| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1
|
Thu Nov 5 07:07:40 2009 |
rana | Misc | RC noise | Frank's pictures in other log | http://nodus.ligo.caltech.edu:8080/AdhikariLab/423 |
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2
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Sun Nov 8 14:35:25 2009 |
Frank | Laser | RefCav | resonance frequencies | i checked the resonant frequency of both
cavities in order to see if we can lock both
using the existing frequency actuator (AOM) |
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3
|
Sun Nov 8 14:38:56 2009 |
Frank | Laser | DAQ | channels for the temperature scan | the channels used for the refcav temp scan
are:
C:PSL-PMC_PMCTRANSPD |
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4
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Mon Nov 9 02:19:45 2009 |
rana | Laser | RefCav | resonance frequencies | I don't know if its worth the trouble,
but we do have a ~200 MHz AOM. Sam Waldman
had us buy one of these for doing the OMC |
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5
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Mon Nov 9 18:49:15 2009 |
Frank | Laser | RefCav | resonance frequencies |
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6
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Thu Nov 12 17:39:49 2009 |
Frank | Electronics | VCO | tuning range | tuning range of the 80MHz VCO used for
the frequency stabilization:
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7
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Thu Nov 12 17:45:02 2009 |
Frank | Laser | RefCav | laser crzstal temp settings for both cavities | currently the setting for the NPRO temp
slider is:
refcav 1: 0.7341
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8
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Thu Nov 12 18:01:10 2009 |
Frank | Things to Buy | RefCav | heaters for the other two chambers | in order
to improve the stability of the chamber temperature
the current plan is to add a heater and insulation |
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9
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Thu Nov 12 20:56:38 2009 |
rana | Things to Buy | RefCav | heaters for the other two chambers | I think its important to think of a good
solution, since we may want to retrofit some
other chambers. |
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10
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Fri Nov 13 10:56:32 2009 |
Frank | Things to Buy | RefCav | heaters for the other two chambers |
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11
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Fri Nov 13 11:12:38 2009 |
Frank | Laser | RefCav | temp settings for both cavities | current settings for the slow actuator
to bring the cavities on resonance are:
refcav 1 : 0.6836V
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12
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Fri Nov 13 12:46:35 2009 |
rana | Misc | RefCav | heaters for the other two chambers | For the heater, my main concern is on the
residual thermal gradients after stabilization.
The Alnis, Hansch, et al papers described |
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13
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Tue Nov 17 12:01:54 2009 |
Frank | Misc | RefCav | heaters for the other two chambers |
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14
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Wed Nov 18 20:45:52 2009 |
Frank | Misc | RefCav | leaking vaccum valve | after
getting the o-ring from the drever lab for
the adapter to the turbo pump to pump the |
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15
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Wed Nov 18 20:52:39 2009 |
Frank | Laser | Laser | laser error | this morning the laser was off with the
error "HT error". As the chiller
was off too i think that means high temperature |
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16
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Thu Nov 19 16:06:30 2009 |
Alberto | Computing | Computers | Elog debugging output - Down time programmed today to make changes | We want the elog process to run in verbose
mode so that we can see what's going. The
idea is to track the events that trigger |
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17
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Thu Nov 19 18:50:33 2009 |
Alberto | Computing | Computers | Elog debugging output - Down time programmed today to make changes |
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18
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Sat Nov 21 17:27:32 2009 |
Frank | Misc | RefCav | old Minco heaters | found
four old Minco heaters (model HR5494-106)
(from 1995) . This type with 106 Ohms |
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19
|
Mon Nov 23 17:05:51 2009 |
Frank | Laser | RefCav | heater and insulation added | added
the four Minco heaters and a first layer
of 1" thick foam insulation to the second |
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20
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Tue Nov 24 11:07:30 2009 |
Frank | Laser | RefCav | slow actuator settings | slow actuator settings for being resonant:
update
@1pm: |
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21
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Mon Nov 30 15:01:40 2009 |
Frank | Electronics | VCO | VCO tuning | measured frequency tuning vs wideband input
of VCO for calibration of measured spectra.
graph coming soon... |
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22
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Sun Dec 6 13:20:52 2009 |
Frank | Electronics | VCO | VCO tuning |
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23
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Sun Dec 6 14:54:43 2009 |
Frank | Laser | RefCav | temp sensor added on refcav2 | added
a single temp sensor on refcav2 (AD590) last
week in order to monitor the temp of |
|
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24
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Fri Dec 11 19:45:15 2009 |
Frank | Laser | RefCav | LHO RefCav available | there
is a full LIGO RefCav available here at LHO.
They don"t use it anymore and its just |
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25
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Thu Dec 17 13:55:07 2009 |
Frank | Computing | DAQ | Baja4700 jumper settings and setup | in order to get the baja4700 cpu
work the jumpers have to be like this
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26
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Thu Dec 17 16:57:10 2009 |
Frank | Computing | DAQ | new analyzer cavity DAQ system | we set up a second, independent DAQ system
for the analyzer cavity. It has one 16bit
D/A card, 16bit A/D card and 12bit A/D card. |
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27
|
Thu Dec 17 18:13:01 2009 |
Frank | Electronics | RefCav | power supply remote programming | pictures taken from the existing power
supply.
