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Reports until 20:39, Monday 03 June 2013
H1 ISC
daniel.sigg@LIGO.ORG - posted 20:39, Monday 03 June 2013 (6608)
ALS Laser power
As almost reported here the diode current was increased by about 25%. But, remember that adjusting the didoe current also changes the laser frequency! Today we had to adjust the PZT temperature by 11GHz to get the beat note with the PSL back. This corresponds to 2 mode hopes (5GHz per mode hope). We then compensated for this offset by decreasing the front panel temperature potentiometer by 1.40 units. It is about 3K or 3V per mode hope.

We also noticed that the clamp LED was on. This means the internal current limit is engaged. The manual recommends to back-off the diode current by 50mA.
LHO General
patrick.thomas@LIGO.ORG - posted 19:02, Monday 03 June 2013 (6606)
plots of dust counts
Attached are plots of dust counts requested from 5 PM June 2 to 5 PM June 3.

The dust monitor at location 14 in the LVEA (H2 PSL enclosure) is indicating a calibration failure.

The dust monitor at location 8 in the LVEA (in the small clean room between HAM 2 and HAM 3) has been indicating for a while that this clean room is not clean.
This could be because the prefilter on one of the fan filter units is not in place: alog 6375
Non-image files attached to this report
H1 ISC
jaclyn.sanders@LIGO.ORG - posted 18:17, Monday 03 June 2013 - last comment - 20:41, Monday 03 June 2013(6605)
Fringing observed in arm cavity, still attempting lock

(Jax, Alexa, Stefan, Daniel)

The PLL had completely lost its beat note after the PSL problems last week. We found the beat note again and adjusted the temperature at the laser to account for this.

After the PLL locked again, fringing was observed in the arm cavity. Locking is still a work in progress.

During the locking process it was noted that the local oscillator monitor channel (H1:ALS-Y_REFL_A_DEMOD_LOMON) was showing -22 dBm, which was nominally 13 dBm. At the end station, we used an oscilliscope to verify that the input to the system was quite small (~11 mV pp). This was fixed by tightening cables in the RF distribution path.

At this time the channel reads 22 dBm, but measurements with oscilliscopes give 11 dBm, consistent with the nominal input to the demod board. The calibration will probably have to be adjusted.

Still no lock. :( 

Comments related to this report
stefan.ballmer@LIGO.ORG - 18:50, Monday 03 June 2013 (6607)
We also noticed that having the mode cleaner locked actually INCREASED the fringing in the arm. Right now there seems to be simply too much arm/frequency motion. Also, the maximum pdh gain is limited by what the PLL loop can handle.
daniel.sigg@LIGO.ORG - 20:41, Monday 03 June 2013 (6609)
Maybe this is a fluke? The fiber sample is taken after the reference cavity and should be unaffected by the IMC feedback path.
H1 SEI
vincent.lhuillier@LIGO.ORG - posted 17:53, Monday 03 June 2013 (6604)
SEI-BSC3 - ITMX

The ISI (BSC3-ITMX) was tested with the dummy payload. Everything looks good. Report can be found at E1100848-V1 - aLIGO ISI-BSC3- Phase II report.pdf.

H1 SUS
arnaud.pele@LIGO.ORG - posted 17:45, Monday 03 June 2013 (6602)
ITMY Phase 3b transfer functions

ITMY M0 to M0 and R0 to R0 transfer functions have been running over the weekend for phase 3b testing

The attached documents are showing comparisons between :

Most of the transfer functions are in good agreeement with model and previous measurements. Similarly to Mark's comment for phase 3a testing on aLog 5304, there's a discontinuity at 0.4Hz on the main chain TF in vertical and roll (page 3 and 4 of first pdf), probably due to a measurement artifact. A dtt measurement will be needed to confirm it.

scripts and data have been commited to the svn

Non-image files attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 16:51, Monday 03 June 2013 (6603)
WBSC1 HEPI Actuators in RUN; IPSs zero'd
Per WP3934, I put the BSC1 HEPI Actuators in Run or Operational Mode.  This entails closing the Fluid Return and Supply lines at the chamber, closing all the bleed valves on the Actuators and then opening the exit valve for the wheatstone bridge.  This is the operational state for the HEPI Actuators.  I saw a 2 to 4 mil drop of the IPS readout for the vertical actuator when the supply & return valves were closed (pressure drop at Actuators).  The Horizontal actuators 'retracted' about 1/2 to 2/3 mil.  These moves did not come back when the pressure was returned.  The Crossbeam Foot is locked and these numbers may recover at that time, we'll see.
We'll stay in this state for a day and when permissible, unlock the Crossbeam Foots and continue with commissioning.
LHO General
patrick.thomas@LIGO.ORG - posted 16:15, Monday 03 June 2013 (6600)
Ops Afternoon Summary
I took over for Justin in the early afternoon.

