Osamu and Kiwamu received 40m safety training on Thursday, Feb 19, 2009

The spare M126N-1064-700,  sn 5519 of Dec 2006 rebuilt  NPRO's power output

 measured   750mW at DC2.06A with Ohpir meter.

Alberto's controller  unit 125/126-OPN-PS,  sn516m was disconnected from lenght measurment NPRO on the AP table.

5519 NPRO  was clamp to the optical table  without heatsink and it was on for 15 minutes.

The outside particle counts for 0.5 micron are 3 million this morning at 9am. Low clouds, foggy condition with low inversion layer.

This makes the 40m lab 30-50K

I just turned on the HEPA filter at the PSL enclosure.

Please, leave it on high

CES Mezzanine is beeing rebuilt to accommodate our new neighbor: the 20ft high water slide...& .jacuzzi

All our ac power transformers are up there. Yesterday we labelled the power switch of 480VAC on the mezz

that we need to keep to run the 3 cranes in the lab.

SRM, ITMX, ETMX, ITMY and ETMY lost damping at 4:55am this morning from 4.8 magnitude earthquake.

Their damping were restored.

C1:SUS-ITMX_URSEN_OUTPUT swich was found in off position. It was turned on.

MZehnder  and MC were locked.

The WFS qpd spot needs recentering

SUS-MC1_SENSOR_SIDE and SUS-MC2_SENSOR_UL are glitching

Yesterday's 4.8mag earthquake at Salton Sea is shown on Channel 1

ETMY sus damping was found to be tripped.

It was retored.

All fluorecent light were turned off. Please try to conserve some energy.

Eric Gustafson is handling the old HP4291A rehabilitation. Tarac picked both units up today.

March of 2008 Tucker Electronics failed to fix it's intermittent ~25MHz 0.5V oscillation at the swept sine output

See 40m-elog id:398 on 3-24-2008 by Rob Ward

The Caltech gasoline storage tank is being upgraded.

They are jack hammering and digging with bulldozer 50 yards south of  ETMY

Thanks to Joe B who made the SRS RGA working with linux

Last data file logged at 2008 Oct 24 with old Dycor unit

First data file logged at  2009 Feb 10 with SRS

Rga scan of day 231 since pumpdown pd66-m-d231

m stands for maglev pumping speed, vacuum normal condition of valves,

cc4 cold cathode gauge at the rga location,

cc1 is real ifo pressure from the 24" tube at the pumpspool,

PEM-count temp: vac envelope temp at the top of IOO chamber

Vacuum normal valve condition was changed to accommodate SRS-RGA calibration.

VM1 was closed to isolate the RGA from the IFO.

 
 
VM3 opened to TP3.
 
This condition is called back ground (BG) mode. It is where we can calibrate and see the RGA background without the IFO.

Cold cathode gauge CC4  is reading normal.

CC1 is glitching, it is probably dirty.

CC2 is fluctuating too much and it is cutting out for 6-7 minutes. It must be insulated by deposits and there is no emission current.

I think the same goes for P1

They will have to be replaced at the next vent

VM1 was closed to isolate the RGA from the IFO.

            
 
            
 
            
VM3 opened to TP3.
            
 
            
This condition is called back ground (BG) mode. It is where we can calibrate and see the RGA background without the IFO.
            

 Vacuum valve configuration is back to VACUUM NORMAL  condition. RGA  calibration  completed.

RGA  scan attached is the backgroud of the rga with std cal leak open, sn 08581

Krypton at amu 84 and Argon at amu 40 are the cal signals.

Our Osaka TG360MB maglev failed with CSB error message. This means that the dry emergency landing bearing has to be replaced.

I will consalt with Osaka about the choice of replacing bearing or installing new spare  tomorrow.

Mean while V1 is closed and the vac envelope is not pumped.

Valve configuration: BG -background, pumping on the RGA-only

High voltage to IOO PZT steering mirrors and OMC are turned off.

PSL output shutter is closed and manual block is in place.

I will start cooling the CYO pump in the morning, so the IFO will be pumped by noon.

Outgassing plus leakrate after  10 hrs the pressure is 2.3 mTorr

This rate of rise is normal and it is safe to work with the ifo.

The CRYO pump cooled down and VC1 was opened. This valve configuration is Cryo-only

PSL output shutter opened at 4pm 

PZT HV power supplies turned on for OMC and IOO steering mirrors.

There positions were not corrected to strain gauge values.

Ben helped us to conclude that the FAILURE led indicator is working correctly and

has nothing to do with the one lose, dangling wire#258 in the side connects of the vac rack.

I reset the CSB switch inside the Maglev controller and tried to start accelerating.

It fails after 2-3 sec and failure led light comes on.

Now we can say the MAGLEV 360 is DEAD and the new OSAKA TG420M can be swapped in.

However it requires new interface with our epics based MEDM or better...?

Ben and I found this vacuum valve relay box intermittently shorthing yesterday.

It effects V4, V5, VA6 and VM1........   Please do not touch this box under the beam pipe next to the vac rack!

