Thu Jan 15 09:19:32 2009, steve, Update, IOO, MC locking
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MC2 sus damping was found tripped at the morning the second time this week.
Damping was restored, ISS gain lowered to avoid saturation, MZ manually locked
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Thu Jan 22 08:34:10 2009, steve, Bureaucracy, SAFETY, safety training
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Kakeru received 40m safety training yesterday.
He has no authorization to work alone in the high power beam path yet. |
Fri Jan 23 10:00:21 2009, steve, Update, PSL, PMC transmission is down
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The PMC transmission is going down.
I have not relocked the PMC yet. |
Thu Feb 5 09:12:29 2009, steve, Bureaucracy, SAFETY, safety updates & fire alarm test
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The fire alarm test was completed at 13:30 yesterday.
I updated the 40M Emergency Calling List by replacing Rob by Yoichy. The calling order: Vass, Aso and Taylor. |
Fri Feb 6 14:49:31 2009, steve, Summary, SAFETY, laser inventory
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40M Laser Inventory at Feb 05, 2009
1, Lightwave PA#102 @ 77,910 hrs 1064nm of 2.8W @ 27.65A
NPRO#206 @ 2.4A at PSL enclosure............"Big |
Fri Feb 6 16:23:54 2009, steve, Update, MOPA, MOPAs of 7 years
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MOPAs and their settings, powers of 7 years in the 40m |
Tue Feb 10 10:48:48 2009, steve, Bureaucracy, SAFETY, safety glasses scanned 
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All 40m safety glasses are absorbent.
They were scanned by 180 mW 2mm spot size of 1064 nm beam and
their transmissions were measured
They showed no degradation.
UVEX 's LOTG-YAG/CO2 glasses (fits
over personal glasses) 11 pieces,
Glendale-XC by Bacou-Dalloz, #1166218VLT68% , aerodynamic style, 7 pieces, (4 missing )
KG5- |
Wed Feb 11 11:39:17 2009, steve, Configuration, General, vac envelope ground
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The vacuum envelope was grounded from the IOO chamber to master ground north (under electric breaker panel L)
with 4GA 25ft red battery
cable.
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Fri Feb 13 08:38:03 2009, steve, Update, IOO, MC2 damping restored
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Fri Feb 13 16:30:49 2009, steve, Configuration, General, status quo is disturbed
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I have been getting ready for the annual safety inspection in the past 2-3 days.
Meaning cleaning up and disturbing the status quo on the floor mostly under the optical tables and their surroundings.
For
example: pd power supplies, He/Ne laser ps. and their positions.
BNC cables and ac power line positions can be different.
The |
Wed Feb 18 15:31:38 2009, steve, Bureaucracy, SAFETY, emergency back-up lights checked
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All 13 exit and emergency back-up lights and their batteries were checked.
Two of the batteries were replaced. |
Thu Feb 19 11:51:56 2009, steve, Update, MOPA, HTEMP variation is too much
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The C1:PSL-MOPA_HTEMP variation is more than 0.5 C daily
Normally this temp stays well within 0.1 C
This 80 days plots shows
that we have just entered this unstable region some days ago.
The control room temp set unchanged at 70 F, actual temp at ac-mon 69-70 with
occasional peaks at 74 F
Water temp at chiller repeatedly around 20.6 C at 8 am
This should be rock solid at |
Mon Feb 23 11:07:01 2009, steve, Bureaucracy, SAFETY, Kiwamu receives safety training
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Osamu and Kiwamu received 40m safety training on Thursday, Feb 19, 2009
Kiwamu needs Osamu's close supervision at PSL enclosure and AP table
I hope they already read, understood and signed the laser SOP |
Tue Mar 3 08:44:31 2009, steve, Update, PEM, air cond. maintenance today
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IFO room 104 air conditions will be shut down for maintenance today.
This should be finished by noon.
The temperature and particle
count variation can be more than usual. |
Wed Mar 11 16:41:22 2009, steve, Update, MOPA, spare NPRO power
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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. |
Fri Mar 20 11:01:02 2009, steve, Update, PEM, particle counts are high
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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. |
Fri Mar 20 15:54:29 2009, steve, Omnistructure, General, 480V crane power switch on MEZ
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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. |
Tue Mar 24 09:04:02 2009, steve, Update, SUS, 4.8 mag earthquake
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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. |
Wed Mar 25 09:55:45 2009, steve, Update, IOO, glitching sensors of MC
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SUS-MC1_SENSOR_SIDE and SUS-MC2_SENSOR_UL are glitching
Yesterday's 4.8mag earthquake at Salton Sea is shown on Channel 1 |
Sun Mar 29 13:44:27 2009, steve, Update, SUS, ETMY sus damping restored
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ETMY sus damping was found to be tripped.
It was retored.
All fluorecent light were turned off. Please try to conserve some energy. |
Mon Mar 30 15:51:27 2009, steve, Update, Electronics, HP4291A left the lab to be repaired
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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 |
Tue Mar 31 09:42:32 2009, steve, Update, PEM, ETMY sus damping restored again
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The Caltech gasoline storage tank is being upgraded.
