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  40m Log, Page 287 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  1620   Fri May 22 01:27:14 2009 peteUpdateSUS200 days of MC3 side Looks like something went nuts in late
April.  We have yet to try a hard reboot.
 mc3_side_200days.png 
  1796   Mon Jul 27 14:12:14 2009 ranaSummarySUSTM Coil Noise SpectraRob noticed that the ITMY DAC channels were
saturating occassionally. Looking at the
spectrum we can see why.
 Coils.pdf 
  2024   Tue Sep 29 23:43:46 2009 robUpdateSUSITMY UL OSEMWe had a redo of elog entry 975
tonight.  The noisy OSEM was fixed by
jiggling the rack end of the long cable. 
 ITMYosemBAD.pdf 
  2031   Thu Oct 1 08:37:43 2009 steveUpdateSUSsuspention damping restored and MZ HV stuckEarthquake 
of magnitude 5.0  shakes ETMY loose.
MC2 lost it's damping later.
 eq5oct1.jpg 
  2034   Thu Oct 1 11:39:47 2009 JenneUpdateSUSMC2 damping restored again

    
        
  
  2036   Thu Oct 1 14:22:28 2009 robUpdateSUSall suspensions undamped

    
        
  
  2039   Thu Oct 1 19:18:24 2009 KojiUpdateSUSall suspensions undampedOps. I restored the damping of the suspensions
at around 16:30.

  
  2193   Fri Nov 6 12:56:30 2009 HaixingUpdateSUSMagnet has been levitated  

 DSC_0964.JPGblock_diagram.PNG 
  2204   Sun Nov 8 14:18:25 2009 AlbertoUpdateSUSETMY Watchdogs trippedThis afternoon I re-enabled the ETMY coils
after I found that the watchdogs for the mirror had
  
  2207   Mon Nov 9 08:43:16 2009 steveUpdateSUSMC2 damping restoredMC2 damping restored,  MZ locked and
the arms are flashing now.
  
  2246   Thu Nov 12 01:18:34 2009 haixingUpdateSUSopen-loop transfer function of mag levi system (comparison between simulink and measurement)I built a Simulink model of the magnetic
levitation system and try to explain
the dip in the open-loop transfer function
 block_diagram.pngcontribution_plot.pngmech_resp_plot.png 
  2274   Mon Nov 16 15:18:10 2009 haixingUpdateSUSStable magnetic levitation without eddy-current damping


 mag_levi_new.jpgblock_diagram_new.png 
  2280   Tue Nov 17 11:09:43 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACI have connected ETMY sus electronics to
megatron ADC/DAC.
We continue this state until 15:00
  
  2281   Tue Nov 17 13:39:37 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DAC0) Now the connection for the ETMY suspension
was restored in a usual state. It damps
well.
  
  2282   Tue Nov 17 15:23:06 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACOK.
Now, Timing/ADC/DAC are working. It's almost
there.
1) As a temporaly
  
  2285   Tue Nov 17 21:10:30 2009 KojiConfigurationSUSETMY suspension conencted to megatron ADC/DACKoji, Rana
The megatron DAC was temporaly connected
to the suspension electronics for the DAC
  
  2287   Tue Nov 17 21:21:30 2009 robUpdateSUSETMY UL OSEMHad been disconnected for about two weeks. 
I found a partially seated 4-pin LEMO cable
coming from the OSEM PD interface board. 
  
  2290   Wed Nov 18 11:27:33 2009 Koji, josephbConfigurationSUSETMY suspension conencted to megatron ADC/DAC

    
        
  
  2291   Wed Nov 18 12:33:30 2009 Koji, josephbConfigurationSUSETMY suspension conencted to megatron ADC/DACHurraaaah!
We've got the damping of the suspension.
The Oplev loops has also worked!
The
 Untitled.png 
  2293   Wed Nov 18 16:24:25 2009 peteConfigurationSUSETMY suspension conencted to megatron ADC/DAC/cvs/cds/caltech/target/fb/daqd -c daqdrc
This starts the FB.
Now the dataviewer and DTT work!
  
  2307   Fri Nov 20 11:32:48 2009 HaixingUpdateSUSMagnetic levitationI added an integrator to increase
the gain at low frequencies (below 5 Hz).
In addition, I increased
 IntDiff.PNGS8007340.jpgS8007333.jpg 
  2309   Fri Nov 20 16:18:56 2009 robConfigurationSUSwatchdog rampdownI've changed the watchdog rampdown script
so it brings the SUS watchdogs to 220, instead
of the 150 it previously targeted. 
  
  2313   Mon Nov 23 11:03:00 2009 steveUpdateSUSjackhammer special well under control


   
        
            
 dig10d.pngP1050740.JPG 
  2331   Wed Nov 25 12:28:22 2009 JenneUpdateSUSMC2 trippedJust felt a big "kerplunk" type
ground-shaking, presumably from all the antics
next door.  MC2's watchdog tripped as
  
  2363   Tue Dec 8 03:53:49 2009 kiwamuUpdateSUSFree swinging spectra of ETMX In this night, I checked the free swinging
spectra of ETMX to make sure nothing wrong
with ETMX by the wiping.
 ETMX_air.png 
  2368   Tue Dec 8 23:13:32 2009 kiwamuUpdateSUSfree swinging spectra of ETMY and ITMXThe free swinging spectra of ETMY and ITMX
were taken after today's wiping, in order
to check the test masses.
 SUS-ETMY.pngSUS-ITMX.png 
  2369   Wed Dec 9 00:23:28 2009 KojiUpdateSUSfree swinging spectra of ETMY and ITMXWhere
is the plot for the trend?
It
  
