Alexa, Keita, Gabrielle, Dan, Sheila

The bottom line: X arm is locked on green, we are having trouble finding the beam on ITMY and it might be helpfull to have a camera on ITMY tomorow. 

Both PLLs are now working.  Both beatnotes needed to be realinged.  I reduced the power on the end Y BBPD, and realinged the laser green power monitor diode which was totally off. 

We spent some time searching for the green beam on the ITMY baffle PDs, but didn't find the real beam, I think. 

There is a beam which doesn't seem to have enough power, which can be found on PD1 at 2.2PIT, 7.3 YAW (20dB gain setting we get 3.6 Volts)  PD4 at -97.8 PIT 74 YAW (3.6 Volts, 20dB setting) When aligned to the center of these points, there is no beam arriving on ISCT1, and we could not find any return beam on the ETM baffle PDs even after a long search.  The ETM baffle PDs are working, since they clearly see the IR when PRMI flashes.  I have left  slow excitations on TMSY pitch and YAW hopping that at some point we will see light on the ITMY baffle PDs. 

Other things today:

Keita and I briefly tried to move the bem spot on PR2, using the output matrix he described here :  alog 13939

To do this we coped the gains from the opticalign filter banks into cal filters for pitch and yaw of iM4, PRM, PR2, and PR3.  However, when I briefly tried moving the spot around I misaligned the cavity. 

Gabrielle and I also tried locking DRMI using the configuration Kiwamu described from last night.  We were able to see any lock longer than a few seconds. 

PRMI however seems to be locking consistenly within a minute. 

Thanks-H

Sudarshan, Peter, Keita, Gabriele

Checking the power on the diodes

According to the electornic schematics, the ISS second loop transimpedance board has two parts:

• the transimpedance has large bandwitdh and a conversion factor of 1600 V/A
• the following part is a "whitening" filter with a DC gain of -20 dB, inceasing after a corner at aout 10 mHz, flattenig at about +66 dB at 10 Hz, and then low passed above 200 Hz. See the first attachment for a Bode plot

With the present input power of 10 W, we should have something like 10 mW into the array, which means 1.25 mW per photodiodes, corresponding to about 1.0 mA of photocurrent. After the transimpedance we should get 1.6 V  and 160 mV at the output of the board. This should corresponds to about 260 counts. However, we see that the RMS of the photodiode signals is about 17 counts and dominated by high frequency, while the mean value is ver close to zero, about 1 count (see second attachment, one minutes of data). It seems that we're not getting all the power we should.

We also checked in the electronics lab, with one spare board, that sending 1 mA at the input gives the expected signal levels both after the transimpedance stage and at the output. We also checked that adding a long cable at the input doesn't have any effect on the result.

Calibration of PD signals

Using the nominal whitening transfer function and transimpedance, we computed the calibration filters t be implemented in the PD filter banks. We don't want to have any 10 mHz pole, so we actaully fitted the whitening ransfer function between 1 Hz and few kHz, see third attachment (blue nominal TF, green implemented TF). Therefore, the PD_OUT signals are calibrated in mA only between about 1 Hz and 5 kHz. Below and above the signals are uncalibrated. This is expecially true for the DC level, which is not correct. Later on, once we'll have solved the missing power problem, we'll implement a calibration in units of RIN.

The result are shown in the forth attachment. The high frequency content of the 1-4 diodes (one board) is clearly different from the 5-8 diodes (the other board). We still don't know if this is due toa really different signal or to a different response of the board. Again, once we'll have solved the missing power problem, we'll see if this difference is still there.

Picomotor game

Right now we are quite sure that the beam is not properly hitting the PDs:

1. the power level is very low
2. the signal level on the eight diodes is quite different
3. there is a large coupling of angular motions to power

So we wanted to move the beam using the two mirrors with picomotors. Of them, we were sure of the cabling of only the older one, which is the one closer to the ISS box and after the telescope. To make the story brief, we moved the picomotor by few 10000 steps in horizontal, bua saw no difference either in the QPD or PD signals. We could however see some "shaking" of the signals. Instead, moving in the vertical direction produced no result. So we're not sure if the picomotor is actually working. As for the second picomotor, we could not understand if it's cabled or not.

