Displaying reports 79621-79640 of 83254.Go to page Start 3978 3979 3980 3981 3982 3983 3984 3985 3986 End
Reports until 10:50, Monday 06 August 2012
H1 SEI
corey.gray@LIGO.ORG - posted 10:50, Monday 06 August 2012 (3733)
HAM3 ISI Spring Profiles

To measure the Spring Profile one must use a plunge micrometer and then measure the distance from the top of the Optics Table down to the Spring.  For each Spring there are two access points/thru-holes for the micrometer:  at the Spring Tip & at the Spring Base (I forgot to measure the Spring Base measurement when I did this last Wed, so I re-did the measurement this morning)

HAM3 Spring Profiles

Spring 1 (where tip location warrants corner location, in other words Spring1 is mounted on Spring Post which has Corner 3 Actuator & CPS, but Tip is in Corner1 zone)
base:  0.388"
tip:  0.375"

Spring 2
base:  0.399"
tip:  0.381"

Spring 3
base:  0.390"
tip:  0.378"

These measurements were made with our clean plunge micrometer.  It was fitted with a 2" extension.  Measurements are +/- 0.0005" (this is the slop of the locked Lockers).  I also made Tip measurements where I avoided the Spring Hatches---just stayed on the Optics Table.

H1 SEI
greg.grabeel@LIGO.ORG - posted 10:23, Monday 06 August 2012 (3734)
Unit6 storage container purge
On July 31st Unit #6 was placed into a storage container. Aug. 1st a purge was started at 10:30am. Ambient air was 8.2 tdºC at 24.7ºC. Boil-off LN2 was run at 20lpm until about Aug. 3rd 2:00pm.

I tried to dry out the bag the wand was in and get a baseline for the purge gas, but after approximately 15 minutes of purging just the ameristat bag and the dewpoint wand was reading -34.4tdºC and 25.5ºC. I must have been picking up a fair bit of moisture from the line and bag.

Interestingly Unit 6 in the storage container dropped in dew point much faster than HAM6 in a shipping container. Maybe there is a significant difference between the shipping and storage containers. Do the inflow and outflow locations for the purge make a difference? Less surface area in a storage container?
Images attached to this report
H2 DAQ
james.batch@LIGO.ORG - posted 09:37, Monday 06 August 2012 (3732)
Restarted h2nds0 daqd process
Found that the daqd process had quit on h2nds0.  Last error message in the log file:

Invalid broadcast received; seq=3177250 tp_seq=3177267 gps=1028180001 tp_gps=1028180002 gps_n=62500000 tp_gps_n=187500000

Restarted daqd process.
Logbook Admin Bug
jeffrey.kissel@LIGO.ORG - posted 08:55, Monday 06 August 2012 (3731)
Hitting "Upload File" without a file chosen shows white screen
If a user is in the middle of uploading files (or even just getting started), and he forgets to select a file for uploading and subsequently hits "UPLOAD FILE" with nothing selected, it takes the user to a blank white screen. Thankfully, nothing is lost, and one can just hit his browser's back button, but the log should throw a warning / error when this situation arises. A pop-up that gray's out the log, saying "You've not selected anything to attach, please browse for a file" with an "OK" acknowledge button would suffice. Or if that's too sophisticated for the infrastructure of the log, this user error should at least take you to another page with the same warning, and a link back to the upload page and/or the add report page. 
Logbook Admin Feature Requests
jeffrey.kissel@LIGO.ORG - posted 08:45, Monday 06 August 2012 (3730)
Make Double Quotes search for Exact String in Quick Search
One of the nice features of commercial search engines is that surrounding a phrase with double quotes forces the search to use the whole phrase as an exact string, i.e. "Optical Lever" returns only results that contain the whole phrase, not every entry with either "optical" or "lever." Is it possible to do this with our aLOGs?
Logbook Admin Feature Requests
jeffrey.kissel@LIGO.ORG - posted 08:41, Monday 06 August 2012 (3729)
Make Section + Task colors for all aLOGs the same
In my bouncing between aLOGs, I've found that the colors for different Sections + Tasks are not symmetric between them. Any chance we could? (I'd specifically notices that the LogBook Admin Sections are RED in the LHO aLOG, and SEA GREEN in the LLO aLOG).
Logbook Admin Bug
jeffrey.kissel@LIGO.ORG - posted 08:21, Monday 06 August 2012 (3728)
Title /sections /tasks in comments do not show up in resulting aLOG
When writing a comment to an aLOG, the user has the option to change the title (as opposed to the default "Comment to [insert original subject here]"), or change the Section / Task. However, after submitting the entry, these additions / edits are not reflected on the resulting comment. Interestingly enough, the information is stored, however, because when one clicks to edit the comment, the changes and new title are still there.

