Quiet day:

- CP1 was refilled early this morning triggered Vacuum alarm

- Some parts of HAM3 were adjusted this morning, check H1:HPI-PUMP_LO_DIFF_PRESSURE or ask Greg

- Work in Y-End, ask Alexa and Sheila

- On Sitemap -> CDS -> Overview: Dave fix a DDC error rebooting the channel

- Work in X-End, ask Apollo crew, Mike, Lisa, Scoot, Mitch, and Travis

- Fred gave a tour inside the LVEA to 11 students

- There were more visitants but unfortunately no one could give them a tour

- The Pcal LLO Y-arm crate is ready to be shipped

pablo

Using advLigoRTS trunk r3409, built and installed symmetricom driver on h1dc0.  Then built and installed daqd for x1dc0, x1nds1, and x1fw1.  Note that daqd in the target directories for the systems is a symbolic link to daqd-r3409.  Restarted data concentrator.

Here are some instructions to ramp up the HEPI and the ISI

1- SUS must be damped (SUS watchdogs are connected to ISI)
2- ISI must be ONLY damped (using the "Command window")
3- Ramp up the feedforward using a gain of 1 in X, Y, Z. No feedforward in the other directions
4- HEPI can be controlled in position or with a IPS-L4C blend
    1- Position control uses the IPS only. In BLND block, FM2 filter must be engaged for position control
    2- There are 3 sets of Isolation filters in the ISO Block (Level 1 are the filters dedicated for the IPS-L4C blend, Level 2 are filters for position control with UGF at 100mHz, Level 3 are filters for position control with UGF at 5Hz). USE Level 2 or level 3 for now
5- Ramping up the ISI
    1- Super sensor of stage 1 must use L4Cs when ramping up (T240 might saturate due to DC position offsets) Press 750mHz
    2- Super sensor of stage 2 can be ramped with GS13 blended at 250mHz
    3- Go to command and press Isolate Level 3 (40Hz UGF on stage 1, 32Hz UGF on stage 2)
    4- Wait few seconds (till  the T240s input values are less than 2000counts)
    5- Lower the Blend frequency on stage 1 and introduce the T240s in the blend. Press T250mHz in all DOFs. Additional filters (T100mHz and T100mHz_0.44) can also be used to get some isolation at 0.44Hz (QUAD first pitch mode)
6- HEPI offloading. In ISC Mon. Turn on control in Y
7- Sensor correction (tricky during the day due to install activities)
    1- Ramp up the sensor correction on stage 1 (Turn on the output switch and ramp up the gain to 1 in the GND bank)
    2- Ramp up the sensor correction on stage 2 (Turn on the output switch and ramp up the gain to 1)

This applies for the three BSC-ISIs (except HEPI on BSC1 )

[Stefan, Kiwamu]

The demod phases for the IMC changed again and we readjusted them.

Then after a course of adjustments and etc, we came back to the point where we can update the CARM beatnote noise spectrum.

There is some improvements at around 10 Hz but the low frequency performance was not great today probably due to seismic noise, resulting in a worse RMS.

The spectrum  update:

The attached is the new spectrum which we took tonight. Note that ISS was off tonight.

Green : our best noise curve

Blue : new spectrum with a low control BW

Red : new spectrum with a high control BW

IMC demod phase rotated again :

The demod phases for the IMC locking and WFSs rotated again. It is still unclear what caused it.  This is the second time to see such a spontaneous phase rotation. The first one just happened yesterday and the second happened this evening. In this early evening we found that the IMC locking loop lost a factor of about 3 for some reason, resulting in a lower UGF.  At this point we were OK with the demod phase which was newly set yesterday. However after a number of investigation we found that the demod phase rotated by 90 degrees backward as if it came back to the original phase.

