Displaying reports 67681-67700 of 83068.Go to page Start 3381 3382 3383 3384 3385 3386 3387 3388 3389 End
Reports until 16:19, Tuesday 23 December 2014
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 16:19, Tuesday 23 December 2014 (15817)
CDS Maintenance Summary

ISC end station upgrade RCG2.8.7:Rolf, Daniel, Jim, Dave

Rolf released the EXC code fix as RCG tag-2.8.7. The fix was tested yesterday on the DTS using Daniel's new Integrator Filter Module parts (IFM). Today I installed tag-2.8.7 on H1 and set the release/ pointers to refer to it. Daniel performed model cleanup and bug fixing of h1iscex and h1iscey during the morning, building against 2.8.7. We restarted these models several times today, with attendent DAQ restarts. After the final code change and restart, I repointed the release/ pointers back to RCG-2.8.5.

Daniel confirms the new RCG fixes the EXC and TP problems he was seeing with the IFM parts in the ISC end station models. This closes WP #4984

Power Down h1susquadtst: Jim, Dave

I took the h1susquadtst models out of the DAQ and we powered the front end down. Unfortunately this caused DAQ data errors for many front end systems for several minutes (susauxb123, lsc, asc, oaf in the corner station. all models in the mid and end stations). We tried a streamers restart on an end station sus model, which did not do anything. We then powered h1susquadtst back on and all the errors went away. I had forgotten to remove this system from the rtsystab file which may have caused the problem. After removing from both the DAQ and rtsystab, this time we issued a powerdown command and the DAQ problems were not repeated. To complete the power down of the LVEA test racks, all DC power supplies were powered off, as were the network switches. All power cords were removed from the FE computers.

EX Beckhoff h1ecatx1, Tuesday Freeze Up: Daniel, Dave

The EX Beckhoff system froze up at 13:50 PST. A repeat of its periodic Tuesday problems. Daniel restarted the system, but reported an unclean EPICS IOC startup (started too fast). Both conlog and the DAQ EDCU showed problems reconnecting to many h1ecatx1 channels. The problem was resolved after the EPICS gateway h1slow-h1fe was restarted, but even then it took about 10 minutes for conlog and EDCU to complete the reconnection in fits and starts.

Conlog reconfiguration: Dave

Following the ISC code changes, I reconfigured conlog. Later when conlog was not reconnecting to h1ecatx1, I added conlog's own epics channels to conlog to force a reconfiguration to hopefully permit a reconnection (this did not work, the epics gateway restart was the actual fix).

Partial and Modified-but-not-loaded Filter Module Files Loaded onto Front Ends: Jim, Dave

We performed the Tuesday reload of filter module files which had either been partially loaded or modified and not loaded over the course of the past week.

Modified files which were not loaded: ISIBS, SUSPRM, SUSPR3

Partially loaded files: SUSSR2, SUSSR3, SUSITMY, SUSBS, LSC, ASC, ASC-IMC, ISIHAM4, SUSETMX

SVN code with local SVN modifications: Dave

Attached is the list of FE user source code with outstanding local mods in SVN. Also listed, that for the guardian nodes source files.

Non-image files attached to this report
H1 General
jeffrey.bartlett@LIGO.ORG - posted 15:58, Tuesday 23 December 2014 (15816)
Ops Shift Summary
LVEA: Laser Hazard
Observation Bit: Commissioning  

07:30 Karen – Cleaning in the LVEA
07:50 Cris – Cleaning in the LVEA
08:02 DGR delivering doors to VPW
08:50 Add 225ml water to diode chiller
09:30 Corey – Working in Squeezer Bay
09:35 Dave – Upgrade h1iscex & ey to RCG2.8.7 
09:35 Richard – Going to LVEA roof
10:28 Dave – Restart h1iscex
10:30 Praxair delivery of N2 to CP1
11:19 Kyle – Working on Instrument air in CS
11:42 Dave – Restart h1iscex
11:45 Dave – DAQ restart
12:01 Dave & Jim – Shutting down H2 Test Stand in LVEA
13:02 Richard – Turning on ESD at End-Y
13:34 Richard – Finished at End-Y
13:41 Elli – In LVEA working on IO2TR
14:00 Kyle – BSC9 on turbo pump
14:13 The PLCs at End-X stopped
14:35 Daniel – Restarted the End-X PLCs
14:37 Dave – Restart h1iscey and h1iscex
14:42 Dave – Restarted the DAQ
15:00 Kyle – Going to X-Beam manifold
15:49 Kyle – Going to End-X to check on pump down