  2372   Wed Dec 9 17:51:03 2009 kiwamuUpdateSUSwatchdogsPlease do not touch
the watchdogs for all SUSs except for MCs,
  
  2374   Wed Dec 9 21:09:28 2009 kiwamuUpdateSUSRe: free swinging spectra of ETMY and ITMXOkay, now the data are attached. At that
time I just wanted to say like the follower.
- - -
 Pitch-Yaw_modes.png 
  2375   Thu Dec 10 00:46:15 2009 KojiUpdateSUSRe: free swinging spectra of ETMY and ITMXWell, I get the point now. It could
be either seismic or change in the suspension
Q.
  
  2391   Thu Dec 10 17:13:36 2009 kiwamuUpdateSUSFree swiging spectra under the atmospheric pressureThe free swinging spectra of ITMs, ETMs,
BS, PRM and SRM were measured last night
in order to make sure that nothing wrong
 summary_freeswing.pdf 
  2405   Sun Dec 13 17:43:10 2009 kiwamuUpdateSUSfree swinging spectra (vacuum)The free swinging spectra of ITMs, ETMs,
BS, PRM and SRM were measured under the vacuum-condition.
The attachment are measured spectra.
 summary_FreeSwinging_vacuum.pdf 
  2433   Sun Dec 20 14:34:24 2009 KojiUpdateSUSETMY watchdog tripped Sunday 5:00AM localIt seemed that the ETMY watchdog tripped
early Sunday morning.
The reason is not known. I just looked
 Y.png 
  2457   Mon Dec 28 12:35:57 2009 JenneUpdateSUSMC2 is having a bad dayMC2 is having a bad day, and I'm not yet
sure why.  It's to do with the damping
though.  When the damping is off, after
  
  2458   Mon Dec 28 12:45:55 2009 KojiUpdateSUSMC2 is having a bad dayThe MCL path of MC2 was in a strange state
as the filters were activated as if it is
in lock even though we had no lock. So I
  
  2494   Sun Jan 10 13:32:09 2010 HaixingUpdateSUStransfer function measurement of the quadrant maglev circuit I have assembled the circuit and the
control box for the quadrant magnetic
levitation yesterday. The final setup
 6x 
  2495   Sun Jan 10 15:47:26 2010 KojiUpdateSUStransfer function measurement of the quadrant maglev circuit 1. Why do all of the BNCs have no GND connection?
Each should have the individual cables to
the ground. Each signal line and the corresponding
  
  2497   Sun Jan 10 16:50:34 2010 HaixingUpdateSUStransfer function measurement of the quadrant maglev circuit

    
        
  
  2498   Sun Jan 10 17:15:25 2010 KojiUpdateSUStransfer function measurement of the quadrant maglev circuit 1. Yes. That is the bad. You should eventually
replace the BNCs to the isolated ones.
2. OK. I like to emphasize again
  
  2510   Tue Jan 12 13:24:50 2010 HaixingUpdateSUSQuadrant Magnetic LevitationI have tried to make the quadrant magnetic
levitation work but unfortunately I did
not succeed. During the experiment, I
 schmematic.png 
  2574   Fri Feb 5 14:31:46 2010 JenneUpdateSUS2 SOS towers assembled[Jenne, Kiwamu]
The 2 SOS towers for the ITMs have
been assembled, and are on the flow bench
 DSC_1156.JPG 
  2641   Thu Feb 25 19:59:50 2010 KojiConfigurationSUSITMX OSEMsKoji, Steve
ITMX OSEM CONFIGURATION
 
 osem_config_ITMX.png 
  2651   Tue Mar 2 23:11:43 2010 KojiUpdateSUSITMX hungJenne and Koji
We successfully hung ITMX on the
SOS. Side magnet is ~2mm off from the center
  
  2652   Wed Mar 3 02:57:29 2010 JenneUpdateSUSITMX hung


   
        
            
  
  2658   Fri Mar 5 11:21:18 2010 steveUpdateSUSused OSEMs are magnetic


   
        
            
  
  2659   Fri Mar 5 18:04:56 2010 ranaUpdateSUSused OSEMs are magneticThe OSEM LEDs and PDs from Honeywell have
always had some ferromagnetic material in
them. These are the same OSEMs we had since
  
  2668   Thu Mar 11 17:51:04 2010 KojiUpdateSUSRecent status of SOSsJenne, Koji
Recent status of SOSs:
  
  2677   Tue Mar 16 09:37:30 2010 steveUpdateSUSeq 4.4 seen by oplevs and osemsThe oplev plots clearly show the alignment
effect of this eq.
 opleveq4.4.jpgeq4.4.jpgopleveq4.4d3.jpg 
  2717   Sat Mar 27 16:23:10 2010 KojiUpdateSUSanother SRM sidemagnet gluedKiwamu and Koji
Last night we have released PRM from
the gluing fixture. All of the six magnets
  
  2730   Mon Mar 29 18:41:34 2010 KojiConfigurationSUSStarted to build TTsSteve and Koji
WE started to build 5 TTs. 4 of them
are used in the recycling cavities. One is
 IMG_2348.jpg 
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