ID |
Date |
Author |
Type |
Category |
Subject |
2957
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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.
These legs had been used as oplev's mounts many years ago, but now they are served for 40m upgrading. These are really nice.
By putting them on the side of the end table, a mirror mounted on the top of the leg can reflect the beam outside of the end table.
Once we pick off the green beam from the end table to its outside, the green beam can propagate through the 40m walkway along the Y-arm.
So that we can measure the beam profile as it propagates.
These legs are also going to be used during mode matching of the vacuum optics. |
Attachment 1: leg1_small.png
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Attachment 2: leg2_small.png
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4727
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Mon May 16 15:46:05 2011 |
Koji | Update | General | optical layout viewable on the online version of autocad |
I have made my own AutoCAD WS account and put the latest 40m layout.
AutoCAD WS is a free cloud service which enable us to browse/edit the DWG files.
You can view/play/print it from the following link even without making the account.
https://www.autocadws.com/main/publish?link=RVFmNEtOd3EzNVFtRXcx
If you make your account you can actually save it although the editing capability is somewhat limited.
Notes:
- It needs the Flash plug-in and Internet connection.
- I think Safari is the most stable platform on Mac. (i.e. I had some malfunctions with Firefox and Chrome) |
1020
|
Thu Oct 2 16:44:28 2008 |
steve | Summary | oplevs | optical levers |
The idea is to push the UGF to 10 Hz of the TM oplev servos with quiet HeNe laser.
We measured good intensity noise of JDS 1103P in May 2007 and converted most of the TM oplevs to it.
The ITMs still have the noisy 670nm , 1 mW, diode lasers to begin with.
In order to get 1 mW power returning to the qpds I measured the power going to TMs
and returning on qpds ...so we can select the appropriate laser power for the conversion.
40m optical lever lasers:
HeNe laser JDS 1103P, 633nm, linear polarization 500:1,
ETMX: qpd 0.12 mw (4%) reflected of 3 mW,
ETMY: qpd 0.1o (3.8%) " 2.6
BS: qpd 0.02 ( 2.5%) " 0.8
PRM: qpd 0.01 (1.3%) " 0.75
SRM: qpd 0.08 (10%) " 0.8
Coherent 670 nm Diode Lasers VLM-tm, 0.95 mW, linear polarization 100:1,
ITMX: qpd 0.1 mW (11%) reflected back from TM of 0.9 mW
ITMY: qpd 0.04 (7%) " " 0.6
It seems that JDS HeNe laser 633 nm, linear polarization 500:1, 10 mW will do the job |
1377
|
Mon Mar 9 17:11:38 2009 |
Alberto | Configuration | oplevs | optical levers centering |
Yoichi, Alberto
this afternoon we centered the optical levers for all the optics.
To do that we first ran the alignment scripts for all the cavities. |
9156
|
Tue Sep 24 20:43:45 2013 |
masayuki | Summary | SUS | optical levers centering |
I centered optical levers of ITMX,BS,ETMY. I also change the position of optical levers of ITMX, ETMY, ITMY, BS on Friday night(9/21), of ITMX, ETMY, BS on Monday night. Both are around 6:00 ~ 7:00.But centering on Monday was totally wrong, because I centered with not good IFO alignment.
The attachment is the 5 days trend of the opt lev of ITMX. First gap is alignment on Friday and Second gap is the alignment on Monday. Now I centered after locking the FPMI.
