ID |
Date |
Author |
Type |
Category |
Subject |
4771
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Tue May 31 11:34:13 2011 |
steve | Summary | SAFETY | safety 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. |
Attachment 1: P1070823.JPG
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2716
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Fri Mar 26 10:48:35 2010 |
steve | Update | SAFETY | safety glasses measured |
Safety glasses 1064 nm transmission measured at ~200 mW level. They are all good. |
Attachment 1: P1060188.JPG
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Attachment 2: P1060199.JPG
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10201
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Tue Jul 15 11:04:05 2014 |
Steve | Update | safety | safety glasses must be worn all times! |
This is the third safety glasses that I found laying around in the IFO lab lately. Safety glasses must be worn ALL times in the IFO room!
This rule is essential for your protection! Please do not enter if you can not put up with this regulation!
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Attachment 1: safetyglasses.jpg
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840
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Fri Aug 15 14:12:31 2008 |
steve | Bureaucracy | SAFETY | safety glasses required |
The MOPA shutter is opened,
the PSL enclosure is switched to bypass mode,
manual block removed from PMC,
the PSL output is still blocked and the mechanical shutter is still closed.
Pumpdown is at 300 Torr continuing
Laser safety glasses are required! |
866
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Thu Aug 21 16:28:59 2008 |
steve | Configuration | SAFETY | safety glasses required |
I just opened the MOPA shutter so PA is warming up.
High power beam path is cleared and laser safety glasses required. |
1288
|
Tue Feb 10 10:48:48 2009 |
steve | Bureaucracy | SAFETY | safety glasses scanned |
All 40m safety glasses are absorbent.
They were scanned by 180 mW 2mm spot size of 1064 nm beam and their transmissions were measured
They showed no degradation.
UVEX 's LOTG-YAG/CO2 glasses (fits over personal glasses) 11 pieces,
Glendale-XC by Bacou-Dalloz, #1166218VLT68% , aerodynamic style, 7 pieces, (4 missing )
KG5- glasses , heavier- made out of glass, 3 pieces,
Thorlab's LG10, 1 piece
Old glasses by "Laser Glass" Nd-YAG, 2 pieces
Totaling 24
Atm.2 showing our muilty wavelength glasses of 1064 and 530 nm
Their transmittance for both wavelength were zero.
Note: if you have prescripton safety glasses I would like to scan it for you !
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Attachment 1: sgscan1.png
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Attachment 2: sgscan2.png
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4924
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Thu Jun 30 17:24:46 2011 |
steve | Update | SAFETY | safety 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. |
Attachment 1: P1070949.JPG
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Attachment 2: P1070948.JPG
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12082
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Tue Apr 19 10:58:53 2016 |
Steve | Update | safety | safety scans at PSL & tables |
The PSL had one 1064 nm beam to be blocked around the north east side. The end enclosures are fine.
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942
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Thu Sep 11 14:27:53 2008 |
steve | Bureaucracy | SAFETY | safety training |
Peter Kalmus received 40m specific safety training last week. |
1243
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Thu Jan 22 08:34:10 2009 |
steve | Bureaucracy | SAFETY | safety training |
Kakeru received 40m safety training yesterday.
