J. Kissel

Looking particularly bendy, I also B&K hammered the newly installed HAM2-ISI table baffles (D1700335). Pictures attached. Processed results to come.

Rakesh, Chandra and Arnab

We worked on the calibration issue we thought the pirani gauge had on BSC-2.The sensor head was tested using a 9-pin connector connected a MKS controller which showed a nearly correct value to atm adjustments. But when it was again connected with the original cable present with the 15-pin connector and it didn't go below  885 torr. Tthen we took the electronics off the sensor head put a different one, repeated the same but it didn't changed the value. The electronic unit was then taken off  as we had some doubt and wanted to check the calibration.After the testing we found that it worked fine an the voltage would changes equally on the o/p and would go below which was desired. With all this done we tried to check by changing the cable which didn't helped either. So now we doubt that there might be some offset issue on the ADC channel with the beckhoff which didn't allow us adjust the atm, to go below 5.6V(nearly corresponds to 880 torr) when adjusted and measured at atm.  

J. Kissel

Checking the change in cage resonances (and security of the baffles), I hammered the PR3 Cage and the front-face of the upper baffle of the collection of Venetian baffles (see D1700239) added to PR3. Pictures attached. Processed results to follow.

J. Kissel

While in HAM2 finishing up the IM B&K hammering, I took some similar transfer functions of the PSL to MC1 Down Periscope (D0901093), because I noticed that it was of particularly high Q when I dinked it with a 3/32 hex key. Pictures attached, results to be process and posted later.

J. Kissel

We figured we'd close out the successful week of H1 SUS ITMX re-installation by checking the overall health / freedom of the suspension with the usual top-to-top transfer functions for both M0 and R0. Sadly, we wasted our luck on detection a loud binary neutron star collision a few months ago. The Main Chain shows evidence of interference with the reaction chain, or some otherwise subtle rubbing in the middle stages. The reaction chain is virtually locked up. I won't both posting the full detailed results, but I do attach some DTT sample degrees of freedom. The BLACK traces are the reference from the former suspension, in vacuum, back in July. The RED traces are the current response.

This is by no means un-expected, nor is it a show stopper. We still have to *at least*
   - Re-align the reaction chain to the *correct* spots (see LHO aLOG 39109) 
   - Align / center the UIM flags / OSEMs
   - Re-align / center the PUM flags / OSEMs
   - Measure main-chain violin modes, then remove that temporary infrastructure
which all require gross mechanical work that will change the rubbing situation.

We'll slowly begin to address this all next week.

WP7184

After the raw minute trend files had been copied to h1fw1 and verified, I restarted h1nds1 daqd this afternoon to use the new location of these files. I then deleted the old copy from h1tw1's SSD-RAID, which brought its disk usage down from 92% to 9%. This completes WP7184.

TITLE: 10/20 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:

16:26 Untripped ETMY ISI

17:19 Travis headed out to ITMX

17:45 Peter out of optics lab

18:19 Jeff K out to HAM2 to continue B&K hammering. Then to visit Travis at ITMX.

18:56 Travis out for lunch

20:02 Travis back out to biergarten

20:21 Cheryl out to HAM2

20:58 Travis out for the day

21:05 Jeff back for the day

J. Kissel, T. Sadecki

We setup the equipment in-chamber for measuring the fully suspended violin modes.  We are currently setup on the +X/+Y fiber and a preliminary look at the spectra looks good.  Jeff will proceed with getting the full set of data on Monday as he is going to run some health check TFs before proceeding further.

J. Kissel

I've taken an over-night (un-driven) ASD of the recently aligned L2/PUM OSEMs on the newly freely suspended H1 SUS ITMX, on the hunt for its new highest Bounce and Roll (a.k.a. the V4 and R4) modes. Attached are the results, which clearly show these modes, and they're well resolved in frequency with high SNR. The following are these frequencies in tabular form:
     
    Former values (Hz)       New Values (Hz)
V4     9.8469                        9.8022
R4    13.978                        13.927

We'll use these new frequencies to tune up the Bounce & Roll mode dampers that are to be installed in a bit.

TITLE: 10/20 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 6mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.68 μm/s
QUICK SUMMARY:

Subbing in for Cheryl. High winds overnight have calmed. uSeiesm has leveled off just above te 90th 5ile line with EQ bands sympathizing with the elevated motion.

J. Kissel quoting J. Warner

"MC baffles were assembled last night, I dogged them this morning as well as the ballast mass baffle. TJ reinstalled PR3 lower baffle after TCS work was done and beard baffles were done last week. The only outstanding HAM2 baffles are PRM, which is waiting for parts, and table baffles that will probably be in the way of everyone else, but will only take minutes to install."

I post a few pictures I caught of him during the install. Jim's got a few more on his phone that he may post later.

J. Kissel, T. Sadecki

Today, we adjusted the pointing of the ITMx TM to get the OpLev beam out of the receiver viewport that houses the OpLev PD.  We then aligned the reaction chain such that the CP HR reflection overlaps with the TM AR reflection, thus ensuring parallelism of the inner surfaces at the TM level.  We did not check the 20mm spacing between the chains as time was running short for the day, so we'll have to re-assess that at a later time.  This was mostly a check that we had range in the pitch and yaw adjustment to get us where we need to be.  We did, but just barely, as we used up most of the four main chain fine pitch adjuster ranges to get us there.  We then reinstalled and centered the top mass BOSEMs for both chains and the PUM AOSEMs.  We did not bother with the most fussy, UIM level BOSEMs as Jeff noted that for the bounce/roll mode measurements we need to tune BRDs, the PUM OSEMs will suffice.  Next up: run TF measurements to check for overall health/rubbing, take bounce/roll measurements for BRD tuning, and set up for the final round of fully suspended violin mode measurements.

J. Kissel

Following the same sensor locations and hammer hits as in LHO aLOG 5652, I've B&K hammered IM1 and IM3. Attached are pictures. IM1 are the first three. The next two are IM3. 

I must give props to Cheryl for the design and installation of the breadboard leaner plate -- I used it extensively to hammer IM3. I attach some pictures at the tail end for those who haven't see it. (It's also the reason why the MC bypass is no longer in place.)

Processed results and comparisons with previous results will come in due time.