I was lucky to notice that the nitrogen supply line to the vacuum valves was leaking. Closed ALL valves. Open supply line to atm. Fixed leak.
This was done fast so the pumps did not have to be shut down. Pressurized supply line and open valves to
"Vac Normal" condition in the right sequence.
The PMC HV drops off more offen lately.
Shade 12 black glass-green lines: 1/8" thick, 6" wide x 7 " high mounted on angle bracket below. Aperture 1" diameter. Let me know what do you think.
Thinks to do before the NEXT realignment:
B, tie 4 ancher bolts on table legs to the floor
C, tie 4 dog clamps between table and chamber
D, check the locked position of the 4 x 4 positioning screws
E, check bellow protecting 4 tubes are not shorting
A, here is the concrete slab cut
It reminds me to check the IFO vacuum envelope dog clamps on the chambers to floor with torque wrench.
I locked the PMC and MC resonated in TM00 right on. Than I started checking anchoring screws with the torque wrench.
B, 3/8 foor bolts were tight, They were set to 50 ft/lbs
C, dog clamp bolts were tight at 80 ft/lbs
D, horizontal position locks were lose. They were locked by finger.
E, below covers were reset not to short
The MC is locking in TM01 mode now
They were traced and labeled. One goes to 1X2 and the other to AS-ISCT. They are Andrew Heliax 1/4" od. made by CommScone, model number FSJ1-50A
The PMC acted like it was sleeping. The HV slider was dead. The MC locked instantly as the PMC had transmission.
The Nov.19 interruption was rescheduled to be on Nov.20,2011
CALIFORNIA INSTITUTE OF TECHNOLOGY
UTILITY & SERVICE INTERRUPTION
Building: CENTRAL ENGINEERING SERVICES, STEELE HOUSE, KECK LAB,
LIGO GRAVITATION PHYSICS BLDG, SAFETY STORAGE (BY CES)
Date: Sunday, Nov. 20,2011
Time: 10:00 AM TO 11:00 AM
Contact: MIKE ANCHONDO X-4999 OR TOM BRENNAN X-4984
*THIS INTERRUPTION IS REQUIRED FOR MAINTENANCE OF HIGH VOLTAGE SWITCHGEAR
IN CAMPUS SUB-STATION.
I'm looking for an ether net based power switch for turning lights on and off for the vacuum system from MEDM screen. This is what I found
Jamie please take a look at it.
I installed 4 remote AC power on/off strip at
1Y1 for the Vertex area 4 chamber illuminating lights ( CIL )
1Y3 for HV ps for PZT steering mirrors that should be interlocked with P1 pressure gauge. Power off above 3 mTorr
1Y4 for ETMY CILs,
1X9 for ETMX CILs
I need one volunteer to help me to make MEDM screen and connect the network to the switches.
The ETMX oplev returning beam is well centered on the qpd. We lost this signal 2 days ago. I will check on the qpd.
ETMX sus damping restored. c1iscex computer is down
The foreline pressure of TP2 was 1.4 Torr this morning. This drypump worked well for ten months.
Recently rebuilt drypump with new seal was swapped in.
This is how you do it: close V1, V4 and turn off TP2. Replace drypump and start up TP2
Set pump speed to 50 K rpm and open V4 to TP1 Note that the Maglev was not turned off because V4 was closed off only 5-10 minutes.
Open V1 the status is Vac Normal.
TP2 is rotating at 50K rpm, current pick up 0.2A, the temp is 26C and its foreline pressure 33 mTorr
Ben and Sam came over to fix one of the east side sliding door sensor that had to be moved from the inside to outside on the enclosure.
We turned off the 2w Innolight for 20minutes. The power is back on, the PMC and MC locked itself immediately.
This moring I centered the IOO Angle QPD. The IOO Pos QPD was not centered. The existing layout does not allow the beam centering of the Pos qpd without misaligning the MC
input. We have to add an aditional steering mirror. I will do that tomorrow morning.
I added the steering mirror for Pos and centered both qpds
The PRM lost damping about a day ago. It was restored.
C1:IOO-QPD_ANG_VERT beam movement in 1 degree C temp change in 3 hrs
Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows.
Problems: 1, they become magnetized after years being close to the magnets
2, they oxidize by time so it is hard to turn them
I looked around to replace them.
Titanium body, nose and beryllium copper spring. None magnetic for UHV enviorment.
Can be made in 7 weeks at an UNREASONABLE $169.00 ea at quantity of 50
The vacuum is ready for no AC power for 1 hr on Sunday morning at 10am
I did the follwing:
Closed V1, stopped the rotation of TP-1 maglev, waited till it reached 0 Hz_ rpm and turned it's controller off.
Closed V4 and stopped TP-2 rotating
Closed all annuloses and VA6
Closed VM1 and opened VM3 This means the RGA is being pumped by TP3. RGA is running in background mode. V5 will close instantly as the AC will be turned off.
VAC STATUS: IFO envelope and annulosses are not pumped. P1 pressure will reach 5-6 mTorr by Sunday morning.
