ITMX OSEMs   UL 1.8V,   UR 1.7V,   LR 0V,   LL 0V,   SD 1.3V  at the same bias setting shown above. May be a lose earth quake tip?or magnet is touching?

All fine, except ITMX_sensor_UL's  60  counts deep hoop for an hour.

Jamie and Steve

We closed ITMX and ITMY chambers and started pumping around 11am

What we did before:

1, turned off AC power  to PZT Jena HV ps

2, checked jam nut positions

3, cheched  single o-ring shims

4, closed psl out shutter

 ITMY has been upgraded  here I have the new lenses on hand to do the others when it fit into the schedule.

 We are at 30 Torr of 7 hours of pumping with 2 roughing pumps.

Kiwamu will take over the rest of the roughing today. He will keep an eye on  the pumping speed to be  ~1-2 Torr/min  and open up the manual RV1 valve if needed.

The present status is #3023 of  "chamber open to vacuum open" mode and waiting the P1 pressure to drop to 500 mTorr

He will do the following to stop pumping at P1 = 500 mTorr

1, close V3

2, close RV1 with torque wheel

3, turn off PR1 & 3

4, disconnect metal hose between RV1 and PR3

 I will start the Maglev tomorrow morning.

Vacuum status:  " vacuum normal"   CC1 pressure 5e-5 Torr

Slow roughing through butterfly valve took 11 hours at 1-2 Torr/min speed.  We had a leak at the metal hose connecting o-ring  that became visible  at 200 Torr.

The vacuum envelope pressure rose to 500 mTorr from 450 mTorr  This is 50 mTorr leak plus outgassing over 11 hrs  over night stop =  5  mTorr /  hr

Atm2, Maglev pumpdown details. P2 and P3  are in the foreline of the Maglev. The pressure peaks at 4 Torr beacause the 3 drypumps have  little pumpimg speed at this range.

            External fan is turned on during this one hour period to prevent  Maglev turbo from overheating.

            Same things are  happenning with the two small TP2 and TP3 pumps under load. Their foreline pressure peak at 1 Torr.  They slow down to 45 K RPM from 50K RPM  and warm up to 36-39 C

Precondition: 36 days at atm

We tried not to open chambers above 10,000 particles of 0.5 micron cf/min

New items going in:                       2 rasor beam traps, 5 badly oxidized old silver plated  setscrew with spring loaded tips......to be replaced in the future, viton tips for eq screws....some are lose, gold plated allen wrench installed at ITMX bottom, reglued magnet on ITMX

Bad hardware things found:          nylon ball "locking elements" on OSEM locking set screws with screwdriver  slot, lose  1064 nm filter on OSEM pd

 Old Coherent diode laser was replaced by Uniphase HE/NE 1125P at ITMX.

Newport 10B20NC.1 broadband beam sampler set up as beamspitter to dump 90% of the light into beam trap. Beam in to test mass  0.7 mW ,  returning to qpd 0.07 mW  = ~ 3,700 counts

f 1.5 m lens placed into ingoing beam path to reduce the spot size on the qpd.         ITMY oplev will be done in this manner tomorrow.

* IP-ANG is lost with the Piezo Jena PS

* IP-POS cable have to be found at the LSC rack

The PRM damping was restored at side sensor var 1050

Jeff has changed our AC filters inside the lab this morning. Now he is checking on the main filters at CES.  He will finish the roof units tomorrow.

Met One #1 counter is on the top of IOO chamber.  It is measuring 1 and 0.5 micron size particles.  One year of lab condition plot below.

 The PRM sus damping restored.

Paul, Mirko and Katrin visiting grad students received the 40m basic safety training.

RGA scan with maglev pumping speed at day 14 of the pump down.

The larger inserted box contains the tuning parameters of the SRS  200 amu RGA

APC Smart -UPS 2200   model: SUA2200RM2U   batteries were replaced by compatible RBC43, 8x  12V5A

The arm's CCD cameras were reset as picture shows last week.

The height adjustment only works at ITMX. Short post holders are ordered to make this feature  available on the rest.

The 75 ohms video and power supply cables are stress relieved. Solid cover can be attached now without  miss aligning cameras.