The attachment 2 is the last 6 hours data. The gap on 9/25 00:00 and 1:30(UTC) is because the alignment of the cavity and the last gap is because of centering of the optical lever. |
Attachment 1: Screenshot-Untitled_Window.png
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Attachment 2: Screenshot-Untitled_Window-1.png
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7106
|
Tue Aug 7 16:11:23 2012 |
steve | Update | SUS | optical table box wall proposal |
Sanwiched wall as shown: 1" clear acrylic, 2 layers of 0.004" thick "window tint", 1 layer of 0.007" thermashield and 0.125" yellow acrylic
Visibility: 70 %, Transmission of 1064 nm 2-3 % at 0-50 degrees incident power density 0.7 W/mm2
Max power 100 mW
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Attachment 1: IMG_1479.JPG
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Attachment 2: IMG_1478.JPG
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7107
|
Tue Aug 7 16:21:16 2012 |
rana | Update | SUS | optical table box wall proposal |
Quote: |
Sanwiched wall as shown: 1" clear acrylic, 2 layers of 0.004" thick "window tint", 1 layer of 0.007" thermashield and 0.125" yellow acrylic
Visibility: 70 %, Transmission of 1064 nm 2-3 % at 0-50 degrees incident power density 0.7 W/mm2
Max power 100 mW
|
Good. The power density and max power are not important (especially since you don't define a quantitative way to spec them). We ONLY care about the transmission. |
4701
|
Thu May 12 09:00:23 2011 |
steve | Update | General | optical table covers must be used |
I found ITMX-ISCT and BS-ISCT ( IFO sensing-control table) not covered this morning. Please do not leave tables open. |
9941
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Mon May 12 14:42:25 2014 |
steve | Update | endtable upgrade | optical table enclosure wall proposal and table at ETMY |
Quote: |
Sanwiched wall as shown: 1" clear acrylic, 2 layers of 0.004" thick "window tint", 1 layer of 0.007" thermashield and 0.125" yellow acrylic
Visibility: 70 %, Transmission of 1064 nm 2-3 % at 0-50 degrees incident, power density ~ 0.7 W/mm2
Max power 100 mW
|
More details about this east end " acrylic + " enclosure ( optical table cover ) can be found elog entry 6210, 7194 and 7106
Window tinted layer transmission plot is below.
We have a film which may meet your requirements and the values are shown below:
Wavelength (nm) Transmission Reflectance(front) Reflectance (back)
1060 .0772 .604 .759
1070 .0723 .615 .772
These values are taken from the LBNL Optics 6 program and if you have access to that program, the NFRC ID for the film is 202. If you do not have access to the program, I have a captured the graph which may be of some help. I apologize for the appearance of the graph but someone at LBNL decided it would look better with a dark gray background – the yellow is the transmission curve, the blue is the reflectance (front) and the green is the reflectance (back).

The film is referred to as “Hilite 70” and has a 72% visible light transmission. These results were obtained with the film mounted on 1/8” clear glass.
I
Saint-Gobain Performance Plastics
www.solargard.com
Please consider your environmental responsibility before printing this email.
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Attachment 1: Hilite70.jpg
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Attachment 2: ETMY-ISCT.jpg
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Attachment 3: RoscoThermashield.pdf
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10071
|
Thu Jun 19 14:12:45 2014 |
steve | Update | safety | optical table scans |
PSL, AP, ETMY and ETMX optical tables were scanned for stay beam. |
6139
|
Tue Dec 20 15:49:21 2011 |
steve | Update | PEM | optical table top |
3/4 " thick colored acrylic material will be used in this air tight design. Surgical tubing for o-ring. We may have to put an o-ring into the bottom to have it really air tight.
Feedtrouhs: www.roxtec.com
The top drawing is not ready. It will have handle and industrial grade L-handle lock pin to hold cover down. There will be 2 one inch od post in the midle of the table to hold the cover and lock the ball pin.
I'm waiting for your inputs, so I can send this preliminary design out for quote.
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Attachment 1: 05150901.PDF
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6190
|
Thu Jan 12 10:11:59 2012 |
steve | Update | PEM | optical table top with 1" wall |
Quote: |
3/4 " thick colored acrylic material will be used in this air tight design. Surgical tubing for o-ring. We may have to put an o-ring into the bottom to have it really air tight.