See, for example, LHO aLOG 3727, LHO aLOG 3550, or LLO aLOG 4156.
H1 SUS
jeffrey.garcia@LIGO.ORG - posted 01:18, Monday 06 August 2012 (3726)
H1 SUS PR2 Damp ON/OFF Spectra
The attached are the Euler and OSEM-basis spectra for the H1 PR2 M1-stage OSEMs. Each plot contains traces when M1 Damping was on and off from the nights of 08-01-2012 and 08-02-2012.   
Non-image files attached to this report
H1 AOS
robert.schofield@LIGO.ORG - posted 18:16, Sunday 05 August 2012 - last comment - 18:29, Sunday 05 August 2012(3724)
Arm relocked after SUS, ISI, HPI trip

With phone help from Bram, I reset  SUS, ISI and HPI,  which had tripped in the middle of the night, and relocked the arm. Low power though.

Comments related to this report
bram.slagmolen@LIGO.ORG - 18:29, Sunday 05 August 2012 (3725)

That is on BSC6.

I treid to use the new tdsdither scripts to improve the alignment, but it can't connect to h2nds0. Got the error 

controls@opsws4:scripts 0$ ./tdsdither 2.3 50 5 0 300 H2:SUS-ETMY_M0_TEST_Y_EXC H2:ISC-ALS_EY_REFL_PWR_MON_OUT H2:SUS-ETMY_M0_OFFSET_Y 10 5

		== tdsdither output format ==
(coherence magnitude phase signal time) Step dx to x

ERROR: LDAQ - Unable to connect to NDS h2nds0
Warning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0
Warning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0
Warning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0
Warning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0
Warning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0
^XWarning: tdsDemod is having trouble.  Retrying...ERROR: LDAQ - Unable to connect to NDS h2nds0

I tried to do
			controls@opsws4:scripts 0$ NDSSERVER=h2nds1:8088
to force to look at nds1 without luck. Seems there is some hardcoded server address.
 
also ezcaswtich doesn't seem to work either.
 
Unfortunately will leave the cavity with a less than optimal alignment.
LHO General
patrick.thomas@LIGO.ORG - posted 19:43, Friday 03 August 2012 (3722)
plots of dust counts
Attached are plots of dust counts > .5 microns in particles per cubic foot.
Non-image files attached to this report
LHO General
patrick.thomas@LIGO.ORG - posted 17:57, Friday 03 August 2012 (3721)
dust monitor at end X
I have placed a dust monitor in the clean room at end X. It is set to location 1.
H2 ISC
bram.slagmolen@LIGO.ORG - posted 17:15, Friday 03 August 2012 (3719)
OAT locked for the weekend

Reset the watchs dogs for ITM SUS, ISI and HEPI (needed to zero the ITM dc alignemtents).

I did a quick dither alignment of the TM to the laser beam.

I engaged the ISI isolation on both ITM and ETM (I think they don't have the boost on), and enabled the offload to the ETM HEPI.

attached are a spectrum and a striptool.

All is running smoothly.

