Ops Summary – 9/24/2013 Work at LVEA (drilling holes) – Apollo Work at End X (cabling) – Filiberto Work at LVEA (Packing and transporting baffle parts) – Thomas Vo H1ISI HAM6 restart – Hugo Cleaning work on BSC9 and surrounding areas at End X – Christina/Cris/Karen H1ISI HAM2/3/4 restart – Hugo
Sebastien, Hugo
Ran an svn up on userapps/trunk/isi/common. Details of the svn up are attached.
(Alexa, Kiwamu, Daniel, Paul, Joe)
We started work on HAM1/ISCTI yesterday (please refer to D1000313 for HAM1 layout). In particular:
1) we moved the green path mirror M10 over by 4inch from its pervious location (away from M10, toward the PSL side)
2) we used the IR beam to approximiately align the green path onto the bottom periscope mirror of ISCT1 with this new location for M10
3) we moved the IR mirror M13 to be approximiately 8inch from M11 (on the HAM2 side)
4) we aligned the IR path onto the bottom periscopre mirror of the ISCT1
The green and IR path reach the bottom of the periscope at a suffecient seperation such that they each are centered on their own bottom periscope mirrors. We have also begun alignment of the IR path onto the SHG on ISCT1.
Here is a link with pictures.
Daniel S. moved the dust monitor at location 9 and turned it on. For some reason this glitched the communications and I had to restart the IOC.
Done.
The only remaining thing is that the telescope mirrors are not protected for the moment.
I kind of remember that we used to use a sock to protect the entire TMS structure during the cartridge move at EY, and if we can do the same that should be fine.
1/4 - turn cw -> attempt to bring dewar head pressures closer to nominal value of <10psi (value) <15psi
[Alexa and Kiwamu]
As a preparation for the upcoming HAM1 installation work, we applied some modifications on ISCT1. ISCT1 is now ready for the HAM1 in-vacuum work.
Replacement of a top periscope mirror with a dual-wavelength mirror
We replaced the upper mirror of the middle periscope by a 2" dual-wavelength mirror so that it reflects both 1064 and 532 nm at once. Note that we had three periscopes on ISCT1 (see D1201103-v13 for the diagram) and the one we modified today is the middle one which used to reflect only green light. The mirror we newly put is E1000425-v3 which we took out of the LSB clean room.
Installation of an infrared bottom periscope mirror
We installed a 2" infrared high reflector. This will take care of the PSL doubling infrared light directed by the upper mirror of the middle periscope. Unlike the usual bottom periscope mirror this one simply stands on the optical table instead of being attached on the periscope structure. We stole one of the 2" infrared mirrors from the rightmost periscope and then mounted it for this bottom mirror. Note that we are not going to use the rightmost periscope mirror any more for steering the PSL doubling light and therefore we removed it (see below).
Removal of the rightmost periscope
We removed the rightmost periscope which had been taking care of the PSL doubling light. The periscope is now put nearby the entrance of the squeezer bay.
Removal of a light pipe
We removed the light pipe which was for the lower right viewport of HAM1 since we are not going to use this port any more. The yellow cover and the lexan guillotine were put back to protect the viewport.
Removal of lexan protection plates (a.k.a. guillotines)
During the removal of the rightmost light pipe, we noticed that the rest of two light pipes somehow still had the lexan guillotine in. This is not great because we know the lexan plate does something bad (see for example alog 6073). We are not sure if they had been there all the time during HIFO-Y. We took them out and put the metal cover on the slot because there is no point to keep them in there.
Had been valved-out last week during RGA scanning
On friday, the IO Chassis for SEI was replaced. Second DAC card had offset voltage on some channels without any excitation signals. The offsets were also present with the front end computer off. Tried re-seatting DAC card and even replaced second DAC card, which gave same results.
Attached are plots of dust counts requested from 4 PM September 19 to 4 PM September 20.
I am running conlog-1.0.0 in 'screen' on h1conlog over the weekend as a stability test. The binary is named 'conlog' and is in /ligo/apps/linux-x86_64/conlog-1.0.0/conlog/bin/linux-x86_64. It is currently monitoring 86,948 of the 97,697 process variables listed in /ligo/lho/data/conlog/h1/pvlist_1379718940_no_HPI-PUMP. As of 6:50 PM there are 179,869 rows in the h1conlog.data table.
This morning, from the outside, it appeared to still be running. The EPICS status channels are still there, and the keep alive is updating in the database. However, logging into the server reports that there is 1 zombie process and there are no terminals listed with the 'screen -ls' command.
I've restarted the computer and started it from the local terminal instead of in 'screen'.
Cabling at End X – Corey Work on Seismic Coil Driver at End X –Filiberto Squeezer area Transitioned to Laser Safe status - Alexa Annulus Ion pump work by BSC2 – Kyle Floor repair at End Y - Craftman Getting Baffle parts ready for installation at LVEA – Thomas/Gerardo/G2
Utilized snorkel Genie lift and Main Crane
I've made some changes to the CDS wireless access points, they will now only allow a certain list of known CDS computers to connect (this is in addition to the authentication already in place). If you come across a *CDS* computer that is not working and you think it should be, let me know. In addition, 802.11n data rates are enabled on all of the access points now that all the old OS X installs that caused issues with these data rates have been removed. This should make things a little faster for wireless clients on the network.
