Enclosure is at the east end. It has it's bottom o-ring in place. It will be ready for optics tomorrow around 5pm
I have to shim out the enclosure, finish leveling the table and cut surgical tubing O-ring for the top.
Glued surgical latex tubing with super glue into O-ring shape. The existing in place tubing K-100, OD 0.125" (actual size 0.140"), wall 0.031", ID 0.062".
I have just found out that tolerances on tubing OD are + - 0.026" by the manufacturer. I'm getting larger tubing for better fit.
The table is ready for optics.
Things left to do:
1, finalize o-ring size 2, finish cable feedthrough 3, finalize window connection 4, IR-Thermashield strips for bridge sides 5, replace bridge support post with solid one
The PMC locked manually. MC grabbed lock instantaniously
Enclosure cover #1 transmission measured in 1064 nm, 156 mW, P polarization and beam size ~ 1 mm
As condition: fully assembled, protective layer removed, tinted- adhesive activated on yellow acrylic on top of each other.
T = 1.2 % in 20 minutes exposure test. This agrees with the test measurement of 6-18-2012
There is a reflected 2-3 cm circular glare that is barely visible on sensor card. It is well below 1 mW level
As we are installing the NPRO with ~350 mW of power we have to address what additional shield should be installed.
The June 2012 test with 1W power burned through of the 3 layer IR coated films in 3-4 hours.
We 'll use Aluminum shields in the high power path till we come up with better solution.
The TRY path on the end table is temporarily in place to help IFO locking.
The Y arm transmission was steered to get TRY back on the PD and the camera. I found that TRY is a couple of inches off in yaw at the end table (comparing to the CAD layout and the earlier layout) and I believe it is because of the changes in input pointing.
I've used a Y1 mirror to steer the Y transmission to an R98% BS. The reflected beam falls on PDA520 and the transmitted beam is steered to the camera. The earlier normalization of TRY is no more valid as the power distribution at the PD has changed.
Temporary acrylic wind guard added between enclosure and ETMY transmission window to help IFO locking
See Feb 2012 PRM yaw transferfunctions, also check Valera's modified side sensor may effect yaw motion
We got granite bases today from the manufacturer. We plan to set them up on Wednesday, 8 am. Please note, there will be an installation mess at Xend, Yend and corner during ~4 hours. Let us know if you have any objections to do this at this particular time.
Installation locations are specified in elog 8270, scheme attached is valid except for Xend. Instrument will be installed on the place of nitrogen containers.
( next to the wall at corner sout-east of the south end )
The carpenter shop finished the installation of the 3 granite bases.Rapid Set Cement All high strength non-shrink grout was used.
Compressive strength 3000 PSI at 1 hour and 9000 PSI at day 28 The janitor is still cleaning up after them at the south end.
The soft silicon gas kits are working well with the SS can. Den is making the adaptor plate drawing for the feedthrough.
I'm working on to improve the quality of the enclosure.
The short comings are: more cable feedthroughs needed, latches to anchor top covers air tight and posts to support bending bridges.
Red triangles are compression latches at 10 places to hold the top air tight on surgical tubing
Green lines represent 4 posts of Al 1" OD to support the covers and maximize their eigenfrequencies.
Black crosses are 4 spring loaded push-bottom quick release pins to anchor the top covers to the bridges. This connection will not be air tight.
(quarter-turn wing head fastener have the same problem) I'm thinking of some solution to minimize the leak.
Violet _ steel plate (1" wide, 15" long, 0.125" thick) between the two posts will anchor the quick release pins and make bridge rigid.
Blue rectangle is an other cable feedthrough exiting on the chamber side.
Planning to substitute window with soft - air tight ( Aluminized thin wall hose ) connection to vacuum view port where white circle is representing the Al adaptor ring.
Updated after Wednesday meeting 4-24-2013
Albert, our new undergrad work force received 40m specific- basic safety training last week. Please read and sign 40m procedures booklet.
Optics from the car were placed into glass door cabinet E0
I'm planning to remove the ETMY optical table enclosure and move it over to CES Shop 8am Thursday morning.
We'll install spring loaded lathes, hooks and quick release pins.
The bridge will be reinforced with steel plate to support release pins on posts.
There will be an other cut out for cable feedtrough as it is shown on elog #8472
Let me know if this timing does not fit your work.
I positioned the fiber loaded protecting tubing and anchored them so they can do their job.
However, the area needs a good clean up.
I tested On-Track (from LLO) OT 301 amp with PSM2-10 qpd. It was responding. Jenne will calibrate it. The 12V DC ps input is unipolar.
