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ID Date Authorup Type Category Subject
  10882   Fri Jan 9 10:52:37 2015 SteveUpdateSUSPIT trend plots at the ends

100 and 10 days trends of ETMX and ETMY_SUSPIT.  One can see clearly the earthquaks of Dec.30 and 31 on the 10 day plot. You can not see the two shakes  M3.0 & M4.3 of Jan. 3 

The long term plot looks OK , but   the 10 day plot show the problem of ETMX as it was shaken 4 times.

 

  10922   Tue Jan 20 09:32:19 2015 SteveUpdatePEMdusty Monday morning

Yesterday morning was dusty. I wonder why?

The PRM sus damping was restored this morning.

  10934   Fri Jan 23 10:07:15 2015 SteveUpdateSUSSUS Drift ETMX vs ETMY

ETMX YAW stopped drifting Jan 8, 2015

Quote:

I made little scripts to go with the sus driftmon buttons, that will servo the alignment sliders until the susyaw and suspit values match the references on the driftmon screen.

  10948   Wed Jan 28 08:53:01 2015 SteveUpdatePEMSeismometer Vertex is covered

 

Quote:

I have just put the seismometers back into their nominal positions, on the concreted slabs.  The T-240 is in the vertex, and the 2 Guralps are at the end stations.

The vertex location doesn't have a spaghetti pot right now.  There is an aluminum support for cable trays that is welded to the supports under the beam tube that is in the way.  The pot looks like it will fit barely, if it were slid totally horizontally into place.  However we can't do that with the seismometer in place.  I'll chat with Steve this afternoon about our options. 

Since I don't know that we are planning on ever putting a cable tray on the inside of the beamtube, perhaps we can cut ~6 inches of this piece away. 

Aluminum support beam removed and seismometer is covered.

  10983   Fri Feb 6 10:03:23 2015 SteveUpdatePEMdusty days

 

Quote:

Yesterday morning was dusty. I wonder why?

The PRM sus damping was restored this morning.

Yesterday afternoon at 4 the dust count peaked 70,000 counts

Manasa's alergy was bad at the X-end yesterday. What is going on?

There was no wind and CES neighbors did not do anything.

  10989   Mon Feb 9 08:40:49 2015 SteveUpdateSUSrecent earthquake 4.9

Baja 4.9 m earth quake tripped suspentions, except ETMX Sus damping recovered. MC is locking.
 

  11068   Wed Feb 25 14:35:32 2015 SteveUpdatesafetysafety audit 2015

Safety audit went soothly. We thank all participients.

Correction list:

1, Bathroom water heater cable to be stress releived and connector replaced by twister lock type.

2, Floor cable bridge at the vacuum rack to be replaced. It is cracked.

3, Sprinkler head to be moved eastward 2 ft in room 101

4, Annual crane inspection is scheduled for 8am Marc 3, 2015

5, Annual safety glasses cleaning and transmission measurement will get done tomorrow morning.

  11085   Fri Feb 27 14:17:51 2015 SteveUpdatesafetysafety audit 2015

Safety glasses were measured and they are all good. I'd like to measure your personal glass if it is not on this picture.

Quote:

Safety audit went soothly. We thank all participients.

Correction list:

1, Bathroom water heater cable to be stress releived and connector replaced by twister lock type.

2, Floor cable bridge at the vacuum rack to be replaced. It is cracked.

3, Sprinkler head to be moved eastward 2 ft in room 101

4, Annual crane inspection is scheduled for 8am Marc 3, 2015

5, Annual safety glasses cleaning and transmission measurement will get done tomorrow morning.

 

  11092   Tue Mar 3 09:42:40 2015 SteveUpdateSUSETMX is drifting

The temperature of the east and south ends  are normal, they are about the same.

 

  11093   Tue Mar 3 11:38:11 2015 SteveUpdatesafetyprofessional crane inspection

 

Quote:

Safety glasses were measured and they are all good. I'd like to measure your personal glass if it is not on this picture.

Quote:

Safety audit went soothly. We thank all participients.

Correction list:

1, Bathroom water heater cable to be stress releived and connector replaced by twister lock type.

2, Floor cable bridge at the vacuum rack to be replaced. It is cracked.