Images attached to this report
H2 AOS
bram.slagmolen@LIGO.ORG - posted 16:52, Friday 03 August 2012 - last comment - 17:23, Friday 03 August 2012(3718)
FMY USER DACKILL

In the H2 FMY suspension the USER DACKILL has white screens. I am not even sure if the damping feedback is going out to the suspension or not.

I would not be able to reset this if it had tripped. Would be nice if this can be fixed.

Comments related to this report
jeffrey.garcia@LIGO.ORG - 17:23, Friday 03 August 2012 (3720)
The white medm is only indicative of the fact that the medm is a little out of date and is looking at another channel that probably doesn't exist. FMY is currently being damped, however. There are still values being sent out from the IOP DAC medm, so all indications are that the actuation is reaching FMY.  
H2 ISC
bram.slagmolen@LIGO.ORG - posted 16:48, Friday 03 August 2012 (3717)
OAT RefCav

Removed the 90/10 beam splitter in front of the RF LSC diode, and replaced it with a 50/50 beam splitter. Adjusted the gain to set the UGF to ~300 kHz. I tried to insert a ND filter to see if the 2.74 Hz peak disappears, but don't have a conclusive result yet.

LHO VE
kyle.ryan@LIGO.ORG - posted 16:45, Friday 03 August 2012 (3716)
Leaks on Vertex output MC tube flanges
Progress on the leak testing of the Vertex has been hampered due to the prevalence of "very" loose bolts on 80% of the flanges on the GNB provided MC spools.  After finding that 12 of the first 15 flanges tested were leaking badly I ceased spraying any additional helium and, instead, torqued the bolts on the flanges which were leaking.  This was very time consuming and was not "on the schedule" but did manage to demonstrate that the majority of leaking flanges could be made leak tight by doing this. 

I will propose that all of the GNB joints (leaking and not yet leaking) be torqued on Monday (Apollo help?) before continuing on with the helium leak testing. 
LHO General
cheryl.vorvick@LIGO.ORG - posted 16:25, Friday 03 August 2012 (3715)
Ops Day Summary
Aug. 3 OPS:

Start of the day: 
ISI tripped on ETMY - HEPI tripped on ITMY - Vincent looking into it, Bram emailed

Work going on:
craning arm to install on HAM3
Filiberto to EY to pull network cable
Karen to LVEA to clean
Patrick working in the NYN room
Patrick to EX to install dust monitor
Eric to HAM2 to install hardware on actuators
Kyle to EY - retrieving equipment from VEA
Alex to EY - inventory in TMS lab
Michael R. to EY TMS lab to verify tagged out lasers
Doug to HAM3 optics table to measure some threaded hole diameters
Karen and Chris to EY to clean
HAM3 has an ARM attached to it
H1 SUS
jeffrey.bartlett@LIGO.ORG - posted 15:15, Friday 03 August 2012 (3714)
H1-MC3 Phase 1b Testing
[Jeff Bartlett and Andres Ramirez]

After replacing a broken magnet on the H1-MC3 intermediate mass, we ran Phase 1b transfer function. The results showed a rubbing issue at the side and left BOSEMs on the M1 Level, (2012-07-30_2100_X1SUSMC3_M1_ALL_TFs). While looking for something rubbing on the upper mass (which we did not find), discovered the T3 BOSEM showed no voltage, which was traced back to a loose connection at the D25 end of the cable. After reseating the cable, the SpeedDials values still did not look right. We reran the Open Light script for T3. The Open Light voltages were OK; the Offset and Gain values in MEDM were not correct. We reran the Open Light script for all the BOSEMs and adjusted the MEDM offsets and gains as necessary. 

We reran the transfer functions this morning (2012-08-03_0730_X1SUSMC3_M1_ALL_TFs), the results look much better. Requesting final approval for metal build of H1-MC3.    
Non-image files attached to this report
H1 AOS
jeffrey.kissel@LIGO.ORG - posted 20:18, Friday 27 July 2012 - last comment - 08:14, Monday 06 August 2012(3642)
Calibrated Optical Lever Spectra -- Third Time's the Charm
J. Kissel, T. Vo

After finally getting the optical levers aligned while the optics were aligned in a good state for the cavity, I've taken a spectra of both H2 SUS ITMY and H2 SUS ETMY in the quiet time mentioned in the isolationist data miner's dream. 

