Scott L. Ed P. Chris S.

5/21/15
Cleaned 9 meters and finished at HNW-4-058. Removed lights and rehung them in next section north. Vacuumed support tubes and sprayed diluted bleach/water solution on heavily soiled floor areas.

5/22/15 Scott L. & Ed P.
Cleaned 2 of the large box fans for circulation in the tunnel and gave the vacuum machines a complete cleaning. The crew left at 11:00 A M today and will take the entire week of 5/25 off. We will resume cleaning operations on 6/1.

To date, a total of 3127 meters of tube have been cleaned and all support tubes in that length have been cleaned and caps installed.

I looked at the following channels:

H1:IOP-SUS_EX_ADC_DT_OUT_DQ
H1:IOP-SUS_EY_ADC_DT_OUT_DQ
H1:IOP-LSC0_ADC_DT_OUT_DQ

H1:IOP-SUS_EX_DAC_DT_OUT_DQ
H1:IOP-SUS_EY_DAC_DT_OUT_DQ
H1:IOP-LSC0_DAC_DT_OUT_DQ

Attached are 6 figures, broadband and close-ups to the 960/961Hz signals.

Notable features:

1) The EY spectra don't look right at all.  The doutone signal is missing (SUSEYcloseup.pdf) and the spectrum has a positive slope (SUSEY.pdf).

2) All of the plots show a comb of 1Hz harmonics. Probably not surprising.

3) All the DAC channels (in blue) show extra noise (see all the non-closeup).

We have a 0.4mm vertical drive on the BS HEPI Vertical Actuators.  Long story but with the HEPI loops open, this platform sags low enough that the IPS are no longer in their linear range and behave poorly giving us tilt coupling.  Our pump station system pressure still has some coherence with the BS platform so I wanted to check if this large drive on the BS Vertical was increasing that coherence.

Bottom line, I'm not sure.  I took a reference coherence look and then lowered the vertical on the hepi loops by 0.2mm and took another set of data.  Attached are the results.   The reference traces are the normal offsets and the current plots are with the offsets reduced.  I'm looking at the T240s on the ISI stage1.  Conclusion, ehh, it all just looks noisy, some places better some worse.  There is a band in the X dof that seems broadly better from 10 to 25mHz but I'm not sure if it is meaningful.  I'll look at the HEPI platform channels rather than just the ISI channels too and maybe I need to drop it the full 0.4mm to really see an effect.

Ben, Calum, and Gerardo,
We received the two Gas Delivery systems, and two TMDS units (S1500093 and S1500094).  We assembled the remainder of the table, and then mounted the Gas Delivery system.  Lacking the final mounts, we put the TMDS on a screw jack so we could easily connect it to the Gas Delivery system.  Once all hooked up, we attached the electronics, and put both TMDS systems through their paces, and tested them for ion production.  We had two issues with S1500094 that we fixed.  The first issue was that we accidentally swapped the cables going to the Baratron and Pirani gauges, which we believe damaged the Pirani gauge somehow.  The second was that the cutoff valve leading to the vacuum pump would not seal completely.  Gerardo took the whole thing to the clean room removed the suspect parts and replaced them with new ones sent from Caltech.  Both new parts were found to work fine.  The valve ended up having a cut and frayed Viton o-ring, which explained its problem.  We are going to get an RMA for all things, and see what we can have done.  Currently, the two TMDSs are in perfect working order, and have been fully checked out.  We shipped the TMDS Interface back to caltech for further refinement, and so I can continue testing the units that we have there.  Pictures of the system, and videos showing the operation procedures can be found at: https://dcc.ligo.org/LIGO-E1500252  These instructions are in support of, and superseded by information found in Rai's procedure document here: https://dcc.ligo.org/LIGO-T1400497  Test data collected from all tested units will go into the DCC next week.  
More information, and drawings can be found here:
Gas Delivery System drawing: https://dcc.ligo.org/LIGO-D1500078
TMDS drawing: https://dcc.ligo.org/LIGO-D1400331

      

Peter, Calum, Ben, Rich

Took transfer functions (1Hz to 10kHz, 255 points in to the DAC Drive Input on the front panel of the ESD driver, out of the respective SHV connector going to the ETM) of all the quadrant paths of the newly installed LN Driver.  The results are stored in:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/PreER7/H1/Measurements/ElectronicsMeasurements/
under the following file suffixes

UR -> TFSR785_22-05-2015_102054.txt
LR -> TFSR785_22-05-2015_102804.txt
UL -> TFSR785_22-05-2015_103546.txt
LL -> TFSR785_22-05-2015_105053.txt

Everything looks good as compared to the Spice model.

