jim.warner@LIGO.ORG - posted 15:56, Friday 22 November 2013 (8700)
HAM3 HEPI unlocked, post chamber close.
Deed was done ~10 am local.
Deed was done ~10 am local.
Day Shift Summary LVEA Laser Safe Patrick – Changing dust monitoring sample and hold times on several dust monitors Gerardo – At End-Y Filiberto – At End-Y working on the Beckhoff system Jonathan – Recovering equipment from LVEA Cory – At End-X gathering TMS parts for shipment to LLO Sebastian – Restarting HEPI models Hugh – At End-Y working on HEPI Dave/Jim – Restart the DAC Dale – At End-Y checking on P-Cal Install Scrap Metal Recyclers on site to change out collection containers Cyrus – At Mid-X to swap media converters
I swapped out the DAQ Netgear switch at MX for the appropriate media converter, to reclaim this switch for other purposes. This matches the earlier change for the FE switch for MX/h1pemmx. h1pemmx was restarted successfully.
The H1SUSIM model died at 9:15 AM PST with an error of ADC timeout. The h1susim and h1iopsush2b models were restarted about 10:22 PST to clear the error.
After Sebastien updated the HEPI models I did a DAQ restart to resync the INI files at 11:08
The following cables for the demod concentrator readbacks (HAM6) did not have pin 19 connected as reported by Daniel Sigg https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=8640 : H1:ISC_203 H1:ISC_204 H1:ISC_205 H1:ISC_207 H1:ISC_210 Pin 19 was attached on both ends and reconnected back to electronics.
Changed shell environment scripts to properly set up EPICS_CA_ADDR_LIST depending on the network the workstation is connected to. Should be transparent to the user.
The mobility experiment camera and illuminator cans have been installed on HAM 3's west door. The associated power supply, computer, etc. are on a cart just outside of the cleanroom. Please be careful when working around these items. Also, please let me know if these need to be moved at any time or if cabling needs to be rerouted (is some minor draping over HEPI ok?). The system will only be active during periods of pumpdown or vent, so can be removed during other periods if required.
I've made some wireless AP and associated switchport changes to support the new workstation VLAN (none of which are particularly user facing).
After flushing the cut & reconnected fluid lines since 6 August at near full motor speed, this morning I reintroduced fluid to the Actuators in Bleed mode. The pressure set point was stepped up to 80psi. While these Actuators saw operation at BSC6 during the single arm period, they still may need bleeding after having the four way valves disconnected. I inspected the new connections and detected no leaks; will check again later today. We'll put these actuators into run mode early next week and we'll be in ready state. Still need wiring to the piers...
With the IR beam bath on the trans-mon ISC table (in vac) aligned, I had to move the IR telescope of the in-air ISCTEX by 3in in -x direction, and lower the top periscope mirror by maybe 4in. I moved the two-in lens on the periscope down to accommodate the top periscope mirror. Mirrors and lens were roughly aligned, but need a fine-tweak once we have a steady reference beam.
Ion pump only for 24 hours = 3 LEDs -> Decoupled aux. pump cart
I changed the sample and hold times for the dust monitors to the following: LVEA 3 Sample Time: 20 sec Hold Time: 40 sec LVEA 5 Sample Time: 20 sec Hold Time: 280 sec LVEA 9 Sample Time: 20 sec Hold Time: 40 sec LVEA 10 Sample Time: 20 sec Hold Time: 40 sec LVEA 15 Sample Time: 20 sec Hold Time: 40 sec LVEA 16 Sample Time: 20 sec Hold Time: 40 sec EX 1 Sample Time: 20 sec Hold Time: 40 sec EY 1 Sample Time: 20 sec Hold Time: 40 sec DR 1 Sample Time: 20 sec Hold Time: 280 sec LAB 1 Sample Time: 20 sec Hold Time: 280 sec LAB 2 Sample Time: 20 sec Hold Time: 280 sec LAB 3 Sample Time: 20 sec Hold Time: 280 sec
Temp dogs were removed.
Isctex green periscope readjusted as it was close to the edge.
Tele beam position readjusted so the beam is centered on the primary.
Red extraction path was done.
High power beam dump path was done.
Working on IR QPD sled path.
Picomotor cable mystery.
It seems as if picomotor ordering is flipped somewhere between Beckhoff and in-chamber.