More investigations on the pico story tomorrow...

The water level is near the max line and does not appear to need to be filled.

07:56 Hugh running transfer functions on HAM6
08:33 Aidan to HAM4 to connect electronics for Hartmann sensor
08:37 Portable toilet service
08:41 Alexa to end Y to check layout of ISCT table
08:45 Filiberto and Manny pulling cables for TCS near HAM4
08:46 Bubba craning 3IFO equipment at mid X (WP 4862)
09:03 Danny S. to LVEA test stand
09:29 Hugh to HAM6
09:45 Unifirst delivery
09:54 Alexa back from end Y
09:59 Hugh back from HAM6
10:17 Kyle starting work to open beam tube arms (WP 4863)
10:18 Alarm on LT150 cyropump (delivery?)
10:43 Kiwamu compiling and restarting the H1ASCIMC model (WP 4864)
11:46 Kiwamu restarting H1ASCIMC model
12:06 Chris to clean at mid X after lunch
12:44 Kiwamu restarting H1ASCIMC model
12:55 Danny S. to LVEA test stand
12:57 Kiwamu restarting H1ASCIMC model
13:17 Sheila to end Y to lock ALS laser to PSL
13:24 Aidan back to HAM4
~15:20 Fire department on site to check trouble alarm
15:40 Betsy to LVEA test stand
15:44 Peter, Keita to look at electronics racks near HAM2
16:05 Jim B. restarted the DAQ for the H1ASCIMC model change

High dust counts in the Vacuum Prep Lab

Aidan. Greg.

Filiberto helped dress the cables in the H1-TCS-R1 rack. All the connections to the HWS table are now secure. I was able to turn on the HWS cameras and RCX C-Link converters remotely with the Beckhoff system. And I was able to log into H1HWSMSR and successfully connect to the HWS cameras.

HWSY

> serial_cmd -c 0

>> gcp

returns camera information

HWSX

> serial_cmd -c 1

>> gcp

also returns camera information

It appears that around noon each day, including on weekends, both the dust monitor in the beer garden and near HAM 6 are registering high dust counts. A plot of minute trends for the last 30 days is attached. Location 15 is in the beer garden. Location 6 is near HAM 6.

It started near HAM 6 on Sept. 4 and in the beer garden around Aug. 30.

Restarted data concentrator (and frame writers, nds, and broadcaster) to clear the bad DAQ status on the h1ascimc model.

JeffK, JimW

I spent the afternoon trying to get feedforward working at ETMX, but I've had little luck so far. Currently, we are using a high blend on the St1, per Sebastiens posts  last week. This costs us at low frequency, so we wanted to see if we could gain some of that back by getting extra performance out of HEPI. We would like to try feed forward, versus ground to st1 sensor correction, because this lets us partially get around the Z-RZ T240 coupling the seismic has been dealing with for a while, by reducing the amount we are driving on St1.

When I looked at EX initially, the HEPI platform had none of the Hua sensor correction/feedforward filters installed, so I copied the IIR from the EX ISI foton, and the FIR from the EY HEPI .fir file. When I tried turning on the HEPI STS Z feedforward loop, with a gain of .1 the ISI vertical drives started ringing up. After a few calls to Fabrice, I realized that, per JeffK's alog 13560, the EX HEPI had never had it's STS cal filter adjusted for the T240 we are temporarily using. I fixed that, and Jeff helped check that the ISI, HEPI and PEM sensors were all seeing the same ground. We then looked at the coherence between the St1 T240s and the ground. Currently the St1 sensor correction is working at EX, which affects that measurement. The attached 1st picture shows the coherence between the STS Z and the St1 Z, the black dashed line is with St1 senscor running, the green is without. The high green coherence is encouraging, it means we can do a lot of good with FF if we can get it running.

We then tried turning on the HEPI FF with a gain of .1 again, with the St1 senscor turned off. Pretty much immediately we saw a bunch of higher frequency stuff in the BLRMS and in a rolling DTT plot, my second attachment. After a bit, while we were distracted by HAM2, EX tripped in spectacular fashion (last two pics, first is zoomed on when I think we pushed the button, second is of the trip), so we've given up for the moment. EY might be easier, with it's more nominal configuration, but the filters installed in foton down there are not the Hua standard filters, so I'm not sure what has been done there.  We also have a filter designed by RyanD that I can try, but that will require more foton copy/paste.

