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ID Date Author Type Category Subject Text Attachments
  1359   Thu Oct 3 10:34:32 2013 taraNotesopticcoating optimization for AlGaAs:error analysis The new optimization is less sensitive
to the values of refractive indices, but
the overall error will not change much if
  1358   Wed Oct 2 16:21:11 2013 ChloeDailyProgressECDLTEC Construction Today Tara showed me where to find
isopropanol in order to clean the Peltier
element. After cleaning it carefully, the
  1357   Mon Sep 30 15:45:09 2013 ChloeDailyProgressECDLTEC Construction Today I tried to calibrate the PID
gain for the TEC controller. I noticed some
connections needed repairing to I resoldered
  1356   Thu Sep 26 23:25:40 2013 taraNotesopticcoating optimization for AlGaAs:error analysis I'm trying to find another optimization
that is less sensitive to change in nH and
nL. Here is a few thought and a few examples.
  1355   Wed Sep 25 12:23:25 2013 EvanDailyProgressRefCavCCD camera for monitoring refl beamOK, I borrowed a Watec from the ATF. It
is more sensitive than the jWin I was using,
but judging by the graininess we appear to
  1354   Wed Sep 25 10:15:49 2013 ranaDailyProgressRefCavCCD camera for monitoring refl beam 
 No (as I already told Tara).
The PD reflection is distorted and
  1353   Tue Sep 24 20:28:47 2013 EvanDailyProgressRefCavCCD camera for monitoring refl beamI placed a CCD camera behind the steering
mirror directly before the south RFPD in
the hopes of getting a handle on the shape
  1352   Tue Sep 24 11:12:49 2013 EvanDailyProgressISSNorth EOAM: broken?Last week I talked to an engineer at Newport,
and he agreed that the discrepancy (1 µW/V
versus 30 µW/V) seemed unusual. Tara
  1351   Mon Sep 23 18:50:05 2013 taraNotesopticcoating optimization for AlGaAs:error analysis

  1350   Mon Sep 23 18:07:22 2013 ranaNotesopticcoating optimization for AlGaAs:error analysis 
If that's true, then it means that
a 1% deviation in the index of refraction
  1349   Mon Sep 23 11:57:13 2013 EvanDailyProgressRFSouth PDH loop phase adjustmentI removed 29 cm of SMA cable between the
south RFPD RF output and the south TTFSS
PD input in order to make the PDH error signal
  1348   Sun Sep 22 00:27:09 2013 some random goonNotesopticcoating optimization for AlGaAs:error analysis 
 The numbers in the table are
the ratio between the TO noise when the parameter
  1347   Sat Sep 21 23:49:29 2013 ranaNotesopticcoating optimization for AlGaAs:error analysis I don't understand these values for
  1346   Fri Sep 20 21:19:29 2013 Matt A.Notesopticcoating optimization for AlGaAs:error analysisIn our meeting, Eric mentioned
that there might be some uncertainty in how
the average coating properties are calculated.
  1345   Fri Sep 20 19:26:45 2013 taraNotesopticcoating optimization for AlGaAs:error analysisI'm using Matt's code to do error analysis
for AlGaAs coatings. This time I vary materials'
parameters and compare the thermo optic noise,
  1344   Thu Sep 19 20:38:17 2013 taraNotesopticcoating optimization for AlGaAs:error analysisDetails for AlGaAs coatings order

structure can be found in 
  1343   Thu Sep 19 18:09:18 2013 taraSummaryNoiseBudgetCoating Thermal Noise Calculator


  1342   Thu Sep 19 14:55:11 2013 taraSummaryNoiseBudgetCoating Thermal Noise Calculator


  1341   Thu Sep 19 10:42:59 2013 EvanDailyProgressElectronics EquipmentPDH loop noiseYesterday I measured the noise of the refcav
PDH loops. Because of RFAM effects, possible
nonlinearity in the RFPD response, etc.,
  1340   Wed Sep 18 21:55:11 2013 taraNotesopticcoating optimization for AlGaAs:error analysis 
Optimized coatings structure.
  1339   Wed Sep 18 18:19:52 2013 EvanDailyProgressRFMeasurement of PDH modulation depthsI took measurements of the carrier and
sideband power transmitted through each cavity
in order to get the modulation depth Γ
  1338   Tue Sep 17 19:43:45 2013 taraSummaryNoiseBudgetCoating Thermal Noise Calculator


  1337   Fri Sep 13 13:40:43 2013 ranaSummaryNoiseBudgetCoating Thermal Noise Calculator combined PDFs with pdftk:
pdftk *.pdf cat output MattThermal.pdf
and saved as PDF-X for thumbnail
  1336   Thu Sep 12 18:12:26 2013 Matt A.SummaryNoiseBudgetCoating Thermal Noise CalculatorAs part
of checking Tara's code for optimizing the
coating structure  to reduce thermo-optic
  1335   Thu Sep 12 11:04:17 2013 EvanDailyProgressISSNorth EOAM: broken?Neither Tara nor I can get the north New
Focus 4104 to put out a significant amount
of power modulation, despite going  through
  1334   Wed Sep 11 18:29:40 2013 EvanDailyProgressEnvironmentExtreme Makeover: CTN Edition[Tara, Evan]
In preparation for tomorrow's sprinkler
installation, we have removed any extraneous
  1333   Wed Sep 11 00:07:04 2013 EvanDailyProgressISSBeefier ISS loop


