ELOG 40m

etmy oplev laser replaced

SUS

The 9 years old Uniphase HeNe was replaced by a new JDSU 1103P
Power output ~3.5 mW, reflected light back on qpd ~140 microW, 12,800 counts
Andrey will get the ~2.5 mm od spot on the qpd smaller by replacing
the f1000 lens

488

Tue May 20 09:28:42 2008

Bureaucracy

safety traning for 40m

Tara Chalernsongsak, new gradstudent for K. Libbrecht was introduced to the basics of the 40m operations.

491

Thu May 22 11:21:45 2008

Caltech under grad Eric Mintun received the 40m safety training.
Now he has to read and sign SOP of laser and ifo.
He'll be working with GigE cameras with Joe

502

Wed May 28 14:19:47 2008

atm 1: scattering psl table optics from the top of the output periscope f4, 60s @MOPA 3 W
atm 2: scattering psl table optics from the top of the output periscope f4, 20s
atm 3: competing GigE cameras on the north end of psl table
atm 4: yellow "soft" washer to be replaced on psl output periscope
atm 5: ETMY-ISCT in disarray

Attachment 1: pslscat.png

Attachment 2: pslscat2.png

Attachment 3: 2GigEs.png

Attachment 4: perwash.png

Attachment 5: etmydisarray.png

504

Thu May 29 16:32:09 2008

I relayed the optics for ETMY-oplev as shown in pictures below.
The reflected beam goes directly to the qpd

Attachment 1: P1020417.png

Attachment 2: P1020420.png

505

Thu May 29 16:49:49 2008

Yoichi had his first 40m meeting. We welcomed him and Tobin, who is visiting, by sugar napoleons that
Bob made.

Attachment 1: yoichi.png

Attachment 2: bobsn.png

516

Wed Jun 4 10:18:52 2008

I moved the SS trap over to the psl table.
Texas super # 8 was used from the large shipment.
TXs#8 scattering measured as before, meaning the polishing is good.

Go's squeezing power pick up 350 mW was used.
I made two ~30 degrees wedge traps using 6" x 4" and 12" x 4" SS 0.039" thick
with copper backing of similar size.

There was too much scattering and I could not minimize them all.
It is very helpful to have so much space on the psl table.
It shows more of the weakness of this kind of trap.
I did not dare to turn up the power.

Attachment 1: trap1.png

Attachment 2: trap2.png

523

Fri Jun 6 15:56:00 2008

Bureaucracy

Yoichi received safety training

Yoichi Aso received 40m specific safety training.

524

Fri Jun 6 16:10:51 2008

HEPA filters are running at 100%

The psl HEPA filters were turned up to run at 100% to accommodate beam trap work on Tuesday, June 3, 2008

528

Tue Jun 10 08:37:18 2008

beam trap is being tested

High power beam trap is being tested just west of FSS area on psl enclosure.

When the pmc is operating at low power that means that the rest of the 3W is going into the
circular SS trap.

Please beware of the high power beam trap test

Attachment 1: trapss3w.png

529

Wed Jun 11 11:45:25 2008

The trap works well at 3 W level. No back reflected beam coming out of the trap on low power
sensing card level. The back scattering was not measured. The trap is insensitive to small pointing variations.
The SS surface did not show any visible degradation after 16 hrs of 3w exposure at elliptical beam size 4x8 mm

It is ready to be placed into the 35 W beam.

Attachment 1: P1020534.png

Attachment 2: P1020533.png

550

Fri Jun 20 17:42:48 2008

SS trap scattering compared to black glass trap

Circular SS304 trap was compared to wedged black glass trap.