Dumped unpumped gate annulus volumes of GVs to be opened into pump carts -> Opened GV5, GV7 and GV18 -> Valved-in IP12 -> Valved-out X-end turbo -> Isolated and removed pump cart from BSC5 -> Opened GV20

Reset HEPI L4C WD counters for HAM2, HAM3, HAM4, HAM5, ITMX and ITMY.

J. Kissel, J. Warner, K. Izumi.

Jim and I were working on ETMX; wiamu rolled over asking us what's up with HAM2 ISI. It had single-saturation tripped on actuators. We've got no idea. Our best guess is Kyle jumping around opening up the ARMs, but it's a terrible guess and probably not right. Sensor correction on HAM2 has been turned off since this morning.

#fortherecord

Following Joe's work at LLO on the ASCIMC model (see LLO alog 14538), I recompiled and restarted the h1ascimc model with the latest master library block. This was under WP#4864.

Here are the major changes that one might pay attention:

• The trigger signal changed.
  • We used to use IMC-TRANS (which is a PD on IOT2L) for activating the ASC loops.
  • Now it uses MC4_TRANS_SUM instead.
  • Confusingly, the LSC trigger still uses IMC-TRANS.
• Normalization of the trigger signal
  • In the triggering process, MC4_TRANS_SUM is normalized by the PSL power, IMC-PWR_IN. Sp pay attention to the hidden parameter.
• I temporarily put an artificial offset in IMC-PWR_IN (see the attached screen shot below)
  • Since IMC-PWR_IN is not reading sensible values, I put an offset of 10 counts and disabled the input for now in order to simulate an ideal situation where we have the correct readout of 10 W.
  • We should fix this issue.

• I reset the trigger threshold values (see the attached screen shot below)
  • in order to adapt it to the new trigger signal.

• The input matrix expanded
  • The ASC input matrix now takes 6 signals in total as the DC signals of WFS_A and _B are newly added.

QUAD 06 (Q6) Phase 1B transfer function plots are attached.   We had a hard time obtaining good coherence in the Transverse TF, so it is a bit hashy.  Will try again.  

Most notably is that, like Q8, the second pitch mode frequency is unexpectedly pushed upward on the main chain.  Recall, we never found the mechanism to fix it on Q8.  Interestingly, both the Q8 and Q6 assemblies are of the same batch of wires and are fresh builds, but by 2 different assembly teams, and on 2 different solid stack/test stand units.  Q8 is an ETM type of QUAD while Q6 is an ITM QUAD, but both main chains have the same pendulum parameters - both are detailed in the 'wireloop' model.

The Q6 data is plotted as QUADTST.

Alexa, Gabrielle, Kiwamu, Sheila

This morning we moved PRMI to the 3F sensors, we used a gain of 3 in the input matrix to move PRCL from REFL 9 I to REFL 27 I, and a gain of 15 to move MICH from REFL 45 Q to REFL 135 Q.  This was locked from about 22:26:55 UTC (september 22) to 22:33:20. 

We then tried to move on to DRMI but have struggled most of the day to get it locked.  We locked it a few times this morning, (21:00 UTC) but haven't been able to recently. 

Also, as is typical recently, the anthropogenic noise is higer durring the evenings than durring the day, there must be an evening shift of hanford work.  Screen shot of the last week is attached. This pattern started in mid august and has been true since then.

B. Weaver, T. Sadecki, D. Sellers

Today we laced reaction chain cables and plugged in UIM and PenRe OSEMs.  We then began another round of R0 TFs.  TF results pending.  Offsets and gains for the lower stages are as follows:

L1UL 19173 1.565  -9586
L1LL 27412 1.094 -13706
L1UR 24370 1.231 -12185
L1LR 23612 1.271 -11806
L2UL 22949 1.307 -11474
L2LL 24546 1.222 -12273
L2UR 24855 1.207 -12428
L2LR 23608 1.271 -11804

These have been loaded to MEDM.