Also, we measured the output noise of each channel at 20Hz with and without DC bias.  Results are all consistent with the design (<40nV/rtHz at 20Hz and above) and Spice model.

0V bias/-7.4V bias
UR -> 21nV/rtHz/32nV/rtHz
LR -> 22nV/rtHz/30nV/rtHz
UL -> 23nV/rtHz/37nV/rtHz
LL -> 28nV/rtHz/37nV/rtHz

Analyzer Noise Floor 10nV/rtHz @ 20Hz

Typical output noise at higher frequencies is:
20nV/rtHz @ 50Hz, 22nV/rtHz @ 100Hz, 20nV/rtHz @ 150Hz

Noticed that there is still a discrepancy in the DAC monitors for the user model vs. the IOP.  Richard has the details and Jeff will likely follow up next week.

Once Richard sorts out the somewhat touchy vacuum interlock (he's working on that now and knows the problem), the entire system is now functional and ready for use.

I logged into H1HWSEY and restarted the EPICS IOC. A new channel (H1:TCS-ETMY_HWS_FREE_DISK_FRAC) was added in v1.1.8 of the HWS code and the IOC had to be restarted to incorporate it.

I was asked to add to the SUS Guardian the ability to turn off the DarmDamp filter block outputs when the suspension goes into SAFE and turn them back on when the other outputs are turned back on (ENGAGE_DAMPING). To do this I added three methods in sustools2.py in the same style as the rest of the methods for filter blocks, and the appropriate dictionary values to susData. These filter banks are located on the quads in the M0 stage and act on the V,R degrees of freedom. 

Added methods are:

    # Methods for DARM_DAMP blocks
    def darmDampPvs(self, levels=[], chans=[], suffix='', verbose=False, withprefix='bare', matlab=False):
        return self.levelfilterblockpvs('darmdamp', levels=levels, chans=chans, suffix=suffix, verbose=verbose, withprefix=withprefix, matlab=matlab)
        
    def darmDampOutputSwitchWrite(self, enable, levels=[], chans=[], verbose=False, pair='none', withprefix='bare', matlab=False):
        return self.genSwitchWrite(self.darmDampPvs, 'OUTPUT', enable=enable, levels=levels, chans=chans, verbose=verbose, pair=pair, withprefix=withprefix, matlab=matlab)
    
    def darmDampOutputSwitchRead(self, levels=[], chans=[], verbose=False, pair='value', withprefix='bare', matlab=False):
        return self.genSwitchRead(self.darmDampPvs, 'OUTPUT', levels=levels, chans=chans, verbose=verbose, pair=pair, withprefix=withprefix, matlab=matlab)

I tested the new code on ITMY, and SR3 just in case, and it all seems to work well. The new code is committed to the svn and loaded into all of the quad guardians.

Richard, Jim

The h1susey computer will be unusable for a while as we investigate 18 bit DAC problems.  Initial investigation shows that D4 now fails to do it's auto calibration, where it initially succeeded when the computer was first started.

Jim W.: work on FF and blend filters on HAMs 4 and 5
Hugh: possible check of vertical offset on BS HEPI

Richard, Jim B: investigate problem with ETMY SUS DAC
Richard: investigate ETMX ESD drive

Jason: PSL alignment

Sudarshan: end Y PCAL calibration

Apollo: beam tube cleaning

Peter F, Evan, Kiwamu,

ETMY was not damping today. It sometimes damps OK and sometimes does not. When it does not damp, it grows an oscillation in pitch at 0.5 Hz. Also, steering the suspension often kicked the suspension for some reason. After many hours of investigation, we finaly found that the DAC outputs show some discrete steps in every ~ 2000 counts or so. This, of course, made the actuators highly nonlinear. This was very sneaky -- one would not notice until he or she crossed a discrete point because the actuators are locally linear. The attached is a screen shot of StripTool showing the nonlinearlity. The purple curve is the requested DAC counts and the yellow one is an actual analog voltage observed by VOLTMON. As seen in the screen shot, the analog signal has multiple discrete steps. This behavior was seen at all 6 coils on the M0 (top) stage of ETMY and very repeatable. We didn't have energy to check the lower stages and therefore we don't know if this is true at the lower stages.

