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  40m Log, Page 279 of 339  Not logged in ELOG logo
ID Date Author Type Categoryup Subject
  2087   Mon Oct 12 20:01:13 2009 KojiConfigurationSAFETYStray beam blocking

OK! I saw the optics are redundant and some of the components are not in a right place.
I will talk with you when you are back such that we can keep the usefulness of the setup.

Quote:

 These components are from when Rana and I used the StochMon PD to do the RFAM tuning, documented in elog 1926.  This was a very handy measurement, but I'm not sure if whether or not we need it often enough to keep the optics there.

 

  2115   Mon Oct 19 11:00:52 2009 steveHowToSAFETY40m safety training

Kiwamu, Alex and Zach are practicing mandatory IR-safety scan at the 40m-PSL

40m specific safety indoctrination were completed.

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  2130   Wed Oct 21 16:18:12 2009 SteveSummarySAFETYLIGO Safety Officers visited the 40m

David Nolting, chief LIGO Safety Officer and his lieutenants from LLO and LHO paid homage to the 40m lab this morning.

They give us a few recommendation: update safety documents, move optical table from the front of ETMX-rack and label-identify absorbent plastics on enclosure windows-doors.

We'll correct these short comings ASAP

 

  2482   Wed Jan 6 16:48:52 2010 steveBureaucracySAFETYcopied NPRO key

We lost our key to the Lightwave 125/6-OPN-PS   The key shop just made one look a like that works.

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  2647   Mon Mar 1 08:49:37 2010 steveBureaucracySAFETYsafety audit

The 40m safety audit will be at Wednesday afternoon, March 3

Please participate getting our lab to inspection grade safety level.

  2716   Fri Mar 26 10:48:35 2010 steveUpdateSAFETYsafety glasses measured

Safety glasses 1064 nm transmission measured at ~200 mW level. They are all good.

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  2814   Tue Apr 20 09:15:15 2010 steveSummarySAFETYannual safety audit
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  2815   Tue Apr 20 10:55:10 2010 steveBureaucracySAFETYKevin Kuns received safety training

The 40m's new undergrad Kevin Kuns was introduced to 40m safety hazards. He is new and needs guidance as specially with 2W laser work.

Peter King will train him on Friday to LIGO-laser standard.

 

  2943   Tue May 18 11:54:29 2010 steveConfigurationSAFETYpsl mechanical shutter is not working

As we learned yesterday, the PSL laser power out put mechanical shutter is not working in the remote mode. It only works in local manual mode.

Do not rely on the MEDM screen monitor readout! The position is only changing on the monitor. The main beam must be blocked before the output periscope.

  2947   Tue May 18 15:09:02 2010 steveConfigurationSAFETYPSL output shutter in order again

Quote:

As we learned yesterday, the PSL laser power out put mechanical shutter is not working in the remote mode. It only works in local manual mode.

Do not rely on the MEDM screen monitor readout! The position is only changing on the monitor. The main beam must be blocked before the output periscope.

Ben found the Sorenson 5V ps off. It was turned off since our last scheduled power outage. I wonder what else is running on 5V in the PSL? This power supply should be on the

"alarm handler"  list to avoid future repeat of this condition. However a real safety switch would have confirming position sensors of the shutter open or closed. Is there such thing at the sites?

  2961   Thu May 20 20:03:37 2010 JenneUpdateSAFETYDon't walk down the Y(new convention) arm tonight!

Please don't go down the Yarm (Old Xarm) for right now, or if you do, please be very careful.  Kiwamu and I are set up to take beam scan measurements down the walkway, and so there are some cables / carts / other stuff down there.  We are going to get dinner really quickly before beginning the measurements. 

Right now, the PSL shutter is Closed, so there is no beam hazard outside of the chambers, just crowded space hazard.

  2962   Fri May 21 00:21:24 2010 JenneUpdateSAFETYDon't walk down the Y(new convention) arm tonight!

All clear.

Quote:

Please don't go down the Yarm (Old Xarm) for right now, or if you do, please be very careful.  Kiwamu and I are set up to take beam scan measurements down the walkway, and so there are some cables / carts / other stuff down there.  We are going to get dinner really quickly before beginning the measurements. 

Right now, the PSL shutter is Closed, so there is no beam hazard outside of the chambers, just crowded space hazard.

 

  3058   Wed Jun 9 10:31:13 2010 steveUpdateSAFETYsafety training

Nancy and Sharmila received introductory early bird surf safety training for the 40m lab.