Feedtrouhs: www.roxtec.com
The top drawing is not ready. It will have handle and industrial grade L-handle lock pin to hold cover down. There will be 2 one inch od post in the midle of the table to hold the cover and lock the ball pin.
I'm waiting for your inputs, so I can send this preliminary design out for quote.
|
The present plan to go with clear cast acrylic plexiglass 1" thick side wall and two clear 1/2 thick top cover.
The inside would be lined with light braun YAG safety window sheets 0.14" VLT ~25% OD 4 @ 532nm & OD 5 @ 1064nm
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Attachment 1: 101122012atc.PDF
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5260
|
Thu Aug 18 00:58:40 2011 |
jamie | Update | SUS | optics kicked and left free swinging |
ALL optics (including MC) were kicked and left free swinging at:
997689421
The "opticshutdown" script was also run, which should turn the watchdogs back on in 5 hours (at 6am).
|
1071
|
Thu Oct 23 11:26:25 2008 |
steve | Bureaucracy | VAC | optosigma forks for vacuum |
Nine short forks from OptoSigma were cleaned, baked and measured by Bob T.
They passed the LIGO vac compatiblity test as Rana predicted.
Remember: Thorlab and Newfocus forks failed this qualification process. |
6856
|
Fri Jun 22 19:52:47 2012 |
Jamie | Update | Computers | ottavia reconfigured as CDS workstation |
ottavia has been reinstalled with Ubuntu 10.04 LTS, and has been configured as a CDS workstation.
I have been maintaining a script that takes a stock 10.04 install and configures it as a workstation. I've attached it here, but it lives at:
/users/controls/workstation-setup.sh
The script is designed to be idempotent, i.e. it can be run on a machine that has already been configured and it will either have no affect or update. |
Attachment 1: workstation-setup.sh
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#!/bin/bash
# This is a CDS workstation setup script for Ubuntu 10.04 It is
# idempotent, so running it on an already configured workstation is
# fine.
########################################
### controls
if [[ $(id -u controls) != 1001 ]] ; then
... 111 more lines ...
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2633
|
Tue Feb 23 16:20:44 2010 |
steve | Configuration | VAC | outgassing + leak |
Quote: |
As preparation for the upcoming planned power outage we turned turbos, RGA off and closed valves.
IFO chamber is not pumped now. Small leaks and out gassing will push the pressure up slowly. At 3 mTorr of P1 the PSL output shutter
will be closed by the interlock.
It is OK to use light in the IFO up to this point.
|
Our vacuum was not pumped for 4 days. The computers were not up when we started pumping again. The manual reading on P1 was 15 mTorr.
This means that our outgassing plus leakrate is ~3.8 mTorr /day
3-5 mTorr / day is normal |
Attachment 1: outgleak.jpg
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9028
|
Mon Aug 19 10:16:15 2013 |
Picasso | Metaphysics | Treasure | outsider art |
 |
14002
|
Fri Jun 22 00:06:13 2018 |
shruti | Update | General | over-head fluorescent lights down |
Two out of the four over-head fluorescent lights in the X end of the interferometer were flickering today. |
8431
|
Tue Apr 9 14:55:13 2013 |
Jamie | Update | CDS | overbooked test points cause of DAQ problems |
Folks were complaining that they were getting zeros whenever they tried to open fast channels in DTT or Dataviewer. It turned out that the problem was that all available test points were in use in the c1lsc model:

There is a limit to how many test points can be open to a single model (in point of fact I think the limit is on the data rate from the model to the frame builder, not the actual number of open test points). In any event, they was all used up. The grid at the bottom right of the C1LSC GDS screen was all full of non-zeros, and the FE TRATE number was red, indicating that the data rate from this model had surpassed threshold.
The result of this overbooking is that any new test points just get zeros. This is a pretty dumb failure mode (ideally one would not be able to request the TP at all with an appropriate error message), but it is what it is. This usually means that there are too many dtt/dataviewers left with open connections.