We must fix this issue.

Jeff, Calum, Ben, Rich

Today we got quite a bit of the controls checked out on the Y-end ESD.  We verified the functionality of the following:

1.  All Quadrant analog drive and readback signals associated with the HV and LV ESD are working.  The readback channels for the LV ESD were verified at the channel level, but are not yet incorporated into the MEDM screens.
2.  All 15 binary control and readback channels are functional

We ran into trouble on the Bias drive channel, which we troubleshot down to the DAC card.  A new DAC card (SUS DAC 4) will have to be installed to make this functional.  We also need to finish taking the transfer functions of the installed system.  Jeff has left us specific instructions for doing that in the morning.

We had 3 or 4 trips of both HV supplies while we were working, leading us to be suspicious of the vacuum interlocks associated with the HV ESD.  This has not yet been explored much, but will prove annoying if it persists as you cannot remotely reset this particular trip.  It could be associated with us relocating the interlock chassis within the SUS field rack, but the chassis in question seems simple enough to have tolerated a small move.

Here is a summary for the use of the manual control test fixture (D1500130) associated with the LV ESD amplifier:

Function -> State -> Meaning
HVLV Switch -> LED Lit -> The output drive mode is selected for LV operation
QuadrantSelect -> LED Lit -> PI Drive aligned to UR or UL
HV ESD ON/OFF -> LED Lit -> Not in reset or toggle mode ie. nothing happening in reset land
Input Relay -> LED Lit -> Input quadrant drive signal is not connected to the HV ESD amplifier
PZ Bypass -> LED Lit ->  The associated Pole-Zero stage in the LV quadrant drive chain is bypassed

Cheryl, Nutsinee

07:00 Richard in and out number of times CER

08:17 Richard taking all SUS in HAM2 to SAFE. Fixing MC3 issue.

9:12 HAM2 SUS restored. IMC locking.

10:30 Jeff B. to cleaning area

10:45 Jeff back

11:50 Rick & Nutsinee to LVEA

12:06 Rick & Nutsinee back

12:33 Jeff K. restarts ETMY SUS

15:00 Elli to LVEA (HWS table)

16:00 Nutsinee to LVEA (HWS table)

18:20 Nutsinee & Elli out.

SUS ETMY is not happy today.

Nutsinee, Elli

We ahve aligned ITMY HWS so that it gets a sled return beam.  Attached is a photo from the HWS with no Hartmann plate on.   The alignment was done with the X-arm locked. The beam looks clipped, but we spent a few hours today looking for clipping in both the outgoing sled beam and in the incoming ALS beam and this is the cleanest image we could get.  We made sure both beams are centered on all optics.  I have put the Hartmann plate on the camera, so that we can try to get a measurement using the HWS camera.

On Monday & Tuesday the operator had to respond to many HEPI Pressure alarms.  They did not appear real to me as they seem to be glitches and steps in the pressure, things that really don't happen.  At the time I associated it with all the electronics changes EE was doing.  I surmised the powering off and on as things were replaced was causing ground state shifts on the pump station controller in turn changing the pressure transducers response or offsets.

Checked the HEPI Platforms and they were off during the pressure transients so it was not the platforms de-isolating or re-isolating.  We'd have seen this before if it was that.

Attached are a few trend plots, but nothing is definitive.

The first attachment is the corner station.  I'm plotting the return and supply pressures at BSC2, the difference between them for the servo set point.  The VOUT controls the motor/pump speed and the last trace is the MAINSMON, something to do with the building power supply.  A few glitches occurred before lunch.   But at 1325 it appears the Return Pressure droops more than Supply increasing the differential pressure and the servo drops the speed of the pump to keep the DP correct and this continues down and then back up in a series of steps.  Further after lunch more steps are seen.  Interesting to see the MAINSMON go flat for a few hours (the data is there) and then glitch back to looking live just as the final pressure jump puts everything back to normal at 1740 on Tuesday.

