Displaying reports 71361-71380 of 83224.Go to page Start 3565 3566 3567 3568 3569 3570 3571 3572 3573 End

Reports until 16:54, Wednesday 04 June 2014

H1 AOS

Print this report.

thomas.vo@LIGO.ORG - posted 16:54, Wednesday 04 June 2014 (12216)

ITMY Calibration

Jeff Kissel, Thomas Vo

Jeff pointed out to me today in light of the RH test this past weekend that the ITMY optical lever gain is a factor of 2 different than the ITMX optical lever. We're inclined to trust the ITMX calibration because Keita made a pretty accurate measurement using the baffle PDs and the entire 4 km arm. I also remember specifically changing ITMX &ETMX gains to match Keita's measurement, but I don't remember doing ITMY/ETMY.

Anyway, Y-arm optical levers have to be checked once we get an arm again.

H1 AOS (ISC, SUS)

Print this report.

daniel.hoak@LIGO.ORG - posted 16:51, Wednesday 04 June 2014 (12215)

HAM6 work

Dan, Corey, Keita, Hugh, Jeff

Today we started the HAM6 installation procedure outlined in T1400385. After the north and south doors came off (and the east door was put back on), Hugh installed ISI ballast on the business end of the table while Corey checked cables. We found we were missing two cables, to carry the OMCR-QPD and AS-C-QPD signals from the brackets on the table to the flange (cables 4 and 10, in section 6 of the procedure). Also, we discovered a discrepancy between the flange layout document (D1002877) and the WHAM6 cable configuration (D1300122). The flange layout correctly assigns feedthrough D5-3C to the purge air, and the WFS head cables exit the chamber through D3-2C. According to the cable configuration the WFS head cables are going through the purge air feedthrough.

Another small discrepancy is the assignment of the OMC DCPD and PZT cables in bracket CB-1, on the top of the OMC suspension cage. The cables are swapped from the locations prescribed in D1300122; the DCPD cable is on the second floor, the PZT cable is on the first floor. (The connections at the flange are correct, so no worry of powering the DCPDs with the PZT drive.) We tried to correct the bracket arrangement but discovered that the PZT cable is too short to reach the second floor of the bracket, so we left things as we found them.

We found two spare cables with Betsy for the OMCR and AS QPDs and attached those to the flange and the brackets. The OMC suspension was moved flush against the cookie cutter, and we installed & torqued the dog clamps. (The dog clamps are the incorrect height, but this seems to be a systemic issue.)

Now that we have finished verifying the cable connections by eye, the next steps are (not necessarily in this order):

swap mirror M7 into a picomotor mount
arrange tip-tilts, mirrors, and lenses in the correct optical paths (to be aligned when we get beam)
install WFS and QPD sleds
flash diodes, check electronics
unlock the OMC SUS and check the OSEMs

We may need to switch between moving sleds/optics and installing ballast mass as we move through the procedure.

H1 SUS

Print this report.

betsy.weaver@LIGO.ORG - posted 16:05, Wednesday 04 June 2014 - last comment - 16:25, Tuesday 10 June 2014(12211)

H1 ITMx Deinstallation underway

(Betsy, Travis, Danny, Margot)

Today we (undid some work! - ha):

- Swung the ACB back with it's swing-away hardware

- Put a TFE cap on the TCS steering mirror right in the line of foot-traffic and floor removal for protection

- Removed the stiffening braces and wedges (and ~40 fasteners) from the ITMx QUAD

- Removed 3 of the floor panels and removed the sleeve stiffening structure from the QUAD

- Started disconnection of all top stage OSEMs and cabling to lower stage OSEMs on QUAD

- Staged the QUAD hanger hardware and elevator adapter parts

- Richard swapped out my dead backup PS for the elevator - thx, RM for promptness

- Collected the witness plates/samples from BSC 1 and cleaned flooring there

Images attached to this report

Comments related to this report

betsy.weaver@LIGO.ORG - 16:06, Wednesday 04 June 2014 (12212)

Jim apparently attempting to hang himself from a support tube:

Images attached to this comment

betsy.weaver@LIGO.ORG - 16:07, Wednesday 04 June 2014 (12213)