ITMY suspention damping restored

 I'm turning  the sus damping  off for Dsub connection fix at  the back of 1X5 rack

The plan is to install 4-40 jack screws to lock connector positions.

All dewittening(or called coil driver) and wittening D sub connectors are locked with two 4-40 socket head screws

Kiwamu and Steve,

This is one of the better oplev set up we have. Single bounce from TM, no mirror on stack. One lens and one  mirror on ISCT. Old Uniphase 1103P laser on heafty 3" od mounts.

Somewhat  big ~5-6 mm spot on qpd in  1,300 counts.

The intensity noise effect can be seen at 1 Hz and 3-20 Hz

Oplev servo was OFF

I failed to start Rana's favorit anciant desktop computer at the vac rack. He has to baby this old beast just a little bit more.

Vacuum status: Vac Normal was reached through Farfalla: Rga was switched back to IFO and and Annuloses are beeing pumped now.

V1 was closed for about a day and the pressure reached  ~2.8 mTorr in the IFO.  This leakrate plus outgassing is normal

The ref cavity 5000V was turned on.

The only thing that has to be done is to restart the RGA. I forgat to turn it off on Friday.

 c1lsc and c1sus are still down. Only ETMX and ETMY are damped

JDSU 1103P died after 4 years of service. It was replaced with new identical head of 2.9 mW output. The power supply was also changed.

The return spots of 0.04 mW  2.5 mm diameter on qpds are BS  3,700 counts and PRM 4,250 counts.

Kiwamu and Steve,

The He/Ne oplev shows no coherece so relative intensity noise is not limiting factor for the oplev servo

The SRM bounce peak 18.33 Hz. Suresh helped me to retune filter through Foton, but we failed to remove it.

ITMX_OPLEV_PERROR shows high coherence with oplev laser. This is our lousiest set up. I will work on it next week.

Generally speaking we can say that JDSU-Uniphase 1103P and 1125P laser intensity noise do not limit oplev servo performance.

However, the overall well being of filters, gain settings, beam sizes on qpds are poor.

 I lost UL osem voltage this morning when I was checking the actual connection at rack ETMY

This after noon I disconnected  the 64 pins IDE connector from satelite amp at the rack, and the two 25 pins Dsubs at this juction board.

UL OSEM recovered after reconnecting these three connectors.

Atm3, bad connection.........noisy UL

 Atm2 is before optical path adjustment. The idea was to remove possible clipping in vacuum.

Coherense significantly reduced below 4 Hz

Today I will replace the He/Ne laser 1125P with 1103P

 I replaced the JDSU-Uniphase 1125P by 1103P He/Ne laser. This new laser had 2.8 mW output yesterday. It degraded to 0.5 mW by this morning.

The beam size on the QPD is ~3 mm  This should give us  better sensitivity. These are not the perfect lenses at all, but we have them here.

On the other hand, there are still some coherence below 1 Hz, so the laser intensity noise or clipping dominating  this  part of the spectrum.

 ETMX oplev had 6 mm diameter beam on the qpd.  I relayed the beam path with 2 lenses  to get back  3 mm beam on the qpd

BRC 037  -100 Bi _concave lens and PCX 25  200 VIS do the job. Unfortunately the concave lens has the AR 1064.

Sorry Kiwamu, I realized too late that you were freeswigging. Hopefully 4 hrs was enough.

 Coherence at 1 and 2-3 Hz only. He/Ne laser intensity noise is not an issue.

The ETMY  shutter can be remotely switched from medm screen POY of mechanical shutters.

The new cable from ETMY controller goes to east vertex EV-ISCT where it is connected to POY shutter hook up BNC cable.

First aid kits are located close vicinity of entry doors and under circuit breaker panels.

 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.

In order to move the emergency shut off switch in room 103 I had to turn off the 2 W Innolight laser. This job will take an hour.

 It is back on.

CANCELLED, WILL BE RESCHEDULED*

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.

 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

                 FACILITIES MANAGEMENT

            UTILITY & SERVICE INTERRUPTION

**PLEASE POST**

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

Interruption:     ELECTRICITY

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 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.