helicoil. Never found any. Took one from a perfectly good cable which must now be fixed later. 4. As of now, 100% of the electrical components in HAM1 are functional. 5. Bolted down and optically aligned REFL A&B, and REFL LSC detector. Didn't have a beam to align LSC POP detector, so it's bolted down, but not final aligned with light Next Actions: 1. Complete and log the RF transfer functions to establish reference levels for each signal at the respective operating frequency (test input to each RF output) 2. Clean up the cable routing in HAM1 3. Final table balancing 4. Log all data taken during checkout 5. ASC screen checkout
Joe, Pablo, Cheryl, Sheila
We measured the beams coming out of the HAM2 viewport, with the nanoscan head 2 feet 6 inches from the viewport. (in the first version of this alog I wrote the wrong distance)
For the brighter beam we measured beam diameters: 2549 um horizontal, 2632 um vertical. after rorating the scan head 90 degrees we measured 2650um vertical, 2561 um horizontal.
For the dim beam we measured 7160um vertical, 5972 um horizontal after rotating by 90 degrees we got 6077um horizontal 5865um vertical.
We also measured the beam in HAM1, in the same location as wensday (we move the BS for the RF PD to 16 inches after M2, we put the nanoscan 40 inches after the BS, there we got 4025 um vertical, 4126 horizontal. After rotating the head 90 degrees we got 4045 um vertical 4020um horizontal.
Hi Sheila, Can you be a little more specific which beam you measure where? The 4000um diameters sound good but I don't know what you mean with the brighter beam and what with the dimer beam.
Hi Guido-
I believe the brighter beam is the reflection off of PRM, although I haven't looked at the layout to double check. As you face the viewport, near the veiwport the dim beam is on the right while the bright beam is on the left. If you move to about 3 feet away from the viewport they cross, and the dim one is on the left if you are facing the veiwport. Pablo watched the spots on the wall as I moved the PRM alignment, and the bright one moved.
I should have been more clear, the first two measurements are of beam sizes for SM2 trans, coming out of the HAM2 veiwport where IOT2R would normally be.
Looking at the table layout for HAM2 (D0901083), I would expect the SM1 forward trans beam (from PMMT2 a.k.a. IM3) to be the dimmer beam, since this beam is split twice before making its way to the viewport. The SM1 return trans beam is not split at all before getting to the viewport. (I think you already came to this conclusion).
From the model, using rather rough estimates for the distances after IM4 transmission (+/- 2 inches), we expect that the SM1 forward trans beam (dimmer beam) where you measured it should have diameters of 6.20mm horizontal and vertical. The SM1 return trans beam (brighter beam) where you measured it should have diameters of 2.68mm horizonal and 2.67mm vertical. Not so far away from what you measured...
I'll try to get more precise numbers for the after-IM4-trans distance from Luke and update accordingly.
Apologies, everywhere I wrote "SM1" I meant "SM2". Or IM4, they are the same mirror.
SM2TransReturn1.png is a screen shot of the nanoscan program with the bright beam, when apperature 1 veritcal.
SM2TransForward1.png the dimmer beam, first with Apperature 1 horizontal then SM2TransForward2.png is with the apperature 1 vertical.
I haven't figured out how to export data from the software, and I can't uplaod .nsd files to the alog, but if anyone wants the data it is available at http://www.ligo-wa.caltech.edu/~sheila.dwyer/NanoScanData/IO/
You can use the free Nanosan software from Ophir/ Newport to open these files.
We saw that the Forward beam looks like it could possibly be clipping, Joe tried to move the location of the nanoscan head but the beam profile didn't get any better.
Just an update on the expected beam sizes with more accurate distances used in the model (good to 1/4" or so, inlcuding IM4 substrate and viewport substrate effect):
SM2trans forward 2wx=6.349mm, 2wy=6.3455mm
SM2trans return 2wx=2.6813mm, 2wy=2.6697mm
We placed Mode Master downstream of three-mirror Gouy phase matching telescope comprising two tip-tilts and one fixed mirror that is used for REFL WFS. (See the last picture for layout and distances.)
Note that the measured TT1-TT2 distance is about 1cm shorter than nominal described in Sam Waldman's document (http://dcc.ligo.org/T1000247), TT2-M5 distance is about 14mm longer than nominal, both of which should have been quite acceptable.