Travis breaking back - you can either see it or get an arm in there to adjust it, but you can't do both:

Images attached to this comment

betsy.weaver@LIGO.ORG - 16:25, Tuesday 10 June 2014 (12295)

Besides the sleeve and pile of larger parts removed from a QUAD during chamber de/installation (shown in picture above), following is a picture of all of the fasteners, nuts, etc that also get removed from the QUAD (the pan was empty when we started):

Images attached to this comment

H1 AOS

Print this report.

jim.warner@LIGO.ORG - posted 15:56, Wednesday 04 June 2014 (12210)

Ops summary

Kind of thin reporting, I was in and out a lot. TVo and Hugh were in the Control Room most of the day to cover, as well.

10:30 Betsy to ITMX 
10:45 I followed soon after 
14:30 JeffB Andres to HAM6 
15:12 Dave restarting DAQ

H1 DAQ (CDS)

Print this report.

david.barker@LIGO.ORG - posted 15:23, Wednesday 04 June 2014 (12208)

daq restart

15:12PDT. DAQ restart. To support h1isiham5 model change and add channels to the broadcaster for DMT.

H1 General

Print this report.

james.batch@LIGO.ORG - posted 13:41, Wednesday 04 June 2014 (12207)

Please DO NOT change the controls account settings for control room computers!

I have asked this before, but once again -

PLEASE DO NOT change the controls account settings!

This includes monitor backgrounds and keyboard layouts.

It affects every computer, not just yours, so DON'T DO IT!

H1 SUS

Print this report.

betsy.weaver@LIGO.ORG - posted 13:00, Wednesday 04 June 2014 (12206)

ITM deinstall status

Yesterday, the BSC installation arm was put on the BSC3 door. The annulus plumbing and the cable trays prevented the flange stiffener to be attached in the correct spot, so it was rotated 1 flange-hole down. The arm is in the appropriate place on the flange, however. The 5-axis lift table and QUAD elevator were then mounted on the arm.

This morning, Margot and Danny took swipe samples of some of the BSC3 chamber surfaces and then cleaned the floors. Jim locked the ISI (see his entry). Travis and I rearranged the furniture such that we can work efficiently and then plumbed in the electrical to the elevator in prep for starting deinstall this afternoon.

H1 CDS

Print this report.

david.barker@LIGO.ORG - posted 12:30, Wednesday 04 June 2014 (12205)

Model filter module file status

I have a script which reports if a model's filter file has been modified since last loaded, or was partially loaded (with the potential that other filters in the file have not been loaded). I'm thinking of running this at the end of every Tuesday maintenance to remind subsystem personnel if reloads are needed. Pending filter changes should be applied as soon as is possible, model restarts, power outages and RCG upgrades will load the latest filter files.

here is the output from the script for today

      h1isiham2: has modifed IIR file, investigate any prior loads
      h1isiham3: has modifed IIR file, investigate any prior loads
      h1isiitmy: has partial load, further investigation is required (last load was ITMY_ST1_T240SUBTRACT_Z Complete)
      h1hpiitmy: has partial load, further investigation is required (last load was ITMY_ISO_HP Complete)
      h1hpiitmx: has partial load, further investigation is required (last load was ITMX_SENSCOR_X_WNR Complete)
      h1susitmy: has partial load, further investigation is required (last load was ITMY_M0_LOCK_Y Complete)
        h1susbs: has modifed IIR file, investigate any prior loads
        h1tcscs: has partial load, further investigation is required (last load was ITMX_CO2_QPD_B_SEG3 Complete)
          h1lsc: has modifed IIR file, investigate any prior loads
          h1asc: has modifed IIR file, investigate any prior loads
       h1ascimc: has partial load, further investigation is required (last load was IMC_IM4_TRANS_SUM Complete)
      h1susetmy: has partial load, further investigation is required (last load was ETMY_L3_ESDOUTF_DACCT_UR Complete)
      h1susetmx: has modifed IIR file, investigate any prior loads
      h1hpietmx: has partial load, further investigation is required (last load was ETMX_ISO_VP Complete)

H1 INS

Print this report.

jim.warner@LIGO.ORG - posted 11:48, Wednesday 04 June 2014 (12204)