  3121   Fri Jun 25 15:22:45 2010 JenneOmnistructureSAFETYNo entry to the 40m LVEA until further notice!

                                                                                                                                                                                                                                                                               

The 40m corner station crane is out of order, and it's stuck in a way that prohibits entry to the 40m LVEA / IFO room for safety.  The crane has been locked out / tagged out. 

Until further notice, absolutely no one may enter the 40m LVEA.  Work is permitted in the desk / control room areas.

Signs have been posted on all doors into the LVEA.  Please consider those doors locked out / tagged out.

                                                                                                                                                                                                                                                                               

  3133   Tue Jun 29 11:48:17 2010 JenneConfigurationSAFETYBack in LASER HAZARD mode.

[Steve, Kiwamu, Jenne]

The 40m is now back in Laser Hazard mode.  Safety glasses are required for entry into the LVEA / IFO room.

  3135   Tue Jun 29 14:16:35 2010 KojiConfigurationSAFETYBack in LASER HAZARD mode.

The insects and the laser trouble... Strange coincidences with LHO surprised me, but now I have been relieved.

Quote:

[Steve, Kiwamu, Jenne]

The 40m is now back in Laser Hazard mode.  Safety glasses are required for entry into the LVEA / IFO room.

 

  3150   Wed Jun 30 18:16:55 2010 steveUpdateSAFETYSURF safety training 2010

40m SURFs Razib Obaid, Nancy Aggarwal, Unknown Bearded SMURF, Megan Daily, Gopal Nataraj, Katharine Larson and Sharmila Dhevi received 40m specific safety training on June 23, 2010.

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  3169   Wed Jul 7 17:05:30 2010 steve, ranaUpdateSAFETYSummary of Crane Damage/Malfunction

The 1 Ton yellow crane support beam jammed up at Friday morning, June 25.

 

The 40m vertex crane has a folding I-beam support to reach targeted areas. The rotating I-beam is 8 ft long. The folding extension arm gives you another 4 ft.

The 12 ft full reach can be achieved by a straightening of the 4 ft piece. There is a spring loaded latch on the top of the I-beam that locks down when the two I-beams align.

This lock joins the two beams into one rigid support beam for the jib trolley to travel.  The position of this latch is visible when standing below, albeit not very well.

To be safe it is essential that this latch is locked down fully before a load is put on the crane.

 

We were preparing to pump down the 40m vacuum system on Friday morning. The straight alignment of the 8 and 4 ft piece made us believe that

the support beams were locked. In reality, the latch was not locked down. The jib trolley was driven to the end of the 12 ft I-beam. The 200 lbs ITM-east door was lifted

when the 4 ft section folded 50 degrees around the pivot point. This load of door + jib-trolley + 4 ft I-beam made the support beam sag about 6 inches

The door was removed from the jib hoist with the blue Genie-lift. The sagging was reduced to ~3".

 

The Genie-lift platform was raised to support the sagging crane jib-trolley. The lab was closed off to ensure safety and experts were called in for consultation. It was decided to bring in professional riggers.

 

Halbert Brothers, Inc. rigging contractor came to the lab Tuesday morning to fix the crane. The job was to unload the I-beam with safety support below. They did a very good job.

 

The static deformation of I-beams sprung back to normal position. There are some deformation of the I-beam ~2 mm where the beams were jammed under load.

It is not clear if this is a new deformation or if the crane sections have always been mis-aligned by a couple of mm.

 

The crane was tested with 450 lbs load at 12 ft horizontal travel position. The folding of I-beams were repeatedly tested for safe operation. Its a 1 ton crane, but we tested it with 450 lbs because that's what we had on hand.

 

We're working on the safety upgrade of this lift to prevent similar accident from happening.

Pictures below:

Atm 1)   load testing 2007

Atm 2)   jammed-sagging under ~400 lbs, horizontal          

Atm.3)   jammed-folded 50 degrees, vertical     

Atm.4)   static deformation of I-beams

Atm.5)   unloading in progress with the help of two A-frames          

Atm.6)   it is unloaded

Atm.7-8) load testing        

Atm.9)   latch locked down for safe operation            

Atm.9)   zoom in of the crane sections misalignment    

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  3279   Fri Jul 23 16:00:35 2010 steveUpdateSAFETYcrane load test tomorrow

All 3 cranes will be load tested at 1 ton tomorrow morning between 9am and 2pm

Do not come to the 40m lab during this period. We may disturb your experiment.

Please prepare your touchy set ups to take this test.