Merry Christmas to all and to all a good night! 
LHO VE
kyle.ryan@LIGO.ORG - posted 15:42, Tuesday 23 December 2014 (15814)
Finished roughing X-end -> switched over to turbo
X-end turbo also being backed by QDP80 -> Local scroll pump has same issue with its relay module as does the Y-end scroll, i.e. leads not landed on correct relay terminals or relay terminals not matching universal socket labeling etc. -> These two units have different relay components than the functioning YBM and XBM Turbo backing scrolls (why?)
LHO VE
kyle.ryan@LIGO.ORG - posted 15:36, Tuesday 23 December 2014 (15813)
~1500 hrs. local -> Spun down XBM turbo and stopped local scroll pump
This was running but valved-out for the recent HAM1/GV5/GV7 activities
LHO VE
kyle.ryan@LIGO.ORG - posted 15:34, Tuesday 23 December 2014 (15812)
Replaced pressure switches in control panel of Corner Station instrument-air dryer
Kyle, Bubba 
Switch contacts not really open and not really closed, i.e. ambiguous -> Resulted in switching failures past 24 hours or more
H1 SEI
hugh.radkins@LIGO.ORG - posted 15:07, Tuesday 23 December 2014 (15811)
WHAM3 HEPI Sensor Correction coming from B STS2,Switched to A STS2

Attached is before and after ISI CPS & GS13 Spectra--No real change--Refs are with B STS and current traces are with the A STS.

Images attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 14:34, Tuesday 23 December 2014 - last comment - 14:42, Tuesday 23 December 2014(15808)
EndY ETMY BSC10 HEPI Z Tilt Decoupling

See attached for the results.  The inline coupling is on the left and crossaxis is in the right plots.  The medms show the matrix elements.

This aLOG details the measurement.

Pretty good results here with ~10x improvement at the lowest frequencies.

Images attached to this report
Comments related to this report
hugh.radkins@LIGO.ORG - 14:42, Tuesday 23 December 2014 (15810)

Here are the results from EndX ETMX BSC9.  The HEPI Tilt Decoupling improvement approaches x10.  Looks like the crossline still couples at 0.1 hz though.  Maybe further tuning could be of benefit.

Images attached to this comment
H1 PSL
jeffrey.bartlett@LIGO.ORG - posted 14:30, Tuesday 23 December 2014 (15805)
PSL Weekly Measurements
Results from PSL weekly health report weeklies are posted below
Images attached to this report
H1 ISC
stefan.ballmer@LIGO.ORG - posted 14:23, Tuesday 23 December 2014 - last comment - 16:34, Tuesday 23 December 2014(15807)
Converting contrast defect to ITM RoC change (diopter change)
The following elog is in support of Evan's upcoming elog on last nights TCS transient (turning off TCS)

Bottom line:

The contrast defect (CD) can be modeled as

CD = CD_0 + pi^2/8 * D^2*w^4/lambda^2 

where:
CD    : contrast defect
CD_0  : residual contrast defect, not due to ITM RoC mismatch
D     : Diopter change in (one) ITM, double pass, i.e. D=2*( 1/R_new - 1/R_old )
w     : beam spot radius on the ITM, nominally 53mm
lambda: wave length = 1.064e-6m 

Derivation: 

- incident beam:            |Psi> =  N exp(-r^2/w^2)
- ITMX reflection operator: exp(i*k*D*r^2/2)
- ITMY reflection operator: 1
- reflected field:          |r> = |Psi> * exp(i*k*D*r^2/4) *   cos(k*D*r^2/4)
- dark port field:          |t> = |Psi> * exp(i*k*D*r^2/4) * i sin(k*D*r^2/4)

- Power in dark port due to RoC mismatch:
    = k^2*D^2*w^4/32 = pi^2/8 * D^2*w^4/lambda^2 
  The bottom line formula for contrast defect follows from this.

Some other useful expressions:
- Power reflected from the Michelson:
    = 1 -  = 1 - pi^2/8 * D^2*w^4/lambda^2 
  Note that this power will be in a different mode, so the mode matching into the recycling cavity is expected to change.