There're lots of fun features, differences, and similarities between the two test mass spectra, that will be good to noodle over. This will be excellent material to try to reproduce via models!


If anyone wants to gather future data, this calibrated template lives here:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/Data/2012-07-27_H2OAT_Oplev_ASDs.xml
Non-image files attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 08:14, Monday 06 August 2012 (3727)
Please disregard the calibration in this plot. As commented by Thomas in LHO aLOG 3713, we've discovered flaws in the data analysis, in addition to some non-linearities in a step of the calibration originally posted in LHO aLOG 3614. These flaws result in the calibration scale factor being off by more than an order of magnitude in some cases. We're working on getting accurate numbers this week, thanks for your patience!

Note, since there is no frequency dependence to the calibration (all analog whitening is compensated for in real time digitally), it is *only* the scale factor that is off.

Details:
--------
For future reference, and to give credit where credit is due, suspicion was originally raised by M. Evans and P. Fritschel, who sanity checked the numbers in the spectra with the following calculation:

- The data I show here was for the cavity unlocked. They say the P motion (and even Yaw motion) of both test masses, but ETMY specifically, is "just too damn high".

- I walked them through our extensive calibration technique, and they believe the methods in principle:
	- You've got a signal in [cts], from which you read a known translation, in [m]. 
        - You've turned it into [rad] using the lever arm, L to (or from) from test mass. 
        - The ratio of those two numbers, [rad] / [ct] is the calibration to which you should multiply your signal in order to get [rad] of test mass motion. 
But it practice, something has gone astray.

- Thinking the motion was large just because the cavity was unlocked, I re-measured the cavity motion using the optical levers with our current calibration and the cavity locked (2012-08-02 04:00 UTC = 2012-08-01 9:00p PDT, a little after Alberto said he locked the cavity for the night), and compared it against cavity unlocked on 2012-07-27 02:51 UTC. See first attachment, 2012-08-02_H2OAT_Oplev_ASDs.pdf.

- The motion is about the same, maybe different by a factor of 2 at most. Let's say the ETMY is moving dTheta_E = 50 urad, and ITMY is moving at dTheta_I = 5 urad at the QUADs first modes at 0.43 and 0.56 Hz, which dominate the time series (which has been confirmed, but is not shown, by *look* at the time series that formed these spectra in DTT).

- Using the calculation attached from Seigmann, "LASERS" pg 768 and 769, (CavityMisalignment.pdf) and assuming the cavity stability parameters
g1 = g2 = g 
g  = 1 - L/R 
   = 1 - (length of the cavity) / (radii of curvature of cavity mirrors) 
   = 1 - 4e3 [m] / 2.2e3 [m] = -0.8 [ ]
then that means that (from Eq 32) of attached (taking the ETM as mirror 1), the spot is jiggling on the face of the test mass by a distance, 
| dx | = | dTheta_E * L * g / (1 - g^2) + dTheta_I * L / (1 - g^2) |
       = | 50e-6 [rad] * 4e3 [m] * -0.8 [ ] / (1 - (-0.8 [])^2 ) + 5e-6 [rad] * 4e3 [m] / (1 - (- 0.8 [ ])^2) |
       = 0.38889 [m]
... that's 38 [cm], which is about as big as the diameter of the test mass (34 [cm])!

- When you look at the spot on the ETM with the camera, while the cavity is locked, one sees the the spot moving *at most* 1 [cm] peak-to-peak in Pitch, and it *certainly* not from the top to bottom of the test mass.
Non-image files attached to this comment
Displaying reports 79621-79640 of 83254.Go to page Start 3978 3979 3980 3981 3982 3983 3984 3985 3986 End