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

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

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!

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. 

The PSL had one 1064 nm beam to be blocked around the north east side. The end enclosures are fine.

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

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

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

Den Martynov received 40m specific safety training.

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

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

Chloe Ling, Max Horton and Annalisa Allocca have received basic 40m specific safety training.

 Albert, our new undergrad work force received 40m specific- basic safety training last week. Please read and sign 40m procedures booklet.

Our early bird surf student Gautem has received 40m specific basic safety training today.

2014 surf students Nichin and Akhil received 40m specific basic safety training last week.

TaraV - geology major undergrad -  of Jenne's summer help received 40m specific basic safety training.

 Katherine Dooley has received 40m specific basic safety training in the 40m lab

Alessandra Marrocchesi received 40m specific basic safety training yesteday.

Gautom has received 40m specific basic safety training today.

Yutaro Enamoto, visiting graduate student of Seiji received 40m specific basic safety training.

Our new graduate student Lydia received 40m specific safety training.

Visiting graduate student Teng Zhang from Glasglow received 40m specific safety training yesterday.

Ashley Fowler  "high shool" student received basic 40m safety training and Lydia is her guarding angle.

Freshmen Rebecca Zhang as " work study undergrad "  received 40m specific basic safety training yesterday.

 Early surfs of India Jigyasa and Kaustubh received basic 40m specific safety traning.

Kira Dubrovina and Naomi Wharton received 40m specific basic safety training.

Udit Kahndelwal received 40m specific basic safety traning on Friday, Oct. 27

Chub Osthelder received 40m specific basic safety traning today.

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

Lock is still being lost, right at the end of the process when trying to reduce the CARM offset to zero.

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

Satellite amplifiers labeled with date. Old labels left on.

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.

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.

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?

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)...

 Yes. I used pyNDS to get data, but here's a screenshot of dataviewer playing back 300 seconds from GPS time 1023780144.

The vent will start from 1 st of August ! !

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 !

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!

 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.