The function of this box to send 120VAC to the vacuum valve to move.

I tested the cryopump interlock today. It is touchy. I do not have full confidence in it.

I'm proposing that VC1 gate valve should be kept closed while nobody is working in the 40m lab.

How to open gate valve:

1, confirm temp of 12K on the gauge at the  bottom of the cryopump

2, if medm screen cryo reads OFF( meaning warm) hit reset will result reading ON (meaning cold 12K )

3, open VC1 gate valve if P1 is not higher than 20 mTorr

VC1 was closed at 18:25,

IFO condition: not pumped,

expected leak plus  out gassing should be less than 5 mTorr/day

The RGA is in bg-mode, annuloses are closed off

CC1 5e-7 Torr,  VC1 closed at 18:25,  IFO is not pumped, RGA is in bg-mode

Congratulation Yoichi and Peter for full rf locking at night. Let's remember that the cryopump was shaking the hole vac envelope and ifo during this full lock.

 The Cryo pump is running reliably since April 22 hence there is no need to close VC1 repeatedly.

The photo switch interlock was put back onto the H2 vapor pressure gauge and it is working.

As PSL-126MOPA_DTEC went up, the power out put went down yesterday

 The NPRO cooling water was clogged at the needle valve. The heat sink temp was around ~37C

The flow-regulator  needle valve position is locked with a nut and it is frozen. It is not adjustable. However Jeenne's tapping and pushing down on the plastic hardware cleared the way for the water flow.

We have to remember to replace this needle valve when the new NPRO will be swapped in. I checked on the heat sink temp this morning. It is ~18C

There is condensation on the south end of the NPRO body, I wish that the DTEC value would just a little higher like 0.5V

The wavelenght of the diode is temp dependent: 0.3 nm/C. The fine tuning of this diode is done by thermo-electric cooler ( TEC )

To keep the diode precisely tuned to the absorption of the laser gain material the diode temp is held constant using electronic feedback control.

This value is zero now.

 Our spare Osaka maglev purchased in Oct 2005 turned out to be having a viton o-ring seal connection on the intake.

It was shipped back to San Jose for retrofitting it with 6" conflat flange ( CF ) This CF is using copper gasket so there will be no permeation of He when you leak check the IFO

The digital controller and cable are here. The controller needs to be interfaced with the interlocks and computer system; those have been in a neglected condition lately.

see elog #1505  Historically after every REBOOT of c1vac2 the readbacks works for 3-4 days only. Fixing of this was postponed many times in the past as low priority or lack of knowledgeable

enthusiast.

The maglev TG390MCAB wil be back on Tuesday, May 4, 2009.  The mourning of our fateful 360 will only end at the first levitation of the 390.

ETMY damping restored.

Cryo  interlock closed VC1 ~2 days ago. P1 is 6.3 mTorr. Cryo temp 12K stable, reset photoswitch and opened VC1

  Earthquake mag 4.0 at Lennox, Ca     trips MC2 watchdogs       http://quake.usgs.gov/recenteqs/Quakes/ci10411545.html

See 40m accelerometers as they see it.

All oplevs servos turned off to protect our suspentions from vibration due to drilling and pounding in CES high bay area.

This activity will be done from 10 am till 3 pm today.

Meanwhile our IFO-air conditions are turned off for maintenance.

Their performance of 6 months is shown on plot.

 Wilcoxon 731A seismic accelerometers and Guralp CMG-40T-old seismometer at magnitude 5 and 4 erthquakes

Rana suggested using OSEM sensing voltages as guide lines to look seismic activity.

As you see todays drilling and tumping activity was nothing compared to the EQ of mag 5 and 4

Optic level servos are turned back on.

What Steve means is that there is some drilling going on in the CES shop to accomodate the new water flume group. We want to

make sure that the mirrors don't move enough to break the magnets. On the dataviewer we should look to make sure that the

sensor channels stay between 0-2 V.     -Rana

I drained the water and removed side covers from the Neslab RTE 140 refrigerated water cooler unit this morning. The hoses to the laser were disconnected.

This abled you to see the little window of refregerant  R404A was free of bubles, meaning: no recharge was needed.

The circulator bath was refilled with 7 liters of Arrowhead distilled water and the unit was turned on.

The water temp was kept 20.00+- .05C without any load. Finally the AC-repair man Paul showed up.

He measured the R404A level to be as specified: 23-24 PSI on the suction side and 310 PSI on the discharge side.

The unit was working fine. Paul found an intermittently functioning starting capacitor on the compressor  that was removed.

The 240 micro Farad 120VAC cap will arrive tomorrow

Steve, Rob and Alberto

Starting capacitor 216 miroFarad was installed on the compressor. Water lines were connected to the MOPA as corrected, so the flow meter readings are logical.

Now IN means flowing water in the direction of black arrow on the hose.

We struggled with the Neslab presetting:  temp, bauds rate  and other  unknowns  till Rob found the M6000 manual on Peter king's website.

Alberto realized that the chiller temp had to be reset to 20C on water chiller.