The one AC to DC adapter that Jenne tried was broken.
All ETMY optical table electronics- lasers-pds turned off, disconnected in order to remove enclosure.
It will arrive around 10 am Monday morning.
The bridge support posts were shimmed today. Surgical tubing 402R - o - rings were glued togeather with " instant krazy glue "
Atm2 Carey CH-3540 latches are compressed ~2.5 mm in the clamped position.
Atm3 is showing the captured quick release pin in the steel reinforced bridge that is supported by the post. It works great. The post screw is sealed by o-ring. The quick-pin is sealed by an epoxy attached copper cap.
Atm4 Enclosure is on it's back. Bottom o-ring can be seen. The hole reinforced bridge structure is visible.
Now I'm working on the window connection to the chamber. I'm very close leak checking this box.
In case of leaking around the top tubing seals we have two options:
a, cut down on the cover rim by 0.040" or b, increase tubing diameter
Temporary oplev in place. The spot on the qpd is still big. My two lens solution did not work.
I will finalize optical component position of the oplev after the the arm transmitted and green beam optics in place. They have priority.
Oplev spot size on qpd ~ 1 mm
PS: I realized it later that the returning beam is going through a lens for TRY. This is a nono.
This beam path will be relayed again as the TRY, green beam and IP-ang get there place.
Vacuum normal condition at pumdown day 100
The PI pzt holders are back from the shop. They are numbered 1, 2 & 3 and machined to match.
Tapered black delrin opener is to gauge the gap if it is too small to fit pzt. This is to prevent holder to be opened too much.
Our early bird surf student Gautem has received 40m specific basic safety training today.
Thank you Ben Abbott forwarding this information:
QPD Amplifier D990272 https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Number&docid=D990272&version= at the X-end. It plugs into a Generic QPD Interface, D990692, https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Number&docid=D990692&version= according to my drawings, that should be in 1x4-2-2A.
Update: We don't have our BIG screen
There was no light from the projector when I came in this morning. I suspected it might have to do with the lifetime of the bulb. But turning the projector OFF and ON got the projector working....but only for about 10-15 seconds. The display would go OFF after that. I will wait for some additional help to dismount it and check what the problem really is.
Thin wall connector from McMCarr#55275K25 was tested in 150 mW, 1 mm beam size of 1064 nm overnight. It did not show any degradation.
Atm2, Enclosure viewport adaptor is shown in place of the viewport.
Soft gaskit - durumeter hardness 10A - McMCarr#9010K51 was added on the 10" od sufaces of conflat and viewport adaptor to insure being air tight.
The duct connector clamped with soft braided elastic " Velstrech" brand loop.
Red-green laser pointers added to the depleted stock of 2011
The two pointers output measured 4.4 mW green and 2 mW red
Office work benches were cleaned up yesterday. Anti-image filter boards were moved to north wall of the control room. Koji's pd- electronics box placed next to water dispenser.
The removed ETMY optical table: TMC 4' x 2' x 4" with Aluminum enclosure was placed on table in the east arm.
The 3 Panasonic Ceramic Kits Books, 1206 NPO, SMT are well stocked. The 4 th one needs to be refilled at some values.
I labeled them on the cover for fast access. See Atm1
The Metalized Polyester Film Book with through holes mount are in good shape also. Atm2
The AVX Ceramic 1206, Garrett cab, range: 1pF - 22 microF 50V...... 67 values
Note here: that the value of dielectric, capacitance / voltage will vary
NPO: 1 pF - 1 nF / 50V .......37 values
X7R : 1 nF - 0.082 microF / 50V, 0.1 microF / 100V.......27 values
Y5V: 4.7 microF / 6.3 V, 10 microF / 10V, 22 microF / 6.3V.........3 values
Alex Cole and Craig Cahillane received 40m specific, basic safety training last week.
I'm not sure what's going on today but we're seeing ~80% packet loss on the 40MARS wireless network. This is obviously causing big problems for all of our wirelessly connected machines. The wired network seems to be fine.
I've tried power cycling the wireless router but it didn't seem to help. Not sure what's going on, or how it got this way. Investigating...
I'm still seeing some problems with this - some laptops are losing and not recovering any connection. What's to be done next? New router?
We had the same problem yesterday. However the Vacuum Dedicated laptop worked with fewer disconnects. Christian is coming over this after noon to look at this issue.
This happened a few weeks ago and it recovered misteriously. Jamie did not understand it.
