I updated the TCS RH model to include calculations of the power as a V*I, as R_th*I^2 (where R_th is the measured resistance of the RH before it is installed = 35.8 Ohms per segment for ITMY) and R = V / I.

The model was compiled and installed. I also updated the H2TCS_ITMY_RING_HT_CUSTOM.adl screen to show the new channels. All changes were added to the SVN.

The medm screen is attached below:

Steve O'Connor, Aidan Brooks, Christopher Guido

Wednesday night, we made a series of resistor changes to the S1103182 chassis(on both boards S1103183 and S1103184)which can be seen in yesterday's post, but today, we reverted the resistors back to the original values except for R44. These changes will be uploaded to the traveler. 

Afterwards, we tested the board (results attached as excel spreadsheet) and used the results to calibrate the H2TCS-ITMY_RING_HEATER screen. The changes to the gain and offset(in the filters) are listed below

H2TCS_ITMY_RING_HTR_SEG1_I_MON 
Offset = -3.22 counts
Gain   = -0.0247 mA/count

H2TCS_ITMY_RING_HTR_SEG2_I_MON
Offset = -7.135 counts
Gain   = -2.456e-2 mA/count 

H2TCS_ITMY_RING_HTR_SEG1_V_MON 
Offset = -145.2 counts
Gain   = 1.281e-3 V/count

H2TCS_ITMY_RING_HTR_SEG2_V_MON 
Offset = -129.9 counts
Gain   = 1.364e-3 V/count

(Corey, Greg, Jim)

Unit#2 CPS Swap

Have swapped out the Capacitive Position Sensors (CPS) on Unit#2; originally-installed ones had bad flux/solder.  All of the new CPS's were installed with the ISI Locked and we were able to get voltages (read off Voltmeter) under 0.2V [most were close to ~0V];  note:  these voltages were observed to change when one touched various Stages and when the System was Unlocked.

When installing these Sensors, we observed that 1 of the 12 had issues (the voltage remained max-ed at ~13V no matter where the Target was located); this is a Fine-range Sensor.  This one was swapped out for a spare & it was installed and operational.

After the CPS's were installed the system was Unlocked.  Vincent will now check on the functionality of these Sensors.

Here is information for the CPS Probes & Boards/Gauges:

Unit#2 Cables Inventory:

Here are the drawing numbers used for Unit2 in-vacuum cables (except for the CPSs):

Corner1
Actuators

GS13:  D1000221 -100
L4C:  D1000221 -100
Trillium:  D1000221 -100

Corner2
Actuators

GS13:  D1000221 -100
L4C:  D1000221 -100
Trillium:  D1000221 -100

Corner3
Actuators

GS13:  D1000221 -100
L4C:  D1000221 -100
Trillium:  D1000221 -100

The aLIGO TCS team has completed installing a pair of ring heaters on the lower SUS structure for BSC8.
Electrical compliance testing was passed. 
Three of the four cable sub-assemblies (indentured to D1001517) are tied to the lower structure. 
The fourth cable sub-assembly (D1001521, indentured to D1001517) has been secured to the box frame that mates the lower to upper structures.

H1's Arms are now Full Open through the End Stations for Squeezer Work

• Outbuildings are still laser safe as long as the Photon Calibrator laser is tagged/locked out
• Craning over the beam tubes is prohibited unless approved by JohnW (except for Apollo for light loads)
• High voltage restored at EY to damp ETMY
• As evening approaches, full H1 interferometer is being aligned and locked for first time since S6

- Lower 3/5's of SUS quad were coming off today, with Calum's crew from Caltech joining
- MX: BSC cleanroom frame moved or preparing to be moved to LVEA
- EX: BSC5 setting
- MY: OpLev work by Eric Black
- EY: ICC of dome in BSC6, HEPI fluid pumping in BSC6
- OSB Doors locked at 6:00pm

- H2:PSL - work on roof

- TCS crew from Caltech arrives to work on H1:TCS-ITMY (Cheryl/Aidan supervising)

- Delivery: Mount's Lock and Key arrives for work at CS (Ski supervising)

- Patrick revising dust monitor code, restarting h0epics1

All of the dust monitors being monitored by CDS in the labs and VEAs are now running with new code designed to interface with the new model of dust monitors. There are two major differences. The counting is started by the software instead of the front panel of the dust monitor. There is an array to keep better track of which types of commands caused error messages to avoid having an alarm be set, cleared and set gain repeatedly. I still have to test this code with the new model of the dust monitors.