3, Sprinkler head to be moved eastward 2 ft in room 101

4, Annual crane inspection is scheduled for 8am Marc 3, 2015

5, Annual safety glasses cleaning and transmission measurement will get done tomorrow morning.

 

Konecranes' Fred inspected and load tested all tree cranes at with 450 lbs

  11100   Thu Mar 5 10:32:58 2015 SteveUpdateSUSBS oplev servo turned off

The BS oplev servo was kicking up the BS. It was turned off

  11131   Wed Mar 11 13:54:18 2015 SteveUpdateGeneraltemporaly storage in the east arm

Green glass for aLIGO OMC shield is temporarly stored in the inside of the Y-arm.

  11147   Thu Mar 19 16:58:19 2015 SteveSummaryIOOMC alignment not drifting; PSL beam is drifting

Polaris mounts ordered.

Quote:

In the attached plot you can see that the MC REFL fluctuations started getting larger on Feb 24 just after midnight. Its been bad ever since. What happened that night or the afternoon of Feb 23?
The WFS DC spot positions were far off (~0.9), so I unlocked the IMC and aligned the spots on there using the nearby steering mirrors - lets see if this helps.

Also, these mounts should be improved. Steve, can you please prepare 5 mounts with the Thorlabs BA2 or BA3 base, the 3/4" diameter steel posts, and the Polanski steel mirror mounts? We should replace the mirror mounts for the 1" diameter mirrors during the daytime next week to reduce drift.

 

  11149   Fri Mar 20 10:51:09 2015 SteveSummaryIOOMC alignment not drifting; PSL beam is drifting

Are the two  visible small srews holding the adapter plate only?

If yes, it is the weakest point of the IOO path.

  11156   Sun Mar 22 18:42:40 2015 SteveUpdateVACvac pressure rose to 1.2mTorr

 

Quote:

We run out of N2 for the vacuum system. The pressure peaked at 1.3 mTorr with MC locked. V1 did not closed because the N2 pressure sensor failed.

We are back to vac normal. I will be here tomorrow to check on things.

We run out of N2 for the vacuum system 6 hrs ago. The pressure rose to 1.2 mTorr with V1 closed. The interlock worked! See Nirogen presure reading fixed at http://nodus.ligo.caltech.edu:8080/40m/10968

 

The vacuum interlock: Nitrogen pressure transducer is reading the pneumatic pressure continously at the pump spool and c1vac1 processing it. When it drops below 60 PSI it closes V1 gate valve and V4 & V5.  Gate valve V1 needs minimum 60 PSI to close. It is critical that V1 is closed before you run out of Nitrogen so the IFO pressure is contained.

 

IFO vacuum is back to Vac Normal. The MC is locked.

cc4 = 2E-6 Torr with VM1 open.

 

Daily N2 consumption measured to be 530PSI as 3 days on 3-27-2015 but note: it does vary !

I have seen it as high as 900 psi  The long term average ~750 psi

  11158   Mon Mar 23 09:42:29 2015 SteveSummaryIOO4" PSL beam path posts

To achive the same beam height each components needs their specific post height.

 Beam Height Base Plate Mirror Mount Lens Mount  Waveplates-Rotary 0.75" OD. SS Post Height                      
             
4" Thorlabs BA2   Newport LH-1   2.620"  
4" Thorlabs BA2 Polaris K1     2.620"  
4" Thorlabs BA2 Polaris K2     2.220"  
4" Thorlabs BA2   Thorlabs LMR1   2.750"  
4" Thorlabs BA2     New Focus 9401 2.120"  
4" Thorlabs BA2 Newport U100     2.620"  
4" Thorlabs BA2 Newport U200     2.120"  
4" Newport 9021   LH-1   2.0" PMC-MM lens with xy translation stage: Newport 9022, 9065A    Atm3
4" Newport 9021   LH-1   1.89 MC-MM lens with translation stage: Newport 9022, 9025        Atm2

We have 2.625" tall, 3/4" OD SS posts for Polaris K1 mirror mounts: 20 pieces

Ordered Newport LH-1 lens mounts with axis height 1.0 yes

 

  11170   Wed Mar 25 08:29:31 2015 SteveUpdateLSCMeh

  I turned on the HEPA at the south end during the LSC. Sorry I ment to turn it off.