Cheryl to end X transmon lab
Corey to squeezer bay to work on table enclosure
Hugh to switch HEPI actuators at BSC1 to Run Mode
Cheryl to end Y transmon lab
LHO General
patrick.thomas@LIGO.ORG - posted 16:14, Monday 03 June 2013 (6601)
dust monitor in H1 PSL diode room
I started the new IOC for the dust monitor in the H1 PSL diode room. It is running but the data is not being acquired into the frames yet.
H1 SUS
kiwamu.izumi@LIGO.ORG - posted 13:37, Monday 03 June 2013 (6599)
Unknown offset applied on MC1_M1_T1 coil

[Mark, Arnaud, Hugo, Cheryl, Kiwamu]

Here is our understanding of what happened on the MC1 suspension in this past Friday (alog 6591) although it is still unclear why there was a big offset in the T1 coil.

(1) Suddenly a big offset (-10 k counts ) showed up in the T1 coil (VOLTMON) which wasn't requested from the MC1 suspension model (DAC_OUTPUT_0_0).

(2) The M1 stage was pushed by ~ 10 k counts in OSEMINF_T1_INMON due to the offset. This was visible in the IMC-REFL_DC camera when I was in the control room.

(3) The DC change in the M1 stage then triggered the IOP DAC _KILL because the DC value hit the threshold of 10,000 counts.

(4) Tripping the DAC KILL somehow disabled the unknown offset too and hence it released the M1 stage with a big kick. Consequently an undamped oscillation was observed.

After this every time I untripped the watchdogs, the unknown offset persisted and kept tripping it.

Images attached to this report
H1 AOS
cheryl.vorvick@LIGO.ORG - posted 13:09, Monday 03 June 2013 (6598)
Oplev inspection - late entry from Friday
Thomas and I looked at 3 different optical lever setups in the LVEA.  These are oplevs that are already installed and working.  I believe we looked at  the oplevs for PR3, HAM2, and ITMY.  My goal was to see the hardware as it looks installed on a real IFO.  I would recommend we look at ways to rework the housing for access to the hardware.
LHO VE
kyle.ryan@LIGO.ORG - posted 11:24, Monday 03 June 2013 (6597)
Opened GV5, valved-out YBM MTP and opened GV18 (at the request of others).


			
			
H1 SEI
vincent.lhuillier@LIGO.ORG - posted 10:21, Monday 03 June 2013 (6595)
BSCs status for HIFO Y

Here is the status of the BSCs for HIFO-Y

HEPI - BSC6:
- HEPI unlocked
- HEPI pump running with the new servo pump controller
- Control loops for position control 100mHz & 5Hz - Currently (since May 30, 2013) controlled in position (UGF: 100mHz), for ISC work.
- Blend filters at 800mHz + control loops 10Hz + Sensor correction

ISI - BSC6 (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=6391):
- Damping filters installed
- Blend filters at 250mHz - 750mHz both stages with T240 on stage 1
- Isolation filters Level 1 installed: UGF-15Hz
- Isolation filters Level 2 installed: UGF-25Hz
- Isolation filters Level 3 installed: UGF-40Hz stage 1 + UGF-32Hz stage 2
- Sensor correction both stages (STS-2 to stage 1 and T240s to stage 2 - No HEPI-L4C & STS-2 blend not implemented for the moment)
- Feedforward HEPI to stage 1 needs to be re-installed (worked few months ago)

HEPI - BSC1:
- HEPI locked
- Actuators bleeding

HEPI - BSC2:
- HEPI locked
- Actuators bleeding

ISI - BSC1 (Waiting for HEPI to be in a running state to go further - HEPI Locked -> Resonances seen by ISI):
- Damping filters installed
- Blend filters at 250mHz - 750mHz both stages with T240 on stage 1
- Isolation filters Level 1: 15Hz

ISI - BSC2 (Waiting for HEPI to be in a running state to go further- HEPI Locked -> Resonances seen by ISI):
- Damping filters installed
- Blend filters at 250mHz - 750mHz both stages with T240 on stage 1
- Isolation filters Level 1: 15Hz

Ground Instruments
- STS-2 at EY hooked up
- STS-2 in the beer garden hooked up
- STS-2 of the input and output arms on site but not hooked up

Models ISI: All ISI models are ready for the sensor correction with HEPI-L4C - STS-2 blend but they don't have the cartesian "smooth steering" capability yet.

H1 SEI
hugo.paris@LIGO.ORG - posted 10:11, Monday 03 June 2013 (6594)
HAM Status

Here is the current status of the aLIGO SEI work regarding the HAM chambers. Everything in bold is to be completed for HIFO-Y. Everything in red is a change from last week's status. Everything in green is available.

 

·         HAM 1

o    HEPI: To be commissioned, currently locked
       Electronics and cables ready

 

·         HAM2

o   ISI: previously commissioned with HEPI locked (recent performance spectra), currently unlocked, in vacuum

o   HEPI: to be commissioned, currently locked, models and electronics ready. Commissioning could starts once the IMC locks again.

·         HAM 3

o   ISI: previously commissioned with HEPI locked (recent performance spectra), currently unlocked, in vacuum

o   HEPI: To be commissioned, currently locked, model and electronics ready. Commissioning could start once the IMC locks again.

