| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14278
|
Tue Nov 6 19:41:46 2018 |
Jon | Omnistructure | | c1vac1/2 replacement | This afternoon I started setting up the
Supermicro 5017A-EP that will replace c1vac1/2.
Following Johannes's procedure in |
|
|
14282
|
Wed Nov 7 19:17:18 2018 |
Jon | Omnistructure | | modbusIOC is running on c1vac replacement | Today I finished setting up the server
that will replace the c1vac1/2 machines.
I put it on the martian network at the unassigned |
|
|
14287
|
Fri Nov 9 22:24:22 2018 |
Jon | Omnistructure | | Wiring of Vacuum Acromag Chassis Complete | Wiring of the power, Ethernet, and indicator
lights for the vacuum Acromag chassis is
complete. Even though this crate will only |
|
|
14296
|
Wed Nov 14 21:34:44 2018 |
Jon | Omnistructure | | Vacuum Acromags installed and tested | All 7 Acromag units are now installed in
the vacuum chassis. They are connected to
24V DC power and Ethernet. |
|
|
14308
|
Mon Nov 19 22:45:23 2018 |
Jon | Omnistructure | | Vacuum System Subnetwork | I've set up a closed subnetwork for
interfacing the vacuum hardware (Acromags
and serial devices) with the new controls |
|
|
14309
|
Mon Nov 19 23:38:41 2018 |
Jon | Omnistructure | | Vacuum Acromag Channel Assignments | I've completed bench testing of all
seven vacuum Acromags installed in a custom
rackmount chassis. The system contains |
|
|
14315
|
Sun Nov 25 17:41:43 2018 |
Jon | Omnistructure | | Vacuum Controls Upgrade - Status and Plans | New hardware has been installed in the
vacuum controls rack. It is shown in the
below post-install photo. |
|
|
14320
|
Mon Nov 26 21:58:08 2018 |
Jon | Omnistructure | | Serial Vacuum Signals | All the serial vacuum signals are now interfaced
to the new digital controls system. A set
of persistent Python scripts will query each |
|
|
14420
|
Tue Jan 29 16:12:21 2019 |
Chub | Update | | | The foam in the cable tray wall passage
had been falling on the floor in little bite-sized
pieces, so I investigated and found a fiber |
|
|
14435
|
Tue Feb 5 10:22:03 2019 |
chub | Update | | oil added to RP-1 & 3 | I added lubricating oil to roughing pumps
RP1 and RP3 yesterday and this morning.
Also, I found a nearly full 5 gallon jug |
|
|
14437
|
Wed Feb 6 10:07:23 2019 |
Chub | Update | | pre-construction inspection | The Central Plant building will be undergoing
seismic upgrades in the near future.
The adjoining north wall along the Y arm |
|
|
14476
|
Fri Mar 8 08:40:26 2019 |
Anjali | Configuration | | Frequency stabilization of 1 micron source | The schematic of the homodyne configuration
is shown below.
Following are the list of components |
|
|
14621
|
Sat May 18 12:19:36 2019 |
Kruthi | Update | | CCD calibration and telescope design | I went through all the elog entries related
to CCD calibration. I was wondering
if we can use Spectralon diffuse |
6x |
|
14626
|
Mon May 20 21:45:20 2019 |
Milind | Update | | Traditional cv for beam spot motion | Went through all of Pooja's elog posts,
her report and am currently cleaning up her
code and working on setting up the simulations |
|
|
14782
|
Fri Jul 19 22:48:08 2019 |
Kruthi | Update | | Dataviewer error | I'm not able to get trends of
the TM adjustment test that Rana had
asked us to perform, from the dataviewer. |
|
|
14783
|
Sat Jul 20 01:03:37 2019 |
gautam | Update | | Dataviewer error | What channels are you trying to read?
|
|
|
14869
|
Tue Sep 10 16:10:40 2019 |
Chub | Update | | Rack Update | Still removing old cable, terminal blocks
and hardware. Once new strain reliefs
and cable guides are in place, I will need |
|
|
15225
|
Wed Feb 26 17:17:17 2020 |
Yehonathan | Update | | Arms DC loss measurements | {Yehonathan, Gautam}
In order to measure the loss in
the arm cavities in reflection, we use the |
6x |
|
15729
|
Thu Dec 10 17:12:43 2020 |
Jon | Update | | New SMA cables on order | As requested, I placed an order for an
assortment of new RF cables: SMA male-male,
RG405. |
|
|
15739
|
Sat Dec 19 00:25:20 2020 |
Jon | Update | | New SMA cables on order | I re-ordered the below cables, this
time going with flexible, double-shielded
RG316-DS. |
|
|
15740
|
Sat Dec 19 02:42:56 2020 |
Koji | Update | | New SMA cables on order | Our favorite (flexible) RF cable is Belden's
1671J (Jacketed solder-soaked coax cable).
It is compatible RG405. I'm not sure |
|
|
16308
|
Thu Sep 2 19:28:02 2021 |
Koji | Update | | This week's FB1 GPS Timing Issue Solved | After the disk system trouble, we could
not make the RTS running at the nominal state.
A part of the troubleshoot FB1 was rebooted. |
|
|
16339
|
Thu Sep 16 14:08:14 2021 |
Ian MacMillan | Frogs | | Tour | I gave some of the data analysts a look
around because they asked and nothing was
currently going on in the 40m. Nothing was |
|
|
17418
|
Wed Jan 25 10:02:47 2023 |
yehonathan | Update | | Earthquake, MC3 watchdog tripped | We came this morning and noticed the FSS_FAST
channel was moving very rapidly. Short inspection
showed that MC3 watchdog got tripped. After |
|
|
17595
|
Fri May 19 09:23:58 2023 |
Paco | Update | | MCF Noise | The fan behind the
PSL controller is injecting excess band limited |
|
|
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 |
|
2657
|
Thu Mar 4 22:07:21 2010 |
rana | Update | 40m Upgrading | 11MHz PD not yet designed | Use 10 Ohms for the resistance - I have
never seen a diode with 25 Ohms.
p.s. PDFs can be joined together |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
|
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 |
|
|
2785
|
Fri Apr 9 06:45:28 2010 |
Alberto | Update | 40m Upgrading | REFL11 Noise Vs Photocurrent |
|
|
|
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 |
|
|
|
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 ) |
|
|
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 |
|
|
|
2894
|
Fri May 7 11:21:49 2010 |
koji | Update | 40m Upgrading | New improved design for the 11MHz photodiode | How much is the width?
|
|
|
2896
|
Fri May 7 18:18:02 2010 |
Alberto | Update | 40m Upgrading | New improved design for the 11MHz photodiode |
|
|
|
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: |
|
|
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 |
|