Sad situation

    The anti-symmetric port

spider webs fly in the wind

It looks very promising.

3-4 hrs ago we run out of nitrogen. We are back to Vacuum Normal

We have good RGA scan now. There was no scan for 3 months.

Local EQ 3.5 mag  at 2:28 UTC May 24, 2016 Rancho Cucamonga, Ca.....no damage

Varun has received 40m specific basic safety training today.

Please do not place anything on the top of the cabinets that is not tied down. It will end up on our head in an earth quake.

Machined from I-beam 6061 T6 Aluminum 5" x 0.5 x 3.25

Atm2, version 2 "pdstand" will allow you to clamp from any direction ( Koji was right )

There are some issues with 5 mm sapphire prism Atm5. It will cause  interference between one of the prisms and the Side OSEM.

Here are some drawings to see the issues with larger wire standoff.

The 2 mm prism will work.with a 1 mm longer dumbell.

Quotes requested from http://photomachining.com/laser-micromachining-photomachining-contact.html and http://www.optocity.com/ 

Local EQ 3.1 mag at Jun 2, 2016 11:06:16 PM UTC, Muscoy CA........no damage

Our STS should seen this shake.

Aakash Patil received 40m specific basic safety training.

EQ  5.2 mag at Jun 10, 8:04 am UTC, Borego Spring, CA  ~150 mi away.........no obvoius damage, damping restored, MC is locking, arms are flashing

The PMC transmission slow degration or it's input beam is not stable.

The drill room floor will be retiled Thursday, June 16. Temporary nitrogen line set up will allow emptying the hole area.

Ifo room entry will be through control room.

Visual inspection of rooftop GPS antennae:

The 2 GPS antennas are located on the north west corner of CES roof. Their condition looks well weathered. I'd be surprised if they work.

The BNC connector of the 1553 head is inside of the conduit so it is more likely to have a better connection than the other one.

I have not had a chance to look into the "GPS Time Server" unit.

PSL, BS, ITMY and ETMX the illuminators were left on over night.

NOT finished, last edited 7-7

Good job Johannes and Subham.

No suspention lost damping.

I called https://www.endruntechnologies.com/pdf/USM3014-0000-000.pdf  and they said it's very likely just needs a software update. They will email Jamie the details.

I wiped down the cranes with wet towel and Mario our janitor did the chamber tops with the tubes.

The optical tabels were not touched.

The outside temp peaked at 44 C yesterday

The fire alarm came on around 15:05  for about 2-3 minutes. We all  left the lab and counted heads.  I called Paul Mackel x2646 (cell 626/ 890- 3259) at Fire Protection Services. He said that this alarm test was planned and we should of got an email notice. Perhaps I missed that notes.

I got some QPR Nitrile gloves. They are LIGO approved.White nitrile gloves are naturally anti-static- 10⁹ ohms

Their touch not as good as laytex  gloves but try to use them.

Given the effect on the contrast defect, the consensus at the meeting Wednesday 6-22  was that we should continue to use the existing ETMX optic. 

We'll follow LIGO policy:
Our policy is to use first contact within 1 year of purchase for use in the interferometers.  For inspection use I am comfortable with out-of-date use.

GaryLinn offered their indate First Contact for use.

Hi Steve -

I found the doc I was looking for:

https://dcc.ligo.org/LIGO-E1200821

Specifically, you might find guidance in Section 5 and the pictures at the end of the doc.  This should work for Vacseal as well.

Good luck - it will take some time (hours to day or 2)...
I'll be interested to know how it goes.

GariLynn helped us develop this procedure so you could also ask her to cast an eye over the setup if you are worried.

-Betsy

ps: there is no existing fixture to hold SOS optic while soaking it
 

Praful Vasiceddy received 40m specific basic safety training.

In the attached photo from 2012, one can see the installed black glass baffle. According to the drawings (LIGO-DNNNXXX) this one has a clear aperture of 40 mm.

In (someplace ?) we have clean baffles with a 50 mm aperture which can be installed during this vent. In order to be more conservative, let us choose to swap these out for all 4 test masses during the upcoming vent using the green laser as an alignment guide, as Koji described at today's lunch meeting.

They are located at the top of E1 drawer cabinet

Proposed Acetone soak dish for SOS epoxy softening.

It has good acces through 5" top ID. The set up is stable and teflon lined.

Materials: glass jar with SS cover, teflon bricks, 0.008" teflon wrapped "high density Drever bricks" and aluminum

Drever brick: I beleive it is a Tungsten alloy. We used it as vac-bat savor at the coffe can. It has high density, heavy and hard, it was never identified.

I will soak one brick  to see if it has any reaction ability with acetone.

NO means that only Glass and Teflon can be used for this fixture in  Acetone. We can not take a chance on the coating!

I guess the small surface area Aluminum dumbbell, guide rod and-or wire standoff, magnet and epoxy does not degrade the acetone such way that it effects our coating.

Not ot mention, that only the very edge of the coating would in this solution.

