(Keita Daniel)

A spare BBPD with serial number S1200247 has been modified by removing and bypassing U1, the first RF amplifier stage. The attached BBPD_tf1.pdf file shows the transfer function before and after. Plot tf2 shows the ratio.

We took a baseline intermodulation product measurement by sending a two tone signal into the AM laser. The first tone was at 45 MHz and generated a line with -15 dBm amplitude. The second tone was a 90 MHz line also at -15 dBm. Plot IP2.png shows IP2 and IP3 lines at 135 MHz and 180 MHz with amplitudes of -57 dBm and -60 dBm, respectively.

The plot labeled IP2M shows the same measurement after the removal of U1. Close-in plots IP2M135 and IP2M180 show spectra with lower resolution bandwidth. The intermodulation lines are visible at a level around -115 dBm. One might consider this an upper limit, since the dominant distortion could be in the AM laser head. The IP2M135A plots shows one of the lines moved by 100 Hz. This now separates IP2 (lower frequency) and IP3 lines.

Finally, the IP2Mplus plot includes 20 dB higher drive levels to bring the lines back to -15 dBm. The 135 MHz lines shows up at -90 dBm which seems puzzeling low compared to the above measurement.

BBPD S1200234 has been replaced with BBPD S1200247 on the ISCT1 table. This will be our new REFLAIR_B.

Daniel has modified #247 by removing the MAR-6SM amplifier. From Koji's measurements (LHO#14901), we expect this to increase the IP2/IP3 of the amplifier chain and therefore lower the intermod products in RF27 and RF135.

The dc readout should be the same (i.e., we expect to read out ≈ 27 mW from the PD), but the rf readouts should be reduced by a factor of 10 in amplitude.

After installing, I resteered the beam (both in pitch and yaw) onto the PD using REFL-M3.

(For Evan and Nic)

Our current alignment procedures:

1. Lock green to both arms. Make sure all the sus guardians are in the proper configuration, ie. SUS_ETMs, SUS_ITMs, and SUS_TMSs are all aligned.  H1:ALS-X_TR_A_LF_OUTPUT should be a little above 1 cnts, H1:ALS-Y_TR_A_LF_OUTPUT will be a little below 1 cnt. Align ITMs and ETMs as needed (if hopless, check TMS alignment on ITM baffle PD1 and PD4). Make sure both ALS_XARM and ALS_YARM guardians are set to LOCK_NO_SLOW. 

2. After you are satisfied with the green alignment, make sure LSC_CONFIGs guardian is managed, and run ISC_DOF guardian to INPUT_ALIGN. This should lock the IR to the x-arm and misalign the y-arm cavity. You should see LSC-X_TR_A_LF_OUT go to around 1cnts. This will start the asc wfs and adjust IM4, PR2 to improve IR input alignment. Verify that LSC_ASAIR_A_LF_OUTPUT goes about 4,000 cnts. Then on ISC_DOF run SAVE_INPUT_ALIGN, this will offload the asc wfs to the alignment sliders. You MUST save the alignment values (ASC --> IFO_ALIGN.adl). 

3. Then, on ISC_DOF run PRM_ALIGN. This will first lock PRX and engage the asc wfs for PRM to maximize the power buildup in LSC_ASAIR_A_LF_OUTPUT. Once you are satisfied with the power buildup, run ISC_DOR OFFLOAD_PRM so that the wfs are offloaded to the alignment sliders, again you must save the new alignment. 

4. Set ISC_DOF to DOWN, and LSC_CONFIGS to MICH_DARK_LOCKED. Using the AS_AIR camera align the BS manually and save your new alignment values. 

5. Return to ISC_DOF and run SRM_ALIGN. This will first lock SRY and engage the asc wfs for SRM to maximize the power buildup in LSC_ASAIR_A_LF_OUTPUT. Once you are satisfied with the power buildup, run ISC_DOR OFFLOAD_SRM so that the wfs are offloaded to the alignment sliders, again you must save the new alignment.  (This step only required for DRMI locking).

FOR PRMI SIDEBAND LOCK: Set ISC_DOF to DOWN, set LSC_CONFIGS to PRMI_SB_OFFLOADED

FOR DRMI: Use ISC_DRMI and go to desired state. You will need to align various optics on your own because this guaridan does not manage any of the sus states. 

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ALS_COMM guardian runs on its own, and can be set to IR_FOUND. 