He has no authorization to work alone in the high power beam path yet. |
3058
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Wed Jun 9 10:31:13 2010 |
steve | Update | SAFETY | safety training |
Nancy and Sharmila received introductory early bird surf safety training for the 40m lab. |
7285
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Mon Aug 27 15:46:55 2012 |
Steve | Update | SAFETY | safety training |
Rijuparna Chakraborty and Elli Elenora King received 40m specific basic safety training in the 40mLab |
Attachment 1: IMG_1597.JPG
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7374
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Wed Sep 12 11:33:49 2012 |
Steve | Update | SAFETY | safety training |
Eric Quintero and Mike Jenson received 40m specific basic safety training. |
7467
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Wed Oct 3 11:43:33 2012 |
Steve | Update | SAFETY | safety training |
Den Martynov received 40m specific safety training. |
7559
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Tue Oct 16 17:06:47 2012 |
Steve | Update | SAFETY | safety training |
Ayaka Shoda, visiting graduate student received basic 40m specific safety training today |
Attachment 1: IMG_1735.JPG
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7725
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Mon Nov 19 15:58:02 2012 |
Steve | Update | SAFETY | safety training |
Charles Blakemore our new undergrad help received 40m specific safety training today. |
8241
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Wed Mar 6 16:14:27 2013 |
Steve | Update | SAFETY | safety training |
Chloe Ling, Max Horton and Annalisa Allocca have received basic 40m specific safety training. |
Attachment 1: IMG_500.jpg
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8503
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Mon Apr 29 08:22:57 2013 |
Steve | Update | SAFETY | safety training |
Albert, our new undergrad work force received 40m specific- basic safety training last week. Please read and sign 40m procedures booklet. |
8670
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Tue Jun 4 10:47:57 2013 |
Steve | Update | safety | safety training |
Our early bird surf student Gautem has received 40m specific basic safety training today. |
10007
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Mon Jun 9 09:41:06 2014 |
steve | Update | safety | safety training |
2014 surf students Nichin and Akhil received 40m specific basic safety training last week. |
Attachment 1: 2014surfs.jpg
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10138
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Mon Jul 7 14:38:55 2014 |
Steve | Update | safety | safety training |
TaraV - geology major undergrad - of Jenne's summer help received 40m specific basic safety training. |
10781
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Thu Dec 11 15:40:04 2014 |
Steve | Update | safety | safety training |
Katherine Dooley has received 40m specific basic safety training in the 40m lab |
11531
|
Tue Aug 25 16:39:06 2015 |
Steve | Update | safety | safety training |
Alessandra Marrocchesi received 40m specific basic safety training yesteday. |
11660
|
Fri Oct 2 15:33:09 2015 |
Steve | Update | safety | safety training |
Gautom has received 40m specific basic safety training today. |
11728
|
Wed Nov 4 08:04:53 2015 |
Steve | Update | safety | safety training |
Yutaro Enamoto, visiting graduate student of Seiji received 40m specific basic safety training.
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Attachment 1: Yutaro.jpg
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12311
|
Tue Jul 19 15:16:43 2016 |
Steve | Update | safety | safety training |
Our new graduate student Lydia received 40m specific safety training. |
12479
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Fri Sep 9 11:24:15 2016 |
Steve | Update | safety | safety training |
Visiting graduate student Teng Zhang from Glasglow received 40m specific safety training yesterday. |
12565
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Mon Oct 17 14:48:12 2016 |
Steve | Update | safety | safety training |
Ashley Fowler "high shool" student received basic 40m safety training and Lydia is her guarding angle.
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12970
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Thu May 4 08:00:54 2017 |
Steve | Update | safety | safety training |
Freshmen Rebecca Zhang as " work study undergrad " received 40m specific basic safety training yesterday. |
12994
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Tue May 16 16:16:16 2017 |
Steve | Update | safety | safety training |
Early surfs of India Jigyasa and Kaustubh received basic 40m specific safety traning. |
Attachment 1: surfs2017.jpg
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13144
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Tue Jul 25 14:27:19 2017 |
Steve | Update | safety | safety training |
Kira Dubrovina and Naomi Wharton received 40m specific basic safety training. |
Attachment 1: safety.jpg
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13406
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Mon Oct 30 08:08:06 2017 |
Steve | Update | safety | safety training |
Udit Kahndelwal received 40m specific basic safety traning on Friday, Oct. 27 |
14263
|
Thu Oct 25 16:17:14 2018 |
Steve | Update | safety | safety training |
Chub Osthelder received 40m specific basic safety traning today. |
488
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Tue May 20 09:28:42 2008 |
steve | Bureaucracy | SAFETY | safety traning for 40m |
Tara Chalernsongsak, new gradstudent for K. Libbrecht was introduced to the basics of the 40m operations. |
1273
|
Thu Feb 5 09:12:29 2009 |
steve | Bureaucracy | SAFETY | safety updates & fire alarm test |
The fire alarm test was completed at 13:30 yesterday.
I updated the 40M Emergency Calling List by replacing Rob by Yoichy. The calling order: Vass, Aso and Taylor.
Rana and Yoichy were added to the "Registered PSL Operator List" and posted it in the lab. (not in the document, that should be up dated)
We are getting ready for the annual safety audit. It will be held next week at 14:00 Friday, Feb 13, 2009
Please participate in the preparation by correcting it or just tell me.
