The cavity is locked and operating normally as of 3:00 UTC (20:00 local). The ISCTEY HEPA fan is off.
The addition of a Faraday in the green laser path has reduced the operating power by about 20%, so REFL_PWR_MON_OUT between 5000 and 8000 indicates that the cavity is locked and reasonably aligned.
I tripped the EY HEPI the cavity locking process. I am not aware of a reset to 'working' scipt.
EY ISI and SUS where tripped as well. On both I resetted the watchdog and the daqkill .. all is well.
Example of "broken":
controls@opsws4:~ 7$ tdswrite -sw H2:HPI-ETMY_ISO_HP INPUT OFF
ERROR: can't read from H2:HPI-ETMY_ISO_HP_SW1R
controls@opsws4:~ 0$ ezcaswitch H2:HPI-ETMY_ISO_HP INPUT OFF
readback H2:HPI-ETMY_ISO_HP_SW1 not accessible
This make scripting difficult.
The cavity is locked and operating normally as of 4:15 UTC (21:15 local). The ISCTEY HEPA fan is off.
Attached are plots of dust counts > .5 microns in particles per cubic foot.
Robert and Maggie hooked up new ACC, MIC and MAG signals in both the LVEA and EY. At EY new signals were attached both to the h2pemey front end and the h2pemeyaux (Newtonian Noise) front end.
I build new models for h2peml0, h2pemey and h2pemeyaux and restarted them on the front ends h2tcsl0, h2pemey, h2pemeyaux respectively.
I then restarted the H2 DAQ to get the new channels into the frame.
More detail will follow, but we determined how to get the length to pitch decoupling filter (jsut a confirmation), and using the Quad models we generated the length-to-pitch decoupling filter, for placement in the 'DriveAlign Matrix' in the M0 path.
The frequency dependent response is -Length-to-Pitch / Pitch-to-Pitch (with a gain factor).
Using plotallquad_dtttfs.m and quad_l2p.m in /ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/MatlabTools, I generated Dl2p_2012_07_13.mat. Is has a frequency vector and the coupling vector.
I modified the script to include the M0 Long-2-Pitch and the Pitch-2-Pitch transfer functions as well.
Activities for the day:
- Kyle vacuum work at HAM03, 8:44 - 8:58 am.
- Robert and Maggie, then Filiberto joined, PEM work, YBM area. 8:55 - 9:52 am.
- Jim W. and Mitchell R. work at HAM02, 9:21 - 10:56 am.
- Eric A. in and out of the LVEA, to check are around HAM02 and HAM03, 9:29 - 9:31 am.
- Douglas D. in to LVEA to put tools away, in and out, 9:37 - 9:40 am.
- Sno Valley to service HVAC @ X-End, 10:00 am
- Michael R, work at PSL, 10:04 - 10:18 am.
- Ski, work at mechanical room, 10:00 - 10:23 am.
- Justin B. visit the LVEA and to read a gauge,
- Maggie, et.al. to visit Y-End station EE racks, PEM work.
- Spotted forklift, green one, driving away from OSB towards LSB, 11:38 am.
- Kyle, LVEA work at HAM06, read a gauge, 1:23 - 1:28 pm.
- Michael R. and Rick S. visit PSL racks, 11:00 - 2:00 pm.
- Mitchell R. work at HAM03, 1:51 - 3:10 pm.
- Dominick, Y-End cable work at EE racks, 2:00 pm
- Received one momentarily dust alarm.
Rick S, Michael R
The 1k resistors R80, R85 in the FAST path and R71, R76 in the COMMON path were swapped out with 2k resistors to access a full range of gain. The gain in the medm filters for these paths was adjusted from 2048 to 1024 to compensate.
After the box was reinstalled on the table with the original medm slider gain settings (23dB for common, 8dB for fast) we found the UGF had changed and couldn't quite be recovered by using the gain slider. We found that the transmitted PD was low, only reading about 1V, and has been trending down the past few months from 5V. A quick alignment touch up of the periscope mirrors (in vertical) upstream of the ref cav increased the voltage to 2.8, but more work on the FSS path is needed to recover the lost light. We settled at 25dB for common gain.
The RFPD DC signal is dead so we can't compare the reflected to transmitted.
(corey, mitch) [this work was for Thursday 7/12]
While there was a lot of HEPI hustle and bustle at HAM3, Mitch and I took the opportunity to do cabling work on HAM2. For SEI, most of the cabling has been run, but I cleaned it up a little bit (especially the insanely inaccessible Corner3 path). I also installed our grounding/mounting brackets for our GS13s. For Corner3 work, I actually went in-chamber, climbed on table and hung out in the beam tube for this work---it wasn't that bad as far as access.
Mitch had cabling for SUS & ISC, so we went ahead and started running these cables (per a drawing which escapes me). We started on the west side, and I did a couple of cables on the north side, while I was in the chamber. We finished off getting ready to do the east side, but ran out of time. I'd say we completed about 75% of the SUS/ISC cabling.
