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.
Hello, I am Varun Kelkar. I will be working at the 40m lab as a SURF student this summer with Eric Quintero on Audio processing for real time control system signals. This week I will mostly be working on implementing basic DSP C-code offline. Currently I am trying to write a code for noise whitening.
Varun has received 40m specific basic safety training today.
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.
ETMX has been jumping around again lately. Just now, I zeroed the ETMX alignment offsets in the SUS model, and centered the ETMX oplev spot via slow machine sliders. OSEM damping is on, oplev damping is off. Let's see how it moves around in the next day or so.
UTC: Jun 10 2016 23:18:26
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.
(on tower )
buy Ni coated ones for future use from www.electroenergy.com
Ok for larger RUBY,
unit is not in perfect condtition but usefull
Pick up FC from Gary with purchasing date 7-7-2015
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.
The GPS receiver (EndRun Technologies box in 1Y5? (rack closest to door)) seems to not coming back up properly after the reboot. The front pannel says that it's "LKD", but the "sync" LED is flashing instead of solid, and the time of year displayed on the front panel is showing day 6. The fb1 symmetricom driver and VME timing module are still both seeing day 299, though. So something may definitely be screwy with the GPS receiver.
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.
Fire alarm went off several minutes ago. Talked to security and they said there was no fire. It beeped twice again just now. No one has been working on the IFO today.
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.
NOT finished, last edited 6-28
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:
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.
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.
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:
Check crane functionality & cleanliness last week
We are venting the 40m IFO
Steve has ordered some teflon parts to take the place of the metal parts in his acetone-soaking jig. They should arrive tomorrow.
So, we will be begin the venting process tomorrow. Doors to come off on Tuesday.
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.
Guralps as connected with pictures
Ni plated SmCo magnets with specification of LIGO-C1103521-v2 for SOS ordered from Electron Energy Corp
100 pieces of Ni- Platted magnets are in 9-27-2016 They are stored at clean cabinet S15
EP30-2 epoxy 1/2 pt kit 250 ml of part A and 25 ml of part B should be here in 7 days. These can packed epoxy is much more economical than the double barrel cartridges.
Spare SOS wire clamps will be out of the machine shop next week.
0.0017" OD., 500ft steel music wire ordered. Pictures of the existing roll are below. It will be on 8" OD. spool too.
New Wiha 28504 torque wrench for SOS wire clamping. It's range 7.5 - 20 in-lb in 0.5 steps [ 0.9 - 2.2 Nm ] Audible and perceptible click when the pre-set torque has been attained at ±6% accuracy.
The new ETMX sus wire torqued to ~ 11.5 in-lb [1.3 Nm ]
The saga has started here We have to give credit to the Boss who fixed it. The seismometers themself are not labeled yet.
Atm6 added on 8-12-2016 EX needed to be centered
Thanks to Max for the nice plost at summery pages
The 7.5 in-lb of Wiha seems at the upper end of torque range for a 4-40 SS screw
Wiha 28502 ordered with range 5 -10 in-lb for silver plated 4-40 screws
Do not trust the Venzo torque wrench under 2 Nm ! It miss lead me.
Recommended torque values for silver-plated fasteners are here. For aLIGO we use the guidelines in T1100066-v6, This doc is posted in 40m wiki under Mechanics also.
So, we'll use 6 in-lbs on silver plated 18-8 stainless steel socket head cap screw 4-40 x 3/8 into SS tower bridge.
Please replace these clamp screws every time if they were tightened without a torque wrench.
2.1 mag earth quake in Norhten Ca
Our seimometers need professorial centering. Related electronics must be checked too.
The wire will arrive in 1-2 weeks. It is a new production. Brad Snook of Ca Fine Wire was suprised that we are still using the 13 years old wire. Oxidation is an issue with iron contained steel wire.
He would not give me a shelf life time on it. He recommended to check the strenght of it before usage. It passed with safety factor of 2 just recently.
In the future we'll store the new spool in oxigen free nitrogen environment..
0.0017" OD., 500ft steel music wire ordered. Pictures of the existing roll are below. It will on 9" OD. spool too.
The SOS ETMY tower had and Aluminum bridge. How is it possible that this was true? Is SS better than Al for some quantitative scientifc reason ???
Their weight ratio as measured = 922 / 307 g = 3
Destinies: SS 304 / Al 6061 > 0.289 / 0.098 [ lb /in3 ] = 2.94
The wire inprints were removed by 800P grain paper [Norton 73568] The SS bridge block now has an undesireble vally in the wire location.
The sus bridges were soaked in acetone over night and sonicated to remove residual sand paper.
I just put in the following into the air bake oven for a 12 hour, 70C bake:
I put these in at 10.30pm. So the oven will be turned off at 10.30am tomorrow morning. The oven temperature seems stable in the region 70-80 C (there is no temperature control except for the in built oven control, I just adjusted the dial till I found the oven remains at ~70C.
Tomorrow, we will look to put on first contact onto the ETMs, and then get about to re-suspending them.