 Before we noticed it we were simply chasing the missing gain factor. We looked at the EOM modulation source path at which we found the loose connection yesterday. The output from the distribution amplifier looked OK --- the signal at 24 MHz had 3.4 Vpk-pk. Then I entered the PSL to check the power of the same RF signal but at the end of the RF chain right before the EOM. I disconnected the SMA connector at the side panel of the EOM can and plugged it to an scope. It seemed also fine --- the RF signal had 3.11 Vpk-pk which agrees with the previous measurement done by Volker a while ago. Note that during the measurement I closed the HPO external shutter to be safe. Also I had to disconnect the SMA connector of the 45 MHz  source since this was in the way of the 24 MHz connector on the side panel. All of the SMAs were put back on after the measurement. Before getting in the PSL I switched the PSL from the science mode to the comissioning mode. I did the vice versa when existing. In addition to it Stefan was manually aligning a couple of steering mirrors on IOT2L to center the beams on length diode and both WFSs. This ended before I started messing up the PSL RF connections.

 After these investigations Stefan found that all the demod phases got rotated by approximately 90 degrees so that the IMC length signal showed up mostly in the Q-phase. So for the reason we had to start over the phase adjustment.

The new demod settings:

It seems they came back to where they were with a descrepancy of roughly 10 degrees compared with the values we had until yesterday. The below are the new settings for the WFS demod phase.

• WFS_A
  • H1:IMC-WFS_A_SEG1_PHASE_R = -185
  • H1:IMC-WFS_A_SEG2_PHASE_R = -112
  • H1:IMC-WFS_A_SEG3_PHASE_R = -185
  • H1:IMC-WFS_A_SEG4_PHASE_R = -185
• WFS_B
  • H1:IMC-WFS_B_SEG1_PHASE_R = -80
  • H1:IMC-WFS_B_SEG2_PHASE_R = -132
  • H1:IMC-WFS_B_SEG3_PHASE_R = -66.5
  • H1:IMC-WFS_B_SEG4_PHASE_R = -173

And the below is a picture of the new setting for the delay line for the length demodulation.

The IMC controls :

 With the new demod settings we became able to lock the IMC with no major problems. A good this is that the UGF came back to the original high value of  60-ish kHz, which was 25 kHz this morning due to the missing factor of 3. However the WFSs seemed slightly unstable. We saw a slow oscillation in pitch at an order of 100 mHz which was visible in the reflection CCD. We thought this was due to a too much gain even though we are not sure why. We decreased the gain of all the DOFs in the WFS by simply disabling the 10 dB gain flat filter for each of them. Note that the overall gain H1:IMC-WFS_GAIN is set to be 1. It is working fine now without an oscillation. Good.

Alignment of interferometer :

We moved on to the global alignment of the interferometer. The Y arm cavity was tweaked to maximize the green intracavity power. We touched both ITM and ETM. The BS was aligned by using the opleve as a reference. Later on we did a fine alignment of the BS by looking at the amplitude of the beatnote and maximizing it. At this point we established the green beam path so that we had a reasonably big beatnote signal at ISCT1. Then we moved on to the alignment of the infrared path. We then tweaked both IM4 and PR2 to get a high transmitted light of the Y arm in infrared. The alignment was mainly done by touching PR2 in both yaw and pitch. As a result we got 400 counts in H1:ASC-TR_A_SUM_OUT when the 00 mode is on resonance. Since the highest value we got ever was about 500 counts we concluded that this was good enough for measurement of the noise spectrum.

HEPI turned off for the night :

We found that the cavity length moving quite a lot tonight although we didn't see an apparent seismic activity in the seismic strip chart in the control room. However this was obvious since the end PDH kept dropping its lock frequently. The fluctuation was at a time scale of 1 sec or longer and hence the HEPI offloading didn't help at all as it was too fast for it. As a test we turned off the ETMY HEPI by running the script. But this tripped the HEPI and everything else (TMSY, ISI, ETMY). We tried to bring the HEPI back on by running the script but it tripped again after immediately the control were engaged. But it turned out that the cavity was quiet if the HEPI was left off. So we decided not to turn it on for tonight. We proceeded the noise measurement with the ETMY HEPI off.

A near-future task:

The IMC guardian must wait for the refcav for a long enough time when it is being recovered so that the IMC won't kick the refcav until it settles.