We tried killing all the open processes that we could find that might be holding open test points, but that didn't seem to clear them up. Stuck open test points is another known problem. Referencing the solution in #6968 I opened the diag shell and killed all test points everywhere:
controls@pianosa:~ 0$ diag -l -z
Set new test FFT
NDS version = 12
supported capabilities: testing testpoints awg
diag> tp clear * *
test point cleared
diag> quit
EXIT KERNEL
controls@pianosa:~ 0$
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14394
|
Thu Jan 10 10:23:46 2019 |
gautam | Update | VAC | overnight leak rate |
Overnight, the pressure increased from 247 uTorr to 264 uTorr over a period of 30000 seconds. Assuming an IFO volume of 33,000 liters, this corresponds to an average leak rate of ~20 uTorr L / s. It'd be interesting to see how this compares with the spec'd leak rates of the Viton O-ring seals and valves/ outgassing rates. The two channels in the screenshot are monitoring the same pressure from the same sensor, top pane is a digital readout while the bottom is a calibrated analog readout that is subsequently digitized into the CDS system.
Quote: |
We allowed the pumpdown to continue until reaching 9e-4 torr in the main volume. At this point we valved off the main volume, valved off TP2 and TP3, and then shut down all turbo pumps/dry pumps. We will continue pumping tomorrow under the supervision of an operator. If the system continues to perform problem-free, we will likely leave the turbos pumping on the main volume and annuli after tomorrow.
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Attachment 1: OvernightLeak.png
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14429
|
Sat Feb 2 21:53:24 2019 |
Koji | Update | VAC | overnight leak rate |
The pressure of the main volume increased from ~1mtorr to 50mtorr for the past 24 hours (86ksec). This rate is about x1000 of the reported number on Jan 10. Do we suspect vacuum leak?
Quote: |
Overnight, the pressure increased from 247 uTorr to 264 uTorr over a period of 30000 seconds. Assuming an IFO volume of 33,000 liters, this corresponds to an average leak rate of ~20 uTorr L / s.
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Attachment 1: Screen_Shot_2019-02-02_at_21.49.33.png
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14430
|
Sun Feb 3 15:15:21 2019 |
gautam | Update | VAC | overnight leak rate |
I looked into this a bit today. Did a walkthrough of the lab, didn't hear any obvious hissing (makes sense, that presumably would signal a much larger leak rate).
Attachment #1: Data from the 30 ksec we had the main vol valved off on Jan 10, but from the gauges we have running right now (the CC gauges have not had their HV enabled yet so we don't have that readback).
Attachment #2: Data from ~150 ksec from Friday night till now.
Interpretation: The number quoted from Jan 10 is from the cold-cathode gauge (~20 utorr increase). In the same period, the Pirani gauge reports a increase of ~5 mtorr (=250x the number reported by the cold-cathode gauge). So which gauge do we trust in this regime more? Additionally, the rate at which the annuli pressures are increasing seem consistent between Jan 10 and now, at ~100 mtorr every 30 ksec.
I don't think this is conclusive, but at least the leak rates between Jan 10 and now don't seem that different for the annuli pressures. Moreover, for the Jan 10 pumpdown, we had the IFO at low pressure for several days over the chirstmas break, which presumably gave time for some outgassing which was cleaned up by the TPs on Jan 10, whereas for this current pumpdown, we don't have that luxury.
Do we want to do a systematic leak check before resuming the pumpdown on Monday? The main differences in vacuum I can think of are
- Two pieces of Kapton tape are now in the EY chamber.
- Possible resiudue from cleaning solvents in IY and EY chambers are still outgassing.