ITMX ISI is locked

Just finished locking ITMX. I remember this from last time, but just wanted to record some of the difficulties with locking the ISI's from below, in their current configuration. The ACB is VERY in the way (it's guaranteed I bumped it a few times), so I have to basically lean out over it a little (my spine does not make the proper S shape to make this easy) and Betsy's stool is a little too tall to slide under it. It would be a little easier if the current in-chamber stool was ~1 inch shorter, making it possible to slide under the ACB. The TCS mirror is also in the way, but it's manageable to work around, don't know if I touched it, I couldn't see because my head was jammed between the chamber side and St0 of the ISI.

H1 CDS

Print this report.

david.barker@LIGO.ORG - posted 11:17, Wednesday 04 June 2014 (12203)

new script to show model code SVN status

I have created a python script which shows the local SVN status for model code (mdl and c files used to build a model). It shows local mods and optionally shows any pending updates from the SVN repository.

The script is called reportTargetCodeStatus.py, give it -h or --help to show usage

david.barker@sysadmin0: reportTargetCodeStatus.py --help

site is lho

usage: reportTargetCodeStatus.py [-h] [--showpending] targetname

Report status of all source code files associated with a given front end

target

positional arguments:

targetname the target to be reported

optional arguments:

-h, --help show this help message and exit

--showpending show code updates which are pending from the SVN repo

(requires kerberos ticket to be open)

here is an example run with --showpending (needs a local kerb ticket for ligo.org authentication) on the h1iscey model

david.barker@sysadmin0: reportTargetCodeStatus.py --showpending h1iscey

site is lho

target: h1iscey

showpending Program will slow while contacting svn repostory

Model last compiled: Tue Jun 3 10:52:58 2014

Model compiled using RCG: /opt/rtcds/rtscore/advLigoRTS-2.8.3

source file last modified svn_st Updates?

isc/common/models/LSC_END.mdl Thu Nov 14 16:56:17 2013 - -

isc/common/models/STATECOMM.mdl Thu Nov 14 16:08:57 2013 - -

isc/h1/models/h1iscey.mdl Tue Apr 29 17:51:56 2014 - -

isc/common/models/FILTBANK_TRIGGER.mdl Thu Nov 14 14:58:37 2013 - -

cds/common/src/wait.c Thu Apr 25 13:34:28 2013 - -

isc/common/models/ASC_END.mdl Thu Nov 14 16:56:17 2013 - -

cds/common/models/SCHMITTTRIGGER.mdl Thu Nov 14 14:50:26 2013 - -

cds/common/models/FILTBANK_MASK.mdl Thu Nov 14 14:50:26 2013 - -

isc/common/models/LSC_TRIGGER.mdl Thu Nov 14 14:58:38 2013 - U

isc/common/models/QPD.mdl Tue Mar 4 09:42:07 2014 - -

isc/common/models/ALS_END.mdl Tue Apr 29 09:52:21 2014 - U

isc/common/models/WFS.mdl Wed Dec 11 19:13:12 2013 - -

isc/common/src/RtCommunication.c Thu Nov 14 13:19:02 2013 - -

H1 General

Print this report.

jeffrey.bartlett@LIGO.ORG - posted 11:03, Wednesday 04 June 2014 (12202)

Beer Garden 24 Hour Dust Plot

Plotted the dust trends for the past 24 hours (00:00 to 00:00)of dust monitor #5 in the Beer Garden. This cover the time period when the doors were removed from BSC1 and BSC3.

Non-image files attached to this report

BeerGardendust.pdf

H1 CDS (DAQ)

Print this report.

david.barker@LIGO.ORG - posted 08:15, Wednesday 04 June 2014 (12199)

CDS model and DAQ restart report, Tuesday 3rd June 2014

model restarts logged for Tue 03/Jun/2014
2014_06_03 10:58 h1iscey
2014_06_03 11:00 h1iscex
2014_06_03 15:52 h1sussr3
2014_06_03 15:54 h1sussrm
2014_06_03 15:55 h1isiham5
2014_06_03 16:19 h1isiham5

no unexpected restarts.

