Reinforced concrete grout plate for existing carbon steel stands at the ends.
The typical sign of a dying gas laser is that it glows for a few minutes only. The power supplies are fine.
Two new JDS - Uniphase 1103P lasers ( NT64-104 ) arriving on Monday, May 21
Yesterday I swapped in new He/Ne laser with output power 3.5 mW The return spot on qpd is large ~6mm in diameter and 20,500 counts
The spot size reduction require similar layout as ETMX oplev.
The oplev path is relayed and the spot size on the qpd is reduced. I still have to clean up and replace "Miki Mouse" lens holder.
There was no IP-ANG coming out of the chamber at this time!
I did relayed the oplev path with new f 500 mm lens
We can only decide the need of pitch damping when the coils are activated.
Could you tell us why? Are you thinking about induced current damping?
I was wrong The instability will be the same when the coils are actuated.
Yuta claims he fixed the PRM oplev by centering it the other day, but no one has left it on and watched it for a long while, to make sure it's okay. We watched it now for ~2 min, and it was good, but we're leaving the oplevs off anyway for the night. Tomorrow we should restore PRM (it's currently restored), turn on the oplevs, and let it sit to make sure it doesn't go crazy.
PRM oplev servo was turned on with PITgain 0.5 and YAWgain -0.7
Note: gain settings were PIT 1.0 and YAW --0.5 on Jun 1, 2012 that I measured Feb 23, 2012
It is still oscillating. Gains turned down to zero.
Earthquake test our suspensions PRM damping restored. Oplev servo gains turned to zero.
The PRM damping restored. Oplev PIT gain 0.15 and YAW gain -0.3 turned to zero.
But these jumps in the OSEMs are all at the level of 10-20 microns. Seems like that wouldn't be enough to account for anything; 20 microns / (pend length) ~ 50-60 microradians.
BS table and suspensions are fine.
SRM, ITMY and MC3 moved some what, but how are the TT? It may worth looking at them before we vent.
Recommended correction list:
1, refill- upgrade first aid boxes
2, maintain 18" ceiling to bookshelf clearance so the ceiling fire sprinklers are not blocked: room 101
3, label chilled water supply & return valves in IFO room
4, calibrate bake room hoods annually
5, update safety sign at fenced storage
40m still to do list:
1, clean and measure all safety glasses
2, annual crane inspection is scheduled for 8am March 19, 1013
3, make PSL encloser shelf earthquake proof
Do you see something that is not safe? Add it to this list please.
All safety glasses were cleaned in soapy water by Bob. I measured their transmission at 1064 nm, 150 mW, beam diameter 1.5 mm They are in working order, no transmission.
10 pieces of KG-5, fit over, from Laser Safety
4 pieces of KG-5, std size, from Drever Lab, best visibility
1 piece of KG-5 coated for visible, std size, from Kentek
15 pieces of green-plastic LOTG-YAG, fit over, from UVEX
7 pieces of green-plastic B-D+S 137, std areo fit, from Sperian
3 pieces of green-plastic, old Thorlab, fit over
2 pieces of green-plastic, fit over, from Laservision
8 pieces of braun- plastic, fit over, for green & IR protection, from UVEX & Thorlabs
Professional crane inspector: Fred Goodbar found two small leaks at the Vertex trolley as he was conducting the annual inspection of the 40m cranes. Otherwise the cranes are in safe condition.
Restocked First Aid Kits Location:
Main entrance, room 100
Drill press - above N2 cylinders, room 103
Control room, next to fire extinguisher, room 102
Vertex-north wall, IFO room 104
ETMY - right on ends light switches, IFO room 104_ east end
ETMX - on vertical I-beam of crane, IFO room 104_south end
Behind 1X3 Rack, on south wall - under instrument breakers panel PC-1, IFO room 104
Last thing remaining to be fixed from 2013 Safety Audit:
replace book shelf with 83" height
Updated laser inventory and operator list. They are posted in the 40m wiki and entry doors of the 40m IFO room.