The PSL output shutter will be closed by the interlock at 3 mTorr
Kiwamu will turn off Piezo Jena PZT power supplies and computers Saturday.
I will be here around 1pm Sunday to star pumping. I will need EPICs MEDM running by than.
State condition: Vac Normal, CC1 ~8e-6 Torr
The IFO pressure peaked at 8.3 mTorr after 2days of not pumping.
Here is 5 days of trend of the EOM temp sensor and the heater driver monitor. Unfortunately, it looks like we're regularly railing the heater. Not so awesome.
Can you zoom the temp mon? (V= -0.1 ~ +0.1)
The crystal was too cold and I tried to heat the PSL table by the lighting. But it seemed in vain.
It is not working
It is not obvious what is working.
Santa Anna wind speed was locked around 60 kmph last night on campus. The strongest in 30 years. The lab hold up well. We did not lose AC power either.
Threes and windows were blown out and over on campus.
We have 4 sliding glass windows without "heavy-laser proved" inside protection.
We should plan to upgrade ALL sliding glass windows with metal protection from the inside.The strongest in 30 years.
The existingly used used Pasternack Enterprices RG58 C/U cable lenght ~ 140 ft and the specs are here at Atm1
Atm2 The performance grade RG58-P coaxial cable specs.
3/4 " thick colored acrylic material will be used in this air tight design. Surgical tubing for o-ring. We may have to put an o-ring into the bottom to have it really air tight.
The top drawing is not ready. It will have handle and industrial grade L-handle lock pin to hold cover down. There will be 2 one inch od post in the midle of the table to hold the cover and lock the ball pin.
I'm waiting for your inputs, so I can send this preliminary design out for quote.
Is there a reason the framebuilder status light is red for all the front ends?
Also, I reenabled PRM watchdog.
Apparently there is a bug in the timing cards having to do with the new year roll-over that is causing front-end problems. From Rolf:
For systems using the Spectracom IRIG-B cards for timing information, the code did not properly roll over the time for
2012 (still thinks it is 2011 and get reports from DAQ of timing errors (0x4000)). I have made a temporary fix for this
in the controller.c code in branch-2.3, branch-2.4 and release 2.3.1.
I was going to check to see if the 40m is suffering from this. I'll be over to see if that's the problem.
The problem is the same as yesterday.
Dataviewer is recovered after heavy new year party.
ETMX sus damping restored
On Tue, Dec 20, 2011 at 11:37 PM, Rana Adhikari wrote:
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?
The present plan to go with clear cast acrylic plexiglass 1" thick side wall and two clear 1/2 thick top cover.
The inside would be lined with light braun YAG safety window sheets 0.14" VLT ~25% OD 4 @ 532nm & OD 5 @ 1064nm
Transparent- clear plexyglass from tree different sources were measured in 1064 and 532 nm light.
Samples: a, clear Acrylic-GP 0F00 from Ridout Plastics in thickness 0.7" , made by Evonic Ind
b, clear cast acrylic from Mc Master Carr in thickness 0.94" , likely made by Reynolds-Cast
c, clear cell cast plexyglass from Delvie's Plastics - Utah in thickness 0.93" , maker not known
PMC reflected beam was used at 92 mW and 6 mm diameter at incident angle 0-25 degrees.
All tree samples agreed on Transmittance of ~90%, Reflectivity ~3-4% and calculated Adsorption ~6-7%
Transparent Colored Acrylic orange-amber #2422 from www.eplastics.com in 0.12" thickness gave T 96%, R 1% and Ab-calc ~3% in the beam of 92 mW 1064 nm at 6 mm diameter.
Transparent , colored Light Red #26 thin film filter policarbonate-polyester 0.002" thick from Roscolux measured T 81% of 115 mW 1064 nm
Now I changed power meter FieldMate to Ophir and the light source to laser pointer 2.2 mW ~532 nm with 1-2 mm beam diameter.
Orange - amber #2422 sample, 0.12" thick, T 1% , R 4% and Ab-calculated ~95%, estimated visibility ~50% It does cut out the green at this low power level.
Light red #26 sample T 0.5% at 2.5 mW of 532 nm . The transparent green is not visible. The softening point of this sandwiched polycarbonate-polyecter filter is 160C. Estimated VLT of this film ~40%
Clear and colored acrylics' @ 1064 nm transmittance 90% or higher regardless of thickness. Softenig point 115 degrees C
Colored acrylic and colored policarbonate film are adsorbing the low power green and they transmit the 1064nm beam.
Options to consider: a, acrylic laser safety shield liner of 0.125" thick inside of 1" thick clear acrylic box, OD +5 @1064 and OD +4 @ 532nm, amber color VLT 27%, 150$/sqft
b, thin metal liner for 1" wall acrylic box, VLT 0%
I placed an other Y2-LW-1-2050-UV-45P/AR steering mirror into the beam path of the green beam launching in order to avoid the ~30 degrees use of the 45 degrees mirror. The job is not finished.