I put 1mg of Chloramin T into the water to restrict the growth of algae in the bath.

The NPRO heat sink  was around ~20C without flow meter wheel rotation  and the PA body ~25C by touch of a finger

I just opened up the needle valve a litle bit so the flow meter wheel would started rotating slowly.

That small glitch at the end of this 3 hrs plot shows this adjustment.

The Neslab chiller is working well. It's temp display shows 20.0 C rock solid. Flow meter rotating at 13.5Hz at the out put of the chiller.

The MOPA temp was measured with a hand held thermocouple . The  PA was  34 C and 29 C at NPRO heat sink.

The NPRO flow meter was not rotating at this time. There was just trickeling water flow though the meter.

I closed the needle valve this point. It needed 8 turns clockwise. This drives head temp to 19.9 C

Than I opened the needle valve 9 turns and the flow meter wheel was  rotaing at ~ 1 Hz

We gained a little power. Can you explain this?

I moved the mobile HEPA filter from ITMX's north door to ITMX-ISCT and covered it up with a merostate tent to accommodate the aluminum foil particle measurement on June 5

It lowered the 40m baseline counts by about a factor of 3 of 0.5 micron and a factor of 2 of 1.0 micron.

The HEPA filter is sweeping the floor and blowing the particles upwards. The MET ONE counter is on the top of the IOOC looking south at ~75 degrees upward.

The PMC alarm was on this morning. It was relocked at lower HV

The FSS_RMTEMP jumped 0.5 C so The PZT was compensating for it.

Joe and Steve

The retrofitted Osaka 390 was installed on the pumpspool yesterday.

V1 gate valve is disabled for safety by disconnected pneumatic power plug.

The foreline of this maglev now have a KF25 size viton o-ring directly on the turbo.

This is bad for leak hunting.

Joe is ready with new interface cable. Power supply and cables are in place.

The maglev was pumped down this morning.

All new gas kits and metal hose were leak checked by sprayed methanol.

There is no obvious sign of leak. I was expecting the pressure to drop below 1e-5 Torr in one hour.

TP2 is drying out the levitating coils of the turbo at ~7 l/s for N2

We'll start the pump as soon as Joe is in.

 Joe and Steve

The Maglev is running at 680 Hz, 40,800 RPM with V1 gate valve  closed and  valve disabled to change position. C1vac2 was rebooted before starting.

Interlocks are not tested yet, but the medm COVAC_MONITOR.adl screen is reading correctly. RGA scan will determine the need for baking on Monday

The foreline pressure is still  ~2e-5 Torr

Acceleration takes 3 minutes 30sesconds without load. There is no observabale temp effect on the body of the turbo during braking and acceleration.

The IFO is still pumped by the CRYO only

 The new Maglev fore line pressure is at 4e-6 torr at day 3

Valve VM1 was closed to isolate IFO from RGA and valve VM2 was opened so the RGA can scan the Maglev only.

The maglev fore line pressure is 3e-6 torr at CC2 after 4 days of pumping. Varian turbo V-70 is pumping on it through V4 and VM2

Actual pumping speed ~10 l/s for N2. There was no baking. The maglev performance looks good : 3e-9 torr on CC4  with RGA -region only.

The Maglev is running for 10 days with V1 closed.  The pressure at the RGA-region is  at 2e-9 torr on CC4 cold cathode gauge.

Valve VM2 to Rga-only was opened 6 days ago. The foreline pressure is still 2.2e-6 torr with small Varian turbo ~10 l/s on cc2

Daily scans show small improvement in large amu 32 Oxygen and large amu 16, 17 and 18 H20 water peaks.

Argon calibration valve is leaking on our Ar cylinder and it is constant.

The good news is that there are no fragmented hydrocarbons in the spectrum.

The Maglev is soaked with water. It was seating in the 40m for 4 years with viton o-ring seals

However I can not explan the large oxygen peak, either Rai Weiss can not.

The Maglev scans are indicating cleanliness and water. I'm ready to open V1 to the IFO

 V1 valve is open to IFO now. V1 interlock will be tested tomorrow.

Valve configuration: VAC NORMAL with CRYO and Maglev are both pumping on the IFO

The IFO RGA scan is normal.

The Cryo needs to be regenerated next. It has been pumping for 36 days since last regenerated.

This has to be done periodically, so the Cryo's  14 K cold head is not insulated by by ice of all things pumped away from the IFO

The 40m lab specific safety training is done. The participants were

Stephanie Erickson, Clara Bennett, Chris Zimmerman, Zach Commings, Michelle Stephen surfs and Drew Cappel  postock.

They have already went through the Caltech Safety Office laser and general safety training.

They still have to read, understand and sign the the SOP for the laser & lab

Joe, Alberto and Steve

We tested gate valve V1 interlock by :

1, decelerated rotation by brake from maglev controller unit.

2, turned maglev  controller off from controller unit.

3, unpluged 220VAC plug from wall socket

None of the above action triggered V1 to close. This needs to be corrected in the future.

The MEDM monitor screen of maglev indicated the correct condition changes.