Rod Luna is organizing the pick up of the following old equipment:
HP laser jet 5000n, 3 of 19" 10 base-T network ports and 4 small hubs,
2 Sun monitors, 1 Viewsonic monitor, 7 keypads and
Hitachi scopes 2 of V-355, 2 of V-422, 1 of V-202 and 1 of V-6165
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1676
|
Tue Jun 16 03:43:04 2009 |
rob | Update | Locking | same troubles |
Lock is still being lost, right at the end of the process when trying to reduce the CARM offset to zero. |
6188
|
Thu Jan 12 07:44:21 2012 |
steve | Update | SUS | sapphire wire standoff quote |
On Tue, Dec 20, 2011 at 11:37 PM, Rana Adhikari wrote:
Steve,
We are thinking of replacing a few metal parts in the suspension with sapphire/ruby. We want to replace the standoff (which is Al) with sapphire and also the top plate where the wire is clamped.
For the top, we should make a cutout for a little plate in the existing crossbar. In the cutout would go a little mounting plate. Then the clamping plate (which is now steel) we would also replace with a Sapphire one.
I don't think it matters whether its sapphire or ruby, just has to be very hard.
Can you please get some quotes on the parts?
rana
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Attachment 1: standoff.PDF
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13747
|
Wed Apr 11 10:47:26 2018 |
Steve | Update | SUS | satellite amps labeled |
Satellite amplifiers labeled with date. Old labels left on. |
Attachment 1: DSC00912.JPG
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8719
|
Wed Jun 19 00:46:06 2013 |
Jenne | Update | SUS | save/restore alignment scripts now also work for TTs, fixed a bug |
I have done a quick update of the IFO_ALIGN screen's save and restore scripts, so that we can now also save, restore, and view the saved values for the input tip tilts.
In the past, there was an "if" statement to check if the optic was a PZT, and if so, define the alignment channels accordingly (since all the SOS suspensions have the same format for the name, and the PZTs were the odd ones out). I have removed the mention of PZTs, and replaced the if statement with an "if TTs" statement, and put in the correct channel names (C1:IOO-TT#_PIT_OFFSET, and the same for YAW).
Also, I caught a bug in the code, which explains some confusing behavior that I had seen in the past. When deciding if the restore script should take small steps or just do a big step, it looked at the difference between the saved value and the current value of the slider. It was *not* looking at the absolute value of the difference. So, if you had misaligned a slider by hand, and it was in the opposite direction of what the misalign script does, the restore script wouldn't realize that the optic needed to be restored in small steps. I have now fixed this bug for both pit and yaw cases of the restore script. |
6819
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Fri Jun 15 00:50:54 2012 |
yuta | Update | Green Locking | scanned Y arm for 5FSR |
I scanned Y arm for 5FSR (below).
I could done this after I put a whitening filter.
Currently, whitening filter between the beatbox and AA filter is made of
Ponoma blue box(passive filter with zero at 1 Hz, pole at 10 Hz) + SR560(flat gain 100)
I couldn't do more than 5FSR because SR560 overloads. I checked it by staring at the indicator during the scan.
Reason why we kept loosing lock last night was the overload of SR560. Mystery solved!
Anyway, 5FSR is enough.
Our next step is to reduce residual arm length fluctuation.

Also, I increased the alingnment of IR. So, the higher order modes are less than the last scan.
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6820
|
Fri Jun 15 01:53:05 2012 |
Koji | Update | Green Locking | scanned Y arm for 5FSR |
Interesting. It seems for me that there is a dependence of the noisiness as the beat frequency is scanned.
As you increase (or decrease?) the offset, C1:ALS-BEATY-COARSE_I_IN1 becomes bigger and more crisp.
The resulting out-of-loop stability also seems to be improved as you can see from the crispness of the PDH signal.
Do you find why this happens? Is this because the beat S/N depends on the beat frequency due to the PD noise?
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6823
|
Sat Jun 16 12:03:41 2012 |
Zach | Update | Green Locking | scanned Y arm for 5FSR |
Is that time stamp really correct? I wanted to look at the signal closely to see if I could get any feeling for why it would look so different when positive vs. negative, but I do not see a triangle anywhere near this time (1023780144)...
Quote: |
Interesting. It seems for me that there is a dependence of the noisiness as the beat frequency is scanned.
As you increase (or decrease?) the offset, C1:ALS-BEATY-COARSE_I_IN1 becomes bigger and more crisp.