And for reference, some Gaussian integrals:
   h_n := 
   h_n = n/4 w^2 h_(n-2)
   h_0 = 1
   h_2 = 1/2 w^2   
   h_4 = 1/2 w^4   
   h_6 = 3/4 w^6   
   h_8 = 3/2 w^8   


 
  
Comments related to this report
evan.hall@LIGO.ORG - 16:34, Tuesday 23 December 2014 (15815)

Stefan, Evan

Since we turned off the TCS last night and left PRMI locked on carrier, we have roughly 8 hours of good data that tells us the (1) the contrast defect and (2) the behavior of the ITM thermal lens as a function of time. To extract these quantities, we did the following:

  • We extrated minute trends of LSC-POP_A_LF_OUT, LSC-REFL_A_LF_OUT, and LSC-ASAIR_A_LF_OUT from last night.
  • We calibrated POP_A power to PRC power as follows:
    • FM10 already calibrates the POP_A counts into microwatts of power incident on the PD.
    • In Kiwamu's recycling gain measurement (LHO#15793), he misaligned PRM and locked MICH on a dark fringe. There was 7.2 μW on POP_A. Assuming a PSL power of 10.7 W (measured today), an IMC transmission of 83 % (LHO#9954), and a PRM transmission of 3.0 % (galaxy), this means there was 260 mW of power in the PRC.
    • The calibration PRC / POP_A is therefore 3.7×104 W/W.
  • We calibrated ASAIR_A power to SRC power as follows. Note that what I call "SRC power" is power leaving the BS going toward SRM (this is to distinguish it from "AS power" seen after the SRM).
    • ASAIR_A is already calibrated into microwatts of power incident on the PD.
    • In Stefan's contrast defect measurement (LHO#15332), he found the maximum SRC power from the free-swinging michelson was 1890 ct on ASAIR_B (not A). Today I measured the calibration to A is ASAIR_A / ASAIR_B = 3.52 ct/ct. The maximum SRC power from the free-swinging Michelson I take to be 10.7 W × 0.83 × 0.03 × 0.986 (this last number is the ITM reflectivity).
    • The calibration SRC / ASAIR_A is therefore 39 W/W.
  • We calibrated REFL_A to REFL (i.e., the power heading from the PRM to IM4) as follows:
    • FM10 already calibrates the REFL_A counts into milliwatts of power incident on the PD.
    • In yesterday's RFAM measurement (LHO#15781), we measured 81 mW on REFL_A with the PRM aligned and the ITMs misaligned. The REFL power I take to be 10.7 W × 0.83 × 0.97.
    • The calibration REFL / REFL_A is therefore 106 W/W.
  • It can be shown that the ratio PSRC / PPRC = TM RI, where TM is the carrier power transmissivity of the Michelson, and RI is the power reflectivity of each ITM. I assume RI = 0.986. Therefore, we can solve for TM as a function of time given the calibrated power measurements. This is given in the upper plot of the attachment. From last night's data alone, the starting value of TM is 1.115×10−3. However, Daniel has previously corrected the contrast defect for the presence of the 45 MHz sidebands (LHO#15432), finding a defect of 0.99×10−3. In the plot, I have rescaled TM by 0.99 / 1.115 to reflect this.
  • To convert ths into a change into diopters according to Stefan's formula, we need to know the "best" contrast defect achievable (i.e., the residual defect assuming no RoC mismatch). Stefan's measurement (LHO#15332) showed a minimum in ASAIR_B of (−0.2 + 1.78) ct with the Michelson locked on a dark fringe. According to Daniel's analysis, 0.17 ct of this is due to the 45 MHz sideband. So the net minimum is 1.41 ct. With a bright fringe power of 1890 ct, I take the "best" contrast defect to be 8×10−4.
  • By using this "best" defect and Stefan's formula above, we compute change in the ITM thermal lens (in diopters) as a function of time. This is given in the lower plot of the attachment.

In principle, we can also use the above data to extract the mode-matching into the PRMI as a function of time. Perhaps we will pursue this later.

Non-image files attached to this comment
H1 ISC
daniel.sigg@LIGO.ORG - posted 14:16, Tuesday 23 December 2014 (15806)
Updated iscex/ey models

A couple of changes were implemented in the iscex/ey models:

H1 PSL
jeffrey.bartlett@LIGO.ORG - posted 11:13, Tuesday 23 December 2014 (15804)
PSL DBB Scans
Ran PSL DBB scans this morning. Results are posted below
Non-image files attached to this report
H1 TCS
aidan.brooks@LIGO.ORG - posted 11:02, Tuesday 23 December 2014 (15803)
Problem with the BS alignment causing no HWS signal

Elli, Aidan

Elli noticed that ITMX-HWS wasn't getting a return beam even though all in-vacuum optics are nominally aligned (when viewing the OPTICALIGN channels). We traced the problem to the BS which shifted alignment about 7 hours ago. The optical levers saw a sudden shift in alignment.

I've asked Stefan and Elli to look into this.