  3311   Wed Jul 28 14:54:56 2010 steveUpdateSAFETYevacuation drill at the 40m

Head count at the evacuation drill today. I checked  alarms and flashers  at room 104,102,101, 103, 105 and 107. They were really loud and bright. 

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  3514   Thu Sep 2 16:41:32 2010 steveConfigurationSAFETYlaser is ON: safety glasses required!

I hooked up interlock to the Innolight 2W 1064 nm in the enclosure. The manual shutter  is closed on this unit.

SAFETY GLASSES REQUIRED !

  3549   Thu Sep 9 08:23:45 2010 steveUpdateSAFETYmain laser turned off

Innolight 2W 1064nm main laser was turned off for more enclosure related work.

The electrician re rooting the power- conduit to the interlock under the floor and bring it through the new concrete tunnel.

Emergency laser power shut off switch was tested at entry door 104M.  It worked fine.

 

No laser glasses required. Laser will be turned back on around 11 am today.

  3550   Thu Sep 9 11:17:15 2010 steveUpdateSAFETYmain laser is back ON

Quote:

Innolight 2W 1064nm main laser was turned off for more enclosure related work.

The electrician re rooting the power- conduit to the interlock under the floor and bring it through the new concrete tunnel.

Emergency laser power shut off switch was tested at entry door 104M.  It worked fine.

 

No laser glasses required. Laser will be turned back on around 11 am today.

Atm1,   AC power line to enclosure and interlock  was extended.

Atm2,   24V line to interlock rerouted

Atm3,   job is completed

 

SAFETY GLASSES REQUIRED !  SAFETY GLASSES REQUIRED!

 

 The laser is turned on. Injection current set to 0.871A.

Actually some one turned the  laser  off last night and did  not enter it into the elog ! Burned toast award is granted !

Please  come forward voluntarily.

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  3554   Thu Sep 9 16:54:56 2010 ranaUpdateSAFETYmain laser is back ON

I turned off the laser last night to protect against the electricians. but failed to elog it. I accept the burnt toast completely.

  3626   Thu Sep 30 13:43:29 2010 steveUpdateSAFETYpropane gas smell in control room

The control room's north west corner smelled like propane gas  yesterday around 16:30

We all agreed that the smell was real and I called the safety office. I was told that they received 6 other calls from different parts of the campus.

The smell disappeared in about a half an hour.

  3637   Fri Oct 1 16:46:20 2010 steveBureaucracySAFETYYuta received 40m-101-safety training

Our visiting graduate student Yuta Michimura received 40m specific basic safety training today.

  3664   Thu Oct 7 08:39:39 2010 steveBureaucracySAFETYJoonho receives safety training

Our new undergrad Joonho Lee received 40m specific basic safety training yesterday.

Yuta and Joonho are scheduled to participate in the LIGO-laser safety tutelage with Peter K on Oct 12

  3676   Fri Oct 8 07:41:42 2010 steveConfigurationSAFETY2W laser shutter is closed

The 2 W Innolight shutter is closed and enclosure door removed. Beam path blocked. Do not change this condition.

  3677   Fri Oct 8 10:38:03 2010 steveConfigurationSAFETY2W laser shutter is closed

Quote:

The 2 W Innolight shutter is closed and enclosure door removed. Beam path blocked. Do not change this condition.

The PSL output beam guide was upgraded from 2" to 8" OD . It is green ready. Shutter is open.

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  3697   Tue Oct 12 15:51:18 2010 yutaBureaucracySAFETYthe 40m squad received safety training from Peter

Yuta, Joonho, and Suresh received the Basic Laser Safety Training from Peter King today.

Now, we got homework.

  3833   Mon Nov 1 10:28:41 2010 steveBureaucracySAFETYSuresh received 40m safety training

Our new postdoc Suresh Doravari received 40m specific safety training last week.

  4264   Wed Feb 9 10:25:46 2011 steveUpdateSAFETYAP table

I blocked the  AP table's south west 10" ID port since it is obsolete with the new layout.

Reminder: items on the enclosure self can fall down in an earthquake. I moved oscilloscope and heavy calorimeter head from the edge of the cliff.

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  4286   Mon Feb 14 11:23:24 2011 steveUpdateSAFETYenclosure door upgrade

The #3 enclosure door was removed for the carpenter shop this morning. They will make 5 full size doors with window on each.

TEMPORARY aluminum sheet is clamped into its place. This sheet should not be removed till new doors arrive.

The inside Formica color will be changed from white to black to reduce the green scattering.