Quote:

[Jenne, Den]

Overall a "meh" night for locking I think.  The script to all-RF worked several times earlier in the evening, although it was delicate and failed at least 50% of the time.  Later in the evening, we couldn't get even ~10% of the lock attempts all the way to RF-only. 

Den looked into angular things tonight.  With the HEPA bench at the Xend on (which it was found to be), the ETMX oplevs were injecting almost a factor of 10 noise (around 10ish Hz?) into the cavity axis motion (as seen by the trans QPD) as compared to oplevs off.  Turning off the HEPA removed this noise injection.

Den retuned the QPD trans loops so that they only push on the ETMs, so that we can turn off the ETM oplevs, and leave the ITMs and their oplevs alone. 

We are worried again about REFL55.  There is much more light on REFL55 than there is on REFL11 (a 90/10 beam splitter divides the light between them), and we see this in the DC output of the PDs, but there seems to be very little actual signal in REFL55.  Den drove a line (in PRCL?) while we had the PRMI locked with the arms held off resonance, and REFL55 saw the line a factor of 1,000 less than REFL 11 or REFL165.  The analog whitening gain for REFL11 is +18dB, and for REFL55 is +21dB, so it's not that we have significantly less analog gain (that we think).  We need to look into this tomorrow.  As of now, we don't think there's much hope for transitioning PRMI to REFL55 without a health checkup. 

 

  11175   Thu Mar 26 10:41:06 2015 SteveUpdateIOOThe PMC is not clamped

The PMC is seated on 3 SS balls and it is free to move. I'm sure it will move in an earthquake. Not much, because the input and output K1 mirror frame will act as an earthquake stop.Atm2

Are there a touch of super glue on the balls? No, but there are V grooves at the bottom and on the top of each ball.Atm3

 

  11184   Tue Mar 31 09:03:32 2015 SteveUpdateVACRGA scan pd78 day 182

 

 

  11188   Wed Apr 1 10:50:59 2015 SteveUpdatePEMconstruction ahead

The 40m fenced area will start storing this large ~ 8000 lbs chamber on April 14. The asphalt will be cut, jack hammered the next 2-3 days in order to lay concrete.

Their schedule is from 8 to 5 starting tomorrow.  We are asking them to work from 6 to 3pm

ETMX is about 12-15 ft away

  11198   Fri Apr 3 10:46:32 2015 SteveUpdateSUSOSEM sensor oscillation

ITMX, ETMY, BS and SRM are oscillating ?

  11200   Fri Apr 3 15:15:55 2015 SteveUpdateSUSBS oplev

I saw this kicking before  

Quote:

The BS oplev has been misbehaving and kicking the optic from time to time since noon. The kicks are not strong enough to trip the watchdogs (current watchdog max counts for the sensors is 135).

I took a look at the spectrum of the BS oplev error in pit and yaw with both loops enabled while the optic was stable. There is nothing alarmingly big except for some additional noise above 4Hz.

I have turned the BS oplev servo OFF for now.

 

  11203   Mon Apr 6 09:13:49 2015 SteveUpdatePEMjackhammering at ETMX
Quote:

The 40m fenced area will start storing this large chamber on April 14. The asphalt will be cut, jack hammered the next 2-3 days in order to lay concrete.

Their schedule is from 8 to 5 starting tomorrow.  We are asking them to work from 6 to 3pm

ETMX is about 12-15 ft away

Jackhammering was happening around 7:30am

It looks like it did no harm. It is too early to say what may have moved. Rana's worrisome  email was late.

The ground preparation is completed.

  11211   Thu Apr 9 07:41:22 2015 SteveUpdatePEMjackhammering at ETMX

There was a period of short unexpected jackhammering this morning. I asked them to stop.

The good mood of GTRX was not changed.smiley

 

  11217   Tue Apr 14 11:19:52 2015 SteveUpdatePEMlarge chamber has arrived

It is here.

Quote:

The 40m fenced area will start storing this large ~ 8000 lbs chamber on April 14. The asphalt will be cut, jack hammered the next 2-3 days in order to lay concrete.

Their schedule is from 8 to 5 starting tomorrow.  We are asking them to work from 6 to 3pm

ETMX is about 12-15 ft away

 

  11224   Thu Apr 16 10:32:42 2015 SteveUpdateOptical Leversoplevs monitoring

The IFO_overview of oplevs seems ok, The servos are working fine. The green arms are locked, but master and oplev_summary monitoring screens are not.