This entry by Steve says that the "expected" outgassing rate is 3-5 mtorr per day, which doesn't match either the current observation or that from Jan 10. |
Attachment 1: Jan10_data.png
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Attachment 2: Feb1_data.png
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14431
|
Sun Feb 3 20:52:34 2019 |
Koji | Update | VAC | overnight leak rate |
We can pump down (or vent) annuli. If this is the leak between the main volume and the annuli, we will be able to see the effect on the leak rate. If this is the leak of an outer o-ring, again pumping down (or venting) of the annuli should temporarily decrease (or increase) the leak rate..., I guess. If the leak rate is not dependent on the pressure of the annuli, we can conclude that it is internal outgassing. |
14795
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Mon Jul 22 07:21:13 2019 |
gautam | Update | CDS | painosa messed with |
Somebody changed the settings on painosa without elogging anything about it. Why does this keep happening? I thought the point of the elog was to communicate. I think there are sufficient number of problems in the lab without me having to manually reset the control room workstation settings every week. Please make an elog if you change something. |
12829
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Wed Feb 15 00:26:44 2017 |
Johannes | Update | DAQ | panels and pcbs |
I finished designing the PCBs for the VME crate back sides (see attached). The project files live on the DCC now at https://dcc.ligo.org/LIGO-D1700058. I ordered a prototype quantity (9) of the PCB printed and bought the corresponding connectors, all will arrive within the next two weeks. See also attached the front panels for the Acromag DAQ chassis and Lydia's RF amplifier unit (the lone +24V slot confuses me: I don't see a ground connector?). On the Acromag panel, six (3x2) of the DB37 connectors are reserved for VME hardware, two are reserve, and I filled the remaining space with general purpose BNC connectors for whatever comes up. |
Attachment 1: acromag_chassis_panel.pdf
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Attachment 2: vme_backplane_panel.pdf
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Attachment 3: rfAmp.pdf
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12830
|
Wed Feb 15 09:06:13 2017 |
ericq | Update | DAQ | panels and pcbs |
The amplifier unit should use the three pin dsub connectors (3w3?) that we use on many of the other units for DC power, and preferably go through the back panel. You can leave out the negative pin, since you just need +24 and ground. |
12832
|
Wed Feb 15 22:21:12 2017 |
Lydia | Update | DAQ | panels and pcbs |
This is already how it's hooked up. The hole on the from that says +24 V is for an indicator light.
Quote: |
The amplifier unit should use the three pin dsub connectors (3w3?) that we use on many of the other units for DC power, and preferably go through the back panel. You can leave out the negative pin, since you just need +24 and ground.
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16702
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Sat Mar 5 01:58:49 2022 |
Koji | Summary | CDS | paola rescue |
ETMY end ThinkPad "paola" could not reboot due to "Fan Error". It seems that it is the failure of the CPU fan. I really needed a functional laptop at the end for the electronics work, I decided to open the chassis. By removing the marked screws at the bottom lid, the keyboard was lifted. I found that the CPU fan was stuck because of accumulated dust. Once the fan was cleaned, the laptop starts up as before. |
Attachment 1: PXL_20220305_035255834.jpg
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Attachment 2: PXL_20220305_034649120.MP.jpg
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12498
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Fri Sep 16 14:15:28 2016 |
steve | Update | PEM | partical counts |
South end flow bench and both clean room assembly flow benches measured zero counts for 0.3 and 0.5 micron size particales.
The counting efficiency of 0.5 micron is 100%
location
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0.3 micron particles / cf min
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0.5 micron particles / cf min
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counter
MET
ONE
|
effect |
ITMY table |
35,000 |
3,000 |
#3 |
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ETMY table |
35,000 |
3,000 |
#3 |
|
ITMX table |
24,000 |
2,400 |
#3 |
PSL HEPA at 50V |
ITMX wall mounted |
- |
2,500 |
#1 |
|
ETMX work bench |
5,000 |
600 |
#3 |
flow bench on |
The PSL HEPA performance was measured at the center of the table with MET ONE #3
Voltage Variac |
particles /cf min |
particles /cf min |
particle size |
0.3 micron |
0.5 micron |
60 |
0 |
0 |
50 |
10 |
0 |
40 |
1,400 |
110 |
20 |
1,400 |
100 |
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Attachment 1: 80days.png
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7754
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Tue Nov 27 11:27:22 2012 |
Steve | Update | PEM | particle count is going up |
Jeff is still working on the filter banks. |
Attachment 1: 5yparticles.png
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Attachment 2: particle_6m_6m.png
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Attachment 3: 1y_particlec.png
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Attachment 4: 10y_particle_c.png
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1127
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Mon Nov 10 16:44:14 2008 |
steve | Update | PEM | particle counter at MC2 |
The particle counter was moved to MC2 table temporarily.
