Upon Jeff's recommendation I made a new set of blend filters for HAM-ISI that feature:

• The eLigo high roll off blend filters on RX and RY, to limit vertical GS13 noise injection in low frequencies. 
• Unchanged blend filters along the other degrees of freedom.

I installed those filters on HAM3-ISI and compared the isolation performance with what we had before. Plots are attached.  

The new set of blend filters help us meeting the requirements below 1Hz, while still keeping motion within requirements above.

Those blend filters are currently installed in the filter bank 9, as "R_eLigo"

The Script I made to create those blend filters is commited under the the SVN (r7461):   /svn/seismic/HAM-ISI/Common/Blend_filters/makeHAMISIBlendFilters_Hybrid.m
The resulting set of filters is commited under the SVN (r7462):                                         /svn/seismic/HAM-ISI/Common/Blend_filters/Filters_HAMISI_Blend_Hybrid_24_Jul_2013.mat

What follows are the VxWorks version and boot parameters for all of the vacuum VME crates as of 24Jul2013. This is for posterity/future reference if needed.



-- h0vemr:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Apr 2 10:48:41 PST 1999.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-333-8M/vxWorks e=10.1.0.63:ffff0000 h=10.1.0.2 u=barker tn=h0vemr s=/cvs/cds/lho/target/h0vemr/startup.cmd
value = 165 = 0xa5
h0vemr > 


-- h0velx:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.62:ffff0000 h=10.1.0.2 u=barker tn=h0velx s=/cvs/cds/lho/target/h0velx/startup.cmd
value = 166 = 0xa6
h0velx > 


--h0vemx:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.61:ffff0000 h=10.1.0.2 u=barker tn=h0vemx s=/cvs/cds/lho/target/h0vemx/startup.cmd
value = 166 = 0xa6
h0vemx > 


--h0veex:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.60:ffff0000 h=10.1.0.2 u=barker tn=h0veex s=/cvs/cds/lho/target/h0veex/startup.cmd
value = 166 = 0xa6
h0veex > 


--h0vely:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.64:ffff0000 h=10.1.0.2 u=barker tn=h0vely s=/cvs/cds/lho/target/h0vely/startup.cmd
value = 166 = 0xa6
h0vely > 


--h0vemy:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.65:ffff0000 h=10.1.0.2 u=barker tn=h0vemy s=/cvs/cds/lho/target/h0vemy/startup.cmd
value = 166 = 0xa6
h0vemy > 


--h0veey:

VxWorks (for Motorola MVME162LX) version 5.2.
Kernel: WIND version 2.4.
Made on Fri Aug 18 15:16:20 PDT 2000.
Boot line:
ei(0,0)hanford1:/opt/CDS/b/vw/5.2/config/mv162-262-16M/vxWorks e=10.1.0.66:ffff0000 h=10.1.0.2 u=barker tn=h0veey s=/cvs/cds/lho/target/h0veey/startup.cmd
value = 166 = 0xa6
h0veey > 

[Alexa and Kiwamu]

 We became unable to lock the reference cavity this morning. The autolocker wasn't capturing a fringe. After some investigation and fiddling some parameters it started locking.

There was an oscillation which seemed preventing the FSS from a stable lock. In the end the oscillation somehow went away.

• What we did:
  • We changed the temperature scanning range and its sweep speed
    • Neither narrowing nor expanding the range helped
  • We decreased the transmitted light threshold from 1 to 0.5 with a hope that this gives an earlier trigger for a fringe
    • No improvements found.
  • We increased the oscillation threshold from 0.5 to 2.0 because we saw the fast feedback hits this threshold.
    • No improvements
  • We switched the system to a manual mode by toggling the button for the autolocker in the FSS medm screen
    • We manually set the temperature to be 0.1359 [K]. This is where we found the zero-zero mode.
    • We diabled the active temperature feedback by disabling the input of H1:PSL-FSS_TEMP_LOOP
    • Once we reached the point close to the resonance we toggled on the fast loop.
  • The FSS was found to be oscillating.
    • We were still in the manual mode at this point
    • In H1:PSL-FSS_FAST_MON_OUTPUT display we could see that the voltage fully swung +/- 10 V. We didn't check the oscillation frequency.
  • We toggled the noise eater (see Rick's alog).
    • No difference was observed.
  • We decreased the common gain by 19 dB to see if the oscillation is due to a control issue.
    • The oscillation disappeared.
    • H1:PSL-FSS_COMMON_GAIN was 8 dB
  • We set the common gain back to the nominal
    • Strangely we didn't see the oscillation any more
    • H1:PSL-FSS_COMMON_GAIN was 27 dB which is nominal
    • So the oscillation was fixed somehow
  • We switched it to the autolocker mode and restored the parameters which we changed.
    • It has been locking and fine so far.

Mark, Arnaud, Dave

We power cycled h1susb123 and its IO Chassis as part of the BS noise investigation.

To correct IPC errors at EX, the h1susex, h1iscex, and h1seiex front-ends were powered off, the Dolphin cables were moved to the right side ports, and the computers restarted.  Models started OK, IPC errors were cleared with diagnostic reset.

Yesterday, Gerardo bonded on the 1st prism to the LLO destined PUM.  He used the new procedure which incorporateed adding borosilicate glass beads to space the glue joint more appropriately.  He intends to proceed today with gluing in the magnet/flag discs and then the 2nd prism today/tomorrow.

After much anticipation, we finally receive a pair of bought Ag-coated mirrors from Newport.  Within seconds we were able to tell these guys were much better ("order(s) of magnitude better", says Keita) than any other TMS mirrors used for LIGO.