Yesterday I was asked by Keita to measure the reflectivity of a beam splitter which will be installed in HAM1 next week. This is called M14 in D1000313. I measured it at the OSB optics lab.
According to my measurement :
R = 99.4 +/- 0.1 % for S-polarizing beam at 1064 nm 45 deg.
R = 94.8 +/- 0.9 % for P-polarizing beam at 1064 nm 45 deg.
Some details :
I used the laser which was already setup for the reference cavity and squeezer experiment in the OSB lab. Conveniently there was a PBS already setup after a Faraday on the table and I used it for specifying the polarization of the beam. I put a pick off high reflector in both the transmitted and reflected sides of the PBS so that I don't destroy the existing setup. Then I directed these beams aside and put the BS that I wanted to measure. The incident angle of the beam should be pretty close to 45 deg with an accuracy of 1 deg or so. This was established by comparing the ray trace with the hole locations on the table. Also I put an ND1 attenuator to reduce the power to less than 100 mW so that my power meter can handle.
I measured the power of both reflected and transmitted light of the BS using the Ophir handy power meter. I assumed that loss is very small.
For S -polarization I obtained the following two numbers (also as shown in the attachment ):
R = 42.8 mW / 43.1 mW = 99.3 % and R = 1 - 213.1 uW / 43.1 mW = 99.5 %.
Therefore a plausible reflectivity can be
R = (99.3 % + 99.5%) / 2 = 99.4 %.
The estimated deviation of this mean value is
sqrt( (99.3 % - 99.4%)^2 + (99.5% - 99.4%)^2 ) / sqrt(2) = 0.1 %.
In summary R at S-pol is 99.4 +/- 0.1 %
I applied the same procedure for P-pol and obtained 94.8 +/- 0.9 %. This number is close to the specification which is "95 % P-pol".
I have added this result in DCC as a supplimental document. See E1000871-v1.
DougC and RickS On Tuesday, we measured the minute trends of the environmental channels over the past week (see attached figure). Ch. 16 is (supposedly) the particle counter in the H1 Diode Room. Either the dust monitor is malfunctioning, or we are having a lot of dust events at the 100,000 count level.
Bugzilla ID 413 has been opened to address this apparent H1 Diode Room dust glitch issue. Attached are two plots, the first the trend of the particle counter (supposedly in the H1 Diode Room) over the past week and the second a detail of one of the glitches.
Did anyone enter the diode room and look at this dust monitor?
(Jeff, Kiwamu, Stefan) With the H1:LSC-REFLAIR_A_RF9_I calibrated in Hz, and the open loop transfer function measured, here is the noise it sees: Input Mode Cleaner transmitted frequency noise. Also plotted is dark noise (shutter closed). We do not know yet what the ugly noise ~1/f^3 noise is.
The loop transfer functions are attached: Open loop gains: CARM_OLG_RED.txt CARM_OLG_GREEN.txt Closed loop gains: CARM_CLG_RED.txt CARM_CLG_GREEN.txt Inverse closed loop gains CARM_iCLG_RED.txt CARM_iCLG_GREEN.txt Inverse closed loop gain with a factor of 1/2 gor Green Hz to Red Hz conversion: CARM_iCLG_RED_g2r_special.txt
S. Ballmer, J. Kissel We had made an estimate for the coil driver noise in low-noise mode (State 3, ACQ off, LP ON), and ruled it out. However, I've checked the state of the Binary IO switches, and MC2 is running in State 2, ACQ ON, LP OFF, and and MC1 and MC3 are running in State 1, ACQ OFF, LP OFF. We'll try for this measurement again, with the coil drivers in their lowest-noise mode.
I've plotted the above-attached, red and green, open loop gain transfer functions (see *_full.pdf attachment). Through trial and error, I figured out that the text file columns are (freq [Hz], magnitude [dB], phase [deg]). And remember these are IN1/IN2 measurements, so it's a measurement of - G, not G (which is why the phase margin is between the data and 0 [deg], not -180 [deg]). Also, because the data points around the UGF were so sparse, I interpolated a 50 point fit around the UGF to get a more precise estimate of the unity crossing and phase margin. See _zoom.pdf for a comparison of the two estimates. I get the following numbers (rounded to the nearest integer) for the raw estimate and the fit estimate: The raw CARM UGF is: 136 [Hz], with a phase margin of: 33 [deg] The Fit CARM UGF is: 146 [Hz], with a phase margin of: 30 [deg] The raw CARM UGF is: 169 [Hz], with a phase margin of: 35 [deg] The Fit CARM UGF is: 170 [Hz], with a phase margin of: 34 [deg]
