40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop

40m Log, Page 321 of 348  Not logged in

List |  Find |  Login |  Help

Full | Summary | Threaded | Hide attachments     -- All entries -- Last day Last 3 Days Last week Last month Last 3 Months Last 6 Months Last Year -- Type -- Configuration Update Summary HowTo Bureaucracy Omnistructure Metaphysics Frogs  17364 Entries

Goto page Previous  1, 2, 3 ... 320, 321, 322 ... 346, 347, 348   Next

ID Date Author Type Category Subject   226   Mon Jan 7 09:01:39 2008 steve Update SUS BS sus damping restored The BS sus damping was lost at 8am Sunday morning. Attachment 1: bssdl.jpg   232   Thu Jan 10 10:38:02 2008 steve Update SUS etmy damping restored The IST building onstruction has really started yesterday and continuing today with big heavy ground breaking machinary. The MC is holding lock and the suspentions are hanging on. ETMY does not like this. SUS-MC2_LLPD_VAR monitor is a good indicator of seismic activity on this 12 days plot Attachment 1: etmysus.jpg Attachment 2: sustrend16d.jpg   233   Thu Jan 10 12:08:23 2008 steve Update SUS why did the BS move? Attachment 1: bshopped.jpg   235   Thu Jan 10 15:04:04 2008 steve Update SUS illuminator light effect on BS position The bs chamber illuminator light was turned on this morning and left on. Earlier on Rana noticed that the bs moved. I follwed up to see what happened. I turned off oplev servo and tried to recenter on oplev pd by adjusting pitch and yaw biases. It did not move. I looked at suspention and realized that the illuminator was still on. I turned it off and to my amazement the the AP spot started flashing Attachment 1: bssusilum.jpg   237   Mon Jan 14 14:41:09 2008 steve Update SUS etmy sus damping restored & mz relocked Tree days trend of MZ HV drift is typical these days. So as the etmy sus inability to hold damping for longer then 2-3 days. Attachment 1: etmysus&mzhvtrend.jpg   254   Wed Jan 23 09:27:55 2008 steve Update   etmy sus damping restored Seismis event trips etmy Attachment 1: etmysus.jpg   255   Wed Jan 23 11:41:06 2008 steve Update PEM sulfur smell in 40m Led - acid car batteries were overcharged in the machine shop next door and sulfuric acid smell is coming over to the ifo room. Entry room 103 is specially bad.   258   Thu Jan 24 11:52:56 2008 steve Update PEM the mud is cleaned up & MOPA shutter is opened Safety glasses are required again! I have just opened the mopa shutter. One janitor came to help with muddy floor. Rack 1x1 toward ITMX chamber and the south wall of these area were completely covered by mud. I wiped the floor of bottom of the rack with towels. The cables were lifted and still should be wiped. The bottom of LSC rack got less water, only on the west side. We are ready to bring up the computers. Thanks to ALL with the clean up, including Alan Rice who was really helpful.   264   Fri Jan 25 09:22:21 2008 steve Update PEM burned toast award goes to DYM for collaborating with the enemy. In order to minimize the number of ants visiting our lab we have to take out side the lab all food left over and organic waste. If you are eating here do not expect someone else to clean up after you. Thanks for your cooperation.   299   Wed Feb 6 09:17:31 2008 steve Update PEM IST building construction continoues The bulldosers at work Attachment 1: seismic8d.jpg Attachment 2: seisioo.jpg   308   Mon Feb 11 14:24:19 2008 steve Update PEM more earthquakes ITMX and ITMY sus damping restored after Baja earthquake 5.1 mag at 10:29 this morning. The ground preparation for The ITS building is almost finished. Activity is winding down, however the Baja California_ Mexico earthquake zone "Guadala Victoria" started acting up on Friday. http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/special/California_Nevada_eqs.php Attachment 1: eqfeb11.jpg   322   Tue Feb 19 10:14:13 2008 steve Update VAC rga logging needs help The rga head and controller are running fine, but the data logging is not.   325   Wed Feb 20 11:34:17 2008 steve Update PSL laser head temp is up MOPA head temp is running at 20.3C now Nomally it is at 18.5C Attachment 1: htempup.jpg   326   Wed Feb 20 16:24:37 2008 steve Update PSL the laser is recovering slowly Head temp is still 20.5C and decreasing slowly. Power output 2.9W NPRO power 22 mW is increasing as head is cooling down Attachment 1: laserecoverring.jpg   327   Thu Feb 21 09:56:26 2008 steve Update PSL the laser is back The laser and the psl