Today, on BSC-ISIs:
- Calibration filters were reinstalled (the minus gain of the HEPI L4C is introduced in the calibration filter)
- The feedforward controllers were retuned/reinstalled on the 3 BSC-ISIs (The gain is 1 when engaged)
- The sensor correction filters were retuned/reinstalled on the 3 BSC-ISIs

At 18h50 PT:
- HEPI BSC6 and BSC2 are controlled in position
- ISI BSC6 and ISI BSC1 are controlled with
    - Feedforward ST0->ST1
    - Damping
    - Feedback Level 3
    - Sensor correction Stage 1 X,Y,Z
    - Sensor correction Stage 2 Y

ISI-BSC2 controlled with
    - Feedforward ST0->ST1
    - Damping

The DAQ went 10 years into the future for about 10 minutes this morning due to an IRIG-B error. Unfortunately this bogus time was then written into the raw minute trends. You will find if you ask for minute trend data which spans this time (approx 9:22 - 9:50 local time this morning) you will only get data up to 09:22. To get the rest of the data you will have to ask a second time for data from 09:50 onwards.

We stopped writing raw minute trends for a short while this afternoon and switched them to a new disk location. This will allow us to fix the now static broken files, most probably tomorrow.

Mark Barton, Gerardo Moreno, Arnaud Pele, Scott Shankle, Mike Vargas, Thomas Vo

Magnets were added to the plates.
B&K Testing performed; results are being reviewed.
Purchased ~20 18-8 SSTL 1/3-13 x 1.25" and 1.5" Flat Head Cap Screws (Made in USA) locally. Additional were Made in INDIA, but will not be used. Screws will be cut to size and Class A cleaned tomorrow.

Alignment Tooling and Baffle/Ring Spacer Bar have been Class B cleaned.
Forceps need to be shaved and re-cleaned.

We will begin working Arm Cavity Baffle for BSC9 and return to Manifold Cryopump baffle for ETMx on Tuesday (7/23)

Kyle
HAM1 currently vented but not nominally being purged (HIFO-Y noise), HAM2 under vacuum -> Closed HAM1 ion pump gate valve -> Opened HAM1 purge valve and exhaust of HAM1 turbo resulting in flow from bottom to top of HAM1 -> Returned to as found state after 90 minutes (purge valve closed, turbo exhaust capped) -> We are trying to systematically eliminate all adjacent external-to-vacuum potential helium reservoirs.  

Also, verified YBM leak detector calibration using external calibrated leak -> 5 x 10-8 torr*L/sec leak registered as 7 x 10-8 torr*L/sec value on detector -> Not a significant discrepancy for our current purposes -> left stored calibration factor alone

DAQ Re-start this morning at 9:22am(Dave & Jim)

Kyle working on HAM1 purge air flow, he finished before lunch

HAM6 cable running (Filiberto & Interns)

Running cable & bending conduit around HAM1 started this morning (Mark/Ed)

EY Field Rack Transfer Functions (Alexa/Daniel)

Prepping for Oplev work (Thomas)

Alarms in Labs--probably should raise alarm levels to 500 counts?

Stefan working on MC Electronics

Vincent restarted the DAQ for his work in the afternoon.

Dave and Jim

Second try to fix the dataValid=1 flag in the frame.

This morning we tried a version of the DAQ code which was tested successfully on the DTS yesterday afternoon. Unfortunately on the H1 DAQ the IRIG-B date was incorrectly read, putting the data concentrator 10 years and 5 days into the future. This then marked all the FE's as having bad timing.

We immediately reverted back to the original code. The whole excercise took about 15 minutes.

We are checking the configuration differences between L1, H1 and X1 to see why this would happen. Early result, the IRIG-B drivers between all three are definitely different.

(Corey, Keita)

Telescope Assembly

Now that we had a new set of machined Side Clamps (machined by Tyler and Class-A-ed over the weekend), we installed these parts on the Telescope Assy, and then installed the Primary Mirror.

Telescope Rough Alignment

With all Mirrors installed on the Telescope (the F1 [6"] Mirror is an IAS Alignment Mirror we are "iffy" on, we're waiting for some recently-ordered 6" Mirrors to see if they have a better coating), we started rough alignment of the Telescope.  This was done with autocollimators at the input and output of the Telescope and per Keita's alignment document (T1100603).  Next we were going to move to a more fine alignment with the IR Laser, but we discovered the 8" Alignment Mirror we were going to use had a frosted back surface, and this would not be useable for shooting the Autocollimator through it.  So, this is where we stopped for the afternoon.  Today (Wed), Keita found a gold-coated mirror to use for this alignment and will proceed from here.