They are jack hammering and digging with bulldozer 50 yards south of ETMY |
Wed Apr 1 10:22:13 2009, steve, Update, VAC, RGA logging is working
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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 |
Fri Apr 3 10:01:50 2009, steve, Update, VAC, rgascan with temp plot 
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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, |
Wed Apr 8 09:36:20 2009, steve, Configuration, VAC, valve condition changed to BG to calibrate the RGA
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Vacuum normal valve condition was changed to accommodate SRS-RGA calibration.
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Thu Apr 9 11:27:19 2009, steve, Update, VAC, vac gauge reading problem 
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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. |
Mon Apr 13 08:59:57 2009, steve, Update, PSL, mixers on order
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[quote][quote]
I then changed the RF Output Adjust slider in increments of 0.5, and measured the peak-to-peak values on the scope. In the table and on the plots, I've
taken into account the 12dB attenuation. i.e I actually measured 964mV, so 964mV*10^.6 = 3838mV.
|
Wed Apr 15 11:25:21 2009, steve, Configuration, VAC, RGA cal completed
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Quote:
Vacuum normal valve condition was changed to accommodate SRS-RGA calibration. |
Tue Apr 21 18:18:27 2009, steve, Update, VAC, maglev failed
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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. |
Wed Apr 22 11:16:26 2009, steve, Configuration, VAC, Cryo pump is ON and the Maglev is dead
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The CRYO pump cooled down and VC1 was opened. This valve configuration is
Cryo-only
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Thu Apr 23 16:38:33 2009, steve, Update, VAC, vac valve relay box is shorting
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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. |
Fri Apr 24 16:02:31 2009, steve, HowTo, VAC, cryo pump interlock rule
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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: |
Mon Apr 27 18:31:44 2009, steve, Configuration, VAC, VC1 closed
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CC1 5e-7 Torr, VC1 closed at 18:25, IFO is not pumped, RGA is in bg-mode
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Tue Apr 28 09:27:32 2009, steve, Configuration, VAC, cryopump deserves some credit 
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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. |
Wed Apr 29 10:20:14 2009, steve, HowTo, VAC, cryo pump interlock rule is waved
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Quote:
I tested the cryopump interlock today. It is touchy. I do not have full confidence in it. |
Mon May 4 10:38:52 2009, steve, Update, MOPA, laser power is dropped
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As PSL-126MOPA_DTEC went up, the power out put went down yesterday |
Tue May 5 10:42:18 2009, steve, Update, MOPA, laser power is back
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Quote:
As PSL-126MOPA_DTEC went up, the power out put went down yesterday |
Thu May 7 10:28:20 2009, steve, Update, VAC, retrofitted maglev's needs
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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 |
Sun May 10 13:41:17 2009, steve, Update, VAC, ETMY damping restored, VC1 opened
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ETMY damping restored.
Cryo interlock closed VC1 ~2 days ago. P1 is 6.3 mTorr. Cryo temp 12K stable, reset photoswitch and opened VC1 |
Mon May 11 11:49:20 2009, steve, Update, PSL, MOPA cooling water lines are backwards
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[quote]This is 8 days of 10-minute trend.
DTEC is just the feedback control signal required to keep the NPRO's pump diode at a constant temperature.
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Thu May 14 15:28:28 2009, steve, Summary, SUS, April 24 earthquake effect on MC2
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[quote][quote]The MC side problem could also be the side tramp unit problem. Set the tramp to 0 and see if that helps.[/quote]
This started around April 23, around the time that TP1 failed and we switched to the cryopump, and also when there was a mag 4 earthquake in LA. My money's |
Tue May 19 09:34:29 2009, steve, Configuration, VAC, IFO is not pumped & CRYO is being regenerated 
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Morning Vacuum condition: IFO is not being pumped, P1 pressure is 1.8 mTorr and rising (see P1 pressure plot of 100 min ).
Overnight the RGA protection software interlock at closed the VM1 valve triggering on CC1 = 1e-5 torr.
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Tue May 19 15:57:07 2009, steve, Update, IOO, MC2 damping restored after EQ
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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. |
Tue May 19 16:18:45 2009, steve, Configuration, VAC, IFO pressure is 4.2e-7 Torr with CRYO pump
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[quote]Morning Vacuum condition: IFO is not being pumped, P1 pressure is 1.8 mTorr and rising (see P1 pressure plot of 100 min ).
Overnight the RGA protection software interlock at closed the VM1 valve triggering on CC1 = 1e-5 torr.
|
Wed May 20 09:55:18 2009, steve, Update, PEM, oplev servos turned off
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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.
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Wed May 20 10:43:17 2009, steve, Omnistructure, Environment, accelerometers sensitivity
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Quote:
2009 May 18 03:39:36 UTC
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Wed May 20 16:03:52 2009, steve, Omnistructure, Environment, using OSEMs to look at seismic activity
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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. |
Thu May 28 18:41:26 2009, steve, Update, PSL, the saga of the chiller is ending
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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. |
Fri May 29 18:57:09 2009, steve, Update, PSL, the laser is back
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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 |
Thu Jun 4 15:53:15 2009, steve, Update, PSL, NPRO cooling flowrate adjusted
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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. |