8:50 am, Arnaud running transfer functions @ ITMY.
8:55 am, Andres to LVEA, to work on or around the test stands, West bay area.
9:04 am, Hugh to LVEA, work at HAM5.
9:10 am, Jim B and Cyrus R working at Mid-Y.
9:27 am, Rick S, Craig C, and Chirs S to the LVEA, work inside the H2 PSL enclosure.
10:22 am, Kyle R, to LVEA, crane RGA equipment over Y-arm tube, he finished craning at 10:48 am.
10:30 am, Dave B, reboots and restarts for h1seih23.
11:49 am, Hugh, to LVEA, pick up tools from around HAM5.
1:35 pm, Kyle R, to LVEA, working with the 1.5" valve at gauge pair 124.
2:19 pm, Cyrus R and Jim B picking up hardware from Mid-Y, to retrive to EE shop.

Gerardo, Betsy

After having one failed ear bond early in the week on PUM ITM03, Gerardo sucessfully bonded both ears.

We also loaded PUM ETM06 (destimed for ITMx PUM replacement soon) onto the table and glued it's flag mounts and first of 2 prisms.  We'll get to the 2nd prism tomorrow hopefully.

While in the chamber, we also connected the 5 SUS and 1 ring heater cables to the feedthru and confirmed signal throughput on the 5 sus.  We pulled the C3 covers from both of the ETMy and TMSy suspensions before installing the corner cube. 

Jason and Doug should have a clear shot of the corner cube (and probably the edges of the optic) through the ACB from the spool.  We await X,Y,Z measurements.

JimW & MitchellR

We payloaded the ISI Keel with the 600 lbs per D1002266-v1 (v1 really?); each 150lb stack sitting on 8 in² of 1/4" thick viton.  See photo.

With that completed we unlocked HEPI and floated the platform (~15000lbs) on the HEPI DSCW Springs.  Next we shot level/elevation of the Optical Table.  See attachment for log notes.

The table actually started out pretty good, I thought we had disturbed it more during float.  The level had about 0.5mm runout and the elevationi was low 1.3 mm--all within spec.  We adjusted anyway to be 0.3mm runout and 0.2mm high.

Mitchell then joined Jim in chamber and moved the ACB deep into the Spool.  I then helped Betsy put the lift table into the chamber.  Jim & Mitchell moved the Table into the Spool and set the ACB atop the table.  Betsy & Travis were working to install the retroreflector for the IAS Y shot while Jason & Doug were getting their equipment readied,

The readback channels for the corner station ring heaters seem to not have been working properly since last Friday.  I've attached a graph that shows that the ring heaters seem to have turned off at 02-21-2014 22:5:32 UTC.  Judging from the ALOG around that time, there were a lot of reboots going on in software, I'm not sure about hardware reboots.  However, Kiwamu says that the PRC power level is looking like the ring heaters are on just based off of the amount of loss he measured.  He also advised that since the system is working well, I should hold off on trying to power cycle the TCS chassis until a later time but at the first chance I get, we should try to resolve this issue.

The ITMX ring heater is also displaying similar weirdness, which is expected since they share the same chassis and PLC.

(Alexa, Jax, Stefan)

Alexa was trying to hunt down a missing gain factor for her model and instead found a busted COMM PLL board (serial number S1200564). The op-amp for the VCO compensation stage (U37) was blown. I recalled replacing the same op-amp on the DIFF PLL about a month ago, suggesting that there's something that makes this particular op-amp vulnerable. After discussing with Richard McCarthy, we opted to change resistor R96 from 0 to 2k ohms to protect the poor thing. Lab tests show that it's in good shape, and it'll be back to the ISC rack as soon as we're done with the ISC meeting.

Due to ongoing problems with h1fw1, the default NDS server has been changed to h1nds0.

I have changed the core switch configuration to no longer forward broadcasts on udp port 5355 to the FE network now that DTT has an environment variable to do this, and said environment variable has been configured.  This will reduce some broadcast traffic on the FE subnet, as well as correct some other side effects that probably only I care about.

Fabrice, Jamie, Jim, Dave

I restarted all the models on h1seih23 to clear the no-DAC-output problem.

Sequence was: stop user models, restart IOP model, start user models

models are h1isiham2,3 h1hpiham2,3 h1iopseih23

Fabrice then put ISI ham 2,3,4,5,6 into a safe state, and I updated the safe.snap files in SVN and committed them.

This morning when I came in I found the HAM2/3 ISIs tripped.  I have tracked this down to what I believe to be a DAC communication problem in the front end.

