K. Arai, J. Kissel

We have made an update of the h2susauxb478 model for better structuring and channel naming.
This model will be used for the monitoring of the OSEM outputs as well as the upcoming testing of
the dewhitening compensation filters

Details:

1) Repair symbolic links in /opt/rtcds/lho/h2/core/release/src/epics/simLink

h2seiitmy.mdl:
/opt/rtcds/lho/h2/cds_user_apps/trunk/cds/test/models/lho/h2seiitmy.mdl
-> /opt/rtcds/lho/h2/userapps/release/sei/h2/models/h2seiitmy.mdl

h2susauxb478.mdl:
/opt/rtcds/lho/h2/cds_user_apps/trunk/sus/h2/models/h2susauxb478.mdl
-> /opt/rtcds/lho/h2/userapps/release/sus/h2/models/h2susauxb478.mdl

2) Making Library parts for h2susauxb478 in /opt/rtcds/lho/h2/userapps/release/sus/common/models
OSEM_QUARTET_MONITOR_MASTER.mdl
OSEM_SEXTET_MONITOR_MASTER.mdl
QUAD_AUX_OSEM_TOPBLOCK_MONITOR_MASTER.mdl
QUAD_AUX_OSEM_UIMPUM_MONITOR_MASTER.mdl

3) Making symbolic link of the above libraries in /opt/rtcds/lho/h2/core/release/src/epics/simLink

4) Reorganization of the h2susauxb478 model
To have Channels with correct name convention (e.g. H2:SUS-ITMY_R0_NOISEMON_F3)
This modification has been done for ITMX/ITMY/BS/FMX/FMY

5) Submitted the model and the libraries to cds svn

 

Kyle, Gerardo 

3 of 3 new O-ring annulus joints passed pump down test (see recent X-mid alog entries). -> Began pumping X-mid with Turbo.  We will He leak test new conflat joints tomorrow.

Kyle, Gerardo - 

Vented Vertex and HAM6 volumes.  Venting very slow -> Discovered too large of a pressure drop across desicant tower after-filter.  Replaced filter element.  Filter was clogged with activated alumina powder from desicant.  Flow seemed normal for an hour or so then seemed to fall off again. -> Rechecked pressure drop across after-filter-normal. Replaced next downstream filter element (activated carbon element).  This filter didn't look clogged but replaced anyway -> No Help.  Flow seems to be restriced or excessive demand from LVEA.  Output 0.2 psi (normal is > 0.5 psi). -> Double checked point-of-use butterfly valves in LVEA and walked down Class 100 air heade.  Noted that receiver tank which supplies the drying tower stays in nominal 80 -120 psi range and that compressor duty cycle is normal.  In-chamber work taking place and don't want to shut off purge air at this time.  

Will continue trouble shooting when purge air can be shut-down.  

Additional FTIRs taken: upper fins, lower fins, and the ring. A dust monitor set for continuous sampling was set up in the chamber cleanroom.  BSC flooring was installed. Support tube bodies were inspected since fibers were spotted on the BSC-7 support tube bodies. The support tube bodies had fibers attached in various locations (most on the underside). A few pix are attached. The support tube nozzles and bellow were inspected. Debris was found in all nozzles. A couple of pix of these as well. Then, the support tubes were wrapped in two layers of foil, wrapped in C-3, and the C-3 was secured with Al foil strips. Dust barriers were placed in the beam tube nozzles. The compressor air lines were blown out prior to use and were found to have reddish watery residue. The wipes were taken to John for inspection and OK.(John was in meetings so we didn't turn an air drill in chamber today.)Equipment was staged by the dome so that documentation and conflat removal can start tomorrow.

- Door removed from HAM6. Purge air broke preventing entry to HAM5 and HAM6 simultaneously...waiting until completion of HAM6 entry for HAM5 work
- Delivery from North Cast Electric Company for Ken
- H2 PSL clean room Construction
- Lots of visitors and activity relating to ISI and SUS
- CherylV restored TCSY and the PID loop.  Intermittent alarms expected as temperature settles
- ICC in BSC8

- Door removed from HAM6. Purge air broke preventing entry to HAM5 and HAM6 simultaneously...waiting until completion of HAM6 entry for HAM5 work
- Delivery from North Cast Electric Company for Ken
- H2 PSL clean room Construction
- Lots of visitors and activity relating to ISI and SUS
- CherylV restored TCSY and the PID loop.  Intermittent alarms expected as temperature settles
- ICC in BSC8

GC wireless is available in the LVEA.  Dave and I installed an access point in the old squeezer laser safe area.  The setup is a little temporary, so I will be back in the next few days to shore up the access points mounting.

AC unit installed in the diode room, and penetrations were made in diode and chiller rooms. Clean room construction begins tomorrow!

R. Lane

Before everything was "fixed" (R0 side OSEM was still touching/rubbing) I ran a set of DTT TFs and then immediately ran a set of Matlab TFs for a comparison in performance/quality.

It appears that in general the performance/quality was rather good. DTT tended to have a bit more Q.

The main difference was time: conservatively ~4 hours/chain for Matlab and ~2.5 hours/chain for DTT.

J. Kissel, R. Lane

Further investigation of the Transverse Mode Bifurcation continued. We went back and plotted the data of previous TFs, zoomed in just a little bit, to see if the Bifurcation was a result of the cabling, or if it had always been there.

Looking at the plot of the Trans to Trans TF below, it is clear that the bifurcation has always been there.