The second attachment is for EndY but showing you fewer channels and including the HPI OUTF to show that the platform isolation is not the cause.  This story for EndY is similar to the corner station except it is pretty much a single step in the pressures and motor speed.  Again, everything jumps back to normal when the MainsMon comes back alive, hmm at 1740pdt.

For EndX, this occurred on Monday.  The picture isn't as clear (3rd attachment,) the sensors are much noisier at EndX and the MainsMon came back on a couple times.  The first step also occurs about the time Ken the electrician is at EndX for access system work (alog 18496.)  There is also correlation at one occurrence of the MainsMon coming back alive.

Can't say exactly what was causing these pressure glitches but the pump station really responds to them and had the platform been isolating, it would have been seen on them as the true differential pressure across the HEPI Actuator would change.

Bottom line, when Richard tells you it won't bother you or it isn't his fault, grab your salt shaker!

Sudarshan, Kiwamu, Rich, Peter F, Jeff, Jim, Dave:

h1psliss was updated from Duncan's latest svn version, which makes the ODC channel an 32 bit unsigned interger DAQ data type (7)

[H1:PSL-ODC_CHANNEL_OUT_DQ]

acquire=3

datarate=16384

datatype=7

Model changes were made to h1susetmy and h1sustmsy.

The routing of the Duotone signal out of the last channel of the first DAC on h1iopsusey was turned off.

The DAQ was restarted to sync it back up the the PSL and SUS ETMY changes.

Filiberto, Peter, Jeff, Rich

Over the last few days, we have successfully installed the Low Noise ESD Driver (D1500129) and its associated field wiring.  This unit has 15 individual control lines:

4 bits are associated with switches to connect or disconnect the quadrant drive signals to the HV ESD amplifier that pass through the Low Noise Driver for control
4 bits are associated with switches to select or bypass the pole-zero stages in each quadrant drive path.
4 bits are used to select the output drive mode between High Voltage mode and Low Voltage mode for each quadrant.
2 bits are used to steer the two Parametric Instability (PI) drive inputs to any of the four available quadrants.
1 bit is used to enable or disable the High Voltage ESD amplifier

A wiring diagram for the entire ESD system is preliminarily available under D1400177-v4 pending the required DCN process.
Details of the Low Noise Driver circuitry are available under D1500129
The serial number of the installed chassis is S1500066.  The test results from manufacture are available at this serial number.
A test fixture has been supplied that allows manual operation of the low noise driver.  Details of the test fixture are available under D1500130

This afternoon, Jeff and I are planning to take detailed transfer functions of the driver for better filter compensation.  Jeff has also been working on the needed model updates and control screens.

Per Jeff Kissel's request Betsy and I (Xavi) looked at several SYS subsystem channels to perform timing checks on the IO chassis.

These checks were in slides by Shivaraj and the slides should be added to this alog and references to the slides added. 

The channels we looked at (shown in the attached green medm screen shot) are:

H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_1 (Master1)
H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_2 (Master2)
H1:SYS-TIMING_Y_FO_A_PORT_9_SLAVE_CFC_TIMEDIFF_1 (Y-arm)
H1:SYS-TIMING_X_FO_A_PORT_9_SLAVE_CFC_TIMEDIFF_1 (X-arm)

Two of them are in the Master, one in the y-arm, and the third in the x-arm. It does not appear that any other channels are active at this time.

We took a week of data (in the past of today) for each of these channels and attach figures that show the time series (to check for trends) as well as histograms.  

All in all these plots look reassuring. Notable features:

1) The timing differences between adjacent points are integer multiples of 7.45ns. Mostly the integer is 1 (see Master1TimeseriesDiff.jpg, only posted it for Master 1, others look the same).

2) There do not appear to be significant drifts (e.g. < 50ns for 1 week in Master 1)

3) The spread is about 50ns (shown in figures labeled Histograms)

4) there is ~1 day periodicity in the time series for Master 2

5)  There seem to be common glitches (small ones at the level of ~0.25 us, e.g. see all time series toward the end)

Betsy and Xavi