One of them only had a few "spots" which could be seen from the front with light behind it.  And this one had no "cloudiness" observed with many other mirrors.  The second mirror had minor cloudiness (but they "cleared up"?), and this one had virtually NO holes in it.  

Both were cleaned and we took out to EX TMS Lab.  We removed the Alignment mirror serving as an F1 Mirror and upon installing the new Newport mirror, Keita noticed that these mirrors are thinner (!).  They are probably a couple millimeters thinner than the original mirrors.  We were able to accomodate the mirrors by screwing the pitch/yaw actuators out a little more.  New mirror was installed and this is where we stopped for the day.

I would have liked to install the tons of pictures we took, but RESOURCE SPACE HAS BEEN DOWN!!!  (all afternoon and evening)  :(

Attached to this entry are a sample of photos.

Mitchell Robinson, Scott Shankle, Thomas Vo -

Arm Cavity Baffle Suspension Assembly is complete and ready to suspend.
Baffle Box assembly is in process.

-----------------------------------------------

Mitchell Robinson, Scott Shankle, Apollo's Randy and Scott -

All participants reviewed the Installation Procedure and the Hazard Analysis.
The Manifold Cryopump Baffle was brought down from the Balancing Fixture.
The Flange Protectors and Baffle Alignment Tooling were attached to the spool.
Yet, this baffle continues to be a complete pain in the derriere -
the newly fabricated Spacer/Shim's holes are too small.
Team will be looking into the feasibility of a clean modification.

----------------------------------

For the DetCharians: as of
1058670016
July 23 2013 20:00 PDT
Jul 24 2013 03:00:00 UTC
we are leaving the IFO in the following configuration:

Input Mode Cleaner: LOCKED (offload to MC2 stages M2 and M2 only, under slow WFS control)
Green Arm: LOCKED (no offload to HEPI)

HAM2 & HAM3 HEPI: Floating, with offsets, but no control
HAM2 & HAM3 ISI: Level 2 isolated
All HSTS SUS: Level 1.5 "resg" damping filters filter
PR3: Level 1.0 damping filters

ITM HEPI: Locked
ITM ISI: Level 2 isolated
ITM QUAD: Level 2.1 damped

BS HEPI: Level 2 isolated 
BS ISI: Level 2 isolated, but had to diable GS13 watchdogs while isolating to get it up and running
BS Triple: Level 2.0 damping filters

ETM HEPI: Level 2 isolated
ETM ISI: Level 2 isolated
ETM QUAD: Level 2.1 damped

May it stay locked all night!
The calibrated channel for green is H1:ALS-Y_REFL_CTRL_OUT_DQ, in [Hz] (so multiply by lambda*(L/c) to get [m])
The calibrated channels for the IMC are 
IMC_L = H1:IMC-X_DQ in [m]
IMC_F = H1:IMC-F_OUT_DQ in [m]

[Jeff K., Kiwamu]

We took a look at the IMC locking after Hugo was done (alog 7189).

The tranmitted light still reaches 2300 counts at H1:IMC-MC2_TRANS_SUM_OUTPUT wihtout tweaking alignment which is good even though the WFS is not engaged.

HAM2 and HAM3 HEPI were released today.

Raw IPS readouts were recorded prior to release. The following offests were set in the actuation path to reestablish alignment, based on the IPS readouts:

IPS readouts were recorded after reestablishing alignment:

The Before/After difference in IPS readout is shown below:

The remaining shift in alignment induced by unlocking HAM2 and HAM3 HEPI is less than 0.25mils (147 counts on the IPS), on each pier, after reestablishing the alignent with offsets on the actuation path.

Vented spool (in place of iLIGO BSC5) annuli -> No inner O-ring leakage -> removed temporary O-ring valves from bolted joint pump ports and connected permanent ion pump piping -> pumping annulus system with aux. cart overnight

For future reference,

The calibrated channel representing the frequency of the green laser (in [Hz]) is
H1:ALS-Y_REFL_CTRL_OUT_DQ


This can be converted to the length of the arm cavity using the free spectral range,
Cavity Length = lambda * (L / c) * H1:ALS-Y_REFL_CTRL_OUT_DQ

GregG unlocked these suspensions and they are now floating again after a long hiatus of sequestration.  Please regard the "Unlocked" signs and be mindful of any mechanical shorts against the floating elements.  If you drop a screw or other smaller item, don't just forget about it as it may short the suspension too.
Please avoid stepping on the Crossbeams if you don't wish to hear about it from BetsyW!

The demodulation phase of the IMC rotated by approximately 90 degrees. This is the third time to see this kind of phase rotation in the IMC. Very strange.

• A brief history of phase rotation
  • 1st  2013.July.16 (alog 7108)
  • 2nd 2013.July.17 (alog 7119)
  • 3rd  2013 July.23 (NEW !!)

Temporary fix:

Temporarily I switched the signal from the I to Q signal by changing the actual cabling at the corner field rack and flipped the control sign at H1:IMC-REFL_SERVO_IN1POL by toggling the switch in the upper left of the IMC board screen. The IMC is now locking and should serve as an interferometric monitor for the sus and seismic people. The WFS loops are currently disabled by setting H1:IMC-WFS_GAIN to be zero to avoid a meaningless control. It seems the IMC started dropping its lock after Roberts and his company entered the PSL enclosure. The temperature transient somehow caused it ? It is unclear.

By the way the attached is a picture of the current I-mon and Q-mon signals in a X-Y projection. The I-mon is x-axis and Q-mon is y-axis. You can see a line almost in parallel to the y-axis indicating that the IMC length signal shows up mostly in the Q-phase.

The dust monitors in the LVEA are NOT currently being recorded. It appears swapping the dust monitor in the H1 PSL enclosure has broken the communications.