After the Reaction Chain was cabled up Friday, August 12 (the UIM and PUM cables were routed down through the masses of the R0), we took another series of R0 TFs. Not all of the OSEMs have been connected to their respective cables.  The results look promising, but after reviewing the results with J. Kissel, we came up with a few comments:

The Pitch modes are stiffer (see page 5 of the all quads pdf), but seems to be similar to Brett's  T1000569  early results (primarily of interest is the peak that moved from 1.514Hz to 1.655 Hz).

The second Roll and second Trans modes have bifurcated. This could either be a physical change in the dynamics or it may be that the Q has increased such that the pendulum is swinging outside of the OSEM range, reducing the linear response. See page 2 and page 4 of the all quads pdf and 201108121552dtth2itmyr0rtf.pdf.

A few of the lower frequency modes are also a little bit stiffer. One peak of interest, is the little coupling peak between modes 3 and 4 of Longitudinal (moved from 1.498Hz to 1.639Hz).

The crew was split between working on Viton rims for the new dust dust barriers and working in and around BSC-8. At the BSC, the first activity of the day was adjusting the location of the garbing/staging cleanroom to preserve a pathway along the Y-arm/to the west bay.  The last view port was removed and pre-work FTIR (3) and wipe (3) samples were taken in the chamber. A designated cleanroom was set up for performing shed tests on C-3 covers (BSC/HAM door, support tube, etc.)that will be used in chamber. ~12 C-3 covers of various types were tested, rated, and re-packaged for later use. The outer coverings of the BSC flooring were removed in preparation for installation on Monday.

I posted a couple of pix below so everyone can appreciate the glories of this chamber surface. Note the variety of colors in the first picture and the writing on the surface in the second picture. 

1000 hrs. local 

CP5 dewar vapor pressure now 30 psig and heading toward normal.  Mechanical level gauge for CP5 in agreement with current CDS indicated level, 60-65% full. LLCV needle valve strokes normally with presence and absence of instrument air.  Oberserved needle %open in agreement with current CDS PID output %open -> Manipulated PID parameters to result in a PID output required to gain control of current CP5 level and returned control from manual to PID. Staged replacement part and tools needed to replace differential pressure transducer for CP5 but elected not to replace unit until work week.  Will monitor from home periodically until then.

GV15 annulus pump current now < 5 mA with ion pump + aux. pump cart pumping -> valved-out aux. pump cart

2055 received CP5 alarm -> Site overview from home PC indicated CP5 was 75% full, LLCV 98% and exhaust 1.7 psig -> Came onsite to investigate.  Indicated rate of change of pump level not consistent with maximum observed boil-off rate -> Probably level transducer failing. PID response to bogus low level was to overfill CP5

Also 
-> found CP5 dewar pressure relief circuit closed and over-pressure relief valve open and flowing GN2.  Regeneration line frosted indicating overfilling of CP5 (broken weld at ambient-air vaporizer allows reverse flow through this line to atmosphere, basically acting like a parallel exhaust line for pump when overfilled) -> I opened the pressure relief circuit (Praxair driver must have closed this and forgot to reopen during most recent CP5 delivery on July 27th).

I will replace transducer(s) tomorrow.  For now, I switched CP5 to manual control with LLCV @ 55% open.  



NOTE-Indicated CDS values for the pump may be intermittently bogus until transducer replacement.

Kyle, Gerardo 

(Late log entry, activity earlier in the week)

Installed O-ring type angle valves on (new/untested) 2 of 2 spool-spool annulus type O-ring joint pump ports.  Hung small turbo on valve and backed with aux. pump cart.  After ~20 hours of pumping, the pressure at the inlet of the aux. pump cart turbo was 5x10-6 torr in each case. 

New spool-to-GV15 flange annulus O-ring joint was pumped down with aux. pump cart then switched to ion pump.  Pressure increased slowly overnight and went off scale -> Valved-in aux. pump cart today and pressure now falling (7 mA at time of this entry).  Pump speed of aux. pump cart ~ = that of the ion pump implies ion pump can handle gas load unaided once pressure is below 5 mA. Once realized, new annulus joints at X-mid will be deemed okay and X-mid can be pumped down.

Crew finished painting the diode and chiller rooms today. They also cut out 4 panels into the LVEA plenum for supply air. HVAC guys did not show up today but they are due to show up on Monday. Feedthru penetrations will be cut into place on Monday.

[Thanks MichaelR for tagging in for the homestretch...]
- DennisC, DougC, EricJ, and JasonO in LVEA for IAS planning
- ICC in BSC8
- Cleaning and preparation for next week's HAM6 entry.
- H2PSL HVAC work on Diode Room by Rhodes
- BetsyB, JeffB, RobertL, FiliC by ISI and SUS test stands in LVEA for testing
- GregorioT by MY for OpLev testing
- StuartA, DanK, GregM, DanM work on new LDAS tape library and tour the LVEA with RobertS
- Farewell to PabloD, GregorioT, WalterO

R. Lane

Update to  Post 1205.

After looking at the model, the issue for the mysterious L2 (PUM) signals was a software error, not hardware. The ADC channel selectors in the model were updated to account for the ESD channels, and the L2 channels were not "fixed" at the same time as the other channels were. I corrected the model, committed the change to the SVN, and restarted the model. I also looked at the model for ITMX, it looked good. I did not find a final channel mapping for ETMY to see if it would include the same ESD channel mapping. The h2susbs model, does have some incorrect channel mapping, but I am not sure what they should be. The affected channels are OPLEV_SUM_IN, OPLEV_PITCH_IN, and OPLEV_YAW_IN. They will need to be fixed before they are used.