It started with fire alarm test yesterday at 14:50 All alarms are functioning VERY loud and their flashers are bright. Evacuation drill followed. We assembled at north west corner of the 40m building and counted 6 heads.
Nobody was left sleeping inside. Bob carried the success report of the drill to PMA office immediately.
The alignment is finished after the realization that the 3rd steering mirror had to be adjusted too.
The input power increased from 1.2 to 1.4 mW
In order to get a better price from Vlier's Tom Chen I changed Ti body back to SS304L-siver plated and music wire spring. The price is still ~$120 ea. at quantity 50
I will talk to Mike G about modifying the McMaster plunger with a hex nut.
I have realigned the beam pointing to PMC. The transmitted light increased from 0.74 to 0.83.
The misalignment was mainly in pitch.
The PMC pointing has changed, so MC is resonating in high order modes.
Roscolux filter films #74 night blue, 0.003" thick and #26 light red, 0.002" thick were measured in the beam path of ~6 mm diameter, 1W 1064 nm .
T 90% + - 5% at 0-30 degrees of incident angles and R ~10 %
These sandwitched thin films of policarbonate-polyester filters are not available in thicker forms. Rosco is recommending them to be cooled by air if used in high power beam.
These filters did not get warm at all in 1W, so absorption must be very small.
The 2W Innilight shutdown shut when I opened side door for safety scan. This was not a repeatable by opening -closing side doors later on. Turned laser on, locked PMC and MC locked instantly. The MC was not locked this moring and it seemed that the MC2 spot was still some high order mode
like yesterday. MC lock was lost when the janitor bumped something around the MC.
The 2W PSL laser is turned off. The danger laser lights are not illuminated at the entry doors because of malfunctioning electronic circuit!!!
Laser safety glasses are still required! Other lasers are in operation!
BEN fixed the interlock. The laser is turned ON. Thanks for all, Rich and Sam who came over to help. Atm1
All emergency shut- off switches, lights and door indicators are working at this moment. More about this tomorrow.
Atm2, PSL enclosure interlock jungle without REAL schematic drawing.....at this point.... We all agreed it is easier to redo the hole thing than find the problem
Atm3, Emergency shut off switches and illuminated signs from entry doors to AC on-off box ( Use this switches in emergency ONLY, otherwise leave alone , even it is labeled obsolete !)
Summery: I still do not really know what was wrong.
Rough draft of updated interlock drawing by Ben is here.
Cold LED lights replaced hot halogen ones. Flat LED MYAL 6S, model #112560002 24VAC
This is a LATE ENTRY. They were purchased in Jan 2010 and installed 6 of them around May 2010
Schott, green welding glass, shade 14, 3 mm thick was measured in the beam path of 1.2W, S polarization of 1064nm at ~1 mm diameter size as MC reflected path.
Absorption 95%, R 5% at incident angle 25-50 degrees. It looks like the perfect material for beam trap.
The attached trend shows a problem with the QPD sums.
Steve - please check on Monday the laser powers and the ETM/ITM reflectivity for HeNe lasers. Maybe we have to increase the transimpedance gain in the heads.
ETMX and ETMY have 0.2 mW returning to their QPDs........so the gain must lower at ETMX
ITMX laser 1103P has only 0.67 mW output and 0.025 mW returning to the QPD.
ITMX and ETMX oplev lanching paths have lenses without AR coating. This is my fault. I will buy them.
ETMX 0.2 mW 900 counts
ITMX 0.025 1300
SRM 0.04 2600
BS 0.05 3500
PRM 0.06 4000
ETMY 0.2 9000
ITMY 0.3 14500
Kiwamu showed me how to do transferfunction of oplev pitch
SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude:
I'm driving C1:SUS-ITMX_OLYAW and PIT_EXC with amplitude 0,1-0.3 while taking transfer funtions of oplev.
The transfer functions are normal. However I noticed that the LL osem is not responding to this excitations
Healthy sensor respons should be like Atm3
OL_YAW transfer functions are here.
I had two PHDs helping me to overlap the EXML files in DTT. We failed. This job requires professorial help.
These observations of the OSEMs were taken while taking transfer functions of oplev YAW at excitation amplitude 0.1
Atm1, C1:SUS-ETMX_SENSOR_SIDE cross coupling
Atm2, C1:SUS-ITMX_SENSOR_LL not excitable
Atm3-4, BS and PRM insensitive
Good OSEM list: ITMY, ETMY and SRM
I gave up tonight's locking activity because the MC can't stay locked.
It seems that somehow the seismic noise became louder from about 1:00 AM.
I walked around the outside of the 40-m building to see what's going on, but no one was jumping or partying.
I am leaving the MC autolocker disabled so that the laser won't be driven crazy and the WFS won't kick the MC suspensions.
The attachment is a 3-hour trend of the seismometer outputs and the MC trans.
Something has started shaking last night. Everybody is claiming to be innocent next door.
I turned off the 40m AC at 11:06
The shaking has stopped at 9:32am The AC was turned back on at 11:30am We still do not have any explanation