Now while handling some of these cables, I noticed that one of the (4) screws on the face of the connector fell out. I checked the other screws and they were all a bit loose (a half/full turn), so I went ahead and tightened all of them.
Cleanliness note: Will these chambers get vacuumed again? While in chamber I noticed particles in the bellows (a piece of glove, and a fairly big (1-2mm) plastic piece).
On the afternoon of 7/10, Betsy glued magnets onto MC2 and Gerardo glued a prism onto a PUM. The photo collection sits in ResourceSpace.
Today, Travis, Andres, and Jeff hoisted the PR2 SUS out of the storage container and placed it onto the chamber side table. We'll work towards getting it connected to electronics and resuspend the all metal masses likely next week.
Today, I packed up and transported the fully outfitted IMCC optic to the HAM chamberside install area. It took all 4 of us (Jeff, Travis, Andres, and I) to get it into the suspension and suspended as a single stage. At first glance however, it seems to have only minor pitch error which is a relief. We finished resecuring the optic with EQ stops and face covers and left it under its C3 tent for the night. We'll still need to finish suspending and tweeking alignment before taking TFs.
In order to assess the effect of recent temperature changes on our testing, I installed 2 Lascar Temperature/Humidity data-loggers in the staging building:
#1 Is inside a cleanroom. I set it on the West SEI test stand (currently used for the testing of HAM-ISI Unit #6). Pic.1
#2 Is outside the cleanrooms, against the south wall, behind the East SEI test stand (currently used for the assebly of HAM-ISI Unit #7). Pic.2,3
Setup for the Data-Loggers:
Note: Loggers' data is collected with a Windows-only software. This software is available on the solidworks station.
Thanks to SUS for letting us borrow the loggers from them.
The noise above 200Hz is probably frequency noise from the fiber link which carries the stabilized beam from the corner station (see T0900376). The broadband floor to the frequency noise is about 1Hz/rtHz, with acoustic peaks from ~50Hz up that reach ~30Hz/rtHz. This will translate to a flor around 15pm/rtHz in the arm cavity spectrum (see entry 3413, and the ALS wiki page).
Thomas Vo Scott(Apollo) Matt Evans By offsetting the pitch and yaw test filters on the M0 stage we can see the optical lever beam move in pitch and yaw respectively. For a sanity check, I also independently put an offset on the reaction mass test filters and this did not affect the optical lever beams so I'm sure that we are not seeing another ghost beam off the reaction mass. BUT!!! One thing I noticed is that there is another beam close to our currently aligned beam, approximately 3 cm away. After looking up some specs for the test mass depth (~34cm) and the gap between the reaction mass (~5mm), Matt and I did some calculations and it looks like the beam that we are currently aligning to is the reflection off the back surface which will give you the same transfer function results as a front surface reflection. Looking at the reflectivity/transmission data for the ETMy shows that the primary reflection off the front surface is comparable to the secondary reflection off the back surface so it is difficult to judge by eye which one is which. These calculations will be needed in future installs for correct alignment. For optical levers with large lever arms such as ITMy (optical path ~ 60 meters), the wedge will play a significant role in determining the correct beam as well. The solution is to go back and open up the enclosures to do yet another re-alignment to look for the correct beam off the front, that would require a soft close of the gate valve. The reflection off the back surface will still be able to give pitch and yaw, unless the other beam encroaches on the photodetector.
Attached are plots of dust counts > .5 microns in particles per cubic foot. I have included a plot of the mode of the dust monitor at location 15 in the LVEA (H0:PEM-LVEA_DST15_MODE) to show when the communication to it was lost.
Attached is the accumulated data of the LN2 purge on the HAM6 shipping container. At this point bumping the flow rate up to ~20 L/m has encouraged the dew point to continue to drop. After the dewar ran empty yesterday it has since been refilled, hooked back up, and data logging continues.
The ring heater was turned on today to check whether running the ring heater had an effect on the vacuum pressure. 15W of power was put through each segment of the ring heater at 19:07:30 UTC until 19:37:08 UTC (by adding an offset of 25,000 counts to H2TCSETMY _EMTY_RING_HTR_SEG1_DC_I_SET and H2TCSETMY_ETMY_RING_HTR_SEG2_DC_I_SET), which is close to the maximum ouput of the ring heater. The vacuum in BSC6 was not affected by running the ring heater, which is good.
I added in gains to the ring heater input and readout channels so that the we can input the current in amps and readout the voltage and ring current on volts and amps instead of counts (reffering to D1002529 for the required conversion factors).
Just a note, the temperature sensors are in fact broken on these ring heater segments, the attached image shows the signals railed for the sensors.
The cavity alignment degraded as the force applied to M0 on the ETM increased to the maximum value (200k in L, or 100k on each BOSEM). It was locked and well aligned for the first hour, and stayed locked for 10 hours (until 13:00 UTC) before the ETM hit the limits.