The measurement set up of entry 529 was changed to define polarization.
CrystaLaser was remounted in horizontal position and half wave plate was placed after it.
These measurements were done in horizontal polarization.

atm1: the cSSt and wBGt was moved horizontally, ~90 degrees of the incident beam
atm2: traps were rotated around the incident beam, ~20 degrees each direction
atm3: set up
atm4: top view of traps
atm5: side view of trap

Attachment 1: cSSt_1.png

Attachment 2: cSSt_2.png

Attachment 3: scatset_61908.png

Attachment 4: cSSt&wBGt.png

Attachment 5: cSStbeam.png

581

Fri Jun 27 09:20:15 2008

Frogs

dust particle count is up & alarm handler is on

This 3 years plot show the trend of seasons.
When outside air quality goes bad ( 0.5 micron > 1 million ) the lab follows.
I will demonstrate this effect with a 4th of July fire works calibration.
Let's do not forget the construction activity next door either.

The alarm handler is busy:
It's sound level were reset to a modest level yesterday.
It would be nice to change the alarm sound so it can play Wagner:Der Ring des Nibelungen:
Das Rheingold, Die Walkure & Siegfried and Gotterdammerung
or something more appropriate than the present frog call

1, half micron count is climbing ( it's close to 16k now )
2, MZ refl signal is too high
3, MC lenght servo LO is too

Attachment 1: dust3y.jpg

600

Mon Jun 30 08:59:23 2008

IOO

IOO-MC_DEMOD_LO is low

The alarm handler is beeping relentlessly: asking for help in high partical count and low demod signal

Attachment 1: demlo.jpg_____

608

Tue Jul 1 09:26:33 2008

Tue Jul 1 10:15:22 2008

The laser recovered from a short temp rise. The MZ was aligned and realigned. The suspentions were kicked up accidentally.
Now the computers are down.

Attachment 1: 2d.jpg

624

Wed Jul 2 15:14:42 2008

I placed baked razor beam trap after INJ_SM1 and flipper in the injection path on the AP table

Quote:

I have constructed the beam injection optics for the abs length measurement.

The injection beam was coarsely aligned to the interferometer. The reflected beam from SRM was already seen at AS CCD.
I have attached the optical configration for this measurement and the optics layout at the AP table.

I am going to go to LHO for three weeks. During the absence Alberto tunes the mode matching and the alignment of the interferometer.

In the process of making this report, I noticed that one of the iris apertures is about disturbing the beam for OMCR CCD. I will check this before I go to Hanford. Also an RF spectrum analyzer is at the AP table. I try to return this near the PSL on Monday morning.

Attachment 1: Optical configuration for the abs length measurement.
1) One of the arms is locked to the PSL beam by the main control system (red).
2) A laser beam is injected from the AS port (blue). This laser essentially has different frequency from that of PSL.
3) The injected beam and the outgoing PSL beam appear at the output of the faraday in the injection system.
4) They beat each other at the frequency difference of those two lasers.
5) A PLL is used to lock the frequency difference to a local oscillator (LO).
6) The LO frequency is swept at around 3.87MHz, that is the approximate FSR frequency of the arm cavity.
7) If the LO frequency hits the FSR within the resonant width, the beating also appears at the transmitted light as the injected beam also becomes resonant to the arm cavity.
8) Amplitude of the beating at the transmitted light is measured by a RF spectrum analyzer as a function of the LO frequency. We get the FSR frequency (= the arm cavity length) from the top of the resonance.

Attachment 2: Optics at the AP table for the laser injection
700mW NPRO, laser source. vertically polarized.
Periscope, to raise the beam 1 inch to make the beam at the 4 inch elevation.
INJ_SM1/INJ_SM2, steering mirrors to align the injection beam to the IFO beam.
HWP1, half wave plate to make the beam to the farady horiz-polarized. nominal 42deg on the readout.
FI, Faraday isolator for protection of the NPRO from the returning light, for obtaining the returning light.
HWP2, to make the beam from the Faraday horiz-polarized. nominal 357deg on the readout.
MM_Lens, f=125mm to match the laser mode to the IFO beam.
SM1/SM2, steering mirrors to align the IFO beam to the Farady Isolator.
IRIS1/IRIS2, for the coarse alignment of the injection beam.
FLIP, flipper mount to turn on/off the injection optics.