The resulting out-of-loop stability also seems to be improved as you can see from the crispness of the PDH signal.
Do you find why this happens? Is this because the beat S/N depends on the beat frequency due to the PD noise?
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6824
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Sat Jun 16 13:01:17 2012 |
yuta | Update | Green Locking | scanned Y arm for 5FSR |
Quote: |
Is that time stamp really correct?
|
Yes. I used pyNDS to get data, but here's a screenshot of dataviewer playing back 300 seconds from GPS time 1023780144.

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450
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Fri Apr 25 15:44:21 2008 |
steve | Update | PSL | scattering measurments |
In pursuit of a low back scattering, high power beam dump we looked at materials such:
polished copper, polished aluminum, diamond cut aluminum, variety of polished & heat treated stainless steel and shades of black glasses.
Black glass is ideal at low power. Superpolished SS 304 #8 is the only material that measures close to bg
We are still looking for a conductive low back scattering material that would be ideal for a good high power beam trap.
Black glass-shade 12, ss304 superpolished #8 and white paper-B98-24lbs back scattering were compared at 1064 nm
Atm 1: data plot numbers from front panel of SR830 display,
sensitivity: 1x1 mV for bg and ss
1x1 V for wp
Atm 2: drawing of measurement set up
Atm 3: SR830 lock.amp settings
Atm 4: view from steering mirror
Atm 5: view from black glass trap
Atm 6: white paper |
Attachment 1: scatmeas20080425.xls
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Attachment 2: scattring_set_up_20080425.ppt
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Attachment 3: sr830settings.pdf
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Attachment 4: viewfmirror.pdf
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Attachment 5: viewfbgtrap.pdf
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Attachment 6: wpnmount.pdf
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5046
|
Wed Jul 27 15:18:50 2011 |
kiwamu | Summary | General | schedule |
The vent will start from 1 st of August ! !
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132
|
Wed Nov 28 16:46:28 2007 |
rana | Configuration | Computers | scientific linux 5.0 |
I tried installing Scientific Linux on Tiramisu. The installation process was so bad (really)
that I quit after 15 minutes. Its back to booting Ubuntu as if nothing had ever happened. Let
us never speak of Scientific Linux again. |
9984
|
Wed May 21 13:51:19 2014 |
Steve | Update | safety | scope battery recall |
Tektronix RECALL on TDS3000 or TDS300B oscilloscope BATTERIES TDS3BATB
This Lithium-Ion battery can be a fire hazard ! Remove battery pack and recycle it through Safety Office ! |
71
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Tue Nov 6 16:48:54 2007 |
tobin | Configuration | Computers | scopes on the net |
I configured our two 100 MHz Tektronix 3014B scopes with IP addresses: 131.215.113.24 (scope0) and 113.215.113.25 (scope1). Let the scripting commence!
There appears to be a Matlab Instrument Control Toolbox driver for this scope. |
5159
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Tue Aug 9 16:54:47 2011 |
steve | Update | VAC | scratch on vac door |
Jenne found a big scratch on the north vac door of ITMY. Fortunately it does not reach the inner annulos 0 -ring seal.
This is precisely what we have to avoid to preserve our vacuum system!
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Attachment 1: P1080152.JPG
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4373
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Thu Mar 3 07:25:24 2011 |
kiwamu | Update | Green Locking | screwed up the end PDH box |
I somehow screwed up the PDH box at the X end station. 
Right now it's not working, so I am going to check and fix it today.
In the last evening I found that one of the gain stages on the PDH box wasn't fully functional.
So I started investigating it and I though it was going to finish soon, but actually it wasn't so easy.
The PDH box has several gain stages. So an input signal goes through a buffer, a filter, a boost and an output buffer stages sequentially.
The boost stage is supposed to have gain of 10, but I found it didn't have such gain.
In fact the gain was something like -30dB which is pretty small. Plus this boost stage was imposing an wired bump on the transfer function around 50 kHz.
I checked the voltages on some components around the boost stage and confirmed there were no strange voltage.
Then I suspected that the op-amp : LF356 had been broken for some reason. So I replaced it by LT1792 to see if it fixes the issue.
Indeed it did make it functional. However after few minutes of the replacement, it went back to the same bad condition.
I have no idea about what was going on at that time. Anyway it needs more careful investigations.
I temporarily put a jumper cable on the board to skip this stage, but now the PDH lock is not healthy at all. |