Steve O'Conner, Aidan Brooks, Christopher Guido

Yesterday evening, we made a series of resistor changes to the S1103182 chassis(on both boards S1103183 and S1103184)as follows

R44 = 49.9 k-ohm
R63 = 69.8 k-ohm
R74 = 69.8 k-ohm
R8  = 30.1 k-ohm
R31 = 30.1 k-ohm
R43 = 2.05 k-ohm

Today, we tested the board (results attached as excel spreadsheet) and used the results to calibrate the H2TCS-ITMY_RING_HEATER screen. The changes to the gain and offset(in the filters) are listed below

H2TCS_ITMY_RING_HTR_SEG1_I_MON 
Offset = 16.48 counts
Gain   = -0.0498 mA/count

H2TCS_ITMY_RING_HTR_SEG2_I_MON
Offset = -8.827 counts
Gain   = -0.0492 mA/count 

H2TCS_ITMY_RING_HTR_SEG1_V_MON 
Offset = -82.2 counts
Gain   = 2.582e-3 mA/count

H2TCS_ITMY_RING_HTR_SEG2_V_MON 
Offset = -74.2 counts
Gain   = 2.564e-3 mA/count

Looks like there was communication to PT410

The ITMy LS is off of the QUAD and has been rolled into the adjacent cleanroom.  We utilized the lifting equipment which we erected yesterday under the care of Calum and Kurt.  All went great and the equipment very easy to use and maneuver into the tight spots under the cartridge.  Well done SYS/FMP.  Pictures to follow.  We still have to separate the chains and do a little work on the structure before handing off to the Ring Heater crew.  Maybe one more hour.  

Where a comment to an aLOG is attached under the main entry, the formatting that a user enters into the comment is not retained (carriage returns, tabs, spacing, etc.). However, the redundant separated comment (that appears at the top of the viewing page) does contain all formatting. This fix will be imperative once the requested feature of Comments Only Showing Up Under the Main Entry is implemented.

Eric and Robert were working on the optical lever test at mid Y
BSC 6 in chamber cleaning
TCS ring heater work
Preparation for removing ITMY lower structure

Plots of > .5 micron dust counts attached.

Assembly #2 had a horizontal L4C with a bad pressure sensor on Corner 3. I removed the bad L4C (pod #10) and replaced it with a good one (pod #129). After verifying the readout the wall was put back on and the stages once again unlocked. 

Soft-closed GV8*Switched XBM pumping from MTP to IP6*Burped GV7 gate annulus volume into aux. pump cart and opened GV7*Burped GV2 gate annulus volume into aux. pump cart and opened GV2*Switched Y-end pumping from MTP to IP11*Burped GV18 gate annulus volume into aux. pump cart and opened GV18

Leaving GV6 and GV8 soft-closed until end-station laser hazard issues are resolved.

The crew was split today. The dome work was completed by lunch time and the C-3 cover was replaced. Brushing in the chamber got started with 37 sections completed by the end of the day. Tool failures are running at about 50%. Four tools ran to the 1/2 hour mark and are ready for their first inspection ASAP. Four tools ran very slowly or for only short periods of time. We will retrieve chuck replacements from these and attach them to new drills and play the game again tomorrow.

Bland, Sadecki, Buckland, Torrie

Reverified that the dummy Test Mass is at 22.5mm from the bottom of the cylinder to the top of the LS frame (within the 21.7mm +/-1mm tolerance).

Today we removed the Sleeve and Vibration Absorbers from the ITMy, locked it down, unlaced the PUM and UIM Extension cables, pushed the Top Mass down to facilitate wire segment removal, removed some Top OSEMs to facilitate pushing the Top Mass down, and unclamped the Lower and Upper wire clamps at the Top Mass blade tips.  We then test fit the LSAT hanger plates and are now looking for more hardware.  We will drop the LS tomorrow.