  1332   Tue Sep 10 04:53:34 2013 taraDailyProgressNoiseBudgetRIN induced TO noise in beatThe cause of the peaks around 1kHz in RIN
is solved, PMC is the reason. After damping
it, the peaks disappears.
  1331   Mon Sep 9 21:19:24 2013 taraDailyProgressNoiseBudgetRIN induced TO noise in beatI'm trying to understand the measured RIN
in the setup. The evidence suggests that
the measured RIN in 100Hz- 6kHz, is real
  1330   Mon Sep 9 15:00:19 2013 EvanDailyProgressISSBeefier ISS loopI made a quick inverting op-amp integrator
which kicks in at 860 Hz at has gain 10 at
infinity. The feedback is a 5.6 kΩ
  1329   Mon Sep 9 02:27:46 2013 taraDailyProgressNoiseBudgetRIN induced TO noise in beatThe measured RIN is measured and converted
to frequency noise via photo thermal effect
then compared to beat. The effect seems to
  1328   Sat Sep 7 12:38:49 2013 EvanDailyProgressISSSimple ISS with SR560 - frequency noise couplingI've taken the above RIN data and combined
it with the intensity-to-frequency TF in
  1327   Sat Sep 7 04:29:32 2013 taraDailyProgressNoiseBudgetbeatShort note from tonight measurement:
1) scattered bump from dc to 100Hz
is mostly from seismic. It is worse during
  1326   Thu Sep 5 10:52:27 2013 EvanDailyProgressISSSimple ISS with SR560At Tara's suggestion, I implemented a simple
ISS by feeding the output of the PDA10CS
into an SR560 (ac-coupled) with some  gain,
  1325   Thu Sep 5 08:05:35 2013 EvanDailyProgressISSSouth EOAM calibration for 0.78 mW of output powerI used the black voltage calibrator to
give the south EOAM a DC voltage, and then
used the ThorLabs power meter to read off
  1324   Wed Sep 4 18:40:00 2013 ranaDailyProgressNoiseBudgetSeismic Noise Coupling


  1323   Tue Sep 3 09:52:17 2013 ranaDailyProgressNoiseBudgetSeismic Noise Coupling Can you please explain how the seismic
noise coupling is estimated for the noise
  1322   Mon Sep 2 18:31:46 2013 taraNotesopticcoating optimization for AlGaAs:error analysisCoating optimization and error analysis
are updated, see PSL:1320.
  1321   Mon Sep 2 03:38:27 2013 taraDailyProgressNoiseBudgetbeatIt's a quiet night, so I went down the
lab to measure the beat signal. We are getting
close. I think I have to review my noise
  1320   Sun Sep 1 18:38:37 2013 taraNotesopticcoating optimization for AlGaAs:error analysisI updated the optimization and error analysis.
The error in optimized structure is comparable
to that of a standard quarter wave length
  1319   Thu Aug 29 13:25:49 2013 taraDailyProgressVacuumpumping down the chamberThe turbo pump is removed, and the ion
pump is on. The initial value is ~7mA.
I removed the turbo pump and turn
  1318   Wed Aug 28 21:21:38 2013 taraNotesopticGWINC for TO calculation: recapHere is a summary for how I verify the
codes for TO calculation.
So far, we have been using a set
  1317   Wed Aug 28 20:19:44 2013 taraNotesEOMEOM driver: modificationWe modified the EOM driver, so that the
resonant frequency is now~ 14.75MHz. The
full test will be done later.
  1316   Wed Aug 28 11:13:07 2013 EvanDailyProgressBEATIntensity-to-frequency transfer function[Tara, Evan]
Last week we tried measuring a transfer
function which takes intensity fluctuation
  1315   Tue Aug 27 16:11:26 2013 taraNotesopticcoating optimization for AlGaAs:error analysisSince the optimized layer structure is
designed, I'm checking how the coatings properties
change with error in layer thickness.
  1314   Tue Aug 27 15:45:28 2013 EvanDailyProgressSeismicResonances of the seismic isolation stack[Tara, Koji, Evan]
On Friday when the vacuum chamber
was open, we took some impulse response measurements
  1313   Sat Aug 24 15:42:54 2013 taraDailyProgressVacuumpumping down the chamberI closed the chamber. The turbo pump is
on and pumping down.
 I realigned the beams so the
  1312   Fri Aug 23 19:00:13 2013 EvanDailyProgressRefCavNo more reflection overlap [Tara, Evan]
Tara and I opened the CTN vacuum
can this afternoon. Previously, the reflection
  1311   Thu Aug 22 20:31:28 2013 taraDailyProgressNoiseBudgetinstalled EOAMThe bump at 2kHz in the beat signal that
I saw before was also from RFAM. By adjusting
the 1/2 waveplate in front of the sideband
  1310   Thu Aug 22 13:36:19 2013 taraDailyProgressNoiseBudgetTransfer Functions (RIN to Frequency noise via photothermal) I went through all the code with
Evan and found another mistake. This time
the code should be correct, and the result
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