Discussions regarding the preparedness of Y-end for pump-down revealed an uncertainty as to whether all of the non-Class A items had been removed from BSC6.  BSC6's North door had been "hung" with (4) bolts several days ago, as is typical during long periods of in-chamber non-activity, with the understanding that re-entry into BSC6 would occur.  Re-entry was not needed and, days later, Apollo was instructed to install the remaining door bolts to allow us to pump-down the Y-end station.  In order to be certain, BSC6's north door was removed today and, indeed, several non-Class A items were discovered inside.  These were removed.  The door was re-installed after a signed Chamber Exit Checklist was presented to Apollo.  

Apollo disassembling the clean room over BSC6, recurrent ADC overflows on H1IOPSEIB6, large motion on suspensions
Sheila transitioned the LVEA to laser safe
Filiberto pulling cables to HAM5
Jodi, Mitchel, moving soft covers on the doors of HAM2 to prevent interference with ISI
9:39 Dave restarted the DAQ to remove h1ecatc1 channels from the EDCU
2 take cover drill phone messages from Hanford
Dave working on alarm settings
Sheila transitioned the LVEA to laser hazard
12:45 Cheryl starting work in HAM2,3, flashing MC, checking beam paths. Soft covers eventually removed from both HAM2 and HAM3 due to interference with ISI
Washington Crane onsite for crane inspection
2:28 Vacuuming at end X begins sets off dust counter
3:27 Michael R., Pablo going into H2 PSL enclosure to work on PCAL
Door removed from BSC6 to remove items in preparation for vacuum pumpdown. Kyle to start pump, but not attach it to the chamber yet.

I have reconfigured the cds alarm handler to raise alarms on the IOP STATE_WORD (that which is shown on the new CDS OVERVIEW medm screen). The state word goes into red major alarms except if the OVERFLOW condition is set in which case it is a minor yellow alarm. I took the opportunity to bring all the safe.snap burt restore files for the IOP models up to date.

The ALS SHG is now producing 0.57 mW of 532 light. One thing that I noticed while optimizing things is that the performance of the dichroics depends quite a bit on the polarization of the IR beam, so I had to add a second dichroic so that I could optimize the polarization.  I also moved the DC PD into the main green path to have a better monitor of the green power than the pick off beam.  

Some power measurements in the doubling path:
Infared powers:  240mW coming onto table
Pick off for IR DC PD: 9.85mW
remeasured main beam after pick off: 247mW (measured at waist)
The first dichroic rejects 239mW of IR
IR through first dichroic varies with polarization from 200uW to 66uW, I need to remeasure the value now that I optimized the polarization
After the second dichroic I don't see any light when the SHG temp is far from phase matching (not more than 2uW), which is independent of polarization.  

A partial phase matching curve is attached.  The thermistor calibration is only rough, so the temperature read out is not really linear with the actually temperature over 10s of derees C, so the measured curve is not exactly a sinc function.  

Last night I left the SHG running overnight, the second plot attached is the effective nonlinearity (green over IR^2), conversion efficiency (green/IR), green power and IR power each normalized to their means.  You can see that over 15 hours, the power from the PSL slowly drifted up, which the green power also did.  All the fluctuations except for one glitch at 13.5 hours are well within the 5% requirement from T1300174.  

The last plot is a histogram of these normalized values, the standard deviation of the green power is 0.67%.  

The data and m file are also attached.  

• Longitudinal: -0.4 mm (South, -X)
  • Tolerance: ±3 mm
• Lateral: +0.1 mm (West, +Y)
  • Tolerance: ±1 mm
• Vertical: +0.4 mm (high, +Z)
  • Tolerance: ±1 mm
• Pitch: 7 µrad down
  • Tolerance: ±55 µrad
• Yaw: 52 µrad CCW
  • Tolerance: ±190 µrad

The ITMy elliptical baffle was also aligned in lateral and vertical position.  Its final aligment errors are:

• Lateral: +2.2 mm (North, +X)
  • Tolerance: ±7 mm
• Vertical: -2.4 mm (low, -Z)
  • Tolerance: ±7 mm

The ITMx elliptical baffle was not aligned due to a mounting issue described in aLOG 6104 and its comments.  This baffle was left in the chamber so as not to hold up progress on chamber close out for the HIFO-y test.

