Bryan Barr is visiting us from Glasgow for a month. He received 40m specific safety training on Friday.

Solid door, numbered 4 at south west corner of PSL enclosure was replaced by laser protective window.

The carpenter shop's Mark is making 4 more identical ones for the east side.

The Lightwave NPRO126 of 700mW was moved from the AP-table into the PSL-enclosure temporarily.

It's emergency shutdown switch can be seen at the center bottom picture

The 40m lab was visited by  ~ 30 LSC members  the end of last week.

Suresh is captivating his audience with gravity waves on last Friday, March 25

I strain relieved RF cables labeled 33 MHZ LO and 166 MHZ to EOM at 1X2  This is a temporary setup for the 11 MHZ

The coax N  bulkheads connectors are mounted on the plastic front panel now.

Mike Caton of Konecranes inspected and loadtested all 3  of the 40m cranes at max reach trolley positions with 1 ton.

 Low power green-red laser pointers are in. High power green, red and blue pointers are confiscated.

The PSL enclosure now have 4 windows on each side. The bottom rail guides on the east side will be replaced by  one  U-channel for smoother, more gentle sliding.

Door position indicator- interlock switches are not wired yet.

 Konecrane representative gave crane operator training in the 40m. Koji has become a qualified, trained crane operator of the 40m lab.

The east side window guides  will be replaced by one long U-channel. There will be drilling into 2x2 steel frame. It should be done by 2pm today

This should remove the jerking motion of windows hitting the individual guides.

New right angle PVC, 2 x 2 x  1/4" installed at the AP table to strain relief the 1/4" spiral corrugated RF coaxes.

The anti aliasing box was opened up at the back to accommodate the junction board and the SCSI cable towards the ADC. Aluminum plate was attached to the bottom to hold the strain relief clamp.

Three more hanging junction cards will be replaced in this manner.

 The installation went smoothly. There will be no more banging the doors into  guides on the east side.

Atm2 showing the west side as is today

.....Happy.... Birthday.... to.... Joseph... and... Jamie...Happy....Birthday..... to.... You............sing with us........Happy Birthday.....to you

The returning spot diameter on the qpd ~10 mm. In order to reduce the spot size I moved the f 1145 mm lens toward the PRM ~ 25 cm. The spot size was reduced to ~8 mm, 3200 counts.

I'll try to find an other lens tomorrow.

The little red all terrain cargo wagon 40" x 18"  has just arrived on pneumatic wheels.

Model #29, 200 lbs max load at 26 PSI,  minimum age requirement 1.5 years

 Atm 1,  PRM oplev inward path with 2 lens solution: 14 cm gap between F 1145 and F 1545 mm lenses. 

Atm 2,   The PRM beam size 3 mm and the beam  quality is still bad. The BS path only needed alignment.

Valera and I installed the the temp sensor and the interface box that Rana fixed. This may help with diagnosing the PSL drift.

 I was wrong. Rana did not fix the interface box. I removed the interface box and turned down the HEPA flow  from 100 to 20% on the Variac.

New right angle PVC front panel with SMA bulkhead connectors are in place. The connections are still lose. It is ready for Suresh to finalise his vision on it.

The emphasis of this annual safety audit  was on  safe  electrical housekeeping on March 3, 2011

Dry fore pump of TP3 replaced by brand new Varian SH-110  at  1.1 Torr_75,208 hrs

The annuloses were closed off for 25 minutes. We are back to VACUUM NORMAL mode.

The TP3 fore line pressure dropped to 44 mTorr at 25 minutes in operation.......9.4mTorr at day 2 with full annulos load

The SRM qpd cable was removed from the BS-table. It's path was changed from 1x4 to ITMY-table following the inner cable tray.

Valera and I placed F 572.7 mm lens ~15 cm away  from the ang  qpd (in the same mount with ND filter) so that two qpds see different combination of ang and pos motion - there was no lenses prior to this change. The beam diameter is reduced to ~half .

 The dead laser was replaced by new JDSU 1103P of  2.6mW. The return beam is big ~5 mm diameter of 0.3 mW,  1400 counts

 Laser diode oplev SRM is working. Qpd matrix values were reset like others.

In 0.44mW, returning 0.1mW,  -500 counts.

Aux- rack _1Y2 is just behind 1Y3  It contains Kepco Analoge DC power supplies for +- 5, 15 and 24V

Placing these power supplies away from the LSC rack was an effort to minimize pick up from them.

 I found the disconnected cable, but I do not see the interface board at the LSC rack

I found ITMX-ISCT and BS-ISCT ( IFO sensing-control table)  not covered this morning. Please do not leave tables open.

1X1 is strain relieved in the back. I will use similar approach on the rest of the racks .

 Job is done. Sus damping are back on. Cabling-strain reliefing are  not finished yet at 1X5 and 1X4

LSC rack 1Y2 cables are strain relieved and labeled. Spare and/or obsolete cables are laid out on the top of the beam tube and on the outside of the rack.

The POY 110 MHZ demodboard has a very touchy position in the VME crate. Watch out for it! It has to be fixed.

  1064 nm transmison were measured of 40m safety glasses as shown . Their performance did not degrade. They are as good as their labels.

ETMY's watch dogs were found tripped. They were restored.

AA filter box was removed and modified at 1Y7 today. The -5V power supply was current limited when I plugged it back in. It was removed for medical attention.

NO PEM channels available! because of this.

 D68L8EX-850Hz filter chips were removed and bypassed-shorted as Rana's entry on March 17, 2006 in old elog.

This unit is still has a short somewhere.

Computar  75-12.5 zooms were installed for closer look at the resonant spots.  Their alignment and focus needs more loving adjustment.

Atm 1, ITMX  (  it was 10-40 mm Tamron before )

Atm 2, ITMY  ( it was 12mm wide angle showing the towers  before )

The PMC is losing power.

 Are we keeping these?

 I shut down damping to the Vertex optics and removed Binary IO  Adapter chassy BO0 and BO1

About a week ago I discussed the BO0's power indicator lights with Kiwamu. They were  not on or they were blinking on-off.

I put screws into ps connectors in the back, but it did not helped.

ITMY sus damping restored.

ETMX sus damping restored

 Put the serial numbers into the elog. So we can identify the laser and controller in the future.

The old days the NPRO ( inside the MOPA ) was running ~1.7A  500 mW

40m surfs:  Nicole Ing, Iswita Saikia and Sonali Mohapatra received 40m specific safety training  today.

Access to the north side of the PSL table is blocked by the    8" beam guard. This opens the beam pathways between them.

Rod Luna picked up these computers for Larry Wallace yesterday: Dell Inspiron 530, Dell Dimension 4600 and SunBlade 1000

The PRM sus damping restored. C1:SUS-PRM_SDPD_VAR is still 20-30mV and going up.  Side gain  turned on. This pulled it down to 5-8 mV

Why is the side osem sensing voltage 4.4V ? It can not be higher than ~2.4V.......something is rotten in the state of Denmark?

Edit by KI:

 It's because Valera increased the transimpedance gain of the PRM SIDE OSEM to match the signal level to the new ADC range (#3913 ).

 Lightwave Laser Head M126-1064-700   sn238,  mounted on full size Al base and side heat sink on

Controller 125/126 Smart Supply   sn 201M

ITMY gets new Tamron M118FM50 that has improved close focusing. It is a small fixed focal length camera so the video tube cover can be put on.

The Watec LCL-902K 1/2" ccd camera was losing it power supply voltage because of bad connection. It was replaced.

He has moved the levitation stuff for his surf student to Jan's lab in W-Bridge.