The following work was installed/powered last Friday:

End Y H2 Electronics Rack (Receiving area entering EY)
1. 2 Magnetometers and 2 filter units
2. 1 Microphone
3. 1 Accelerometer and 1 Endevco Unit
Two Kepco Power supplies were installed in the DCC Power Rack to power PEM units.

LVEA ITMY Racks (Between BSC8 and Y arm manifold):
1. 3 Magnetometers 
2. 3 Microphones
3. Accelerometers and 1 Endevco Unit

The ETM optical lever shows interference fringes when the TM is subject to a large longitudinal drive.  I guess this will go away when the front surface beam is found, but it is something to look for on all the optical levers to be sure that we don't add noise from longitudinal motion.

Due to an apparent increase in noise when the cavity was well aligned, we (Bram and Matt) suspected that some of the 532nm light retro-reflected from the cavity was getting into the laser and causing problems.  To test this, we added a second faraday after the laser on the ALS table (ISCTEY) and realigned the beam.  This appears to have had the desired effect (see plots), but in the process we discovered that some work will be needed to understand the REFL RF photodector, as it seems to be overfilled and its alignment may change our noise floor.

We also found clear fringes in the cavity error signal (PDH_IMON) even with the ITM misaligned.  The fringe velocity is senstive to motion of the ASL table, and to the state of the HEPA fan on the table.  These fringes are only a few mV, but they may be a noise source and will need to be investigated further.

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.

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.

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:

• Names:
  #1: InCLeanRoom
  #2: OutsideCleanRoom
• delayed start: 12:00:00 PM on 07/12/2012
• Logger continues to log, overwrting the oldest data when full.
• No humidity alarm
• No temperature alarm
• LCD ON for 30s after button press.

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).

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).

• To channels H2TCSETMY _EMTY_RING_HTR_SEG1_DC_I_SET and H2TCSETMY _EMTY_RING_HTR_SEG2_DC_I_SET I added a gain of 3.9961e4 amps/count so that you can input the curent in amps and the output of the channel is in counts (using conversion factors 0.082A/V and 20^16/20 count/V)
• To channels H2TCSETMY _EMTY_RING_HTR_SEG1_I_MON and H2TCSETMY _EMTY_RING_HTR_SEG2_I_MON I added a gain of 4.982e-5 counts/amp so that the output of the channel is in amps (conversion factors are 40/2^16 V/count and 1/12.25 A/V)
• To channels H2TCSETMY _EMTY_RING_HTR_SEG1_V_MON, H2TCSETMY _EMTY_RING_HTR_SEG1_LV_MON, H2TCSETMY _EMTY_RING_HTR_SEG2_V_MON, H2TCSETMY _EMTY_RING_HTR_SEG2_LV_MON I added a gain of 0.0024 counts/volt so that the output is in volts (conversion factors are 40/2^16 V/count, 1/0.25 V/V).