I'm proposing to Erick G. to postpone the oplev noise measurement.

  11230   Tue Apr 21 11:55:05 2015 SteveUpdateOptical Levers1103P noise measurement

Manasa and Steve,

Is this what you want?  Dashed lines are dark.

BS and PRM oplevs are blocked for this measurement. I will restore to normal operation at 4pm today.
 

  11233   Wed Apr 22 11:21:51 2015 SteveUpdateOptical LeversBS & PRM oplevs are back to normal

BS & PRM oplev is restored. Note: the F -150 lens was removed right after the first turning mirror from the laser. This helped Rana to get small spot on the qpd.

It also means that the oplev paths are somewhat different now.

 

 

 

  11234   Wed Apr 22 11:43:28 2015 SteveUpdateSUSETMX damping restored

ETMX sus damping restored.

  11238   Thu Apr 23 08:43:40 2015 SteveUpdateElectronicsEG&G InGaAs diodes in stock

RFpds box is moved from RF cabinet E4 to clean cabinet S15

Inventory updated at https://wiki-40m.ligo.caltech.edu/RF_Pd_Inventory

Large Area InGaAs PIN Photodiode -- C30642GH      6 pieces in stock

Product Details
in: Photodiodes

 

Large Area InGaAs PIN Photodiode -- C30642GH -- View Larger Image

Large Area InGaAs PIN Photodiode with a 2,0 mm active diameter chip in TO-5 package with flat glass window

Large area InGaAs PIN photodiode with useful diameter of 2,0 mm in a T0-5 package with a flat glass window. The C30642GH provides high quantum efficiency from 800nm to 1700nm. It features high responsivity, high shunt resistance, low dark current, low capacitance for fast response time and uniformity within 2% across the detector active area.

  11239   Thu Apr 23 15:40:41 2015 SteveUpdateGeneraltorque for 1/4-20

 

Few 1/4 -20 socket cap head screw with washers were tested for optimum torque.

QJR 117E Snap On  torque wrench was used. I found that 40 lb in was enough.

Looked up recommended values on the web later:

Our Thorlab SS 1/4-20 screw kits are SS 18-8 as DRY 70 inch / lbs max, lubricated  60 inch / lbs max

These numbers will varie with washers, material it's going into and so on!

BLACK-OXIDE Alloy Steel Socket Head Cap Screws can go much higher value

Thread Size 1/4"-20
Length 1/4"
Thread Length Full
Additional Specifications Black-Oxide Alloy Steel
RoHS Compliant

The standard among high-strength fasteners, these screws are stronger than Grade 8 steel screws. They have a minimum tensile strength of 170,000 psi. and a minimum Rockwell hardness of C37. Length is measured from under the head.

Inch screws have a Class 3A thread fit. They meet ASTM A574.

Black Oxide—Screws have been heat-treated for hardness, which results in a dark surface color.

 
The information in this 3-D model is provided for reference only. Details
 
 

We still do not know that what torque values we get best performance : minimum jiggel and drift etc.

After looking at these numbers I raise my recommendation to 50 inch / lbs on a std aplication.

Rana is next to calibrate his feelings and declare the right number.

Than Koji....and so on

Once we a number, than I buy more torque wrenches to fit it.

  11259   Mon Apr 27 09:09:15 2015 SteveUpdatePEMair cond filters checked

 

Quote:

 

Quote:

Yesterday morning was dusty. I wonder why?

The PRM sus damping was restored this morning.

Yesterday afternoon at 4 the dust count peaked 70,000 counts

Manasa's alergy was bad at the X-end yesterday. What is going on?

There was no wind and CES neighbors did not do anything.

Air cond filters checked by Chris. The 400 days plot show 3 bad peaks at 1-20, 2-5 & 2-19

  11260   Mon Apr 27 14:37:55 2015 SteveUpdateVACN2 pneumatic pressure watch

 

Quote:

Based on Jenne's chiara disk usage monitoring script, I made a script that checks the N2 pressure, which will send an email to myself, Jenne, Rana, Koji, and Steve, should the pressure fall below 60psi. I also updated the chiara disk checking script to work on the new Nodus setup. I tested the two, only emailing myself, and they appear to work as expected. 