Anyway, we made this measurement and the beam was much smaller than what was expected. The first plot as well as the table below show the measured VS the expected mode profile coming out of HAM1 propagated through the telescope with the measured mirror distances.
measured, x | measured, y | expected | |
M^2 | 1.04 | 0.98 | 1-ish |
Waist radius | 1.38 mm | 1.15 mm | 1.92mm |
Waist position (away from MM head into HAM1) | 4.31 m | 4.35 m | 1.78 m |
Mode overlap between measured and expected | 0.872 | 0.753 | 1 |
The total mode overlap between the actual beam and what is expected is somewhere between 0.75 and 0.87 (sort of tedious to do the real calculation so I leave it).
The 2nd plot shows that IF the incoming beam from HAM1 is as expected, in order to explain the measured mode the TT1-TT2 distance labeled as delta1 should be shorter by 4.5cm than was measured for X, or by 5.7cm for Y. This is a huge number, there's no way my distance measurement was that much off.
The 3rd plot shows the Gouy shift between TTs (i.e. actuation orthogonality) and WFSs for the WFS sled (i.e. sensing), and it seems like both are quite poor for the measured mode, 26deg for actuation and 35 for sensing are sad though not a complete disaster.
Anyway, since it's hard to imagine that the ROC of TT1 (+1.7m), TT2 (-0.6m) and M5 (+1.7m) are grossly wrong, and since it's hard to imagine that the distance measurement has a 5 to 6cm error, this should mean either (or some) of the followings:
The third one doesn't sound likely, but neither Sam nor I have thought about this.
One quick thing to do is to measure the beam before it gets to the telescope by inserting M6 upstream of the TT1 to direct the beam to the Mode Master.
Yes, please, measure the beam before the TTs. The original calculations were done by assuming that beam reaching HAM1 was perfectly matched to PRM. I don't think we have reasons to believe that's true.. The "nominal" q of the beam right before the first tip-tilt RM1 is: % REFL in-vacuum path beam propagation, HAM1 drawing v10 % https://dcc.ligo.org/LIGO-D1000313-v10 % LisaBar, August 14, 2013 q_in = 1.03+13.1i; % Beam on HAM1 calculated from CalculatePRM.m % Lisa: we don't have a measurement yet which confirms % this number!
I don't think the table in T1000247 is correct. The beam from PMMT2 goes through the Faraday, hits PMMT1 and is then send to HAM1. This is a) longer than 2.5m and b) adds PMMT1's curvature to it. Did you include this?
Yes, PMMT1 is included, it is just a typo in the note (there are two PMMT2!). Anyway, let's redo the calculations with the as-built parameters, and cross check with the measurements before the REFL telescope.
Kiwamu and Pablo and I measured the mode before the TTs by moving the BS for the RF detector to 16 inches after M2, with the front of the mode master 40 inches from the BS we measured:
x | y | r | |
M^2 | 0.97 | 1.03 | 1.00 |
2Wo (mm) | 3.588 | 3.532 | 3.567 |
Z0 (m) | -2.387 | -3.578 | -3.026 |
The overlap between the mode measured before the Tip tilts and the mode measured after is 93% for X, 87% for Y. I used Lisa's alm mode model attached to D1000313, added Keita's measurements of the distances from RM1 to RM2 and M5, but didn't include the tilt of the optics. From this measurement before the tip tilts (projected through Keita's measurements of distances), the gouy phase separation is a little better than from Keita's measurement, WFS X=65 degrees, WFSY 60 degrees, TT x=56 TT y 50 degrees.
I checked to see how far wrong things in HAM2 would have to be in order to explain the beam waist sizes measured by Sheila before the tip-tilts.
I used the design parameters for IM2 and IM3 Rcs (except where varied), design parameters for HAM2 optics placement as found in E1200616 (except where varied), the measured value of PRM HR Rc of -10.9478m, and the design IMC parameters to get the starting beam parameter. The attached plots show the forward beam waist size (identical to the IMC waist size) and the return from PRM beam waist size, over variations in IM2 and IM3 Rc, and IM2->IM3 and IM4->PRM distance. At the design values (at the x-axis midpoint), the return x-waist size matches the forward waist size.
It looks like things in HAM2 would have to be further off from the design than is probably likely, in order to explain the measured beam waist size before the tip-tilts.