It is clamped to the table at the south west corner.
It is pumping for 20s and waiting for 2 minutes now. |
12895
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Mon Mar 20 17:12:08 2017 |
steve | Update | PEM | particle counter inside of PSL enclousure |
The logging script is multiplying by 100 instead of 10 !
Quote: |
The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.
The HEPA filter speed at the Variac was turned down to 20V from 40
This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.
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Attachment 1: enclousure_partical_count.png
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12908
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Mon Mar 27 15:36:27 2017 |
Steve | Update | PEM | particle counter inside of PSL enclousure |
Quote: |
The logging script is multiplying by 100 instead of 10 !
Quote: |
The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.
The HEPA filter speed at the Variac was turned down to 20V from 40
This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.
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Some one turned up the PSL HEPA rotation voltage from 20 V to 33 ( 120V Variac ) and X-arm AC set temp lowered to 68F
Effects at 12" height from optical table :
1.0, 0.5 & 0.3 micron particle count goes to zero and temperature fluctuaion increased
Rotation speed voltage was set to 30V
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Attachment 1: HEPA_flow_effects.png
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834
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Thu Aug 14 11:39:06 2008 |
steve | Update | PEM | particle counter is out of order |
The 40m ifo paricle counter sensor failed last night. |
12836
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Fri Feb 17 10:56:12 2017 |
steve | Update | PEM | particle counter moved into PSL enclousure |
The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.
The HEPA filter speed at the Variac was turned down to 20V from 40
This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.
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Attachment 1: from_here.jpg
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Attachment 2: to_here.jpg
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Attachment 3: PSL_particles.png
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3547
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Wed Sep 8 16:17:58 2010 |
steve | Update | PEM | particle counter problem |
I played with the particle counter this morning. Now it's running and reading the correct numbers on the old COCHECKLIST.adl medm screen.
However, it can not be seen with dataviewer.
Koji just rebooted the frame builder and the problem was solved. |
871
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Fri Aug 22 16:06:29 2008 |
steve | Update | PEM | particle counter replaced, flowbenches & HEPAs checked |
MetOne #2 counter was swapped in (on the top of IOC, facing SW direction, at ~75 deg upwards)
with channel one size 0.3 micron and channel two size 1.0 micron.
Sampling time was reduced from 60s to 6 sec at 0.1 cf/min at 25 min rate.
This means that displayed number needs to be multiplied by x100 to get particles/cf/min
HEPA filters and flow benches were checked:
PSL enclosure closed, HEPA speed at 60% 0-0 particles on optical table NW corner
AP covered optical table 1,000 particles of 0.3micron and 10 of 1.0 micron at NE corner
Flow bench at SE 0-0 particle (p)
on the top of SP cover at SE corner 60,000 p of 0.3 micron and 530 p of 1.0 micron
Mobile HEPAs 10cm from output screen in the center 800 p of 0.3 micron and 0 p of 1 micron
These filters will be replaced.