We stacked up the LSAT Elevator onto the 5-axis lift table, on the Lift cart.  We hooked up the elevator and verified that it elevated with the controls.  After playing with the full unit a bit, Calum and Kurt decided that they still were not happy with the rolling casters on the lift cart so they re-stacked the 5-axis table and elevator onto the new scissor lift.

On Friday, Impulse response measurements were conducted using a Bruel and Kjaer (B&K) impact hammer and tri-axial accelerometer (also B&K) on the Quad  structure. The purpose of these investigations is to assess the effectiveness of the newly-installed Vibration Absorbers on the Sleeve of the QUAD structure. The Vibration Absorbers are arranged in a "spiral" arrangement around the frame of the sleeve structure of the Quad.  One VA is on each corner of the sleeve with the position heights incremented upwards around each corner - giving a "spiral" arrangement around the sleeve.

The accelerometer was positioned on the M0 chain side of the Quad on the cross brace of the Lower structure just above the Test Mass. It's X-axis was oriented along the beam path, the Y-axis crossing the beam path in the same horizontal plane, and the Z-axis vertically up through the Quad. The accelerometer's position did not change throughout each test.

Tap tests were conducted for three sub-structures of the Quad, with multiple spots selected within each sub-structure.  The three sub-structures are the Upper Structure (cage around M0/R0), the Lower Structure (cage surrounding everything below M0/R0), and the stiffening Sleeve Structure (structure surrounding the whole build) installed on August 19th. The Upper Structure had three tap test locations, the Lower Structure had four, and the Sleeve had five.  

The configuration for the BSC-ISI/QUAD system was:
BSC8 ISI - locked
H2 ITMY QUAD - unlocked, suspended with damping loops closed for both M0 and R0 chains.
Watchdogs did not trip during any of the tap tests.

Data was processed in real-time using the PULSE software provided with the B&K instruments. The PULSE software monitored for "double-hits" and for impact Force range. Data was then extracted after each measurement into .txt files that were imported and processed in Matlab. 

The VA OFF tests were conducted first. Three spots on the Upper Structure, four on the Lower, and five on the Sleeve were selected.  The VAs were then replaced to their previous locations, and the tap tests were repeated at the same locations for the VA ON tests.

The attached plots are Frequency response comparison plots of the Accelerometers in each degree of freedom (DoF) at each tap test location. The magnitude ((m/s^2)/N) of the accelerometer response is plotted against the frequency range (0.5-800Hz).

Each plot has a trace in dashed-red displaying the data from the tests with the VAs OFF and a trace in solid blue of the data from the tests with the VAs ON. Each plot is of the same tap test location for ON and OFF.

The pdf files are grouped by sub-structure (upper, lower, sleeve) and display the responses for all locations (in separate plots) on that sub-structure for a specific DoF. I have only attached the X and Y DoFs, but the Z DoF plots will be in the SVN.

Data collection parameters were:  0-800Hz response with a 0.5Hz resolution.  

----------------------
Tap Test Locations
*for location reference, when facing the Quad from the M0 chain, the "Beam Tube side" is on the right and the "Clean Room side" is on the left.*

Upper Structure:
location 1 - M0 side tapping from the Beam Tube Side across to the Clean Room side.
location 2 - R0 side tapping from Clean Room side across to the Beam Tube side.
location 3 - Beam Tube side - diagonal cross-brace in a downward direction.

Lower Structure:
location 1 - M0 bottom - from Beam Tube side across to the Clean Room side.
location 2 - R0 bottom - from Clean Room side across to the Beam Tube side.
location 3 - R0 side tapping on cross-brace just above the PUM from Clean Room to Beam Tube side
location 4 - M0 side tapping on cross-brace just above the PUM from Beam Tube to the Clean room side

Sleeve Structure:
location 1 - M0 bottom right corner of sleeve on the Beam Tube side
location 2 - R0 bottom right corner of sleeve on the Clean Room side
location 3 - M0 top left corner of sleeve on Clean room side
location 4 - R0 top right corner of sleeve on Clean room side
location 5 - diagonal cross brace on the Beam Tube side