Picomotor in-vac cable has one DB25 (called J1) on one end and four smaller cables with mighty mouse connector (J2, J3, J4 and J5) on the other. In the cable drawing (https://dcc.ligo.org/D1000238) , these four cables are numbered such that the one closest to pin 1 of DB25 is J5, the farthest J2.
Both sites agreed that J2 goes to the green 50-50 splitter (M3), J3 to the steering mirror just upstream of the periscope (M6), J4 to the dichroic that steers the IR to the sled (M4), and J5 to the steering mirror just upstream of the IR sled (M14).
Now, the aluminum collar for the picomotor connectors are labeled as "A", 'B", 'C" and "D", and it's these labels that I and Corey used, assuming that A is J2 and D is J5.
However, in the cable harness routing diagram (https://dcc.ligo.org/LIGO-D1300007), the same cable is specified such that the one closest to pin1 of DB25 is "to M1", the farthest "to M4", it is ordered starting from pin 1 of DB25, so it's the opposite of the cable drawing. So A might be J5 and D J2, and this might be it. If so, we will re-rout the in-vac cables.
I have a vague memory that Corey confirmed that A is the closest to pin1, but I'm not 100% sure.
Since there's no way we can find which cable is closer to pin 1 without disconnecting DB25, and since there's a certain risk to disconnect and reconnect in-vac DB25, I'm asking Rich Abbott if he remembers which convention was used when labeling mighty mouse connectors.
Checking Cable (D1000238) In Lab
I pulled out two random (s/n S1104585 & S1105221) Picomotor cables to check how the four Mighty Mouse connectors are marked & where they are located. On both cables, they are marked in a way which matches the drawing/our guess for EX TMS (but not for Keita's memory for what I confirmed in-chamber in Sept):
I'm re-attaching photo/note of what we saw when we tested the Picomotor cable at the Test Stand next to the BSC (we observed the switched around order back in Sept):
(Alexa, Stefan, Kiwamu, Keita)
The convention at both LHO and LLO for the picomotor in-vac cables is as follow:
Unfortunately, the in-vac cables in HAM6 had cable "A" = J2 closest to pin 1 and cable "D" = J5 closest to pin 13; however the opposite is desired. This explains the switch. We have swapped the ABCD cables in vacuum, and now the picomotor controls are all correct. Success!
Moral of the story: be careful with the ABCD labellings on the picomotor in-vac cabling because they don't seem to be consistent. It would also be nice to have pin 1 labeled on the outside of the cable connector so that we do not have to disconnect it to know where pin 1 is located.
The last item currently we are missing for HAM6 is a QPD sled (see 8633) from the ISC point of view. But the preparation of the sled is not going well.
ModeMaster is not functioning:
Yesterday, I was going to start preparing the sled which requires the use of a ModeMaster for the precision lens adjustment. However it seems that the germanium detector of our ModeMaster is not functioning for some reason. It worked fine with a different silicon detector, but didn't work with the germanium one. I looked at the output from the detectors with an oscilloscope. The silicone showed a square-looking, 20 Hz-modulated output and the amplitude seems depending on the amount of laser power, which makes sense to me. However, once I switched the detector to the germanium one, it showed a similar square-looking wave, but the amplitude didn't depend on the laser power. Moreover, the signal seems just railing -- it swung from -5 to 13 V in every square wave. I incline to conclude that the germanium detector became broken.
Trying to get a replacement:
I already sent an email to Adam and Valera in Livingston to see if they can lend us their ModeMaster. At the same time, I will get some technical support from the company and hopefully get some replacements.
Some pictures:
The output from the broken germanium detector on a oscilloscope when powered up. A 20 Hz square-looking wave is visible. The waveform didn't change with and without light.
The germanium detector when apart from the head.
After fixing any loose dog clamps, and retorquing, Arnaud and I took B&K hammer measurements of the HAM2 PR3, PRM, and MC1 this morning. We still need to do PR2 and MC3 (which has a temp IO alignment mirror nestled up against it's structure). We took PR3 and PRM data with vibration absorbers on and off. We only took MC1 data with the vibration absorbers on since they were already on and are difficult to remove and then replace. Plots and statements to come.
Arnaud and I snuck in and got B&K hammering done on PR2 before the transition to laser hazard.
Betsy and I hammered the last suspension missing in our list: MC3.
The results are coming soon
Results are at alog 6014
LHO aLOG 6014 are different results -- from PR3, and they don't even include the results for that measurement. Arnaud and I will be processing and post all the B&K data from the HAM2, HAM3, and and BSC3 (ITMX) next week.