| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2582
|
Tue Feb 9 10:10:58 2010 |
Alberto | Update | ABSL | back to analog | I want to try to do the measurement with
the network analyzer used as local oscillator,
instead of the Marconis that I'm using now. |
|
|
2604
|
Tue Feb 16 09:51:22 2010 |
Alberto | Update | Green Locking | take some optics away from the ETM end table |
|
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|
2605
|
Tue Feb 16 10:01:16 2010 |
Alberto | Configuration | LSC | Arms and PRC not locking | Since last Friday either the arms or the
PRC can't lock.
The montors show the beam flashing |
|
|
2608
|
Tue Feb 16 15:25:00 2010 |
Alberto | Configuration | LSC | Arms and PRC not locking |
|
|
|
2640
|
Thu Feb 25 15:49:05 2010 |
Alberto | AoG | CDS | New IO Chassis for the new CDS | Yesterday Kiwamu and I went to Downs
to take all the available parts of the IO
chassis that Gary and I had put together |
|
|
2653
|
Wed Mar 3 18:32:25 2010 |
Alberto | Update | 40m Upgrading | 11 MHz RFPD elctronics | ** Please
add LISO file w/ component values.
|
|
|
2655
|
Thu Mar 4 08:43:35 2010 |
Alberto | Update | 40m Upgrading | 11 MHz RFPD elctronics |
|
|
|
2656
|
Thu Mar 4 19:53:56 2010 |
Alberto | Update | 40m Upgrading | 11MHz PD designed adjusted for diode's resistance; 55 MHz RFPD designed | After
reading this study done |
6x |
|
2680
|
Thu Mar 18 12:27:56 2010 |
Alberto | Update | ABSL | PLL reconstructed |
|
|
|
2702
|
Tue Mar 23 15:38:26 2010 |
Alberto | Update | elog | elog just restarted | I found the elog down and I restarted it.
Then, after few seconds it was down
again. Maybe someone else was messing with |
|
|
2704
|
Tue Mar 23 22:46:43 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded | I modified REFL11 according to the changes
lsited in this
schematic (see wiki / Upgrade 09 |
|
|
2710
|
Wed Mar 24 14:52:02 2010 |
Alberto | Update | Green Locking | two NPRO PLL |
|
|
|
2711
|
Wed Mar 24 14:57:21 2010 |
Alberto | Update | 40m Upgrading | REFL11 upgraded |
Hartmut suggested a possible
explanation for the way the electronics transfer |
|
|
2715
|
Thu Mar 25 17:32:42 2010 |
Alberto | Update | 40m Upgrading | REFL55 Upgraded | I upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old
photodiode inside, switching to a 2mm one. |
|
|
2732
|
Mon Mar 29 21:43:27 2010 |
Alberto | Configuration | PSL | Reference Cavity PD Noise Spectrum | [Rana, Alberto]
This evening we measured the noise
spectrum of the reference cavity PD used |
|
|
2758
|
Fri Apr 2 08:52:21 2010 |
Alberto | Update | elog | elog restarted | i just restarted the elog for the third
time in the past 12 hours.
I checked the elog.log file to debug |
|
|
2760
|
Sat Apr 3 16:07:40 2010 |
Alberto | Configuration | PSL | Reference Cavity PD Noise Spectrum | I was aware of a problem on those
units since I acquired the data. Then it
wasn't totally clear to me which were the |
|
|
2761
|
Sat Apr 3 19:54:19 2010 |
Alberto | Update | 40m Upgrading | REFL11 and REFL55 PDs Noise Spectrum | These are the dark noise spectrum that
I measured on the 11MHz and 55MHz PD prototypes
I modified. |
|
|
2763
|
Sun Apr 4 17:32:07 2010 |
Alberto | Metaphysics | General | new y-arm? |
|
|
|
2767
|
Mon Apr 5 10:23:40 2010 |
Alberto | Update | 40m Upgrading | REFL11 Low Frequency Oscilaltion Reduced | After adding an inductor L=100uH and a
resistor R=10Ohm in parallel after the OP547A
opamp that provide the bias for the photodiode |
|
|
2768
|
Mon Apr 5 10:33:12 2010 |
Alberto | Omnistructure | Electronics | soldering iron broken | This morning the pencil soldering iron
of our Weller WD2000M Soldering Station suddenly
stopped working and got cold after I turned |
|
|
2772
|
Mon Apr 5 13:52:45 2010 |
Alberto | Update | Computers | Front-ends down. Rebooted | This morning, at about 12 Koji found all
the front-ends down.
At 1:45pm rebooted ISCEX, ISCEY, |
|
|
2775
|
Tue Apr 6 11:27:11 2010 |
Alberto | Update | Computer Scripts / Programs | Data formats in the Agilent AG4395a Spectrum Analyzer | Lately I've been trying to sort out the
problem of the discrepancy that I noticed
between the values read on the spectrum analyzer's |
|
|
2776
|
Tue Apr 6 16:55:28 2010 |
Alberto | Update | Computer Scripts / Programs | Data formats in the Agilent AG4395a Spectrum Analyzer |
|
|
|
2779
|
Wed Apr 7 10:48:04 2010 |
Alberto | Update | Electronics | REFL11 Noise Simulation | LISO simulations confirm the estimate
of ~15nV for the noise of REFL11.