H1 ISC (ISC, SUS, TCS)

Print this report.

sheila.dwyer@LIGO.ORG - posted 09:41, Monday 02 June 2014 - last comment - 16:47, Wednesday 04 June 2014(12167)

alignment snapshot, ring heater changes alingment

Betsy, Sheila, Keita, Arnaud, Thomas

Here is a snap shots of the current alingment offsets. This alingment was checked quickly this morning, both of the arms are flashing green so the ITMs are within a urad or so of alinged.

We noticed that the ailngment of ITMY was off by about 8 urad in pitch from the saved offset, this seems to be because turning on and off the ring heater changes the ailngments. Attached are trends of the OpLevs durring the ring heater stress test this weekend, the itms moved by 2-5 urad in yaw, and both moved by about 30 urad in pitch. The third screenshot shows how the pitch changed as the ring heater power cycled.

Images attached to this report

Comments related to this report

jeffrey.kissel@LIGO.ORG - 09:50, Tuesday 03 June 2014 (12182)DetChar, SUS, TCS

@DetChar -- can you grab calibrated ASDs of the optical levers before and after the ring heaters are on full blast? It looks like they not only displace the optic in angle, but also add noise. It would be good to quantify this early, so we can fix it!

aidan.brooks@LIGO.ORG - 11:12, Tuesday 03 June 2014 (12184)

I forgot to check this. 

https://dcc.ligo.org/LIGO-T1100184
Phil Willems wrote a document (T1100184) that predicted around 0.9urad of pitch per Watt of RH power. We applied 27W of power, so the Spurious Willems Pitch is around 24urad. This seems consistent with what was seen. It's worth a more detailed look though.

I can't explain the 8urad offset between the start and finish.

laura.nuttall@LIGO.ORG - 14:37, Tuesday 03 June 2014 (12190)

From Jeff's request I've taken a look at the Oplevs before, during and after the heaters were on and found their ASDs (1st plot). These ADSs are taken over 10 minutes and the times are noted in the legend. I specifically chose times where the ITMY ISI ODC is reporting a good state. In addition the BLRMs look normal and similar for all three times. I also found the ground motion ASDs for these times (2nd plot) to reconfirm the ground motion is similar for all three times. 

Conclusion - the ASDs for the Oplevs look very similar before, during and after the heaters are on; they don't appear to add extra noise. There is perhaps an extra peak between 7-8Hz in the YAW when the heaters are on but other than that nothing stands out.

Images attached to this comment

shivaraj.kandhasamy@LIGO.ORG - 21:15, Tuesday 03 June 2014 (12197)

There is also a DC power level difference between states before after the weekend stress test. Based on the channel H1:TCS-C_RH_Y_LOWERCURRENT and Aidan's note of 27 W in the ramp up state, the forementioned DC offset correspond to a power level difference of ~8 W (assuming 0.55 for the current level during stress test and 0.3 before the stress test and 0 after the stress test, obtained from the plot of H1:TCS-C_RH_Y_LOWERCURRENT; 27 * 0.3^2/0.55^2). From the dcc documnet noted in the Aidan's comment this correspond to ~8 urd difference we between the initial and end states. This also means that we probably have to make new reference with the current setting (of zero current), if desired.

daniel.sigg@LIGO.ORG - 07:26, Wednesday 04 June 2014 (12198)

The ITMY ring heater was set to 8W during the past commissioning period to correct for the fact that we had an ETM with ITM coating installed. This will be changed in the current installation phase. New references will be rquired when we have the new optics installed and aligned.

betsy.weaver@LIGO.ORG - 09:15, Wednesday 04 June 2014 (12200)

Also note, the ITMs that this ring heater test was performed on are hung from metal wires in stead of glass fibers. I wonder if this is what is making them more susceptible to steering errors when the ring heater is engaged... The current install is to swap these ITMs out for new units complete with glass fibers. Hopefully the ITMs won't be as susceptible to mispointing when on fibers if this is the case.

jeffrey.kissel@LIGO.ORG - 15:58, Wednesday 04 June 2014 (12209)COC, DetChar, ISC, SUS, SYS

J. Kissel

As Betsy indicates these ITMs are suspended via steel wire instead of fused silica fiber. This plays a difference in the compliance used in the Phil's calculation of the expected displacement in T1100184.