  Andres R. & Jeff B.  

   We completed taking the Transfer Functions and Power Spectra data for I1-PRM. The data files are attached below. There is a small peek at 0.85Hz, which is suppressed under damping. All scripts and data files have been committed to the SVN repository. We will wait for the testing group to review the results data before taking additional action on I1-PRM.     

The EDCU had problems with the ECATC1 ini file giving false connection status numbers. I removed this ini file from the DAQ and restarted at 09:39

Attached are plots of dust counts requested from 5 PM April 15 to 5 PM April 16.

I have not included plots of the counts in the optics labs, because of the 'nan' in the data when I rebooted the IOC to test a new version of the code. I did this starting at 3:06 PM April 16. The modified code should fix this bug and is scheduled to be installed next Tuesday.

Door covers are so tight the touch the ISI on both sides of HAM2.

IO closeout still to do::
- check beam on psl wall 
- flash IMC
- align REFL to HAM1 - needs coordination with ISC crew
- align HAM2 QPD
- check all baffles
- check POP/ALS path in HAM3
- align West side of HAM2 beams with viewport simulator.

Viewport simulater was crammed in the HAM2 clean room across the steps, so had to be moved, and will need to be wiped again before hanging on an open HAM2 door.

The two steering mirror assemblies, D1101851, are installed in BSC2. They went in fairly smoothly. One hitch is where the support bracket attaches to the chamber's lower bracket; the weld from the lower bracket to the chamber wall kept the two surfaces from mounting flush.

The two mirrors are NOT installed yet. They oxidized during their bake and I am still working on figuring out if anything should be done about that. The mirrors shed a little, but it seems as though they are not shedding anywhere near the level that the chamber itself is.

We set up Viton Pads under HAM3-ISI balancing masses. The size of those pads is the same as the size of LLO's. However we set those pads under 1/2 the mass LLO uses, in order to rise the corner frequency of the mass+Viton stack.

Comparison before/after is attached.

The Viton Pads improve the 310Hz peak in V efficiently, by a factor > 5 without any drawback to it. Results are satisfying enough for now. We may try other configurations next time the chamber is open.

08:00 Reset all the alarm handlers 
09:30 Start measurements (Transfer Functions) on HAM 3 ISI – Hugo P
10:45 Start/Continue assembly work on H2 LAE PCAL – Pablo
12:10 Work (Inspection)on LVEA main crane – John Worden
13:45 Cable work by HAM 4 on the LVEA – Filiberto C.
14:49 LVEA Transitioned to Laser Hazard - Cheryl
15:00 IO Alignment on HAM2/HAM/3 in the LVEA – Cheryl

Restarted the DAQ at 15:14 and 15:17. Added all h1seib3 systems (IOP, ISIITMX and HPIITMX). Also added back the ECATC1.ini EDCU file to support slow controls commissioning.

Needed two starts, three of the Beckhoff channels do not seem to exist and were commented out.

Measurements are complete on HAM3-ISI. The Apollo crew can proceeed there.

Gerardo finished up the optical lever periscope for the BS.
The  Y-arm baffle is aligned. 
The  Y-arm baffle needs to have the brackets removed to fully suspend it...do not forget this
The  X-arm is not aligned due to the mounting bolt pattern issue he encountered
The platform remains inside under the X baffle
IAS needs to finish breaking down our equipment and stowing it

Mitch, Jim, Hugo,

HAM2-ISI was repayloaded, rebalanced, and its lockers (all) were adjusted. We gave HAM2 back to SUS so they can proceed with testing.

 CPS readouts (counts) with the ISI locked, and unlocked, are displayed below.

Even though they are a bit mis-centered (away from 0cts), CPS Targets are far from contacting the sensor. We will leave the CPSs un-zeroed and use a bias in the control loop, as we have done so far.   

Cables rubbing against the chamber/support tubes could be an issue for HEPI commissioning. We took care of dressing the cables away from the chamber and the support tubes, as we could without unplugging anyone (See attached Pictures). It is good practice to always adjust installed cables so they are cleanly dressed, away from the chamber and the support tubes, before connecting them to a feedthrough.