Alignment procedure of the injection system
0) Ignite NPRO several hours before the experiment so that the laser frequency can be stable.
1) Turn up FLIP. Close the shutter of NPRO.
2) Adjust SM1/SM2 so that the ifo beam can appear at the output of FI.
3) Adjust height and position of IRIS1/IRIS2 with regard to the ifo beam so that the ifo beam goes through IRIS1/IRIS2 even when they are closed.
4) Turn down FLIP. Open the shutter of NPRO.
5) Adjust INJ_SM1/INJ_SM2 so that the injection beam can go through IRIS1/IRIS2 even when they are closed.
6) At this time, it is expected that the reflection of the injection beam from SRM appears at AS CCD, if SRM is aligned.
7) Adjust INJ_SM1/INJ_SM2 so that the injection beam at AS CCD can overlap to the IFO beam.
8) Confirm the beam at the output of the FI also overlaps.
---- We are here ----
9) Change the ifo configuration to the X or Y arm only.
10) Scan the crystal temperature of the 700mW NPRO in order to try to have the beating of the two beams at the PD. AS OSA may be useful to obtain the beating.
11) Once the beating is obtained, adjust INJ_SM1/INJ_SM2 such that the beating amplitude is maximized.

642

Mon Jul 7 16:30:08 2008

PSL-PEM 16 days trend

This morning the laser head temp was up to 20.3C because the laser chiller was overflowing.
I removed 700 cc water.

The PSL-FSS_RMTEMP became much more stable during the holidays as the psl enclosure was closed for 4 days

The high particle counts can be explaned by construction activity today.

The PMC & MZ PZT high voltages were out of range this morning.

Attachment 1: pempsl16d.jpg

645

Tue Jul 8 08:16:56 2008

The PMC is unhappy. PMC auto locker is not working.
DC output slider adjust has to be moved from rail to rail before it locks.

MZ is working great.

Attachment 1: pmc.jpg

646

Tue Jul 8 10:20:10 2008

It is specially important to run the PSL-HEPA filters when inside counts is peaking at 30,000 counts

There is a small label at the hepa on/off switch:
enclosure open 100%,
low noise off,
normal 60% of Variac voltage setting on the top of the enclosure

Not running the HEPAs will lower the temp fluctuations from 1.5 to o.5 degree C
at the cost of particle counts from 0 to immidiate room counts.

Attachment 1: hepa.jpg

652

Wed Jul 9 15:04:22 2008

Surf students are helping out with baffle cleaning.

Attachment 1: surfjob.png

659

Fri Jul 11 09:29:02 2008

the PMC still hangs up

Morning alarms:

PMC high voltage is railing, it's auto locker is frosen
I have to move DC Output Adjust slider by hand and it locks immediately

PSL_ISS is saturating. Saturation goes away when PMC is locked.

Laser chiller water is overflowing again: removed 450 cc water

Attachment 1: pmc4d.jpg

670

Tue Jul 15 09:47:09 2008

lab temps and particles

All air condtion units were serviced last Friday.
AC filters are trying to control our particle counts but they have no capacity to match bad Pasadena conditions.
IFO room filters at CES were really clean.
Air make up filters inside and outside were dirty.
They showed the construction effect.
Control room and clean assembly units needed all filters replaced.

Note: the PSL-FSS_RCTEMP droped o.1C when enclouser HEPAs were turned back on
The RC temp controller should be better than that!

Attachment 1: temps24d.jpg

672

Tue Jul 15 10:24:57 2008

PMC temp & pzt voltage

The PMC pzt HV was happy with no HEPA temp stability.
Can we thermally insulate the pmc ?

Attachment 1: pmctemp.jpg

677

Wed Jul 16 09:27:17 2008

PSL-FSS_RMTEMP alarm is false

ALARM

Morning alarm sound is good for people who does not drink coffee.
Our 40m alarm is on every morning.
Those whom are not here in the morning thinks that this beeping sound is inspirational.
Would someone change this sound into less punishing form, like mockingbird chirp....