ALS_DIFF can be set to the LOCKED state. You will need to enter the LSC input matrix (H1:LSC-PD_DOF_MTRX_SETTING_1_28) on your own. At the moment the script leaves this as zero since our gains have been changing. The LSC_DARM boosts are also currently commented out. 

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A useful striptool: /ligo/home/alexan.staley/Public/StripTemplate

*note: Observation Intent Bit was set to "green" at some point last night. The aLog did not reflect this action. Also, aLog crashed sometime after 10:55 last night.

*note: Intent bit was not set to "commissioning" until 08:39

*Suggest that notification be posted for cleaning crews at main access points IF actual intention is for NO acces to (L)VEAs be granted as long as OIB is set to "green"

*note: Accesses made to LVEA while OIB set to "green": (this is purely FYI as cleaning crews have generally been given access prior to 08:00AM.) 

06:43 Cris into LVEA

07:08 Cris out of LVEA

07:09 Cris into LVEA

08:00 Daily Checklist performed. (Observation Intent Bit*) Nothing out of the ordinary to report. Every point functioning nominally.

08:!5 Betsy into LVEA

08:25 Karen into LVEA

08:32 Betsy out of LVEA

08:33 Karen out of LVEA

08:39 Observation Intent Bit set to "commissioning"*

09:00 Jeff and Andres into LVEA

09:12 Kyle headed to both end stations

09:18 Fil out to EX

09:50 Fil back from EX

09:58 Kyle back from Ends

10:00 Reservation System used to note commissioning activity

10:20 Suresh into LVEA w/comm appr

10:20 Mitch out of LVEA

10:14 Dale informed me of a group of high schoolers in for a tour ~13:00ish.

11:03 Corey out to LVEA w/comm appr

11:18 Suresh out of LVEA

11:30 Kyle informed me of a chilled water leak in the mechanical room. This leak is non-consequential to anything critical and he should have it repaired sometime after lunch.

11:31 Jeff and Andres out of LVEA

12:23 Krishna headed to EX. Not going into VEA.

12:51 Suresh backk into LVEA

13:37 Jeff and Andres into LVEA w/comm appr

13:38 Dale with tour group into control room ~10min

14:28 Jeff and Andres out of LVEA

15:30 Corey in control room with tour ~5min

15:39 Corey with tour out to roof.

I put 0.75 smoothing on the Supply & Return Pressuresmthat calc the differential pressure this morning.  I couldn't smooth the calc'd channel with CAPUT, it may be better to smooth it directly but it may only be possible with a database change.  I'll run this way for the weekend and see how things look overnight.

The week of 11/10 - 11/17 the LVEA will be split into a Laser Hazard area (South and East bays) and Laser Safe area (Beer Garden, North and West bays)as described in the TSOP M1400342. This split safe/hazard will be during the morning hours of 08:00 to 12:00 and there will be partitions with signage in place marking the boundaries of the two zones. 

   During these hours additional barriers restricting foot traffic will be in place along the south wall starting at BSC1 and in the west bay between HAM-12 and the Y-Arm Spool.    

We quickly looked at the damping filters we have on ETMX to compare to the L1 version.  Things are pretty similar, other than 60 Hz notches and different gains.  In yaw LLO uses a factor of 4 more gain, in length we have a factor of 2 more gain, in pitch we have a factor of 3 more gain.

I wanted to see if our ETMY F2P problems were saturation related. So I looked at the current monitors for the L1 OSEMs.

One thing that was quickly noticed is that while the three others show <100 counts in the readback when there is no drive signal, the LR coil shows -4000 counts. (For scale, saturation occurs around 13000 counts for the three normal looking coils).

This would seem to indicate some problem, possibly removing a third of our range in one direction of one of our coils. However, when you actually drive the coils to saturation, they all seem to have the same range from the point of view of the DAC, just with LR readback offset from zero by 4000 counts.

So this could just be a problem in the readback, not clear without looking at the analog electronics.

(Alexa, Evan, Sheila)

We made a transfer coeffecient measurement of the M0, L1, L3 stages for both of the ETMs so we can make a full comparison of the current confirguration we have. We excited in each LOCK stage at a frequency of 0.33 Hz (with no filters turned on), and took a transfer function of the oplevs in pith and yaw relative to the green arm locking control signal. The results are as follows:

ETMY:

ETMX:

Evan found no coherence between his excitations and the yaw oplev which is why those results are empty.