Let me know if this list needs correction.
Lightwave M126N-1064-700 NPRO sn 337 in the PSL enclosure got connected to local emergency shut off switch. This is a LIGO operational safety requirement.
We had fire alarm tests and evacuation drills at 1:30pm yesterday. All flashers and horns are functioning unbearably loud and bright including clean assembly room.
All 40m laser safety glasses are cleaned and measured this morning. Bring your own safety glasses if you have to enter the 40m IFO room.
Glasses were washed in 1% Liquinox water solution and their transmission measured at 165 mW, 2 mm OD beam of 1064 nm
We had our annual safety inspection today. Our SOPs are outdated. The full list of needed correction will be posted tomorrow.
The most useful found was that the ITMX-ISCT ac power is coming from 1Y1 rack. This should actually go to 1Y2 LSC rack ?
Please test this so we do not create more ground loops.
Linus-1, Nodus and others ac cords can be moved over to new blank yellow extension cord with multiple recepticals.
Remove two red extension cords going to Smart UPS
CMG-40T handheld controller unit is missing its power supply. In order to zero the instrument one has to apply plus and minus DC voltage.
The wiring on this 10 pin Amphenol PT02E-12-10P is shown.
The IMC has not been behaving well since this morning and totally not happy when Q was finishing his measurements. The WFS servo had large offsets in pitch. Looking back at the trend and using ezcaservo to restore the suspensions did not help.
I realigned the IMC and brought TRANS SUM to ~18000 and MCREFL to < 0.5. The spot positions are not very good; nearly 2 mm off in pitch on MC1 and MC3. But after the alignment of MC, the WFS servo offsets were below +/-20.
The MC has been locked stably with WFS servo ON for the last few hours.
P.S. I did not touch the WFS pointing or reset the WFS offsets.
MC remained locked with WFS enabled all through last night and this morning. Koji dropped by and looked at the MC. The MC WFS servo, though stable, was at the edge of becoming unstable. This was because I did not touch the WFS pointing on the QPDs yesterday after realigning. So I recentered the WFS, reset the WFS filterbank offsets and reenabled the servo.
I measured the spot positions on MC mirrors for reference.
Spot positions in mm (MC1,2,3 pit MC1,2,3 yaw): [1.405767579680834, 0.79369009503571208, 1.3220430681427462, -1.2937873599406551, -1.1704264340968924, -1.2518046122798692]
Morning seconds without adjustment.
Annual crane inspection is scheduled for 8-11am Monday, March 17, 2014
The control room Smart UPS has two red extension cords that has to be removed: Nodus and Linux1
KroneCrane Fred inspected and certified the 3 40m cranes for 2014. The vertex crane crane was load tested at fully extended position.
Please take a look at the table top with the flashlight before removing it. If it is dusty, wipe it down with dry lint free cloth in the box.
There is one box with flash light and wiper at AP, ETMY & ETMX optical tables.
I'm checking the status from home.
P1 is 8e-4 torr
nodus did not feel the power outage (is it APS supported?)
linux1 booted automatically
c1ioo booted automatically.
c1sus, c1lsc, c1iscex, c1iscey need manual power button push.
9:11pm closed PSL shutter, turned Innolight 2W laser on,
turned 3 IFO air cond on,
CC1 5.1e-5 torr, V1 is closed, Maglev has failed, valve configuration is " Vacuum Normal " with V1 & VM1 closed, RGA not running, c1vac1 and c1vac2 were saved by UPS,
(Maglev is not connected to the UPS because it is running on 220V)
reset & started Maglev.........I can not open V1 without the 40mars running...........
Rossa is the only computer running in the control room,
Nodus and Linux1 was saved by UPS,
turned on IR lasers at the ends, green shutters are closed
It is safe to leave the lab as is.