Clean assembly room:
both flow benches 0-0 p for 0.3-1.0 micron
east side bench 520 p of 0.3 micron and 210 p of 1.0 micron
Large hood in baking room with fan on 1.7 million p of 0.3 micron
and 16,000 p of 1.0 micron
Pasadena air just outside of main entrance:
3 million p of 0.3 micron and 30,000 p of 1.0 micron
My desk 743,000 p of 0.3micron, 63,000 p of 0.5 micron and 5,500 p of 1.0 micron cf/min
NOTE: existing COCHECKLIST.adl PEM displays needs to be corrected so it shows the 10 fold increase
and change particle size on this screen to 0.3 micron |
9180
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Tue Oct 1 10:06:27 2013 |
Steve | Update | PEM | particle counts |
How can we improve the cleanliness of the 40m IFO room 104 ? May be Mario Batali crocs if you chief chef of the lab likes it. We can do more effective things.
Atm 1 is showing the lab air quality dependence on outside air measured at the top of the IOO chamber. This made me to measure the differential pressure between lab and out side.
Properly sized air conditioner is over pressurizing it's room by 0.05 [" Water] like clean assembly room.
The 40m at Vertex location is barely getting pressurized to 0.01 " W
The control room is OK with 0.04 " W but it's air quality is very bad! It is 10x worse at 0.5 micron than IFO room.
Every entry from well pressurized control room into barely pressurized IFO pumps dirty air to our "clean room."
This door should be closed.
The drill- room entry is ideal because it is using the same air conditioner as the main lab, therefore it has cleaner air.
Things to do: seal holes of CES walls, seal paint wall at south end so it will shed less, replace gas kits on doors.
I have plugged the cable tray space entering the control room above Rosalba. |
Attachment 1: 3xJuly4Cal.png
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Attachment 2: whichOne.jpg
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9181
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Tue Oct 1 11:24:02 2013 |
rana | Update | PEM | particle counts |
Probably more important is to establish quantitatively how particle counts affects the lock acquisition or noise in the interferometer.
We don't want to adopt a "Sky is Falling" mentality as was done previously in LIGO when people were trying to outlaw burritos and perfume.
Dust monitor counts and human noses do not correlate well with the interferometer's nose.

When the vacuum system is closed, we might check to see if particle counts correlate with losses in the PMC or excess scatter on the ISC tables. If not, we should move on to other concerns. |
1964
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Thu Sep 3 10:19:35 2009 |
steve, alberto | Update | PEM | particle counts and burning hillsides |
The San Gabriel mountain has been on fire for 6 days. 144,000 acres of beautiful hillsides burned down and it's still burning. Where the fires are.
The 40m lab particle counts are more effected by next door building-gardening activity than the fire itself.
This 100 days plot shows that. |
Attachment 1: fire6d.jpg
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Attachment 2: 40mgarden.JPG
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Attachment 3: 40mgarden2.JPG
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Attachment 4: RBLOG-FIRE-SKY.JPG
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1665
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Wed Jun 10 09:06:12 2009 |
steve | Update | PEM | particle counts and turbulance |
I moved the mobile HEPA filter from ITMX's north door to ITMX-ISCT and covered it up with a merostate tent to accommodate the aluminum foil particle measurement on June 5
It lowered the 40m baseline counts by about a factor of 3 of 0.5 micron and a factor of 2 of 1.0 micron.
The HEPA filter is sweeping the floor and blowing the particles upwards. The MET ONE counter is on the top of the IOOC looking south at ~75 degrees upward.
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Attachment 1: parturbulnc.jpg
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Fri Mar 20 11:01:02 2009 |
steve | Update | PEM | particle counts are high |
The outside particle counts for 0.5 micron are 3 million this morning at 9am. Low clouds, foggy condition with low inversion layer.
This makes the 40m lab 30-50K
I just turned on the HEPA filter at the PSL enclosure.
