40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 283 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject
  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.
 
 
 
 
  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.

  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.

  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. 

  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.

  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.

  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.

 

  6222   Wed Jan 25 15:04:41 2012 JenneBureaucracySAFETY40m SOS supplies moved off of cleanroom flow bench

Bob, Callum and Daphen noted that our keeping a JDSU HeNe (max power <4mW) is against somebody's SOP.  So I cleared everything that relates to 40m SOS suspending to the bottom shelf of the 2nd cabinet in the cleanroom (the back set of cabinets nearest the flow benches).  The door has a nifty label.  Things that are in there include:

HeNe

HeNe mount

QPD and micrometer mount

microscope and micrometer mount

iris

Al beam block

Magnet gluing fixture

dumbbell gluing fixture

The electronics that we use (HeNe's power supply, 'scope, QPD readout) are still on the roll-y thing under the flow bench.

  6226   Thu Jan 26 08:36:38 2012 steveUpdateSAFETYevacuation drill

It started with fire alarm test yesterday at 14:50 All alarms are  functioning VERY loud and their flashers are bright. Evacuation drill followed. We assembled at north west corner of the 40m building and counted 6 heads.

Nobody was left sleeping inside. Bob carried the success report of the drill to PMA office immediately.

  6308   Thu Feb 23 09:09:33 2012 steveUpdateSAFETYsafety checks

Emergency exit lights were inspected:  2 out of 13 batteries have to be replaced

One of the Halon fire extinguishers needs to be recharged out of 8

Please do participate in preparation for the upcoming safety audit on Feb 28

  6322   Mon Feb 27 10:21:37 2012 steveUpdateSAFETYsafety audit tomorrow morning

Quote:

Emergency exit lights were inspected:  2 out of 13 batteries have to be replaced

One of the Halon fire extinguishers needs to be recharged out of 8

Please do participate in preparation for the upcoming safety audit on Feb 28

 Batteries replaced and cylinder recharged. Please clean up your experimental set up if it is blocking breakers or entry way etc.

I will start the final clean up 2pm today.

 

  6329   Tue Feb 28 11:20:51 2012 steveUpdateSAFETYsafety audit 2012

Correction list by visiting safety committee, Haick Issaian is not shown:

1,  update laser, crane operator list and post it

2,  check fire extinguishers monthly, date and initials must be on the tags

3,  move drinking water tower so it does not block fire extinguisher

4,  post updated crane doc at cranes

5,  post present phone lists at IFO room phones

6,  emergency laser shutoff at the south end must be mounted without C-clamp

7,  use heavy cable tie to insure position of  mag-fan on cabinet top

 

Additional to do list:

a,  safety glasses to be cleaned

b, let the electrical shop fix Rack-AC power to optical tables at the ends

c, measure transmission of  laser safety glasses

d, update  IFO outside door info signs

e, update laser inventory and post it

f,  schedule annual crane inspection and renew maintenance contract

g, PSL enclosure  inner shelf needs a good clean up so it is earthquake safe

 

  6347   Fri Mar 2 16:05:52 2012 DenUpdateSAFETYlaser safety

Today I've attended the laser safety seminar.

  6432   Wed Mar 21 10:31:28 2012 steveUpdateSAFETYAC power to ETMY turned off

ETMY sus damping was disabled. Green locking laser and associated electronics turned off. Computers and power supplies turned off at rack 1Y4

The electricians picking up ac power from 1Y4 manual disconnect box and installing conduit line to ISCT-ETMY east end optical table.

There will be no more daisy chaining this way. 

  6433   Wed Mar 21 11:32:47 2012 steveUpdateSAFETYAC power to ETMX turned off

Quote:

ETMY sus damping was disabled. Green locking laser and associated electronics turned off. Computers and power supplies turned off at rack 1Y4

The electricians picking up ac power from 1Y4 manual disconnect box and installing conduit line to ISCT-ETMY east end optical table.

There will be no more daisy chaining this way. 

 The power is back on at ETMY . c1iscey has not been restarted.

