HAM ISI #6 Work (Corey, Hugh, Jim)
Finished off prep work(helicoiling & pressing pins) for Stage1 Walls. Have started installing the Pitchfork Walls on Stage1.
One of the Lockers looks to be a wee bit tight. We'll need to keep an eye on it, after it gets used.
I took over the afternoon part of shift, due to a sick Patrick. Here are some of the afternoon activities:
BSC6
Misc
In the desire to be able to do some repair and testing of podded seismometers I have retrofitted VBO A with a Neon calibrated leak, a LN2 cold trap, and a cold cathode pressure gauge. Unfortunately the LN2 cold trap uses a viton seal, so its two valves are to isolate it from the normal bake oven operations. Pump down should be able to begin tomorrow for leak checking and maybe even a test.
Vincent launched the SUS ITMy TFs which should run for the next 7 hours tonight. Thanks, V!
Hi all, After several talks with Jeff Kissel and the LHO SUS team, we agree that a procedure for testing is needed. With my little understanding, it seems that every type of suspension goes through 7 different steps: 1. Set up the offsets and the gains for the OSEMs in the MEDM. 2. Centering the OSEMs. 3. Static test (to check out the sign of the OSEMs) 4. Linearity test 5. Diagonalization 6. Quick transfer functions with DTT 7. Full set of transfer functions What I'm trying to do since the beginning of last week is to have one/several scripts for each of these steps. These scripts would be generic and work for all type of suspensions. My ambition is to have something where the user just have to push the run button to have the results. I created two folder in the SVN: /ligo/svncommon/SusSVN/sus/trunk/Common/Channels_lists/ /ligo/svncommon/SusSVN/sus/trunk/Common/Generic_Testing_Scripts/ So far I have worked on several scripts which are working fine, but still need a little bit of adjustment (please don't touch them for now !). I will be at LHO until the end of the week. Before my departure, I will put all the informations about those scripts and how it could work (if everybody agrees) in a procedure. Cheers, Sebastien
We installed the Beckhoff slow controls computer h2ecatey at EY yesterday. This is a windows 7 32 bit Beckhoff computer, it is attached to the H2 slow controls network (formally known as the H2 PSL network). We verified it can be remotely controlled using remote desktop from the control room. It is also remotely controllable via its IPMI management port. The computer is located in the H2 front end rack, and is attached to the KVM. Its ether cat interface was connected to the Beckhoff End Link Chassis.
After Alberto and Dan re-aligned the ALS beam to the periscope, Dan installed a retro-reflector and we aligned the pick-off beam into the HWS path. There was ~120uW of power getting into this path. The concave lens that Dan substituted in last week is AR coated for 1064nm, so there is a 10% reflection off the surface of that which is hitting the inner wall of the enclosure. There is a second wedged uncoated 2" optic (uncoated on front surface, AR coated on the back surface) in the HWS beam path that is used to further attenuate the beam. There is a 10% reflection off the front surface and a 1% reflection off the back surface. (The 10% beam was significantly saturating the HWS camera, so we settled on using the 1% AR beam). We aligned the rest of the optics to get the 532nm beam onto the HWS. The incident power was ~1.2uW. With two OD 0.5 filters in front of the HWS, it was only just saturating with an exposure time of 9ms (and dead time of ~8.5ms between exposures). We removed one of the OD0.5 filters and set the exposure time to 1ms, (with dead time of 16.5ms) to only just saturate the camera (although this produced streaking in the image that is characteristic of long dead times). From this I estimate that we'll want roughly 50x attenuation to get the camera to run at 57Hz with no significant dead time between exposures. I installed the TCS SVN on the HWS computer (called h2hwsey) and recorded some of the images from the camera to the SVN. Here is the first aLIGO HWS image ever ....
The suspension anti-imaging chassis (D1100815) has a mislabelling on it's front panel. It has three outputs on the front panel but they are labeled "IN 1-6", "IN 7-12", and "IN 13-16".
Furthermore, the actual schematic for the AI interface board also lists the channels in the connectors as inputs.
This is a project-wide issue, not specific to H2, but I discovered it in the H2 EY electronics rack, so I'm reporting it here.
The schematic and front panel drawings should obviously be fixed, but I also really think we should replace the panels on all the manufactured units, including the ones that are deployed. It's confusing and potentially dangerous to label outputs as inputs.
The 120ft cable H2:TCS-HWS_EY_CAB13 was strung between the D1200168 Beckhoff breakout box situated above the in-air ALS table (first picture) and the D1100682 EtherCAT Chassis in the CDS high bay (second picture). Thomas and I tested the pin-outs and confirmed that there was approximately 115 Ohms across pins 1 and 20 and pins 2 and 21 from the first 4-wire RTD and roughly 120 Ohms across pins 3 and 22 and pins 4 and 23 from the second 4-wire RTD on the in-air table. This cable was plugged into the back of the EtherCAT chassis in the TCS/Hartmann Sensor slot. When the TwinCAT System Manager software is fired up for this EtherCAT chassis, we can see the temperatures for the two sensors reported in Terminal "H2 End Station 2 L16 (EL3202-0010)" in channels 1 and 2, approximately 20.90C and 31.86C, the table and Hartmann sensor camera temperatures, respectively.
(Corey, Eric, Jim)
Stage-0 Moved On To Test Stand
Positioned via threaded rods on Test Stand (we DID NOT put nuts on these). Dowel pins installed on Support Posts; still need to break tangs off of helicoils on Posts.