The scripts are committed to the svn. Nodus' crontab now includes these two scripts, as well as the crontab backup script. (It occurs to me that the crontab backup script could be a little smarter, only backing it up if a change is made, but the archive is only a few MB, so it's probably not so important...)

This watch script gives little time to replace N2 cylinder. When the regulated supply drops below 60 psi the cylinder pressure is 60 psi too.

It is more of a statement that V1 is closed and act accordingly. It's only practical if you are in the lab.

Rana pointed it out correctly that we need this message 24 hrs before it happens. This requires monitoring  of total supplies , not the regulated one.

So we need pressure transducers on each nitrogen cylinder, before the regulator. The sum of the two N2 cylinder when they are full 4000 - 4500 psi

The first email should be send out at 1000 psi as sum of the two cylinders. This means that you have  1 day to replace nitrogen cylinder.

 Most of the time the daily consumption is 750 +-50 psi   

However sometimes  this variation goes up   ~750 +-150 psi

  11262   Tue Apr 28 09:49:26 2015 SteveUpdateVACVac Summery Channels

 

 

       Channel        

                    Function                                          Interlock action           
            

C1:Vac-P1_pressure   

 IFO vac envelope pressure           at 3 mT close V1 and PSL shutter
C1:Vac-P2_pressure  Maglev foreline pressure                      at 6 Torr close V1 
C1:Vac-P3_pressure  annuloses    
C1:Vac-CC1_pressure  IFO pressure   at 1e-5 Torr close VM1
C1:Vac-CC4_pressure  RGA  pressure    
 C1:Vac-N2pres  valve's drive  pneumatic 60-80PSI    

 

at 55 PSI close V1, at 45 PSI close all 
 It  does not exist yet 2 N2 cylinder sum pressure  

 

  11264   Thu Apr 30 16:30:25 2015 SteveUpdateVACN2 pneumatic pressure watch set up

We have 2 transduser PX303-3KG5V   http://www.omega.com/pressure/pdf/PX303.pdf They  will be installed on the out put of the N2 cylinders to read the supply pressure.

I will order one DC power supply  http://www.omega.com/pptst/PSU93_FPW15.html      PSU-93

One full cylinder pressure is ~ 2400 PSI max so two of them will give us ~9Vdc

The email reminder should be send at 1000 PSI  =  1.8 V

 

 

 

 

  11274   Tue May 5 16:02:57 2015 SteveUpdateVACVac Summery Channels with discription

As it was requested by the Bos.

It would be nice to read from the epic screen C1:Vac-state_mon.......Current State: Vacuum Normal, valve configuration

Quote:

       Channel        

                    Function                                              Description                                             Interlock         
             

C1:Vac-P1_pressure   

 Main volume of 40m interferro meter        P=Pirani gauge, Pressure range: ATM-760  to 1e-4 Torr at 3 mT close V1 and PSL shutter
C1:Vac-P2_pressure  Maglev foreline pressure

Maglev is the main pump of our vacuum system below 500 mTorr

It's long term pressure has to be <500 mTorr                  

 at 6 Torr close V1 
C1:Vac-P3_pressure  annuloses

 Each chamber has it's own annulos. These small volumes are indipendent from main volume.     Their  pressure  ranges are <5 mTorr at vac. normal valve configuration.

                                          
C1:Vac-CC1_pressure  IFO main volume

CC1=cold cathode gauge (low emmision), Pressure range: 1e-4 to 1e-10 Torr,

In vac- normal configuration CC1= 2e-6 Torr

at 1e-5 Torr close VM1
C1:Vac-CC4_pressure  RGA  pressure In vac-normal configuration CC1=CC4  
 C1:Vac-N2pres  valve's drive pneumatic    

The N2 supply is regulated to 60-80 PSI out put at the auto cylinder changer.

 at 55 PSI close V1, at 45 PSI close all 
 It  does not exist yet 2 N2 cylinder sum pressure

Each cylinder pressure will be measured before the regulator and summed for warning message to be send

at 1000 PSI

 

  11275   Fri May 8 08:16:46 2015 SteveUpdateLSCdrift in Y arm

Why is the Y arm drifting so much?

The " PSL FSS Slow Actuator Adjust " was brought back to range from 1.5 to 0.3 yesterday as ususual. Nothing else was touched.