. |
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28
|
Fri Dec 18 13:13:12 2009 |
Frank | Computing | DAQ | channels for new VME-based DAQ system now available in fb1 | the new channels are available as C3:PSL-GENxxxx
on fb1. We have three cards installed so
far: |
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29
|
Tue Dec 22 00:47:40 2009 |
Frank | Laser | RefCav | cavity temp stabilization | we repaired the sensors on the first refcav
and renamed and added channels to the
DAQ. The channels are now: |
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30
|
Tue Dec 22 16:15:03 2009 |
Frank | Laser | RefCav | FSS settings | settings for the FSS:
common gain : 1dB
fast gain : 15dB |
|
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31
|
Mon Dec 28 17:01:43 2009 |
Frank | Laser | RefCav | thermal insulation end caps added | we added two endcaps for the first refcav
and additional insulation for the ion pump
and valve. |
|
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32
|
Tue Dec 29 19:21:11 2009 |
Frank | Laser | RefCav | temperature stability | here a plot of the temperatute stability
in peter's lab (upper graph) if nobody is
working in the lab (christmas) and if someone |
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33
|
Fri Jan 15 11:35:17 2010 |
Frank | Laser | RefCav | refcav update | the last
couple of days we fixed a couple of thinks:
We |
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34
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Fri Jan 15 12:28:54 2010 |
Frank | Laser | RefCav | foam cutting machine | in order
to build a custom fit insulation for the
cavities i've built some hot wire foam cutting |
12x |
|
35
|
Fri Jan 15 12:53:31 2010 |
Frank | Laser | RefCav | latest slow actuator values | refcav: 0.9512 @ 70.02 degC
acav: 0.9252 @ 39.996 degC
with 0.858V/GHz -> |
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36
|
Fri Jan 15 20:19:54 2010 |
Frank | Laser | RefCav | both cavities locked | after some trouble with fluctuating temperatures
and a brocken cable to the vco i could finally
lock both cavities. So now we can take first |
|
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37
|
Sun Jan 24 18:35:47 2010 |
Frank | Laser | RefCav | new slow actuator values | - more insulation to the refcav chamber
added
actual slow actuator values for both |
|
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38
|
Tue Jan 26 03:38:10 2010 |
rana | Laser | RefCav | frequency findings | I guess if you have a frequency counter
with a GPIB interface or a simple flip-flop
XOR based phase/frequency discriminator, |
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39
|
Wed Jan 27 11:25:33 2010 |
Frank | Laser | RefCav | frequency findings |
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40
|
Thu Jan 28 16:07:29 2010 |
Frank | Computing | DAQ | psl channels moved to C3 + new channels | here is a list of all channels of the psl
subsystem. We changed the generic channel
names to final names now. |
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41
|
Mon Feb 1 12:51:43 2010 |
Rana, Frank | DailyProgress | NoiseBudget | First Refcav noise measurement | Attached is the relative frequency noise between
the 2 reference cavities downstairs.
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42
|
Tue Feb 2 16:36:46 2010 |
Frank | Electronics | DAQ | DAQ pinouts | 3123-card (16bit input), 25pin d-sub connector
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43
|
Tue Feb 2 18:22:38 2010 |
Frank | Electronics | DAQ | QPD channels | QPD channels for RefCav beam pointing measurements:
C3:PSL-RCAV_QPDX : X
C3:PSL-RCAV_QPDY : Y |
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44
|
Wed Feb 3 13:05:26 2010 |
Frank | Laser | RefCav | beam pointing @ refvac | measured the beam pointing caused by driving
the AOM frequency modulation input. data
is uncalibrated so far, just a screenshot |
|
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45
|
Wed Feb 3 16:19:52 2010 |
Tara Chalermsongsak | Laser | RefCav | frequency findings |
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46
|
Wed Feb 3 18:58:50 2010 |
Tara | Laser | RefCav | frequency findings | When the VCO is modulated by a triangular
function +/- 6V, a small fluctuation is observed
in transmitted and reflected beam. There |
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47
|
Wed Feb 3 23:41:11 2010 |
Frank | Laser | RefCav | TF of ACAV (VCO+cavity+pd+mixer) | measured tf of the analyzer cavity including
VCO (wideband input, around 80MHz center
frequency), double-passed AOM, cavity, pd |
|
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48
|
Thu Feb 4 20:13:53 2010 |
Frank | Laser | Laser | output coupler to acav changed | exchanged the old mirror (T330-HR, T331-AR)
by a simple Y1-1025-45P to get more power.
measured laser power : 7.17W |
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49
|
Thu Feb 4 22:01:27 2010 |
Frank | Laser | RefCav | acav re-aligned | acav is now re-aligned. As Tara stopped
aligning the AOM i will use the NPRO pzt
to lock it (instead of the VCO). Then i will |
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|
50
|
Fri Feb 5 05:13:09 2010 |
Peter, Frank | Laser | RefCav | everything back online | we spent the whole night to re-align everything.
By now everything is back online, both cavities
were locked.for a short time. We still have |
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