SUS Cables Run

I grabbed two cables which run from the "roof feedthru" to the Test Stand at EY, and installed them at EX.

[Stefan, Alexa, Kiwamu]

 The IMC wasn't locking today. We found that this was because the demodulation phase changed.

The guilty RF cable:

 We took a look at the demod phase of not only the length diode but also both WFSs and found that the amount of rotation they got were identical. So we started suspecting something common, for example the cable length of the modulator. Eventually Stefan found that wiggling the N-connector of an RF cable rotates the demod phases by tens of degrees. This is the 4th output of the 24 MHz RF amplifier in the R1 rack at the field. In fact this is the one supplying the EOM with the 24 MHz modulation. This rotation happens more or less in a random fashion but the amount of rotation was relatively repeatable --- we could reproduce a couple of certain conditions with a certain demod phase by wiggling around the connector.

 We tightened the N-connector and it seems that the problem was solved. Additionally we briefly tested it by wiggling the connector again but we didn't see any more rotations.

Demod phase need to be adjusted again :

 Then an issue we got after fixing the RF cable is that all the demod phases were consistently off. Probably this may indicate that the we had been in a particular, but a different condition for a long time due to the loose connection at the RF connector. In any case we need to adjust all the demod phases associated with the IMC i.e. length diode and two WFSs.

Demod phase of the Length diode readjusted:

 We readjusted the demod phase of the length diode as a first recovery step. The new optimum setting, where the I signal is maximized, is

• 28.625 nsec = 1/8 + 1/2 + 4 + 8 + 16 nsec
• (This is set by the hardware switches at the front panel of the delay line phase adjuster)

Comparing it with the past setting of 14.4375 nsec (see alog 6282) we found that the amount of rotation we newly introduced is 123 degrees with the modulation frequency at 24078360 Hz. This resulted in a sign flip in the error signal. So we had to flip the control sign to properly lock the IMC.

Next step : readjustment of WFS demod phases :

 Apparently we have to do the same correction for all segments of the WFSs. Unlike the length diode the demod phases can be adjusted in the digital land. Since we now know that we need to rotate everyone by 123 degrees from whatever previous phase, correcting the demod phases should be relatively straightforward --- we simply punch in some numbers in the digital system. Of course we have to pay attention to the sign flip.

Just before the laser went dark, we discovered that the demod phases of both IMC length and WFS diodes had moved significantly, with all the signal ending up in the Q phase.

We found a bad connector on spigot 4 of the RF distribution panel, going to the EOM. Wriggling te cable resulted in ~30deg of phase shift.

The connector should be replaced tomorrow.

We reinstalled the primary mirror with re-machined clamp parts, and the new clamp parts worked well.

We're still waiting for the procedure to set the spring tension of the clamps right, but in the mean time we decided that 1/4 revolutions of the clamp screws after finger-tight felt about right.

Anyway, from there on we quickly set two auto collimators up, and roughly aligned the path correctly as per the procedure. 

Next we'll tune the telescope using a laser beam and mode master. That'll be about a day of setup and three days of going back and forth.

The PSL got down at around 5:50 PM in PDT due to errors in the diode and crystal chillers according to the status medm screen.

Gerardo Moreno, Scott Shankle and Mike Vargas

Attached the Face Plates. One screw on the Right Face Plate could not be attached (pic 2); hole does not line up. One screw on the Left Face Plate could not be attached (pic 1); holes do not line up.
Attached the Balance Weights and the Tongue Depressors released very nicely (pics 3 and 4).
The baffle was balanced using a Plumb Bob (pic 5).

The height needs to be checked. The Assembly Fixture and Crane will be needed if height needs to be changed.

Observations - the Face Plates are very flimsy and rattle a lot. They are tied to the baffle on the outer circumference only.

Launched a delayed overnight measurement on HAM3-ISI, with the help of JimW. 

Measurement should start around 9.50pm PCT. Horizontal isolation loops will be turned OFF then. Only vertical isolation loops will be left ON for the duration of the measurement.

Measurement will be finished by 8.30am PCT. Isolation loops will be turned back ON by then.