The C1PSL_SETTINGS.adl (40mm PSL Settings ) indicating that
C1:PSL-FSS_INOFFSET (Input Offset Adjust ) should be 0.3 +-0.05 V (red warning tag )

Alarm Handler: 40M pointing to yellow grade warning of PSL-FSS_RMTEM
This is a false alarm.

Two years trend of these channels are here:

Attachment 1: frmtemp2y.jpg

688

Thu Jul 17 08:30:15 2008

PMC relocked manually

The PMC pzt HV and the servo gain adj. are railing at max this morning

Why is it on the decreasing side of FSS_RTTEMP slope?

Attachment 1: pmc4d.jpg

705

Mon Jul 21 10:00:42 2008

Five years of temp trend with 5 C fluctuation. The campus chilled water supply was upgraded ~ 1 year ago.

I requested our thermostats to be calibrated.

Attachment 1: temp5y.jpg

708

Mon Jul 21 15:52:22 2008

The fire alarm test and evacuation drill was successfully completed at 13:45 Wednesday, July 16, 2008

Everybody was on time for the 40m meeting.

712

Tue Jul 22 09:24:17 2008

Laser power reality of 120 days

Attachment 1: power120d.jpg

716

Tue Jul 22 16:50:09 2008

professorial clean up of work bench

Metaphysics

Environment

Atm1: is showing the spiritual satisfaction after work bench clean up by the professor himself.

Atm2: some items are still waiting to be placed back to their location

Attachment 1: ranaclup.png

Attachment 2: cleanup2.png

790

Mon Aug 4 12:12:20 2008

The 40m vac envelope was vented this morning.
P1 is at 760 Torr

Attachment 1: vent3h.jpg

Attachment 2: Untitled.png

797

Tue Aug 5 10:23:00 2008

earthquake and venting effects

SUS

atm 1, EQ
atm 2, vent 7 days later: venting kicks optic into place to be free,
PRM: LR magnet gets pushed in and it is stocked, side in free

Attachment 1: eq4h.jpg

Attachment 2: vent4hr.jpg

831

Wed Aug 13 17:00:59 2008

The PRM sat amp is broken. Ben is working on it.
The BS sat amp was removed from the BS sus and it is used with the PRM in
order to damp it for wire stand-off alignment.

833

Thu Aug 14 10:26:45 2008

sus cable pin cheater for out of vac damping

HowTo

SUS

The 40m D25 vacuum feed troughs give you a mirror image pin count.

Sus damping outside of the vacuum envelope require this cheater cable where
on the male D pin 1 is connected to female D 13 and so on
and male D pin 14 is connected to female D 25 and so on

Attachment 1: suscabmin.png

834

Thu Aug 14 11:39:06 2008

particle counter is out of order

The 40m ifo paricle counter sensor failed last night.

840

Fri Aug 15 14:12:31 2008

Bureaucracy

safety glasses required

The MOPA shutter is opened,
the PSL enclosure is switched to bypass mode,
manual block removed from PMC,

the PSL output is still blocked and the mechanical shutter is still closed.

Pumpdown is at 300 Torr continuing

Laser safety glasses are required!

843

Fri Aug 15 19:32:49 2008

I have just reached vacuum normal. The maglev peaked at 49.8C body temp with aux fan on at 3.2 Torr
cc1 1e-4Torr

note: pumpdown was put on hold for Koji's goodby lunch

Attachment 1: pdprm.jpg

845

Mon Aug 18 09:19:55 2008

It took 11 days to fix earth quake triggered sus problems of ITMX, SRM and PRM
Only ITMX north and BSC north vac doors were removed.

The PRM sus had to be removed form the vac envelope for "hip replacement"-new wire stand off was
epoxied in place.
Note: the PRM has no guide rod on the other side

ITMX, SRM and BS osems were optimized in place.
No crosscoupling optimization was performed.
Beam block was removed from ITMXC, it was too close to the main beam.

POX pick off mirror and mount will be replaced next vent.

Vac viewports were inspected from the inside.