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  4338   Tue Feb 22 14:37:24 2011 steveUpdateSAFETYLarisa received 40m safety training

Larisa Thorne received 40m lab specific, basic safety training. She will attend P. King's Basic Laser Safety Training Session tomorrow.

 

  4356   Fri Feb 25 10:11:56 2011 steveUpdateSAFETYhow not to

The beam of IR for doubling  is clipping on bnc cable to green beam transmitted pd.

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  4418   Mon Mar 21 16:31:02 2011 steveUpdateSAFETYBryan Barr received safety training

Bryan Barr is visiting us from Glasgow for a month. He received 40m specific safety training on Friday.

  4487   Tue Apr 5 17:04:36 2011 steveSummarySAFETYcranes inspected and load tested

Mike Caton of Konecranes inspected and loadtested all 3  of the 40m cranes at max reach trolley positions with 1 ton.

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  4497   Thu Apr 7 11:51:13 2011 steveSummarySAFETYnew crane operator inaugurated

Quote:

Mike Caton of Konecranes inspected and loadtested all 3  of the 40m cranes at max reach trolley positions with 1 ton.

 Konecrane representative gave crane operator training in the 40m. Koji has become a qualified, trained crane operator of the 40m lab.

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  4651   Fri May 6 10:20:00 2011 steveSummarySAFETY2011 safety audit

The emphasis of this annual safety audit  was on  safe  electrical housekeeping on March 3, 2011

Safety audit correction list for the electric shop:

1, install breaker panel door in room 101
2, install conduit- AC out let in the east arm for USB camera table and
    south arm for maglev- external fan
3, replace AC cord to south end work bench and door alarm
4, trace breaker of 1Y4

Requested completion date: 3-28-2011 at estimated cost $1,500.
 
All recommendations  for improvement were done by April 1, 2011
 
We thank the participants for making the 40m a safer  place to work.
 
 
 
 
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  4771   Tue May 31 11:34:13 2011 steveSummarySAFETYsafety glasses checked

  1064 nm transmison were measured of 40m safety glasses as shown . Their performance did not degrade. They are as good as their labels.

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  4847   Tue Jun 21 16:11:13 2011 steveUpdateSAFETYsurf safety training

40m surfs:  Nicole Ing, Iswita Saikia and Sonali Mohapatra received 40m specific safety training  today.

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  4903   Tue Jun 28 22:07:46 2011 JamieHowToSAFETYEurocrate extender card fried (ie. Jamie did a very bad thing)

IMPORTANT ELECTRONICS SAFETY LESSON TO FOLLOW

Yesterday, I fried the +15 V power supply rail on one of the Eurocrate extender cards while I was checking out the binary switching in the 1X5 rack.  I will describe what I did it in the hopes that everyone else will be less stupid than me.

I wanted to monitor the voltage across a resistor on the suspension OSEM whitening board.  Since I knew that both sides of the resistor would be at non-zero voltage (including possibly at the power-supply rail), I used a battery-operated scope with floating inputs, so that the scope would not try to pull the probe shield to ground.  That should be OK, although not recommended, as you'll see, because you must be very careful to make sure that the scopes inputs are indeed floating.

Let's call the original signal 'A'.  The trouble came when I then connected another signal (B), whose shield was connected to the ground on the whitening board, to the scope.  Apparently the grounds on the scope inputs are connected, or were in the configuration I was using.  When I connected the signal B, B's ground shorted A's shield to ground, which had been sitting at the +15V rail.  That short circuit then fried the +15V supply line on the extender card I was using (escaping magic smoke was detected).  Thankfully this only blew the extender card, and not the Eurocrate or the Eurocrate power supply or the whitening board or the scope etc, all of which would have been much worse.

The moral of the story is to be very careful when connecting power supply voltages to the shield or ground of a scope.  In short, don't do it.  I didn't ultimately need to, since I could have found other ways to measure the same signal.

 

  4924   Thu Jun 30 17:24:46 2011 steveUpdateSAFETYsafety interlocks

Lightwave M126-1064-700 lasers  sn415  at east end of the Y arm and  sn201 at the AP table  are connected individually  to one each EMERGENCY LASER SHUT OFF SWITCH. 

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  4953   Thu Jul 7 13:57:28 2011 steveHowToSAFETYhow not to

I found baked allen keys on the top of the clean optics cabinet.  Somewhat heavy box that can come down in an earthquake on our heads.