Out gassing plus leak rate 0.15 mTorr / hour
The pressure rose to 2.5 mTorr in 17 hours
V1 was opened at 1:56pm
VM2 opened at 2:10 so the RGA region is back to 1e-5 torr
Last long extension cord removed from 1Y1 to ITMX-ISCT
The AC power strip at ITMX-ISCT is coming from wall L#26
Be aware that this may affect POP QPD and POP RF Thorlabs PD
CVI broadband AR coating was measured at the PSL-enclosure table around 9-10am today. The 2W Innolight first PBS S polarization beam was used with an other 1/2 wave plate and PBS.
W2-PW1-1004-C-633-1064-0 This 0.045" thick window has 0.7- 0.8 % reflected beam on each sides at 5 degrees of incidence, P polarization.
The specification is R avg <0.5 % per surface at 0 degree
Rana wants The device would be useless with such a high R, but R 0.1% is OK so I will get V coating.
Late adition: CHECK all viewport covers.
A, transparent Lexan sheet is protecting glass windows in a horizontal position
B, metal housing protection is required on each viewport except signal ports
C, signal ports should be shielded by optical table enclosure
We have to cover this window-camera with implosion proof cover or just remove it and blank it.
Question number 2: Do our vertically positioned windows with flip able covers require protective lexan ? NO 5-5-2014
CVI V-AR coating at 1064 nm, 0 degree, catalog item is R< 0.25% on each sides,
R <0.1 % is custom at much higher prices.
This custom order should go with other orders that has similar need.
From CVI: 5-6-2014
I checked the trace info on the W2-PW1-1004-C-633-1064-0, BBAR coated window that you received. It is side 1, 0.42%R & side 2, 0.53%R @ 1064nm. And with the shift, I’m not too surprised you ended up with 0.7%. A V coat would start with <0.25% (and more typically coming in at ~0.1%) per surface. As far as stock options, I have a 1”dia x 4mmT, fused silica window that is recorded as side 1, R=0.09 and Side 2, R=0.08% @ 1064. Is this too think or will it work for you?
Keven and Steve,
We cleaned around the Vertex chambers, PSL and MC2 floor areas.
Steve and I nicely routed the dolphin fiber from c1ioo in the 1X2 rack to the dolphin switch in the 1X4 rack. I shutdown c1ioo before removing the fiber, but still all the dolphin connected models crashed. After the fiber was run, I brought back c1ioo and restarted all wedged models. Everything is green again:
I put label at the dolphin fiber end at 1X2 today. After this I had to reset it, but it failed.
This is an effort to get rid of our ground loops by isolating the electronic components from the optical table.
Aluminum mounting base plates of Thorlabs BA2 and Newport B-2 were replaced by plates or post made out of delrin material.
This is an insulator. DELRIN base plates were installed 6 places. The oplev-qpd has Nylon base plate.
The NPRO and HE/NE lasers are not isolated from the table. S8 and S9
I'm not sure about the doubling oven S10
The optical table is grounded at G11 through ~1 Mohms to the ETMY chamber.
Alignment touch up needed at all D-marked component!
D: component delrin isolated
N: component nylon isolated ( or Delrin )
S: component shell is shorting to optical table (except oven)
G: optical table ground
I failed to maximize TRY the pds.
I worked at the ETMY-ISCT this morning and late afternoon. I will continue the 60 Hz noise hunt tomorrow.
Green light power decreased from 3 mW to 1 mW at the ETMX-ISCT shutter. More later.
Sanwiched wall as shown: 1" clear acrylic, 2 layers of 0.004" thick "window tint", 1 layer of 0.007" thermashield and 0.125" yellow acrylic
Visibility: 70 %, Transmission of 1064 nm 2-3 % at 0-50 degrees incident, power density ~ 0.7 W/mm2
Max power 100 mW
More details about this east end " acrylic + " enclosure ( optical table cover ) can be found elog entry 6210, 7194 and 7106
Window tinted layer transmission plot is below.