Now I'm turning ac power off at ETMX for the same job to be done.

  6469   Fri Mar 30 08:58:37 2012 steveUpdateSAFETYSafety glasses checked

Bob cleaned all safety glasses in 10 % Liquinox soap in water solution first.  The  transmittance of glasses were checked at 100 mW 1064 nm S polarization, beam diameter  0.5 mm at 0-20 deg incident.

Coherent FieldMate power meter measured T= < 1 mW of all glasses.

  6470   Fri Mar 30 09:37:13 2012 steveUpdateSAFETYsafety audit 2012 CORRECTIONS

Quote:

Correction list by visiting safety committee, Haick Issaian is not shown:

1,  update laser, crane operator list and post it

2,  check fire extinguishers monthly, date and initials must be on the tags

3,  move drinking water tower so it does not block fire extinguisher

4,  post updated crane doc at cranes

5,  post present phone lists at IFO room phones

6,  emergency laser shutoff at the south end must be mounted without C-clamp

7,  use heavy cable tie to insure position of  mag-fan on cabinet top

 

Additional to do list:

a,  safety glasses to be cleaned

b, let the electrical shop fix Rack-AC power to optical tables at the ends

c, measure transmission of  laser safety glasses

d, update  IFO outside door info signs

e, update laser inventory and post it

f,  schedule annual crane inspection and renew maintenance contract

g, PSL enclosure  inner shelf needs a good clean up so it is earthquake safe

 

 Completed with the exception of d and g

  6848   Thu Jun 21 15:00:55 2012 steveUpdateSAFETYSURFs 2012 safety training

Masha, Eric, Yaakov, Liz and Sasha received 40m specific basic safety training.

  7154   Sun Aug 12 01:21:26 2012 steveUpdateSAFETYexit door left unlocked

Caltech security called me at 1am Sunday. Control room emergency exit door was found unlocked!

It is your responsibility to lock door if you unlocked it !

 

  7155   Sun Aug 12 10:34:45 2012 KojiUpdateSAFETYexit door left unlocked

I unlocked the door on Tuesday in order to move the red cart.
After that I confirmed that the door was locked.

Quote:

Caltech security called me at 1am Sunday. Control room emergency exit door was found unlocked!

It is your responsibility to lock door if you unlocked it ! 

 

  7207   Thu Aug 16 18:59:18 2012 JenneUpdateSAFETYEmergency Exit door unlocked again

Koji just found the emergency exit door unlocked again.  NOT GOOD.

We have determined that if you use the emergency door to enter the lab, it leaves the door unlocked, unless you go back outside and deliberately lock it.  This means that someone has been using the emergency exit as a regular entrance. 

It's fine to leave by that door, but you should make a habit of entering through the regular door.  Using the back door as an entrance is a special case situation, when they have the main door blocked.

  7285   Mon Aug 27 15:46:55 2012 SteveUpdateSAFETYsafety training

 Rijuparna Chakraborty and Elli Elenora King received 40m specific  basic safety training in the 40mLab

  7374   Wed Sep 12 11:33:49 2012 SteveUpdateSAFETYsafety training

Eric Quintero and Mike Jenson received 40m specific basic safety training.

  7467   Wed Oct 3 11:43:33 2012 SteveUpdateSAFETYsafety training

Den Martynov received 40m specific safety training.

  7508   Mon Oct 8 23:58:57 2012 JenneUpdateSAFETYControl room emergency lights came on

[Evan, Jenne]

We were sitting trying to lock MICH (hooooorraaaayy!!!), and the emergency lights above the control room door came on, and then ~1 minute later turned off.  Steve, can you see what's up?

  7559   Tue Oct 16 17:06:47 2012 SteveUpdateSAFETYsafety training

Ayaka Shoda, visiting graduate student received basic 40m specific safety training today

  7725   Mon Nov 19 15:58:02 2012 SteveUpdateSAFETYsafety training

Charles Blakemore  our new undergrad help received 40m specific safety training today.

ELOG V3.1.3-