Stage-1 Moved On To Test Stand
Starting to helicoil it.
Prepping/Building Stage-1 Walls
These Walls need helicoils installed and dowel pins pressed.
Above, should state that the Stage-1 was moved on to the Assembly Stand.
Last night, a set of transfer functions was measured on ISI-BSC8 (the first time since the QUAD was reinstalled). The plant is unchanged and instruments don't show abnormal behavior. However, we can notice a couple of new resonances probably from the QUAD (17.2Hz and 26Hz) on the stage 2 transfer functions (see attachment).
H2 ITMY in-chamber work by the SUS crew. ETMY work on ALS table H1 PSL de-install. A dust monitor inside the enclosure was moved. The exact details are unclear to me. A few contractors and visitors arrived on-site throughout the day.
PSL installation team May, 3rd 2012: The IP adresses for the Beckhoff Computer had been changed. The channel names had been changed from H2 to H1. The Interlocks had been tested. We started with the multimode alignment of the high power oscillator (see user manual for details on the alignment procedure). The boxes with PSL components, stored in the mid station had been inspected. We did not open the boxes 3 and 4, since parts, which are stored in these boxes are supposed to be shipped to india. For all the other boxes we rearranged components, going either to india or to LLO as spare parts, which means that some of the sealed bags had been opened. We stacked some of the boxes in order to get more space in the VEA.
Report for 03 May 2012 The brushing was completed today using a total of 8 drills with 2 still running (again one of these is the fin and ring with flat brush drill). The upper chamber is almost done with 1st vacuuming. There is one nozzle opening left and then the bellows protection will come off and will need to be vacuumed.
Cyrus, Jim, Dave. H2: installed the Hartmann sensor computer in the EY station on the H2 slow controls network. Changed the EPICS database from CIT to H2 channels, installed medm, connected fiber link to the ALS table in the VEA. H1: Dan installed the H1 MSR QFS writer and its SATABOY raid system. Cyrus installed the fibre patch panels from MSR to H1EE_ROOM and installed the network switch in H1EE. Jim installed the h1boot file system, h1build, and the DAQ data concentrators. FMCS network link to LSB was disrupted by an accidental hub power down. This was restored.
Cyrus, Jim, Dave. H2: installed the Hartmann sensor computer in the EY station on the H2 slow controls network. Changed the EPICS database from CIT to H2 channels, installed medm, connected fiber link to the ALS table in the VEA. H1: Dan installed the H1 MSR QFS writer and its SATABOY raid system. Cyrus installed the fibre patch panels from MSR to H1EE_ROOM and installed the network switch in H1EE. Jim installed the h1boot file system, h1build, and the DAQ data concentrators. FMCS network link to LSB was disrupted by an accidental hub power down. This was restored.
Thomas and I (with help from Dave Barker) got all the power and data cables hooked up between the Hartmann sensor camera on the ALS table (H2 End-Y) and the HWS computer (h2hwsey) outside the VEA at End-Y. After a couple of false starts where various power cables weren't plugged in, we got the camera turned on and we able to see it and control/access it on 'h2hwsey'. Also, the 120ft 37-pin TCS cable for the end-station EtherCAT chassis was installed but as I failed to indicate which end was which, it actually went in back to front with the male end in the VEA and the female end outside. We fixed this with a couple of gender changers on the cable rather spending a couple of hours pulling it out and swapping it around. We installed a Digikey Thermal pad (BER208-ND) under the table temperature sensor to improve the thermal contact with the table. We'll assess whether this helps or hinders once the slow controls are installed. The attached images show: 1. The fully connected TCS feedthrough panel 2. The back of the Hartmann camera showing the status lights for the camera and the RCX C-Link FiberOptic-to-CameraLink converter as ON. 3. The 37-pin EtherCAT cable with a gender changer attached plugged into the HWS EtherCAT cable splitter on the ALS table
The measurements on H2 SUS FMY begun last night completed but with data gathered from a tripped watchdog state on FMY M1. The script to collect the tfs calls upon a function to generate the time-series for the excitations. This function also monitors the watchdog state of whatever system it is actuating upon. When a watchdog is triggered, the script automatically resets the Epics channel "H2:SUS-FMY_M1_WD_RSET" to reset the watchdog state. The attached image shows this script may have been a bit trigger-happy with the "*RSET" button during last night's measurements. The "H2:SUS-FMY_M1_WDMON_CURRENTTRIG","H2:SUS-FMY_M1_WDMON_STATE", and "H2:SUS-FMY_M1_WDMON_FIRSTTRIG" values were all at either "0" or "1" during a "clean" period of nearly three hours. The attached image is a dataviewer plot of the full data. The "H2:SUS-FMY_M1_WD_RSET" channel was oscillating between "0" and "1" at least eleven times during this (supposedly) "clean" period. This is very concerning as our watchdogs are not correctly displaying our watchdog levels. Or this could be an issue with the function monitoring the wrong channel or channel value. Investigations are ensuing, but this is highly suspicious and inexplainable as of now.
Jim W Greg G BSC 6 has had the NW and NE vertical and horizontal actuators mounted to the foot. The SW and SE corners have only had the vertical actuators mounted while the horizontals have yet to be mounted. The lack of room and a few technical issues have made the work a little frustrating. We should be able to finish as soon as End Y returns to laser safe.
All the actuators are now attached. The whole system dropped ~.007". While the E-W and N-S translation was only ~.003".