The
largest contribution comes from the 50Ohm |
|
|
2781
|
Wed Apr 7 11:11:19 2010 |
Alberto | Update | Electronics | REFL11 Noise Simulation |
|
|
|
2782
|
Thu Apr 8 10:17:52 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | From the measurements of the 11 MHz RFPD
at 11Mhz I estimated a transimpedance of
about 750 Ohms. (See attached plot.) |
|
|
2783
|
Thu Apr 8 10:24:33 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2785
|
Fri Apr 9 06:45:28 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2786
|
Sun Apr 11 13:51:04 2010 |
Alberto | Omnistructure | Computers | Where are the laptops? | I can't find the DELL laptop anywhere in
the lab. Does anyone know where it is?
Also one of the two netbooks is missing. |
|
|
2789
|
Mon Apr 12 16:20:05 2010 |
Alberto | Configuration | 40m Upgrading | REFL55 improved | During the commissioning of the AS55
PD, I learned how to get a much better rejection
of the 11MHz modulation.
So I |
|
|
2790
|
Mon Apr 12 17:09:30 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
2834
|
Thu Apr 22 21:42:24 2010 |
Alberto | Update | PSL | Innolight 2W Vertical Beam Profile |
What kind of fit did you use?
How are the uncertainties in the parameters |
|
|
2856
|
Wed Apr 28 14:15:58 2010 |
Alberto | Update | IOO | MC alignment |
That's interesting.
Would it be possible to write about |
|
|
2874
|
Mon May 3 19:21:43 2010 |
Alberto | DAQ | Environment | Boot fest | [Alberto, Koji, Rana]
The RFM network failed today. We
had to reboot the frame builder anf restart |
|
|
2882
|
Wed May 5 16:32:39 2010 |
Alberto | Update | 40m Upgrading | New REFL55 PD, 11MHz rejection | Here's the (calibrated) transimpedance
of the new REFL55 PD.
T(55.3) / T_(11.06) = 93 dB |
|
|
2886
|
Thu May 6 16:18:37 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode | After munching analytical models, simulations,
measurements of photodiodes I think I got
a better grasp of what we want from them, |
|
|
2893
|
Thu May 6 19:57:26 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
|
|
|
2896
|
Fri May 7 18:18:02 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
|
|
|
2902
|
Mon May 10 16:59:35 2010 |
Alberto | Update | 40m Upgrading | Unexpected oscilaltionin the POY11 PD | The measured transimpedance of the latest
POY11 PD matches my model very well up to
100 MHz. But at about ~216MHz I have a resonance |
|
|
2906
|
Mon May 10 19:29:33 2010 |
Alberto | HowTo | Electronics | New Focus 1811 PD calibrated against New Focus 1611 PD | I measured the output impedance of the
New Focus 1611 PD (the 1GHz one) and it is
50 Ohm for both the DC and the AC output. |
|
|
2924
|
Wed May 12 17:10:16 2010 |
Alberto | Update | 40m Upgrading | RF frequency generation box - step 0 | I started putting together the components
that are coint to go inside the frequency
generation box. Here's how it looked like: |
|
|
2925
|
Wed May 12 23:31:17 2010 |
Alberto | Update | 40m Upgrading | 216 MHz resonance in the POY11 PD killed | It turned out that the resonance at 216
MHz in the 11MHz PD that I showed in the
elog entry 2902 |
|
|
2966
|
Fri May 21 11:56:34 2010 |
Alberto | Update | 40m Upgrading | 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. | I update my old 40mUpgrade Optickle model,
by adding the latest updates in the optical
layout (mirror distances, main optics transmissivities, |
7x |
|
2969
|
Fri May 21 16:27:45 2010 |
Alberto | Omnistructure | Environment | The control room is molding... | ... not just because we haven't locked
the interferometer for quite some time. I
mean, it literally stinks. The chiller's |
|
|
2994
|
Wed May 26 17:10:09 2010 |
Alberto | Update | 40m Upgrading | RF Generation box | This is how the RF generation box might
soon look like:
|
|
|
2996
|
Wed May 26 22:22:03 2010 |
Alberto | Configuration | 40m Upgrading | Arm cavity length | The second sideband is resonant in the
arms for a cavity length of 37.9299m.
The nearest antiresonant arm lengths |
|
|
3001
|
Thu May 27 12:52:02 2010 |
Alberto | Update | 40m Upgrading | Arm lengths |
For both sidebands to be antiresonant
in the arms, the first modulation frequency |
|
|
3004
|
Fri May 28 07:13:05 2010 |
Alberto | Frogs | Green Locking | SR785 found abandoned next to the workbenches | A poor lonely SR785 was found this morning
roaming around in the lab in evident violation
of the fundamental rule which requires all |
|
|
3012
|
Fri May 28 21:32:32 2010 |
Alberto | Update | 40m Upgrading | MC alignment | [Alberto, Kiwamu, Kevin, Rana]
Today we tried to measured the beam
shape after the MC MMT1 that Jenne installed |
|