We have a film which may meet your requirements and the values are shown below:
Wavelength (nm) Transmission Reflectance(front) Reflectance (back)
1060 .0772 .604 .759
1070 .0723 .615 .772
These values are taken from the LBNL Optics 6 program and if you have access to that program, the NFRC ID for the film is 202. If you do not have access to the program, I have a captured the graph which may be of some help. I apologize for the appearance of the graph but someone at LBNL decided it would look better with a dark gray background – the yellow is the transmission curve, the blue is the reflectance (front) and the green is the reflectance (back).
The film is referred to as “Hilite 70” and has a 72% visible light transmission. These results were obtained with the film mounted on 1/8” clear glass.
Saint-Gobain Performance Plastics
Please consider your environmental responsibility before printing this email.
Electronic components should be ISOLATED as they are installed on the optical tables.
This is essential to avoid ground loops, 60 Hz and harmonic peaks in the spectrum. We have just got some made.
Please only use it for this reason. Earlier black delrin base plates were used up in not needed places.
The anodized Aluminum base plates with magenets certainly will conduct.
2014 surf students Nichin and Akhil received 40m specific basic safety training last week.
Andres Medina and Andrew "Harry" Hall received 40m specific safety training. They did general safety already and their laser safety training will be this after noon.
PSL, AP, ETMY and ETMX optical tables were scanned for stay beam.
The PSL HEPA was running at 30VAC-variac. It is 1 degree C warmer than usual. The HEPA fan motor turned up to 60 V
2005 ALL oplev servos use Coherent DIODE LASERS # 31-0425-000, 670 nm, 1 mW
Sep. 28, 2006 optical lever noise budget with DC readout in 40m, LIGO- T060234-00-R, Reinecke & Rana
May 22, 2007 BS, SRM & PRM He Ne 1103P takes over from diode
May 29, 2007 low RIN He Ne JDSU 1103P selected, 5 purchased sn: T8078254, T8078256, T8078257, T8078258 & T8077178 in Sep. 2007
Nov 30, 2007 Uniphase 1103P divergence measured
Nov. 30, 2007 ETMX old Uniphase 1103P from 2002 dies: .............., running time not known......~3-5 years?
May 19, 2008 ETMY old Uniphase 1103P from 1999 dies;.....................running time not known.....~ ?
Oct. 2, 2008 ITMX & ITMY are still diodes, meaning others are converted to 1103P earlier
JDSU 1103P were replaced as follows:
May 11, 2011 ETMX replaced, life time 1,258 days or 3.4 years
May 13, 2014 ETMX , LT 1,098 days or 3 y
May 22, 2012 ETMY, LT 1,464 days or 4 y
Oct. 5, 2011 BS & PRM, LT 4 years, laser in place at 1,037 days or 2.8 y
Sep. 13, 2011 ITMY old 1103P & SRM diode laser replaced by 1125P ..........old He life time is not known, 1125P in place 1,059 days or 2.9 y
June 26, 2013 ITMX 622 days or 1.7 y note: we changed because of beam quality.........................laser in place 420 days or 1.2 y
Sep. 27, 2013 purchased 3 JDSU 1103P lasers, sn: P893516, P893518, P893519 ......2 spares ( also 2 spares of 1125P of 5 mW & larger body )
May 13, 2014 ETMX, .............laser in place 90 d
May 22, 2012 ETMY,
Oct. 7, 2013 ETMY, LT 503 d or 1.4 y............bad beam quality ?
Aug. 8, 2014 ETMY, .............laser in place 425 days or 1.2 y
Sep. 27, 2013 purchased 3 JDSU 1103P lasers, sn: P893516, P893518, P893519 ......2 spares ( also 2 spares of 1125P of 5 mW & larger body )
Sept. 5, 2014 new 1103P, sn P893516 installed at SP table for aLIGO oplev use qualification
Small oil drops were found during prevent inspection of the vertex crane. They were wiped off. It took 231 days to grow this size.