NAOJ GW Elog Logbook 3.2
See the attached PDF file
The zip-file seems to be password protected.
May I ask for the password?
In order to write my paper/report on the calculation that I have done on scattering of the mirrors, I asked Hirose-san to give me the PSD of the BS.
He kindly responded and gave me the data quickly so that I can now derive the rms surface roughness and so one for further calculations.
I think these kind of information might be interesting for other application too.
The vacuum chamber to be used for the macroscopic quantum measurement experiment was delivered to NAOJ and now stored temporarily at the TAMA center room. It will be moved to Tohoku University within April.
The photos are here:
(Sorry for the late entry)
The cryostat was installed at the ATC on Mar. 26th (Thu).You can see the photos here:
The cryostat was just put in place, but no test was performed at this time because they want to bring it back in a few weeks. Here is the reason. At their factory, the company performed a cooling test, but they could not cool the sample stage as quickly as they thought. There must be something wrong with the system, but they did not have time to track down the issue. Therefore, they delivered the sytem once to the NAOJ. But they need to bring the system back to their factory to fix the problem.
In any case, the cryostat will be in the ATC at least for a few weeks from now. So we can use it as just a vacuum chamber. We are planning to perform a rough leak test of the geophone canisters using this "vacuum chamber".
Today, I connected the vacuum pumps and wired up them. Now the pumps (scroll + turbo) are running. At the time I left the lab., the vacuum level was about 1e-1 Pa. I plan to leave the pump running for a while. The photos of today's vacuum work can be found here:
Last week, Torii-san measured the backscattering properties of DLC and soot of a candle distributed on an Aluminum surface.
I have now calculated the respective BRDF. The DLC backscatter is now symmetric and shows a sharp and strong peak (>100 1/sr) for its specular reflection. The wide-angle scattering is similar to MV from A.
The soot shows no specular reflection peak but a more or less equally distributed scattering also at wide incident angles. The wide-angle scattering is 1.5-2 times the one from MV.
(for more details, just ask me)
I finally succeeded in calculating the up-conversion of seismic noise in the Kamioka-mine with both Mathematica and Scilab.
I just wanted to follow the thoughts from Flanagan and Thorne which give a procedure how to do the up-conversion from a given spectral noise distribution. Anyway, I also did the explicite calculation by using the time-dependent noise data from the Kamioka mine from Sakakibara-san.
Both calculations are consistent with each other.
Now, I only need the transfer functions for the various devices on which I did scattering/noise calculations to complete them.
Summary:
I soldered a geophone preamp to a geophone and tested it with the cable Aso-san made previously ( http://www2.nao.ac.jp/~gw-elog/osl/?r=47 ) and the IO chassis at the TAMA West End.
Details:
The original geophone connector has been cut off, leaving five individual wires. I used an ohmmeter to identify them:
Red/White - main coil, 5.5 kohm
Blue/Black - calibration coil, 6.8 ohm Green - ground
I traced the pin names from Aso-san's cable through to the preamp:
* The Amphenol MIL-DTL-26482, Series 2, Matrix 10-6 plug on the end of the cable is a female. The A pin is labeled and can also be identified as the one near the widest of the three locating lugs. Pins B to F continue anticlockwise. See geophoneplug.jpg.
* The Amphenol socket on the outside of the geophone canister end cap is a male. The A pin is near the widest of the three locating grooves, and pins B to F continue clockwise. See geophoneendcapsocket.jpg.
* The six-pin connector on the inside of the geophone canister end cap is a male. The A pin is identified by a dimple in the grove around the pins and pins B to F continue anticlockwise. See geophoneendcaprear.jpg.
* The front side of the circuit board has six female sockets. When the silk-screen text is right-way-up and the large white arrow is at the top, the A pin is at the BOTTOM! Pins B to F continue clockwise. See geophonepreampfront.jpg.
* The back side of the circuit board is what will be visible in the final stages of assembly. When the silk-screen text is right-way-up, the A pin is at the BOTTOM! Pins B to F continue anticlockwise. See geophonepreampback.jpg.
This means that to assemble the preamp and canister end cap, you should orient the end cap with the dimple at the bottom and place the preamp with text right-way-up.
I then soldered the red lead to the INPUT-GEO terminal, the white lead to the GND-GEO terminal, and the green lead to the GND. This was very awkward because I tried to do it so as to allow later assembly of the canister, which meant the wires needed to pass through the canister flange, with the preamp and geophone stranded on opposite sides. See Geophone Test.pdf. In fact it was so awkward that I think it needs to be redone with connectors rather than soldered joints. However it was good enough to allow a test to verify the connections.
I took the geophone and preamp down to the West End and set it up on one of the optic lever pillars (as a convenient solid platform) using clamps to prevent it moving. I used the geophone cradle for this test rather than trying to get the geophone into the canister body. See geophonetest.jpg
I powered up the geophone distributor in the West End IO rack. I connected a straight cable, a gender bender, the geophone adapter cable and the geophone canister end cap (but not the preamp) as Geophone #0. I checked that the power was reaching the expected pins. I then plugged in the preamp.
Sekiguchi-san had been using ADC channels 4-7 to test some other signals, so I plugged the geophone distributor output into ADC channels 0-3. As expected the geophone signal showed up on one of the LVDT channels.