Propagating the IMC transmission beam through the "as-built" IMs, back from the PRM, off the FI rejected beam pick off mirror and onto HAM1 to the location where Sheila measured gives:
axis | parameter | value |
x | w0 | 2.123mm |
y | w0 | 2.101mm |
x | z | -2.469m |
y | z | -2.150m |
x | q | -2.469+13.310i |
y | q | -2.150+13.035i |
x | w | 2.159mm |
y | w | 2.129mm |
x | Rc | -74.21m |
y | Rc | -81.16m |
I did not yet consider the calcite wedge polarizer effect on the beam parameter, and I didn't account for the thickness of the septum viewport.
The overlap of these beam parameters with Sheila's measured parameters are:
x overlap = 0.945
y overlap = 0.934
I'm including the Finesse kat file I used for the calculation, which has a list of all the parameters I used at the top. I also include that list here for convenience:
# H1_IMCtoPRC_matching.kat
# A file for checking the expected beam parameter in direct reflection from the PRM
# as a function of HAM2 optic RCs and placement positions
#
# Mirror curvature parameters taken from the nebula page, except IM2 and IM3 for
# which the design values were taken
#
# Distances taken from E1200616_v7 except where otherwise noted
#
# IMCC Curvature = 27275mm
# MC1->MC2 = 16240.6mm
# MC2->MC3 = 16240.6mm
# MC3->MC1 = 465mmm
# MC3 substrate path length = 84.5mm
# MC3-AR surface to IM1 = 428.2mm
# IM1->IM2 = 1293.8mm
# IM2 Rc = 12800mm
# IM2 AOI = 7deg
# IM2->IM3 = 1170.4mm
# IM3 Rc = -6240mm
# IM3 AOI = 7.1deg
# IM3->IM4 = 1174.5mm
# IM4->PRM-AR surface = 413.5mm
# PRM substrate path length = 73.7mm
# PRM Rc = 10947.8mm (from Rodica's measurement value)
# IM2->FIrejected pick off mirror = 1.012m (From Luke Williams)
# FI rejected pick off mirror->HAM1 mode master location =3.0175m (Estimated from
# Sheila's alog entry, HAM2 drawing, and 27.6" for HAM1 table edge to HAM2 table edge)
#####################################################################################
If anything, my measurement is a bit more suspicious than Sheila's, as mine is downstream of TTs in air and they are moving (mostly in PIT).
axis | parameter | value |
x | w0 | 2.121mm |
y | w0 | 2.101mm |
x | z | -2.583m |
y | z | -2.154m |
x | q | -2.583 + 13.29i |
y | q | -2.154 + 13.04i |
x | w | 2.161mm |
y | w | 2.130mm |
x | Rc | -70.95m |
y | Rc | -81.05 |
Apparently I posted the last comment as Giacomo, sorry about that!
After discussing with Lisa about sign conventions for the beam waist position parameter, I realised that there are errors in some of the parameters I posted above. The mode master gives results as "z0" for waist position relative to the measurement position (z0-z), whereas Finesse gives results as "z" for the measurement position relative to the waist position (z-z0).
I had thought the convention was different, so I flipped my results to match the mode master convention. This was a mistake, because the conventions are the same, they just give different outputs. To get the q-parameter from the mode master results one should use the formula q = -z0 + i*zR. From the Finesse results one should use the formula q = z + i*zR.
This means that the z-values, Rc values and the real part of the q-parameters I posted should all have their signs flipped. Apologies for any confusion I caused here.
Patrick T., Thomas V. Last night Thomas and I swapped the temporary cables being used to test the rotation stage in the CSR with the ones made for the final installation. These are not pulled yet, but are coiled in front of the rack holding the Beckhoff PSL environmental chassis and attached to a rotation stage sitting on a rolling table nearby. For some reason two cables had been unplugged from the controller box (goes between rotation stage and Beckhoff module). One was power and the other was a control cable. I'm not sure why they were unplugged, but we reattached them. I was hoping this would address problems we were having getting the rotation stage to move, but they have persisted.
Patrick T., Thomas V., Vern S. It would appear after testing that the rotation stage itself is burned out.
The "failure" of the Newport URS50BCC rotation stage was of concern to me as we have three of them in each IFO controlling significant amounts of laser power. These were new units and we had been reasonably careful with them. Why should this one die all of a sudden? This is what I found on investigating our broken rotation stage, S/N B12 6940 (Newport's serial number, not the ICS or DCC number).