recovered. The water chiller temp is 19.98C and head temp 18.4C Power 3.2W PMC_T 3.1 c1iovme was restarted and the mc is locking now Attachment 1: laserisback.jpg   335   Fri Feb 22 14:45:06 2008 steve Update MOPA laser power levels At the beginning of this 1000 days plot shows the laser that was running at 22C head temp and it was send to LLO The laser from LHO PA#102 with NPRO#206 were installed at Nov. 29, 2005 @ 49,943 hrs Now,almost 20,000 hrs later we have 50% less PSL-126MOPA_AMPMON power Attachment 1: lpower1000d.jpg   351   Mon Mar 3 09:25:33 2008 steve Update VAC rga scan logging is working now Quote: Quote: The rga head and controller are running fine, but the data logging is not. It should run tonight at 1:25 AM. To get the cron job to work properly on op340m, I had to make wrapper sh script which defines the perl library before calling the actual RGAlogger script. Thanks to Rob, it is working ! The baked, calibrated rga head model# M206M, s/n #c128035 was reinstalled at the 40m ifo on Feb. 8, 2008 Faraday mode dwell time was increased from 2 to 16 sec Rga head temp at top silver gaskit 45.2 C The noise floor is at 1E-12 Torr There is more detail in logbook VMI-14 p 107 pd65-m-d119 Attachment 1: rgalogworks.jpg Attachment 2: cc1.jpg   352   Mon Mar 3 13:58:10 2008 steve Update Computers RFM Network are down The CODAQ_RFNETWORK are down, except C1SUSVME & AWG   365   Fri Mar 7 19:04:39 2008 steve Omnistructure PSL laser pointer Green laser pointer was found in my desk. I blamed Rana for not returning it to me after a conference talk. It is surprisingly bright still. I will bring sweets for Wednesday meeting.   385   Thu Mar 20 15:28:20 2008 steve Update VAC tp2 's drypump replaced The fore pump of tp2 was replaced at fore line pressure 998m Torr   388   Fri Mar 21 09:02:03 2008 steve Update VAC tp 2 failed Small turbo #2 is the forepump of the maglev. It failed last night, shut down the maglev and interlock closed V1 Ifo pressure is 20 mTorr now. The Yarm was still locked at 8am this morning. The PSL beam to MC was blocked just before the output periscope. The psl mechanial shutter did not work from epic screen.   409   Wed Apr 2 15:03:51 2008 steve Update General reflectivity of black glass The reflectivity of black glass, shade 12 was supplied by Donald O'Shea of Emerald Glass Inc., Westlake, OH 44145 The reflectivity of this glass was measured as shown Old 1064 nm Crysta Laser with poor beam quality was the source. Attachment 1: bg12refl.pdf Attachment 2: bg12refsetup.pdf   417   Mon Apr 7 18:58:49 2008 steve Update General reflectivity of SS304 The reflectivity of stainless steel 304 super polished # 8 was measured the same way as elog entry 409 The reflectivity: 74 +- 1 % from incident angle 10 to 80 degrees Attachment 1: ss304s8refl.pdf   418   Tue Apr 8 09:08:54 2008 steve Configuration PEM weather station disconnected We can not leave cables in the walkways and go on vacation. I disconnected the weather station from the DAQ Every Tuesday is janitor day in the 40m. We have to give him free space for doing a good job. Burned toast award goes to Andrey. Attachment 1: toast.jpg   423   Thu Apr 17 15:00:59 2008 steve Update VAC vac controller computer to be replaced Now that Rosalba is up and running someone should step forward to volunteer for this job. Old desk top at the Vacuum Rack should be replaced by a functional less old computer so the vacuum controller can count on an emergency situation. It's only has to be able to run medm The existing one is dying.   443   Thu Apr 24 15:57:53 2008 steve Configuration SAFETY Safety at AP-ISCT I measured the output power of the psl after the mechanical shutter. It was 1.1 W with Ophir power meter, than unlocked the MC and measured the power at the MC-REFL Beam Dump at the AP-ISCT 0.9 W Power on MC-REFL photodiode 92 mW High power metal beam shields were installed around the beam path of MC-REFL between AP-Viewport and MC-REFL Beam Dump. Placed HIGH POWER LASER BEAM PATH warning signs on table frame and top covers. Last week I placed a small monitor on the top of the OOC that monitors the resonant spot of MC2. Please keep an eye on this monitor when working on the AP-ISCT AP table should NOT be left uncovered. One experienced laser operator has to be present if the top is removed and IR-viewer scan required. We need your full cooperation to keep this lab safe. Attachment 1: P1020197.JPG Attachment 2: mcrefl3.JPG   450   Fri Apr 25 