  VENT OBJECTIVES:

1, Fix ETMX sus "jump issue"

2, First Contact clean the arms

3, Install new spare cold cathode and convectron gauges: InstruTech-Hornet

4, Install 50 mm apeture beam baffles

5, Check and clean optical quality viewport from inside

The following bullets were executed:

• Closed shutter of PSL-IR and green shutters at the ends 
• Checked jam nuts are protecting bellows 

• Check crane functionality & cleanliness last week

• Particle count must be under 10,000 counts / cf min for 0.5 micron 
• Checked all metal window covers are on. 
• Check 5 cylinders (24 cft size) of instrument grade air, called Alfa Gas 1 in stock.
• Took pictures of medm screens: sus-sum, aligned oplevs pos, alignment values and vac configuration
• Turned Oplev servos off
• Closed V1 and VM1, opened VM2
• Opened VV1 manual valve to Nitrogen cylinder and let the P1 to rise to 25 Torr
• Switched over to Instrument Grade Air Cylinder and continoed the vent with 8-10 PSI reading at the pressure regulator

We are venting the 40m IFO

I just disconnected the 6th instrument grade air cylinder from the vacuum envelope at 720 Torr. Now it will reach equilibrium through a filter as it sucks in lab air.

This is the sure way not to over pressurize the chamber.

Glass soaking dish with teflon guides.

The last RGA scan of this pumpdown 78

Pressure plot of 640 days long pd 78

CC1 cold cathode gauge was jump started with an accidental pressure glitch, that you can see on P1 plot

Yesterday Q noticed that PRM_sensor_LR was 0.098V  This actually went to ~ zero on 7-3

Vacuum Status: Chamber Open

All chamber annuloses are vented.  Vac Monitor screen is not communicating with gauges. The valve position indicator are working.

RGA is pumped by Maglev through VM2

Atm 1, It's right arm is perfect.

Atm 3-4, The left one has bended (dropped) end.

Atm 2, Our ruby wire stanoffs will fit the jig. Ruby OD 1.27 mm vs. old Aluminum OD 1.0 mm. Length ruby 6.4 mm vs Al 4.8 mm

Atm 5, The fixture translation stages are a bit loooose. Careful use of the micrometer is needed to be precise

Betsy agreed that the 40m will keep SOS fixtures.

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

I set up a simple HEPA filter dryer to dry your clean room garment before  you can put it away into your storage box.

Our lab is dusty ! This is  specially important when we are vented. Please wipe things daily and cover item with foils .... etc.

RGA background scan

Cheater cable to be used in clean room pitch gluing alingment.

Satelite amp needs to be there.

Atm 2-3, The ETMs  suspension damping cable  are connected at the end racks. All others go to 1X5

Atm 4-5, The other end of this cable in the high cable tray at 1X3 as shown. We'll disconnect the shorty and move the end to ETMX ( or any sus at 1X5 )

The heat drives the ants to the lab!  Make sure the light doors are tight on the chambers.

ITMY side  : Magnet od 1.9 mm so wire to magnet gap ~ 0.2-0.3 mm

Thanks for checking this out Koji

The builder in 1996 was Process System International, Inc ( Westborough, MA ) It does not exist any longer or I just could not find them. Flow diagramm at Atm1

Should I be keep looking for a company who could quote us for building a similar smaller unit with 10 - 15 cfm flowrate?

Note: my intension with the two mobile-overhead HEPA filter was the same as John Worden's " clean air overpressured tent " at chamber entrance.

Atm2, Our unit has 650 cfm, velocity 90 fpm at resistance 0.5"    It may be enough to give a little overpressure if we seal it well to the chamber

We use to use them to minimize dirt getting inside the chanbers.

The clamp is in the machine for milling off the grooves. It's condition is normal. The edges needs some 800 sand paper so it is not sharp anywhere.

How did those nicks get on the edge? Fortunatelly they did not aligned with the wire.

Unbaked steel music wire from  "Ca Fine Wire Co" from 24" od spool, od 0.0017" used. Identical to the one that broke.

The set up as shown with silver plated screws-washers on clamp. The unused clamp edges were sanded on P800 paper at 45 degrees just not to be very sharp.

Use your finger to feel the sharpness of  edge and sand till it gets a little bit not so sharp. The drawing note is "sharp edges" on wire clamp for low loss, high Q in mind.

The wire broke at the midle with single load 295 grms

The wire hold on overnight at single load 242 grms  Vezo torque wrench is not accurate!  This test was performed ~ 1.5Nm  DO NOT USE THIS NUMBER! (added at 8-10-2016)

This gives us a factor of 2 safety  with loop suspended of 250 grms small optic.

Gautam and Steve,

The clamp's left side was jammed onto the left guide pin. It was installed slit facing left. Gautam had to use force to remove it. The clamp should move freely seating on the guide rods till torque aplied. Do not move on with the hanging of optic with a jammed clamp. Fix it.

Never use force as you are hanging - aligning optic. The clamp is in the shop for resurfacing and slit opening.

ETMY UL epoxy soaking dish. All teflon in glass.