NOTHING SHOULD GO ON THE TOP OF THE CABINETS OR RACKS except  small plastic boxes that storing our clean clothing.

  4986   Mon Jul 18 22:26:43 2011 NicoleUpdateSAFETYPainful Voltage Regulator and Circuit-Testing Lessons

Today I learned some important circuit-building lessons while testing my photosensor circuit box (i.e. how NOT to test a circuit and, conversely, things that should be done instead). 

I blew my first circuit today. The victim is in the photo below (bottom 7805 voltage regulator). The plastic covering fell off after I removed the fried regulator.  After checking various components, I figured out that I blew the circuit because I had forgotten to ground the regulator.  Although this was very unfortunate, I did make an important discovery. While testing the voltage output of the 7805 voltage regulator (I put a new one), I discovered that contrary to the claims of the datasheet, an input voltage of 5V will not produce a steady 5V supply. I found that at 5V, my regulator was only producing 4.117 V. I was using a 5 V supply because I wanted to use only 1 power supply (I was using a two-channel power supply that had a fixed 5V output to produce the +15, -15, ground, and 5 V I need for my photosensor circuit box).  After seeing this, I got a second power supply and am now using 10V to as an input for the regulator to produce 4.961V. I found that from a voltage range of 10V to 15 V, the regulator produced a steady  4.961 V supply. I have decided to use 10V as an input. My newly-grounded voltage regulator did not smoke or get hot at 10V.

After several more debugging trials (my LED was still not lighting up, according to the infared viewer), I learned another painful lesson. I learned DO NOT USE CLIP LEADS TO TEST CIRCUITS!!!! Initally, I was powering my circuit and making all of my connections between the photosensor head (2 photodiodes and 1 LED) with clip leads. This was a BAD IDEA BECAUSE CLIP LEADS ARE UNSTABLE AND IT IS VERY EASY TO SHORT A CIRCUIT IF THEY ACCIDENTALLY TOUCH! I did not realize this important lesson until my photosensor circuit was once again burning. Confused as to why my circuit was once again burning, I foolishly touched the voltage regulator. As you can see on the top voltage regulator in the photo below, my finger left its mark on the smoldering voltage regulator. As you cannot see the wincing on my face as I try to type this long elog, I will painfully type that the voltage regulator left its own mark on my finger (an ugly sore little welt).  Suresh has taught me a valuable lesson: WHEN DEALING WITH SOMETHING OF QUESTIONABLE/UNKNOWN TEMPERATURE, USE YOUR NOSE, NOT YOUR FINGER TO DETERMINE IF THAT COMPONENT IS HOT!!!! 

P7180424.JPG

 

To make my circuit-testing safer, upon the suggestion of Suresh, I have since removed the clip leads and inserted a 12 pin IDC component (pictured below). There are 12 pins for the 6 inputs I will get from each of the 2 photosensor heads. I have requested orders for a 16 pin IDC connector, 15 pin Dsub male part, 15 pin Dsub feed-thru, 9 pin Dsub male part (2), and 9 pin Dsub feed-thru (2). After receiving these components, I should be able to safely test my circuit.

P7180423.JPG

 In the meanwhile, I can explore SimMechanics and try to figure out how to use the accelerometer

  4990   Tue Jul 19 13:45:22 2011 SureshUpdateSAFETYPainful Voltage Regulator and Circuit-Testing Lessons

There is should be a few IDC connectors in the lab (and some ribbon cable) using which you can proceed with the testing of the circuit, if you prefer.  If not we can get them from our ever helpful electronics division at Downs.  In any case there is no need to lose time waiting for parts to arrive.

 

  5050   Wed Jul 27 15:49:56 2011 steveUpdateSAFETYManuel receives safety training

Our surf student Manuel Marchiò received 40m specific safety training today.

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  5090   Tue Aug 2 10:53:03 2011 JenneOmnistructureSAFETYRegular door out of service. Use Control Room Door only!!

The hazardous waste people are moving chemicals around outside our door, and have roped off our regular front door. 

Please go around, and use the control room door to enter and exit.  It is currently unlocked, although I'll lock up when I leave for LIGOX.

  5434   Fri Sep 16 16:07:28 2011 steveUpdateSAFETYvisitors safety training

Paul, Mirko and Katrin visiting grad students received the 40m basic safety training.

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  5712   Thu Oct 20 12:43:19 2011 steveUpdateSAFETYrefilled first aid kits & their locations

First aid kits are located close vicinity of entry doors and under circuit breaker panels.

 

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ELOG V3.1.3-