Also, the Willems calculation uses a QUAD suspension model from T1000263 which is an out-dated model parameter set that was never confirmed against real measurements (which we now have).  Also it's unclear which Stage / DOF to Stage / DOF was used to produce the "pitch coupling" of 0.154 [rad/Nm]. The mathematica notebook that is "available from the author" is regrettably *not* zipped up in the "Other Files" on the DCC card, so I can't confirm. The attached .pdf doesn't have the 0.154 anywhere in the document.

However, assuming the compliance he used was pitch displacement of the test mass from pitch torque on the test mass, the values from the production quad model model (now confirmed against measurement) are
Fiber: 0.141 [rad/N.m] (using the quadopt_fiber.m parameter set)
Wire: 0.105 [rad/N.m] (using the quadopt_wirerehang.m parameter set)
Willems quotes the displacement of the Center of Mass (CoM) as 1.47e-7 [m] for 11 [W] of ring heater power. Assuming the displacement is linear with ring-heater power (safe assumption??), that's
1.34e-8 [rad/W]
The displacement one expects per Watt of Ring heater power from the Willems model of a displaced CoM is then
Fiber:  1.34e-8 [m/W] * 40 [kg] * 9.8 [m/s^2] * 0.141 [rad/N.m] =  7.4064e-07 [rad/W] = 0.74 [urad/W]
Wire:   1.34e-8 [m/W] * 40 [kg] * 9.8 [m/s^2] * 0.105 [rad/N.m] =  5.5154e-07 [rad/W] = 0.55 [urad/W]

And therefore at max power of 27 [W], the ITMs should be displaced by
Wire: 5.5154e-07 [rad/W] * 27 [W] = 1.4892e-05 [rad] = 15 [urad].

This is a factor of two less than what is seen in ITMX Pitch (the cleanest example). For ITMY, I don't think the test mass was allowed to reach equilibrium before the ring heater's power was changed during the power cycling, so it's more difficult to assess the displacement -- but I think it's much closer to 15 [urad] judging by when the test was turned off (presumably it was turned off to zero current, and not the equivalent of 8 [W] that it had been set to as Daniel indicates).

thomas.vo@LIGO.ORG - 16:47, Wednesday 04 June 2014 (12214)

Jeff pointed out that the factor of two in the ring heater deviation could arise from the optical lever gain in ITMY being a factor of two smaller than ITMX. We trust the ITMX's optical lever calibration because its gain was measured using the baffle PDs and the entire 4km arm (noted in ALOG 10331) but it doesn't look like a similar procedure was done for ITMY, or at least we couldn't find an ALOG that indicated as such.

H1 ISC (ISC)

Print this report.

corey.gray@LIGO.ORG - posted 13:53, Thursday 29 May 2014 - last comment - 09:24, Wednesday 04 June 2014(12110)

HAM6 QPD Sled Notes

Dan H. completed setting up of the HAM6 QPD sled yesterday. With he & Keita both happy with the Dan's mode matching measurements, the Sled wrapped up and bagged. Before doing this, positions of optics were measured (with a ruler +/- 1mm). Here are distances measured:

133mm: Edge of Sled -> L201 (center of lens mount)
223mm: L201 -> L202
41mm: L202 -> M203 (front surface)
88mm: M203 -> QPD1
111mm: M203 -> M202
63mm: M202 -> M201
282mm: M201 -> QPD2

Photos of the HAM6 QPD Sled are located here.

The WFS Sled, QPD Sled, Fast Shutter Beam Dump, and a bag of hardware/dog clamps are all in totes in the Optics Lab and ready to be payloaded on HAM6 (most likely early next week?).

NOTE: Still missing the Fast Shutter! Still being designed/manufactured??

Images attached to this report

Comments related to this report

daniel.hoak@LIGO.ORG - 09:24, Wednesday 04 June 2014 (12201)

A document describing the mode-matching procedure is in the DCC: T1400370.

Displaying reports 71361-71380 of 83224.Go to page Start 3565 3566 3567 3568 3569 3570 3571 3572 3573 End