Particle counts were measured inside the PSL enclosure at 40VAC variac setting.
Directly under HEPAs, on the east half of the optical table : 0.3 micron 20 particles / cu ft, 0.5 micron 0 p / cu ft, 0.7 micron 0 p / cu /ft
Away from the HEPAs, on the west edge of the op table: 0.3 micron 960 particles / cu ft, 0.5 micron 50 p / cu ft, 0.7 micron 20 p / cu ft
We may want to increase the RPM a little bit.
Checked our counters against recently calibrated Met One GT-526:
#1 is right on, #2 measured 25% less (it will go for calibration)
Flow bench at the south end : zero particle for all 3 sizes
IOO chamber particle logging measures 0.5 and 1 micron. Chamber opening limit is set to 10,000 particles max of 0.5 micron
At 10,000 p of 0.5 micron means ~100,000 - 180,000 p of 0.3 micron
We may have to lower the limit.
Mike and Christian brought over a Mac laptop for surf Alex.
They power cycled the wireless router of 40Marsh and labtops are working. Seeing 75-80% signals on all 3 Dell lab top sisters at both end of the lab
I found the south end emergency doors not latched completely. There was a ~ 3/8" vertical gap from top to bottom.
Please pull or push doors harder if they not catch fully.
Alex, Gautam and Steve,
Single mode fiber 50m long is layed out into cable tray that is attached to the beam tube of the Y arm.
It goes from ETMY to PSL enclosure. It is protected at both ends with " clear- pvc, slit corrugated loom tubing " 1.5" ID
The fiber is not protected between 1Y1 and 1Y4
Craig, Gautam and Steve,
It goes from ETMY to PSL enclosure. It is protected at both ends with " clear- nylon slit corrugated loom tubing " 1.5" ID
Installed 0.5" ID 10 ft long protective tubing at the PSL end of the ETMY fiber this morning. Here I had to cable tie a bunch of cables at the east side of the PSL enclosure.
They were hanging off the table blocking space were the sliding doors move.
At the ETMX end of the X-arm fiber received the same protective tubing.
ETMY optical table top was grounded to the ETMY chamber through 1 Mohms this morning. I also strain releifed relieved a few cables that were pulling on components directly.
There are 4 oscilloscopes left on the AP optical table top.... It's only 25 lbs... Do not leave anything on the optical table tops!
Alex and Steve,
Old halogen chamber illuminator cabling disconnected and potenciometer board removed at 1Y1 in order to give room for pd calibration fibre set up.
Pumpdown 75, vacuum normal condition at day 144
Keven and Steve,
The 3 cranes tested and wiped off as preparation for upcoming vent.
Thanks for the good preparation. IFO pressure P1=20 Torr
The 40m IFO has reached atmospher in 5 hours. It is ready to open chamber condition. The RGA is pumped with the maglev.
P1 pirani gauge is contact dependent as you see it on the linear plot It will be replaced during this vent.
The venting speed was 2-4 Torr / min
Atm2 shows how the BS is sensing the venting air cylinder changes.
The 4th cylinder of instrument grade air bump is overlapping with our janitor working at the BS chamber.
We will open the BS and ITMY doors first thing tomorrow morning. I plan to try to be in around 9 am. The first order of business will be to flip the folding mirrors that are not currently flipped (SR2, SR3, PR3).
Jenne, Annalisa & Steve
Manasa, Eric, Evan, Koji and Steve,
Access connector removed in order to complete alignment. Light aluminum with acetate windows AC installed.
Sujan got 40m specific basic safety training this morning.
We have been using Air Liquide Instrument Grade Air for venting the 40m vacuum envelope. It is no longer available.
The replacement is Alphagas 1, total hydrocarbon <0.1% ppm
LINK TO Alphagaz
Air Liquide > ALPHAGAZ™ Specifications
Because each analytical application is sensitive to critical impurities that can affect your results, tests in our research center and analyzer manufacturers' studies confirm that the main impurities are moisture, oxygen and hydrocarbons.
Based on these critical impurities, Air Liquide has developed ALPHAGAZ™ brand with a Maximum Impurity Level (H2O, O2, CnHm).
We missed to check that we had the green transmitted to the PSL after flipping the SRC and PRC folding mirrors.
There is no green transmission reaching the PSL even after locking the arms to green.
We should fix this tomorrow. The BS heavy door should come off.
Steve! Do not start pump down tomorrow !
We closed the chambers last night with heavy doors and reopened it today.
RGA background at day 12 of this vent . The maglev is pumping on the rga through VM2