While the models show output on their DACs, the IOP shows no corresponding DAC output on the same channels.  There are no error flag whatesoever to indicate that there might be a problem.  None of the watchdogs on this machine are currently tripped.

The image below show the DAC_MONITOR screens for H1IOPSEIH23, which shows zero on all outputs, and H1ISIHAM3, which shows and output of -958 counts on CH 8.

The dataviewer program has been updated for Linux and Mac OS X to correct issues with leap second handling and to allow short channel names to be selected from the menu.  Current version is now dv-2.8.1

Filberto, Daniel

We moved the doubler which drives the ALS fiber distribution box from rack ISC-R1 to ISC-R4. This hopefully reduces the electronics crosstalk between this unit and the PSL VCO. We als used a differemt RF patch panel in ISC-R2. The RF power levels have been re-measured, requiring to change the attenuator at the ALS fiber distribution chassis input from 1dB to 3dB.

I just spent another hour turning on ISI ETMX. (see previous elog for ITMX.)

This seems to me that most of the turn-on trouble comes from our attempt to turn on loops in an equilibrium position, and afterwards move to the target position. This move then leads to DC saturations in various sensors.

Question:
Why don't we put in fixed drive offsets - even after the DACkill - that allow us to make the OFF position equal to the locked position. This way the ISI never has to "move", we never have T240 saturations.

ITMY TF will be running overnight on opsws8. Started at around 20:45

In prepartation for tomorrows guardian deployment on ISI HAM2/3, I checked the configurations of the filter modules in the HAM2/3 ISIs, to make sure they are configured as needed for the guardian.  I found a couple of discrepencies that I've tried to sort out.

The BLEND configuration is not currently touched by the guardian code, so we're not working about their configuration for the moment.

The configuration of the DAMP filter modules seems to be as expected (FM1 loaded only with 'Damp').

The ISO modules were a different story.  ISI_HAMX expects the following filter banks to be populated for the vaious isolation levels:

• ROBUST: FM1 (Cont_1), FM10 (Boost_1_t2)
• MEDIUM: FM2 (Cont_2_a), FM3 (Cont_2_b), FM9 (Boost_2)
• HIGH: FM3 (Cont_3_a), FM4 (Cont_3_b), FM5 (Cont_3_c), FM6 (Cont_3_d), FM8 (Boost_3)

HAM2/3 has nothing in FM3/5/6/7.  I therefore added unity gain filters into those banks, and gave them the appropriate names.

The Boost_* filters also didn't have the 5 second ramp times that we decided we needed during the HAM4 testing.  I added those ramps as well.

I have saved the filter files, but I have not yet loaded them into HAM2/3.  I will load them when I start my tests tomorrow morning.

Mitchell and I installed the TMDs on the HAM ISI Blade Springs similar to as Hugo and I did on WHAM3.  Mitchell has the serial numbers.  There were also a couple feedthrus that needed to have the in-vac cable attachment screws secured.  Mitchell did this.

[Ed, Evan]

We are preparing to make a measurement of the length of the PRC using the phase-locked auxiliary laser technique described by Chris Mueller (T1400047). Previously, this has been used to measure the Livingston IMC length (LLO alog 9599).

We set down a 520 mW Lightwave NPRO on the IOT2R table, along with a Faraday isolator and steering mirrors. We will inject this beam into the PRM_refl side of the IOT2R periscope. The beam will hit the back of IM4, and a small fraction (2400 ppm) will be transmitted toward the PRM. This gives 1.2 mW of auxiliary power on the PRM, compared to 9 mW of 45MHz PSL single-sideband power on the PRM.

Most of the auxiliary power should reflect from the back of IM4 and return to the IOT2R table via the IO_forward side of the periscope. For mode-matching, we hope that we can simply send part of the IO_forward beam onto a New Focus 1611 and maximize the observed beat. Currently, there is 3 mW of power in the IO_forward beam.

Using this beat, or otherwise, we will phase-lock the auxiliary laser to the PSL carrier beam. Then with PRMI locked on the PSL sideband, we will sweep the offset to the auxiliary PLL and monitor the RF coming out of POPAIR_B. We should see the strength of the RF reach a maximum whenever the auxiliary beam is coresonant with the the PSL sideband. By tracing out the Lorentzian profile of the RF amplitude across successive resonances of the PRC, we can extract the FSR of the PRC. Given a design length of 57.6557 m, we expect an FSR of 2 599 850 Hz. If we can measure the FSR to within 100 Hz, we can get the PRC length to within 2 mm.