| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
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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.) |
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2783
|
Thu Apr 8 10:24:33 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
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2784
|
Thu Apr 8 20:53:13 2010 |
Koji | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | Something must be wrong.
1. Physical Unit is wrong for the
second term of "Vn = Vdn + Sqrt(2 e |
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2785
|
Fri Apr 9 06:45:28 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
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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 |
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2795
|
Mon Apr 12 22:44:30 2010 |
Koji | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent | Data looks perfect ... but the fitting
was wrong.
Vn = Vdn + Z * sqrt( 2 e Idc ) |
|
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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 |
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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, |
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2893
|
Thu May 6 19:57:26 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
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2894
|
Fri May 7 11:21:49 2010 |
koji | Update | 40m Upgrading | New improved design for the 11MHz photodiode | How much is the width?
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2896
|
Fri May 7 18:18:02 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
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2897
|
Fri May 7 19:02:27 2010 |
rana | Update | 40m Upgrading | New improved design for the 11MHz photodiode | To measure the width of a resonance, the
standard method is to state the center frequency
and the Q. Use the definition of Q from the |
|
|
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 |
|
|
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: |
|
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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 |
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2926
|
Thu May 13 05:06:43 2010 |
rana | Update | 40m Upgrading | 216 MHz resonance in the POY11 PD killed |
This idea was tried before
by Dale in the ~1998 generation of PDs. Its |
|
|
2957
|
Thu May 20 12:34:46 2010 |
kiwamu | Configuration | 40m Upgrading | optical breadboards with legs | Yesterday Steve and I revived two legs
to mount some optical breadboards outside
of the end table. |
|
|
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 |
|
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:
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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 |
|
|
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 |
|
|
3023
|
Tue Jun 1 06:30:38 2010 |
Koji | Configuration | 40m Upgrading | effect of the arm length | I checked the effect of the arm length
to the reflectance of the f2(=5*f1) sidebands.
Conclusion: If we choose L_arm |
|
|
3094
|
Mon Jun 21 18:01:34 2010 |
Jenne | Update | 40m Upgrading | SRM, PRM hung, magnets inspected | [Jenne, Kiwamu, Rana, Eric Gustafson]
The SRM and PRM have been re-hung,
and are ready for installation into the chambers. |
|
|
3099
|
Tue Jun 22 20:07:08 2010 |
Jenne | Update | 40m Upgrading | First attempt at Tip Tilt hanging | [Jenne, Steve, Nancy, Gopal]
We
made an attempt at hanging some of the Tip |
|
|
3329
|
Fri Jul 30 02:54:04 2010 |
Koji | Update | 40m Upgrading | More optics installed on the BS table | July 29 Thu [Steve, Alberto, Kiwamu,
Koji]
We |
|
|
3332
|
Fri Jul 30 12:46:38 2010 |
Koji | Configuration | 40m Upgrading | BS chamber status | |
|
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4214
|
Thu Jan 27 21:10:47 2011 |
Osamu | Update | 40m Upgrading | Calibrated noise of green | I calibrated noise spectrum of green lock.
1. Measurement of conversion factor
of ADC input from V to ct: |
|
|
5696
|
Wed Oct 19 12:25:58 2011 |
Suresh | Update | 40m Upgrading | Active Tiptilts from LLO moved to clean shelf along X arm | I have moved the active tip tilts that
we brought over from LLO to the Clean Bureau
along the X arm (closest to the ETMX). There |
|
|
5697
|
Wed Oct 19 13:45:11 2011 |
Suresh | Update | 40m Upgrading | Active Tiptilts from LLO moved to clean shelf along X arm | I have moved the active tip tilts that
we brought over from LLO to the Clean Bureau
along the X arm (closest to the ETMX). There |
|
|
7090
|
Mon Aug 6 11:07:06 2012 |
Manasa | Update | 40m Upgrading | Optical layout updated | ACAD files of the 40m optical layout have
been updated as per the vent in Aug 2011.
Files are available at the 40m svn |
|
|
7125
|
Wed Aug 8 20:51:56 2012 |
Manasa | Update | 40m Upgrading | Optical layout updated |
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7222
|
Fri Aug 17 18:49:55 2012 |
Manasa | Update | 40m Upgrading | Optical layout updated |
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7245
|
Tue Aug 21 18:23:58 2012 |
Manasa | Update | 40m Upgrading | ETMX table layout | Optical layout of the current endtable
at ETMX has been updated in the svn repository
(directory: 40M_Optical Layout). This layout |
|
|
7354
|
Thu Sep 6 19:21:58 2012 |
Manasa | Configuration | 40m Upgrading | Baffle problem | For the current baffle (dia. 40mm) centered
along the beamline place at 1.77" from
the test mass, the baffle will allow ~8.6mm |
|
|
7359
|
Fri Sep 7 11:58:12 2012 |
Manasa | Configuration | 40m Upgrading | Baffle problem |
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7361
|
Fri Sep 7 13:01:53 2012 |
Manasa | Configuration | 40m Upgrading | Baffle problem |
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7449
|
Thu Sep 27 19:03:06 2012 |
Manasa | Update | 40m Upgrading | New ETMX layout - Version 1.0 | I am working towards redesigning
the endtables. I've attached the first version
of the layout. As per Steve's comment I've |
|
|
7450
|
Thu Sep 27 20:05:57 2012 |
Koji | Update | 40m Upgrading | New ETMX layout - Version 1.0 | 1. I wonder how the mode profiling/matching
was considered in the new layout.
I can see the distances between the |
|
|
7451
|
Fri Sep 28 07:49:30 2012 |
Steve | Update | 40m Upgrading | New ETMX layout - Version 1.0 | Where is IP-ANG ? It is good
practice to use two mirrors at launching
and detecting the beam, so you can walk it |
|
|
7704
|
Tue Nov 13 11:30:54 2012 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser | I'm set on the mission to get the new bigger endtables setup |
|
|
7705
|
Tue Nov 13 16:18:51 2012 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : Circularize the 1W NPRO beam profile | With reference to measurements made earlier: elog,
Beam parameters for Innolight 1W |
|
|
7706
|
Tue Nov 13 20:13:07 2012 |
Koji | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : Circularize the 1W NPRO beam profile | These fs are too short.
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7726
|
Mon Nov 19 20:03:53 2012 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : ETMX layout on new table | I have attached the possible layout of
the optics on the new ETMX endtable. More
optics have been added when compared to the |
|
|
7727
|
Mon Nov 19 20:17:53 2012 |
Jenne | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : ETMX layout on new table |
For convenience, I would include
a steering mirror in front of the TRX PD. |
|
|
7728
|
Mon Nov 19 22:42:14 2012 |
Koji | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : ETMX layout on new table |
I don't like the idea to
place the cylindrical lenses right in front
of the laser. |
|
|
7813
|
Wed Dec 12 11:04:45 2012 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : ETMX layout on new table | I have updated the layout to fix all the
issues brought up. The last couple of 2"
green steering mirrors will hold the PZTs |
|
|
7815
|
Wed Dec 12 14:59:49 2012 |
Manasa | Configuration | 40m Upgrading | New tip-tilts layout in BSC | I have updated the BSC layout to include
the new tip-tilts. The bigger footprints
of the tiptilts are on in |
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|
7889
|
Thu Jan 10 12:41:06 2013 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : wiki page |
I have created a wiki page linked here with |
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