Conclusion: The ESD stage has the worst response for both ETMs in pitch, followed by L1. In Yaw, ETMY L3 and L1 are equally bad. ETMX seems to be worse than ETMY. This is a bit surprising since we only see green transmission drifts in the y-arm when we lock DIFF. One important thing to note is that we do not actuate on L3 at this frequency in ALS DIFF since the crossover between L1 and L3 is around 2 Hz as noted in alog. 

For reference the templates can be found under: /ligo/home/sheila.dwyer/ALS/HIFOXY/ETMY_L2AngleNov72014.xml and /ligo/home/evan.hall/Public/2014/11/ETMX_L2P.xml  

Kyle, Bubba

Found the leak to be coming from the pump shaft -> Closed valve at pump inlet -> Using absorbent mats to soak up liquid (~1 gallon spill) -> Added water into chilled water system -> Will order pump replacement

The output from this booster pump supplies the Kobelco compressor, AHU3 hallway taps (no longer used) and the LVEA (no longer used) -> This chilled water branch "dead heads" (no flow) when the Kobelco compressor shuts down as the solenoid water valves close when the compressor is deenergized. 

Expect substantial 1-3Hz seismic noise from Hanford hauling on both day shift and swing shift today (11/7).  No Saturday activity is expected.  The daily numbers of truck trips in the current era are higher than S5 levels, especially on swing shift, and are comparable to or higher than S6 levels.  I drove to PNNL on Stevens in the middle of the day yesterday and saw nearly a dozen dumpster-carrying trucks traveling either north or south in a 10-minute span.   

3IFO:  inventorying OpLev; transferring SUSs from temp containers to permanent ones; working on viewports; SEI assy started; Mitchell packing masses; bifurcation preperation for LVEA started (to go into effect on Monday) see LIGO Document M1400342-v2

Commissioning: Will start @ 10:00 AM today

SEI: Nothing to report. Business as usual.

CDS: work @ EX to end at 10:00

SUS: couldn't hear what was said.

Diff Power seemed to be creeping towards the high 9% range. The REFSIGNAL voltage was set to -2.04 from -2.02. The result is 7.5% diff power.

Alexa, Evan

In preparation for locking DRMI with reduced power on REFLAIR_B, there is now a BS1-1064-90-2037-45P (90 % reflector at 45° for p-pol) ready to go on ISCT1. It is not yet in the beam path. There is also a dump ready to go.

There is maybe some confusion about the polarization state on the table. LHO#7032 says it's s-pol, but (1) at least a few of the 45° optics on the table are marked 45P, and (2) we initially tried to install BS1-1064-90-1025-45S (90 % reflector at 45° for s-pol), and we got 10 mW / 27 mW = 37 % transmission rather than the expected 10 % transmission. We should go out there with a PBS and see what's going on.

After installing the s-pol optic, we did some resteering of the yaw on the REFL-M3 mirror (see D1201103) in order to recenter the beam on the PD. When we removed the s-pol optic, we steered it back.

Betsy, Travis

Attached are the results from the first round of testing of this QUAD.  What we see:

1) Very poor coherence at low f which I had a hard time improving

2) Some cross coupling between T and R on the main chain

3) Some minor cross coupling between some P and L on the main chain

4) The 3rd L mode or 2nd P mode is split and the 2 are cross coupled on the reaction chain

Alexa, Nic, Evan, Dan, Sheila

Tonight we went back to trying to get ALS DIFF working well.  We aren't sure what the problem is. 

First Nic checked that the gain of the 2 ESDs were the same.  The old X gain in L3 LOCK L was 0.2, the new one is 1.12 The old Y gain was 0.7 the new one is 0.384.  We also checked the crossover by using the green control signal. 

Attached are some plots, based on the suspension model that Jeff used to design the DIFF loop, and filters downloaded from foton. This is using none of the boosts for DIFF, which is how we have been running the last few nights without being able to use the ESD.  The two plots on the left are the cross overs for our loop, and the open loop.  We can use these plots to compare what we have now to what Jeff originally designed, (G1400146-v2)  We also copied the livingston filters, see alog (12590), their crossover is the third plot while their open loop (we added a scaling factor to get the right ugf) is the last plot on the right. 

Btoh ESDs are driving, but we seem unable to use them in the loop. 

I wanted to try turning on HEPI sensor correction at EY this morning, but I've run into an issue. When I turn on just the new Mitt_sc filter no numbers come out of the outputs. However, when I turn on the filters associated with the fir sensor correction, numbers come out. Even when I just turn on the path, with no filters engaged, numbers come out of the output block. Something about engaging the sensor correction filter completely cuts the signal. I will try copying the filter to a different fm when I get a chance.