Took a pic of two LED candidates:
- OP232 (the golden one)
- TSTS7100 (the silver one)
The packages seem similar forms, but be careful, positions of the anode and cathode are opposite!! to the flange's boss.
Please check the following files showing the modifications of OSEM LED and PD holders for PR2 and PR3 (hope - only) . The concept is that using already exisiting parts as far as possible anyhow!
The design will be checked by VIS people, and then a few test parts will be purchased.
Some parts of the LED assy and all parts of the PD assy have compatibilites with new (unapproved by VIS still) design of OSEM LED/PD holders in the following.
Hope they are approved immediately, and then I'd like to start with purchasing a few samples. I have already got some cost estimations from several companies and started comparison.
The reason why some parts have JGW-Dxxx, but others not is, I guess, there would be some difference in the concept for controlling things between VIS and me.
Torii-san has created a conical baffle for cutting down the ghost beam. We readjusted the scatterometer and Torii-san is again measuring the DLC sample. We will see whether the asymmetry in the data is still there or not. If yes, I guess its origin in the multiple reflections of the beam splitter.
and asked the manufacture company about the cost reduction.
Those parts are for box structres of IM and IRM.
Hope the oreder can be done soon (in low cost!)...
Some information
http://www.zairyo-ya.com/info/zaisen_tebiki_2.html
http://www.labnotes.jp/pdf2/aluminum.pdf
http://www.toyo-success.co.jp/product/characteristic_a.html
http://fa.misumi.jp/product/plate/prty.html
Meeting
About a TMS's vibration isolation system, I (and Aso-san) had a meeting with some Japanese agents of the company A today.
The vibration isolation system is an active/passive VIS leg (of course vac compatible, they said).
For example, an idea of the application is that those three legs would support an optical table for the TMS.
To do
In the next week, I will send them more detailed and compiled information of the TMS including foreseen its structure, and then they can start the cost estimation.
and asked the manufacture company about the cost reduction.
Those parts are for box structres of IM and IRM.
Hope the oreder can be done soon (in low cost!)...
Some information
http://www.zairyo-ya.com/info/zaisen_tebiki_2.html
http://www.labnotes.jp/pdf2/aluminum.pdf
http://www.toyo-success.co.jp/product/characteristic_a.html
http://fa.misumi.jp/product/plate/prty.html
From a paper from Toukoku-san (2014), I have calculated the maximum magnetic dipole moment of solblack. It is 6*10^-5 Am^2.
From this, I have rerun the program and calculated the maximum influence of a magnetized wide-angle-baffle (non-suspended). The results can be seen in the graph attached to this report.
Torii-san has measured the DLC sample and discovered a small unsymmetry between "positive" and "negative" angles.
I will try to search for en explanation.
Regarding the ghost beam. Torii-san wants to create a conical shaped baffle (blackend by candle-soot) to avoid an influence of ghost beams and, at the same time, keeping the symmetry. I think that the ND filter is in a first glance OK and we should focus on the sample holder for solblack. After this, we can think of this baffle.
Today, the enclosure of the compressor for the cryostat at the ATC was installed. It is a very tall one indeed.
The actual installation of the cryostat will take place on 26 and 27 of March.
Summary:
I soldered long pins to the geophone pre-amps to be used for the TAMA prototype test. I also made an adopter cable to convert the amphenol MIL-C-24682 10-6 connector to a D-SUB 9 so that we can connect the geophone output to the digital system.
I made three pre-amp circuits and one conversion cable. The next step is to connect the pre-amp to a geophone and connect it to the digital system through the converion cable to see if this chain of signal flow works or not.
Details:
Pre-amp circuit issue:
There are 6 pins sticking out on the pre-amp PCB. These were soldered during the in-air tests and the pins became unusable. These are ITT/Cannon 031-9074-002. I ordered 20 of them. When I got these, I found that the pins had a thick section at the end, which prevented them from inserted into the holes on the pre-amp PCB. After consulting with Okada-san of ATC, I decided to cut those unwanted section with lathe. It was a fun since it had been a long time since the last time I used lathe :-) After the machining, I soldered those pins into the pre-amp circuits.
Conversion cable:
The output from the air-tiight container (vacuum pod) of the geophone is Amphenol MIL-C-24682 10-6 (6-pin) (http://www.mouser.com/ds/2/18/26482_10-469475.pdf).
We need to make a conversion cable from Amphenol to D-SUB 9 as suggested by Mark's cabling document (http://gwdoc.icrr.u-tokyo.ac.
Amphenol <- Flat twisted pair cable -> D-SUB
(A) +14V <- Brown -> D-SUB pin 9
(E) and (F) are twisted.
Next step:
We should connect them all (including soldering of geohone output cables to the pre-amp PCB) and check if the signals are as expected.
Concerns:
Although I tried to keep the flange of the vacuum pod as clean as possible by putting on latex gloves, I think the flange and the cable, which are supposed to be put into vacuum, are not so clean. We need to clean them before installing. Also I wonder how the cables will be assembled for real KAGRA.
Resources (compiled by Mark):
(B) SIG RET <- Red -> D-SUB pin 2
(C) POWER RTN <- Orange -> D-SUB pin 5
(D) +14 <- Yellow -> D-SUB pin pin 4
(E) OUT P <- Green -> D-SUB pin 1
(F) OUT N <- Light Grey -> D-SUB pin 6
http://gwdoc.icrr.u-tokyo.ac.