Please, leave it on high
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Attachment 1: particles32d.jpg
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Thu Nov 8 11:40:21 2007 |
steve | Update | PEM | particle counts are up |
I turned up the psl HEPA filter to 100%
This 4 days plot shows why |
Attachment 1: pslhepaon.jpg
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Wed Jun 6 15:12:29 2018 |
Kira | Update | PEM | parts from lab |
Got this 1U box from the Y arm that we could potentially use (attachment 1). It doesn't have handles on the front but I guess we could attach them if necessary. Attachment 2 is a switch that could be used instead of a light up switch, but now we need to add LEDs on the front panel that indicate that the switch is functional. Attachment 3 is a terminal block that we can use to attach the 16 gage wire to since it is thick and attaching it directly to the board would be difficult. If this is alright to use then I'll change up my designs for the front panel and PCB to accomodate these parts. |
Attachment 1: IMG_20180606_141149.jpg
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Attachment 2: IMG_20180606_141851.jpg
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Attachment 3: IMG_20180606_141912.jpg
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Thu May 24 16:08:12 2018 |
Kira | Update | PEM | parts list |
We will need to order a few things for our final setup.
- 1U box to place the heater circuit and temperature circuits in. The minimum depth that will fit all the electronics is 10 inches according to my sketch.
- I found two possibilities online for this. I don't know exactly what our budget is, but this one is $144. According to the datasheet, the front panel is less than 19 inches wide, so if we are to order this one, I've adjusted the width of the panel I designed to match the width of the panel that comes with it I've labeled it in the attached file as 1U-panel-1.
- The other possibility is this one. It comes with handles already which is quite nice. I wasn't able to find a price for it on the website.
- Front panel for the 1U box and block panel. I've attached them as .fpd files below in one .zip file. Not sure if this is the correct way to attach them, though.
- We'll also need a 16 gauge cable that has 6 wires bunched together. This is to connect up the heater circuit and AD590s. The other cables that we will need can be found in the lab.
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Attachment 1: front_panels.zip
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Tue May 29 16:22:43 2018 |
Kira | Update | PEM | parts list |
I've updated the parts list to be an excel document and included every single part we will need. This is ony a first draft so it will probably be updated in the future. I also made a mistake in hole sizing for the front panel so I've updated it and attached it as well (second attachment).
Edit: re-attached the EX can panel fpd file so that everything is in one place |
Attachment 1: parts_list_-_Sheet1.pdf
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Attachment 2: 1U-panel-2.fpd
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Attachment 3: EX-can-panel.fpd
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Mon Feb 11 18:44:34 2013 |
Jamie | Update | Computers | passwerdz changed |
Password for nodus and all control room workstations has been changed. Look for new one in usual place.
We will try to change the password on all the RTS machines soon. For the moment, though, they remain with the old passwerd. |
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Wed Sep 29 01:53:44 2010 |
rana | Update | PSL | paths broken and VCO turned off |
I found that several linux libraries have been moved around and disabled today. In particular, I see a bunch of new stuff in apps/linux/ and ezca tools are not working.
Who did this and why is there no ELOG ???
Also found that someone has pulled the power cable to the function generator I was using to set the VCO offset. This is the one on top of the Rb clocks. Why?? Why no elog? This is again a big waste of time. |
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Thu May 14 00:47:55 2020 |
gautam | Summary | Computer Scripts / Programs | pcdev1 added to authorized keys on nodus |
This is to facilitate the summary page config fines to be pulled from nodus in a scripted way, without being asked for authentication. If someone knows of a better/more secure way for this to be done, please let me know. The site summary pages seem to pull the config files from a git repo, maybe that's better? |
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Thu Jul 1 10:26:34 2010 |
steve | Configuration | VAC | pd68 at vacuum normal state |
Slow pump down _pd68 has reached the vacuum normal state. CC4_Rga region is pumped now. The RGA is still off.
Precondition to this pump down: 129 days at atm, ITMs replaced. MMT, oplev and other components were removed from BSC, ITMCs. New MMT mirrors are in. IOO_access_connector was out. The end chambers were not opened.
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Attachment 1: pd68slow2d.jpg
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Attachment 2: pem134d.jpg
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