15:44:21 2008 steve Update PSL scattering measurments In pursuit of a low back scattering, high power beam dump we looked at materials such: polished copper, polished aluminum, diamond cut aluminum, variety of polished & heat treated stainless steel and shades of black glasses. Black glass is ideal at low power. Superpolished SS 304 #8 is the only material that measures close to bg We are still looking for a conductive low back scattering material that would be ideal for a good high power beam trap. Black glass-shade 12, ss304 superpolished #8 and white paper-B98-24lbs back scattering were compared at 1064 nm Atm 1: data plot numbers from front panel of SR830 display, sensitivity: 1x1 mV for bg and ss 1x1 V for wp Atm 2: drawing of measurement set up Atm 3: SR830 lock.amp settings Atm 4: view from steering mirror Atm 5: view from black glass trap Atm 6: white paper Attachment 1: scatmeas20080425.xls Attachment 2: scattring_set_up_20080425.ppt Attachment 3: sr830settings.pdf Attachment 4: viewfmirror.pdf Attachment 5: viewfbgtrap.pdf Attachment 6: wpnmount.pdf   462   Thu May 1 08:31:51 2008 steve Update SUS earthquake trips etmy & mc1 Earthquake at Lake Isabel magnitude 4.4 at 1am today shakes the 40m ETMY and MC1 watchdogs tripped. Sus damping restored.   465   Mon May 5 15:53:14 2008 steve Update VAC drypump replaced & readbacks are out The small turbo pump of the annulus system is tp3 It's drypump was replaced at 1.4 Torr after 8 months of operation. The rebuilding cost of this SH100 drypump is getting ridiculously high $1349. I'll look for a replacement. Joseph rebooted c1vac2 card on Apr 24 entry#441 This restarted the readbacks of the turbos and ion pumps for a while. That was nice. The readbacks are not working again   472   Fri May 9 08:40:24 2008 steve Update SUS ETMY sus damping restored ETMY lost damping at 19:10 last night. There was no seismic event than. Sus damping was restored this morning.   474   Tue May 13 10:15:52 2008 steve Update SUS restored damping of BS & PRM I think our janitor was cleaning too heavy handedly. The BS and PRM sus damping were lost. They were restored.   475   Tue May 13 10:38:28 2008 steve Update Computers rfm network is down The RFM network went down yesterday around 5pm Only c1susvme1 is alive but it's timing is off. Andrey is bringing the network up. Andrey wants to make an addition first that our situation is very much similar to that described by Rana in his elog entry # 353 (March 03). All of the rectangular boxes are red, except for SUS1-c1susvme1 and AWG (only these two rectangles are green).   478   Thu May 15 10:40:21 2008 steve HowTo General Lisa Goggin, PhD Lisa Goggin successfully defended her thesis on May, 13 2008 "A Search For Gravitational Waves from Perturbed Black Hole Ringdowns in Ligo Data" She started out as a surf student in the 40m. Congratulation! Attachment 1: lisa.JPG   487   Mon May 19 11:49:57 2008 steve Update SUS etmy oplev laser replaced 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 steve Bureaucracy SAFETY 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 steve Bureaucracy SAFETY early surf sudent 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 steve Update PSL kaleidoscope of psl 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 steve Update SUS etmy oplev is back 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 steve Bureaucracy Photos Yoichi has arrived 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 steve Update PSL wedged SS beam trap 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 steve Bureaucracy SAFETY Yoichi received safety training Yoichi Aso received 40m specific safety training.   524   Fri Jun 6 16:10:51 2008 steve Update PSL 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 steve Update PSL 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 steve Update PSL ss trap works 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 steve Update PSL 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 steve Frogs PEM 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 steve Update 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 steve Update Computers RFM network is down   609   Tue Jul 1 10:15:22 2008 steve Update PSL eventfull two days 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 steve Update General added beam traps 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.

Goto page Previous  1, 2, 3 ... 320, 321, 322 ... 346, 347, 348   Next

ELOG V3.1.3-