Attachment 1: ventprm.jpg

865

Thu Aug 21 10:24:20 2008

Configuration

laser safe mode condition

The MOPA and PSL shutters are closed.
Manual beam blocks are in place.
Enclosure interlock is enabled.
No other high power laser is in operation.

We are in laser safe of operation for visiting students from Japan

NO safety glasses required

866

Thu Aug 21 16:28:59 2008

Configuration

safety glasses required

I just opened the MOPA shutter so PA is warming up.

High power beam path is cleared and laser safety glasses required.

871

Fri Aug 22 16:06:29 2008

particle counter replaced, flowbenches & HEPAs checked

MetOne #2 counter was swapped in (on the top of IOC, facing SW direction, at ~75 deg upwards)
with channel one size 0.3 micron and channel two size 1.0 micron.
Sampling time was reduced from 60s to 6 sec at 0.1 cf/min at 25 min rate.

This means that displayed number needs to be multiplied by x100 to get particles/cf/min

HEPA filters and flow benches were checked:

PSL enclosure closed, HEPA speed at 60% 0-0 particles on optical table NW corner

AP covered optical table 1,000 particles of 0.3micron and 10 of 1.0 micron at NE corner

Flow bench at SE 0-0 particle (p)

on the top of SP cover at SE corner 60,000 p of 0.3 micron and 530 p of 1.0 micron

Mobile HEPAs 10cm from output screen in the center 800 p of 0.3 micron and 0 p of 1 micron
These filters will be replaced.

Clean assembly room:
both flow benches 0-0 p for 0.3-1.0 micron
east side bench 520 p of 0.3 micron and 210 p of 1.0 micron

Large hood in baking room with fan on 1.7 million p of 0.3 micron
and 16,000 p of 1.0 micron

Pasadena air just outside of main entrance:
3 million p of 0.3 micron and 30,000 p of 1.0 micron

My desk 743,000 p of 0.3micron, 63,000 p of 0.5 micron and 5,500 p of 1.0 micron cf/min

NOTE: existing COCHECKLIST.adl PEM displays needs to be corrected so it shows the 10 fold increase
and change particle size on this screen to 0.3 micron

875

Mon Aug 25 10:23:53 2008

Rack 1Y7 double violation:

BNC cables left to be jammed by door

and see destroyed BNCs

RED fibers should be rerouted.
I placed protective obstacle in position
so the door can not be closed.

Please do not do this!

DNA analysis is in progress on your finger prints.

Attachment 1: cablkill.png

Attachment 2: cablkll2.png

876

Mon Aug 25 10:51:06 2008

psl headtemp is coming down

The laser water cooler was overflowing this morning.
I removed 500 cc water from the chiller.

The 4 days plot shows clearly:
that the capacity of the chiller is depending on the water level.
Overflowing water is a heat load for the chiller, so laser head temp goes up.

Attachment 1: ht4dw.jpg

885

Tue Aug 26 09:58:59 2008

This is the picture of ETMX from the upper south west viewport

Attachment 1: etmx-d40posg_012.jpg

Attachment 2: etmx03.jpg

887

Tue Aug 26 15:06:16 2008

Pumpdown 66 PRM-maglev vac normal -day 11
short form: pd66PRM-m-d11

Attachment 1: RGA-0808260125.png

901

Fri Aug 29 15:01:45 2008

MOPA_HTEMP in increasing

The laser chiller temp is 21.9C ( it should be 20.0C )
Control room temp 73F ok, no obvious block

Ops, there is a piece of paper blocking the intake of the chiller

This is a four day plot. The paper was blocking the air flow all day.

Attachment 1: htcl.jpg

911

Tue Sep 2 10:09:03 2008

head temp is cooling down

The chiller was over flowing this morning.
800 cc of water was removed.
PSL-126MOPA_HTEMP peaked at 20.7 C (normal is 18.7 C)

931

Fri Sep 5 08:34:03 2008

The MC is happy.
The MZ can be locked if you move the slider by hand.

Attachment 1: mzhv.jpg

933

Fri Sep 5 10:36:34 2008