Images attached to this report
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 10:54, Tuesday 23 December 2014 (15802)
CDS model and DAQ restart report, Monday 22nd December 2014

model restarts logged for Mon 22/Dec/2014
2014_12_22 00:41 h1fw0
2014_12_22 08:39 h1nds1
2014_12_22 22:28 h1fw1

all unexpected restarts. Conlog frequently changing channels list attached.

Non-image files attached to this report
H1 TCS
eleanor.king@LIGO.ORG - posted 10:36, Tuesday 23 December 2014 (15801)
Co2 laser back on

ITMX CO2 laser back on at 255mV requested power.

H1 SEI
hugh.radkins@LIGO.ORG - posted 09:07, Tuesday 23 December 2014 (15799)
SEI Sensor Corrections Back on Now

Switch HAM2 ground sensor from B to A.

All HAMs running X Y & Z sensor correction from ground to ISI, except HAM3 is doing Z from the Ground to HEPI.

All BSCs (Corner Station) running X & Y from ground to ISI Stage1 and Z from ground to HEPI.

HAM2 HAM3 HAM4 HAM5 HAM6 ITMY BS ITMX BSC1 BSC2 BSC3

H1 PSL
jeffrey.bartlett@LIGO.ORG - posted 08:50, Tuesday 23 December 2014 (15798)
Top Off Diode Chiller Water
Added 225ml of water to topped off the diode chiller water level ahead of the holiday break. 
H1 ISC
stefan.ballmer@LIGO.ORG - posted 18:10, Monday 22 December 2014 - last comment - 09:58, Tuesday 23 December 2014(15792)
DRMI 3f & PRMI (carrier and SB) - all with WFS
Elli, Evan, Thomas, Kiwamu, Stefan

First we made sure we can still run on the 3f diodes with WFS on:
 - After reconnecting REFLAIR_B and removing the beam dump that worked without a hitch - same WFS gains as coded for DRMI.

Next we wanter to check the PRMI - first on SBs:
- We temporarily turned of the WFS and Kiwamu simply kicked out the SRM by misaligning it - the PRMI stayed locked.
- So we simply turned on all WFS with the same gains as DRMI (without the SRCL loops of course). They worked just fine.

Finally we locked the PRMI on the carrier.
- There we had to change the WFS gain for PRC1, PRC2 and MICH. Those 3 loops were then simply closed.
- We had to slightly lower the MICH_P gain, as we were developing an oscillation.
- Kiwamu will post a PRC recycling gain measurement form that data.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 18:32, Monday 22 December 2014 (15793)

The carrier recycling gain was measured to be 45 with the three ASC loops closed in PRMI.

Please forget the previous measured recycling gain (alog 15527).

(Some numbers)

  • POP_A increased from 7.2 uW (which I subtracted a dark offset of -6.3 uW) to 10350 uW
  • According to the galaxy web page, I assumed Tp to be 3.1 %.
  • Therefore Gp = 10350 uW / 7.2 uW x Tp =  45
  • Also, for cross-check, I looked at POPAIR_A as well.
  • POPAIR_A increased from 29.6 uW (with an offset of -0.8 uW being subtracted) to 43200 uW.
  • This gives a recycling gain of 43500 uW / 29.6 uW x Tp = 45

Note that the IMC incident power was at 10 W during the measurement. REFL_LF dropped from a nominal of 83 mW to 6.3 mW when the PRMI was locked. The dark port ASAIR_A_LF stayed at 12000 counts during the lock. We could see a donuts mode at the dark port digital camera.

kiwamu.izumi@LIGO.ORG - 20:03, Monday 22 December 2014 (15795)

We shut off the ITMX CO2 laser at 20:00:40 in local time (4:00:40 UTC) for tomorrow's HWS project. We are leaving the PRMI locked on the carrier to see what happenes.

evan.hall@LIGO.ORG - 20:11, Monday 22 December 2014 (15796)

To avoid collision between the TCS step and Hugh’s sensor correction test, we have set the the senscor test to start 4.5 hours from now (through the magic of sleep).

evan.hall@LIGO.ORG - 21:22, Monday 22 December 2014 (15797)

Some notes on the PRMI recycling gain measurement (UTC date is 2014-12-23):

  • 01:55:40 – PRMI is carrier-locked with ASC loops on
  • 01:59:20 – MICH is locked on a dark fringe.

  • 02:00:00 – IMC is unlocked.

Also, the last week’s improvements to the PRMI carrier locking (including ASC improvements) are now implemented in the LSC_CONFIGS guardian.

evan.hall@LIGO.ORG - 09:58, Tuesday 23 December 2014 (15800)

The lock held for about 8 hours, from about 8 PM to 4 AM local time.

Images attached to this comment
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