I'm not sure if the timing scale is working correctly on theses summery plots. What is the definition of today?

The y-arm became much better as I noticed it at 5pm

 

  11276   Fri May 8 14:30:09 2015 SteveUpdateVACCC1 cold cathode gauges are baked now

CC1s  are not reading any longer. It is an attempt to clean them over the weekend at 85C

These brand new gauges "10421002" sn 11823-vertical, sn 11837 horizontal replaced 11 years old 421 http://nsei.missouri.edu/manuals/hps-mks/421%20Cold%20Cathode%20Ionization%20Guage.pdf  on 09-06-2012 http://nodus.ligo.caltech.edu:8080/40m/7441

Quote:

 

We have two cold cathode gauges at the pump spool and one  signal cable to controller. CC1  in horizontal position and CC1 in vertical position.  

CC1 h started not reading so I moved cable over to CC1 v

 

  11287   Tue May 12 14:57:52 2015 SteveUpdateVACCC1 cold cathode gauges are baked now

Baking both CC1 at 85 C for 60 hrs did not help.

The temperature is increased to 125 C and it is being repeated.

Quote:

CC1s  are not reading any longer. It is an attempt to clean them over the weekend at 85C

These brand new gauges "10421002" sn 11823-vertical, sn 11837 horizontal replaced 11 years old 421 http://nsei.missouri.edu/manuals/hps-mks/421%20Cold%20Cathode%20Ionization%20Guage.pdf  on 09-06-2012 http://nodus.ligo.caltech.edu:8080/40m/7441

Quote:

 

We have two cold cathode gauges at the pump spool and one  signal cable to controller. CC1  in horizontal position and CC1 in vertical position.  

CC1 h started not reading so I moved cable over to CC1 v

 

 

  11290   Wed May 13 13:33:34 2015 SteveFrogsPEMGuralp breakout box recovered

COD_Sugar napolion is due to Steve:  Item delivered, model CMG-SCU-0013, sn G9536

Quote:

Reward being offered for the safe return of this thing:

 

  11292   Fri May 15 16:18:28 2015 SteveUpdateVACVac Operation Guide

Vacuum Operation Guide is up loaded into the 40m-wiki. This is an old master copy. Not exact in terms of real action, but it is still a good guide of logic.

Rana has promissed to watch the N2 supply and change cylinder when it is empty. I will be Hanford next week.

  11324   Tue May 26 11:05:10 2015 SteveUpdatePEMworked around ETMY seism.

The cable tray holder cross beam is removed and cut short for good access to seismometer.

  11329   Thu May 28 10:42:19 2015 SteveUpdatePEMbad Guralp X-cable
Quote:

Tried swapping cables at the Guralp interface box side. It seems that all of our seismic signal problems have to do with the GUR2 cable being flaky (not surprising since it looks like it was patched with Orange Electrical tape!! rather than proper mechanical strain relief).

After swapping the cables today, the GUR2 DAQ channels all look fine: i.e. GUR1 (the one at the Y end) is fine, as is its cable and the GUR2 analog channels inside the interface box.

OTOH, the GUR1 DAQ channels (which have GUR2 (EX) connected into it) are too small by a factor of ~1000. Seems like that end of the cable will need to be remade. Luckily Jenne is still around this week and can point us to the pinout / instructions. Looks like there could be some shorting inside the backshell, so I've left it disconnected rather than risk damaging the seismometer. We should get a GUR1 style backshell to remake this cable. It might also be possible that the end at the seismometer is bad - Steve was supposed to swap the screws on the granite-aluminum plate on Thursday; I'll double check.

The Guralps were swapped.

What I did:   turned DC power off at 1X1,  hand carried them,  centered  each leveling bubbles, gently locked the jack screws and turned power back on.

ETMY at the east end now has CMG-T40-0008, sn T4157 as channel C1:PEM-SEIS_STS_1_Y_OUT_DQ.........

ETMX at south end now has CMG-T40-0053, sn T4Q17 as channel C1:PEM-SEIS_STS_2_Y_OUT_DQ.........

Conclusion:  Guralps are fine.  X  cable is bad. It was bad 6 months ago when it was made.

We can still swap the 3ft short cables at the granite base if Rana has not done it.