·         HAM 4 

o   ISI: In chamber, Previously tested during assembly validation, currently locked, no suspension installed, in-vac cables not connected, chamber temporarily closed.
     Electronics ready, in field cables ready, in-rack cables 90%

o   HEPI: Currently locked, to be commissioned
     Electronics ready, in field cables ready, in-rack cables 90%

·         HAM 5

o   ISI: In Chamber, Previously tested during assembly validation, currently locked, no suspension installed, in-vac cables not connected, chamber temporarily closed.         
    Electronics ready, in field cables ready, in-rack cables 90%

o   HEPI: Currently locked, to be commissioned     
     Electronics ready, in field cables ready, in-rack cables 90%

·         HAM 6

o   ISI: in a container. Need to be retrofitted with aLIGO censors (GS13, CPS) and to receive a new set of Actuator Cables. Cables and inertial sensors will be tested prior to installation. All this will happen chamber-side prior to installation in chamber. Commissioning will follow.
    Electronics and cables started, the rest is ordered

o   HEPI: Currently locked, to be commissioned
     Electronics ready, in-rack cables 90%

H1 IOO
kiwamu.izumi@LIGO.ORG - posted 06:24, Saturday 01 June 2013 - last comment - 12:35, Saturday 01 June 2013(6591)
WFS commissioning : (1) demod phase re-adjusted again (2) MC1 keeps tripping

There was not so much progress on the IMC WFS commissioning yesterday.sad

From the late evening MC1 started tripping for some reason and this prevents the IMC from locking stably. I made a contact with Arnaud and Mark.

Besides, I re-adjusted the demod phases of WFS_A and WFS_B again. This time I rotated the phase of some of the segments by 180 deg such that all of them shows the same sign in the error signal of the IMC length. This resulted in a more sensible response in WFS_A (e.g. shaking pitch of MC2 gives pitch signals in WFS-A). I didn't get a chance to look into WFS_B yet.

Comments related to this report
mark.barton@LIGO.ORG - 12:35, Saturday 01 June 2013 (6592)

I logged in remotely about 10:30 am and took a look. The suspension was quiet and the alignment offsets were off. All three levels of watchdog were tripped.

I reset the watchdogs with the damping enabled, and it tripped after a few 10s of seconds with much excitation on the OSEMs as if something had been ringing up. The OSEM AC Band Limited path had tripped and there was lots of excitation on the OSEMs (up to ±10000 counts).

I reset the watchdogs again with just the L damping enabled and got the same results.

I turned off the damping entirely and reset the watchdogs, again and after a short time it tripped again, even though no actuation had been going out.

I turned the damping back on and reset the watchdogs while carefully oberving the OSEM inputs and the DC and AC band limited signals. The damping effectively quieted the signals but again after a minute or two things suddenly went crazy as if the suspension had been knocked.

Finally I reset the watchdogs with damping one last time and it's stayed damped for the last hour. So I don't doubt there was a problem but I'm not sure what it was. The HAM2 ISI and HEPI watchdogs were tripped when I checkeda bout halfway through. The MC3 WD was not tripped.

LHO VE
kyle.ryan@LIGO.ORG - posted 17:16, Friday 31 May 2013 - last comment - 10:01, Sunday 02 June 2013(6586)
Soft-closed GV5 (10-15 psi), Soft-closed GV18 (414 seconds) -> for viewport work by others
After 45 minutes or so, GV5 "cammed" closed -> As such, I went ahead and valved-in the YBM MTP for the weekend.  

For future reference;  use 5-10 psi for GV5 soft close instead of 10-15 psi (each pneumatic valve is unique, observed range varies between 15-25 psi to cam close)
Comments related to this report
kyle.ryan@LIGO.ORG - 10:01, Sunday 02 June 2013 (6593)
Correction -> 4 minutes and 14 seconds not "414 seconds" as listed above. 

Also, 80K pump pressure may indicated that GV18's gate may not be in full contact with its O-rings?  Should have actuated valve motor for a few more seconds for effective soft-close?
LHO General
patrick.thomas@LIGO.ORG - posted 18:57, Thursday 30 May 2013 - last comment - 19:02, Friday 31 May 2013(6577)
plots of dust counts
Attached are plots of dust counts requested from 5 PM May 28 to 5 PM May 29.
Non-image files attached to this report
Comments related to this report
patrick.thomas@LIGO.ORG - 19:02, Friday 31 May 2013 (6589)
The dust monitor at location 14 in the LVEA (H2 PSL enclosure) is indicating a calibration failure.
LHO General
patrick.thomas@LIGO.ORG - posted 18:53, Thursday 30 May 2013 - last comment - 19:02, Friday 31 May 2013(6576)
plots of dust counts
Attached are plots of dust counts requested from 5 PM May 29 to 5 PM May 30.
Non-image files attached to this report
Comments related to this report
patrick.thomas@LIGO.ORG - 19:02, Friday 31 May 2013 (6590)
The dust monitor at location 14 in the LVEA (H2 PSL enclosure) is indicating a calibration failure.
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