The rotation stage's angular encoder was working. The TwinCAT2 control software for the rotation stage was showing angle and the "Mechanicsl Zero" signal was present (a high to low transition on moving from 350 deg to 5 deg). This indicated that the electonics was working and not blown. However, the resistance across the motor terminals (at the DB15 connector, pins 2 and 10) was infinite. Opening the housing that held the DB15 connector and printed circuit while monitoring the motor resistance, I found that it would intermitantly read 57.4 ohms, the proper motor resistance. The problem was traced to a bad connection of the upper ribbon cable which went from the printed circuit board to the motor and shaft angle encoder. The connection was a leaded connector designed for through-hole mounting and soldered onto surface-mounting pads. This is not a method of assembly I would recommend. I patched it back together and confirmed that the stage works. I'll use this for debugging and testing and assign it to our spares.
This is a list of the ISC diagnostic optics in HAM1. Some of these are yet to be installed, but all will be installed in this installation window.
The only differences between this and D1000313 are:
ID | Type and DCC | S/N or marking | Mount | Path etc. | comments |
M1 | 50% IR, E1000671-02 | ? | RH | REFL air-vac splitter | put in previously |
M2 | HR IR, E1100048 | 0990 | LH with dump | REFL vac steering | newly put in |
RM1 | Curved +1.7m HR IR, E1100056-01 | 2 | TT (S/N ???) | REFL vac MM TT1 | newly put in |
RM2 | Curved -0.6m HR IR, E1100056-03 | 24 | TT (S/N ???) | REFL vac MM TT2 | newly put in |
M5 | Curved +1.7m HR IR, E1100056-01 | 3 | RH with dump | REFL vac MM fixed | newly put in, different from D1000313 |
M6 | 50% IR, E040512-B1 (as opposed to E1000671-02) | IO824-01 on the barrel | LH with pico | REFL vac LS/AS splitter | newly put in, different from D1000313 |
M7 | HR IR, E1100048 | ? | LH | REFL air steering | put in previously |
M8 | HR IR/GRN, E1000425 | ? | Peri wth dump | POP/ALS peri | put in previously |
M9 | HR IR/GRN, E1000425 | ? | Peri with dump | POP/ALS peri | put in previously |
M10 | HR IR, HT GRN, E1000669 | ? | LH | POP/ALS dichroic | put in previously |
M11 | HR GRN, E1000652 | ? | LH with dump | ALS steering | put in previously |
M12 | 90% IR, E040512-B3 | IO820-09 on the barrel | LH | POP vac/air splitter | newly put in |
M13 | HR IR, E1100048 | ? | RH with dump | PSL reference | put in previously |
M14 | 90% S-pol IR, E040512-B4 | IO823-?? on the barrel | RH | REFL splitter for high power dump | newly put in, different from D1000313 |
M15 | HR IR, E1100048 | 0944 | RH pico with dump | POP vac steering for LSC | newly put in |
M16 | HR IR, E1100048 | 0965 | RH with dump | POP air steering | newly put in |
M101 | 1" HR IR, E1000595 | ? | 1" LH with dump | part of REFL WFS sled | newly put in |
M102 | 1" HR IR, E1000595 | ? | 1" LH with dump | part of REFL WFS sled | newly put in |
M103 | 1" 50% IR, E1000671-02 | ? | 1" LH pico | part of REFL WFS sled | newly put in |
M104 | 1" HR IR, E1000595 | ? | 1" LH pico with dump | part of REFL WFS sled | newly put in |
L101 | 1" f=+334mm, E1000845-03 | ? | 1" lens | part of REFL WFS sled | newly put in |
L102 | 1" f=-167mm, E1000845-08 | ? | 1" lens | part of REFL WFS sled | newly put in |
L1 | 1" f=+222mm, E1000845-02 | ? | 1" lens | for LSC REFL | newly put in |
L2 | f=+334mm, E1000845-10 | ? | 2" lens | for LSC POP | newly put in |
BDV1 | HR IR, old iLIGO | N/A (no marking) | BDV | for REFL air | newly put in |
BDV2 | 90% IR, E040512-B3 | IO820-05 on the barrel | BDV | for POP air | newly put in |
HW1 | 1" IR half wave plate from ALS stock | N/A (no marking) | rotator mount | for REFL | newly put in |
Note:
We rejected one optic (E040512-B3, IO822-07 on the barrel) because there were many (not too many) defects or particulates that we couldn't remove by nitrogen gun, gentle push using a wipe, nor a serious cleaning effort using methanol and a wipe.
It is still OK-ish, but it's not spotless either. I would have used that if nothing else is available. Anyway, that optic is now in "clean, with issues, or from SQZ" optics bin in the optics lab.
RM1 mount serial number: 024
RM2 mount serial number: 022