 

  11331   Thu May 28 16:43:52 2015 SteveUpdatePEMGuralps swapped

Koji and Steve,

The result: bad Guralp x-arm cable.

I will swap the short cables tomorrow at the base.

 

  11339   Mon Jun 1 08:32:14 2015 SteveUpdateSUSPRM damping restored

Local earthquake 3.8 Mag tripped only PRM

Vac monitor is not communicating.

PSL HEPA turned on
 

  11341   Mon Jun 1 15:22:19 2015 SteveUpdatePEMGuralps X- short cable is bad

 

Quote:

Koji and Steve,

The result: bad Guralp x-arm cable.

I will swap the short cables tomorrow at the base.

 

Short 46" long cables at the base plates were swapped. Their solderings looked horrible.

This cable actually worked at 5-5-2015

Bad cable at ETMY station now.  The new cable should be a little bit longer ~52"

  11344   Wed Jun 3 11:55:52 2015 SteveUpdateOptical LeversPRM-BS oplev

I'm getting ready change the Newport Ultima U100-AC to SS-Polaris-K1  LOW DRIFT MIRROR MOUNTS

Note: there is only one lens in the PRM lunching path (  only realized later ) , so the spots are large ~ 3 mm at PRM qpd and ~4.5 mm at BS qpd

The spots are well centered.

Atm3,  the spots were well centered yesterday ( the PRM is misaligned in pitch and retsore does not work today )


 

  11349   Tue Jun 9 10:57:12 2015 SteveUpdateSUS BS oplev laser tuned

Lenses removed from oplev beam path at elog entry 11246

 

  11352   Wed Jun 10 15:54:14 2015 SteveUpdateVACVacuum comp. rebooted

Koji and Steve succeded rebooting C1vac1, C1vac2 and pressure reading is working now

More tomorrow .........

 

  11354   Fri Jun 12 08:40:17 2015 SteveUpdateVACVacuum comp. rebooted

Koji and Steve,

One computer expert and one vacuum expert required.

Quote:

The serial connections to the vacuum gauges were recovered by rebooting c1vac1 and c1vac2.

Steve claimed that the vacuum screen had showed "NO COMM" at the vacuum pressure values.
The epics connection to c1vac was fine. We could logged in to c1vac1 with telnet too although c1vac2 had no response.

After some inspection, we decided to reboot the slow machines. Steve manually XXXed YYY valves (to be described)
to prepare for any possible unwanted switching. Initially Koji thought only c1vac2 can be rebooted. But it was wrong.
If the reset button is pushed, all of the modules on the same crate is reset. So everything was reset. After ~3min we still
don't have the connection to c1vac1 restored. We decided to another reboot. This time I pushed c1vac1 reset button.
After waiting about two minutes, the ADCs started to show green lights and the switch box started scanning.
We recovered the telnet connection to c1vac1 and epics functions. c1vac2 is still note responding to telnet, and
the values associated with c1vac2 are still blank.

Steve restored the valves and everything was back to normal.

Atm 1,  problem condition: gauges are not reading for a week, error message "NO COMM" and all computer LEDs are green

Atm 2, prepare to safe reboot:

            a, close V1, disconnect it's power cable and turn off Maglev, wait till rotation stops

            b, close PSL shutter ( take adrenaline if needed )

            c, close V4, V5, VA6 valves and disconnect their cables. "Moving" error message indicating this condition.

               V1 is not showing "Moving" because its power cable disconnected only! It will show it if its position indicator cable is disconnected too. There is no need for that.

               These valves closed and disabled will not allow accidental venting of main volume.

            d, push reset, reseting c1vac2 will reset c1vac1 also, wait ~ 6 minutes

"Vacuum Normal" valve configuration was restored after succesful reboot as follows:

             a, reconnect cable and open V4 and V5 at P2 & P3 <1e-1 Torr

             b, observe that P2  < 1e-3 Torr and retsart Maglev

             c, wait till Maglev reaches full speed of 560 Hz and reconnect-open V1

             d, reconnect-open VA6 at P3 <1e-3 Torr

NOTE: VM1 valve was locked in open position and it was not responding before and after reboot

          Error message on Atm2 is indicating this locked condition: "opening VM1 will vent IFO"

          This is a fauls message. The valve is frozen in open position. We need a softwear expert help.

 

 

ELOG V3.1.3-